Merge pull request #18 from tulir/ui-refactor

Refactor UI to use interfaces and add advanced message rendering

config/config.go

@@ -23,7 +23,7 @@ import (
 	"path/filepath"
 
 	"gopkg.in/yaml.v2"
-	"maunium.net/go/gomuks/ui/debug"
+	"maunium.net/go/gomuks/debug"
 )
 
 // Config contains the main config of gomuks.
@@ -33,6 +33,7 @@ type Config struct {
 
 	Dir        string   `yaml:"-"`
 	HistoryDir string   `yaml:"history_dir"`
+	MediaDir   string   `yaml:"media_dir"`
 	Session    *Session `yaml:"-"`
 }
 
@@ -41,6 +42,7 @@ func NewConfig(dir string) *Config {
 	return &Config{
 		Dir:        dir,
 		HistoryDir: filepath.Join(dir, "history"),
+		MediaDir:   filepath.Join(dir, "media"),
 	}
 }
 

config/session.go

@@ -24,7 +24,7 @@ import (
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/debug"
+	"maunium.net/go/gomuks/debug"
 )
 
 type Session struct {

debug/debug.go

@@ -17,105 +17,45 @@
 package debug
 
 import (
+	"bytes"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"time"
 
 	"runtime/debug"
 
-	"maunium.net/go/tview"
 )
 
-type Printer interface {
+var writer io.Writer
-	Printf(text string, args ...interface{})
+
-	Print(text ...interface{})
+func init() {
+	var err error
+	writer, err = os.OpenFile("/tmp/gomuks-debug.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
+	if err != nil {
+		writer = nil
 	}
-
-type Pane struct {
-	*tview.TextView
-	Height int
-	Width  int
-	num    int
-}
-
-var Default Printer
-var RedirectAllExt bool
-
-func NewPane() *Pane {
-	pane := tview.NewTextView()
-	pane.
-		SetScrollable(true).
-		SetWrap(true).
-		SetBorder(true).
-		SetTitle("Debug output")
-	fmt.Fprintln(pane, "[0] Debug pane initialized")
-
-	return &Pane{
-		TextView: pane,
-		Height:   35,
-		Width:    80,
-		num:      0,
-	}
-}
-
-func (db *Pane) Printf(text string, args ...interface{}) {
-	db.WriteString(fmt.Sprintf(text, args...) + "\n")
-}
-
-func (db *Pane) Print(text ...interface{}) {
-	db.WriteString(fmt.Sprintln(text...))
-}
-
-func (db *Pane) WriteString(text string) {
-	db.num++
-	fmt.Fprintf(db, "[%d] %s", db.num, text)
-}
-
-type PaneSide int
-
-const (
-	Top PaneSide = iota
-	Bottom
-	Left
-	Right
-)
-
-func (db *Pane) Wrap(main tview.Primitive, side PaneSide) tview.Primitive {
-	rows, columns := []int{0}, []int{0}
-	mainRow, mainColumn, paneRow, paneColumn := 0, 0, 0, 0
-	switch side {
-	case Top:
-		rows = []int{db.Height, 0}
-		mainRow = 1
-	case Bottom:
-		rows = []int{0, db.Height}
-		paneRow = 1
-	case Left:
-		columns = []int{db.Width, 0}
-		mainColumn = 1
-	case Right:
-		columns = []int{0, db.Width}
-		paneColumn = 1
-	}
-	return tview.NewGrid().SetRows(rows...).SetColumns(columns...).
-		AddItem(main, mainRow, mainColumn, 1, 1, 1, 1, true).
-		AddItem(db, paneRow, paneColumn, 1, 1, 1, 1, false)
 }
 
 func Printf(text string, args ...interface{}) {
-	if RedirectAllExt {
+	if writer != nil {
-		ExtPrintf(text, args...)
+		fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
-	} else if Default != nil {
+		fmt.Fprintf(writer, text+"\n", args...)
-		Default.Printf(text, args...)
 	}
 }
 
 func Print(text ...interface{}) {
-	if RedirectAllExt {
+	if writer != nil {
-		ExtPrint(text...)
+		fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
-	} else if Default != nil {
+		fmt.Fprintln(writer, text...)
-		Default.Print(text...)
+	}
+}
+
+func PrintStack() {
+	if writer != nil {
+		data := debug.Stack()
+		writer.Write(data)
 	}
 }
 
@@ -128,14 +68,18 @@ const Oops = ` __________
           U  ||----W |
              ||     ||`
 
-func PrettyPanic() {
+func PrettyPanic(panic interface{}) {
 	fmt.Println(Oops)
 	fmt.Println("")
 	fmt.Println("A fatal error has occurred.")
 	fmt.Println("")
 	traceFile := fmt.Sprintf("/tmp/gomuks-panic-%s.txt", time.Now().Format("2006-01-02--15-04-05"))
-	data := debug.Stack()
+
-	err := ioutil.WriteFile(traceFile, data, 0644)
+	var buf bytes.Buffer
+	fmt.Fprintln(&buf, panic)
+	buf.Write(debug.Stack())
+	err := ioutil.WriteFile(traceFile, buf.Bytes(), 0644)
+
 	if err != nil {
 		fmt.Println("Saving the stack trace to", traceFile, "failed:")
 		fmt.Println("--------------------------------------------------------------------------------")
@@ -146,6 +90,7 @@ func PrettyPanic() {
 		fmt.Println("Please provide the file save error (above) and the stack trace of the original error (below) when filing an issue.")
 		fmt.Println("")
 		fmt.Println("--------------------------------------------------------------------------------")
+		fmt.Println(panic)
 		debug.PrintStack()
 		fmt.Println("--------------------------------------------------------------------------------")
 	} else {

debug/doc.go

@@ -0,0 +1,2 @@
+// Package debug contains utilities to log debug messages and display panics nicely.
+package debug

gomuks.go

@@ -23,10 +23,10 @@ import (
 	"time"
 
 	"maunium.net/go/gomuks/config"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/gomuks/matrix"
 	"maunium.net/go/gomuks/ui"
-	"maunium.net/go/gomuks/ui/debug"
 	"maunium.net/go/tview"
 )
 
@@ -35,7 +35,6 @@ type Gomuks struct {
 	app       *tview.Application
 	ui        *ui.GomuksUI
 	matrix    *matrix.Container
-	debug     *debug.Pane
 	debugMode bool
 	config    *config.Config
 	stop      chan bool
@@ -43,19 +42,14 @@ type Gomuks struct {
 
 // NewGomuks creates a new Gomuks instance with everything initialized,
 // but does not start it.
-func NewGomuks(enableDebug, forceExternalDebug bool) *Gomuks {
+func NewGomuks(enableDebug bool) *Gomuks {
 	configDir := filepath.Join(os.Getenv("HOME"), ".config/gomuks")
 	gmx := &Gomuks{
 		app:       tview.NewApplication(),
 		stop:      make(chan bool, 1),
+		debugMode: enableDebug,
 	}
 
-	gmx.debug = debug.NewPane()
-	gmx.debug.SetChangedFunc(func() {
-		gmx.ui.Render()
-	})
-	debug.Default = gmx.debug
-
 	gmx.config = config.NewConfig(configDir)
 	gmx.ui = ui.NewGomuksUI(gmx)
 	gmx.matrix = matrix.NewContainer(gmx)
@@ -68,15 +62,6 @@ func NewGomuks(enableDebug, forceExternalDebug bool) *Gomuks {
 	_ = gmx.matrix.InitClient()
 
 	main := gmx.ui.InitViews()
-	if enableDebug {
-		debug.EnableExternal()
-		if forceExternalDebug {
-			debug.RedirectAllExt = true
-		} else {
-			main = gmx.debug.Wrap(main, debug.Right)
-		}
-		gmx.debugMode = true
-	}
 	gmx.app.SetRoot(main, true)
 
 	return gmx
@@ -85,10 +70,10 @@ func NewGomuks(enableDebug, forceExternalDebug bool) *Gomuks {
 // Save saves the active session and message history.
 func (gmx *Gomuks) Save() {
 	if gmx.config.Session != nil {
-		gmx.debug.Print("Saving session...")
+		debug.Print("Saving session...")
 		_ = gmx.config.Session.Save()
 	}
-	gmx.debug.Print("Saving history...")
+	debug.Print("Saving history...")
 	gmx.ui.MainView().SaveAllHistory()
 }
 
@@ -112,9 +97,9 @@ func (gmx *Gomuks) StartAutosave() {
 // Stop stops the Matrix syncer, the tview app and the autosave goroutine,
 // then saves everything and calls os.Exit(0).
 func (gmx *Gomuks) Stop() {
-	gmx.debug.Print("Disconnecting from Matrix...")
+	debug.Print("Disconnecting from Matrix...")
 	gmx.matrix.Stop()
-	gmx.debug.Print("Cleaning up UI...")
+	debug.Print("Cleaning up UI...")
 	gmx.app.Stop()
 	gmx.stop <- true
 	gmx.Save()
@@ -132,7 +117,7 @@ func (gmx *Gomuks) Recover() {
 		if gmx.debugMode {
 			panic(p)
 		} else {
-			debug.PrettyPanic()
+			debug.PrettyPanic(p)
 		}
 	}
 }
@@ -170,8 +155,8 @@ func (gmx *Gomuks) UI() ifc.GomuksUI {
 }
 
 func main() {
-	debugVar := os.Getenv("DEBUG")
+	enableDebug := len(os.Getenv("DEBUG")) > 0
-	NewGomuks(len(debugVar) > 0, debugVar == "ext").Start()
+	NewGomuks(enableDebug).Start()
 
 	// We use os.Exit() everywhere, so exiting by returning from Start() shouldn't happen.
 	time.Sleep(5 * time.Second)

interface/matrix.go

@@ -34,4 +34,6 @@ type MatrixContainer interface {
 	LeaveRoom(roomID string) error
 	GetHistory(roomID, prevBatch string, limit int) ([]gomatrix.Event, string, error)
 	GetRoom(roomID string) *rooms.Room
+	Download(mxcURL string) ([]byte, string, string, error)
+	GetCachePath(homeserver, fileID string) string
 }

interface/ui.go

@@ -17,11 +17,12 @@
 package ifc
 
 import (
+	"time"
+
+	"maunium.net/go/tcell"
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/types"
-	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -42,7 +43,7 @@ type GomuksUI interface {
 }
 
 type MainView interface {
-	GetRoom(roomID string) *widget.RoomView
+	GetRoom(roomID string) RoomView
 	HasRoom(roomID string) bool
 	AddRoom(roomID string)
 	RemoveRoom(roomID string)
@@ -50,11 +51,76 @@ type MainView interface {
 	SaveAllHistory()
 
 	SetTyping(roomID string, users []string)
-	AddServiceMessage(roomID *widget.RoomView, message string)
+	ParseEvent(roomView RoomView, evt *gomatrix.Event) Message
-	ProcessMessageEvent(roomView *widget.RoomView, evt *gomatrix.Event) *types.Message
+	//ProcessMessageEvent(roomView RoomView, evt *gomatrix.Event) Message
-	ProcessMembershipEvent(roomView *widget.RoomView, evt *gomatrix.Event) *types.Message
+	//ProcessMembershipEvent(roomView RoomView, evt *gomatrix.Event) Message
-	NotifyMessage(room *rooms.Room, message *types.Message, should pushrules.PushActionArrayShould)
+	NotifyMessage(room *rooms.Room, message Message, should pushrules.PushActionArrayShould)
 }
 
 type LoginView interface {
 }
+
+type MessageDirection int
+
+const (
+	AppendMessage  MessageDirection = iota
+	PrependMessage
+	IgnoreMessage
+)
+
+type RoomView interface {
+	MxRoom() *rooms.Room
+	SaveHistory(dir string) error
+	LoadHistory(gmx Gomuks, dir string) (int, error)
+
+	SetStatus(status string)
+	SetTyping(users []string)
+	UpdateUserList()
+
+	NewMessage(id, sender, msgtype, text string, timestamp time.Time) Message
+	NewTempMessage(msgtype, text string) Message
+	AddMessage(message Message, direction MessageDirection)
+	AddServiceMessage(message string)
+}
+
+type MessageMeta interface {
+	Sender() string
+	SenderColor() tcell.Color
+	TextColor() tcell.Color
+	TimestampColor() tcell.Color
+	Timestamp() time.Time
+	FormatTime() string
+	FormatDate() string
+	CopyFrom(from MessageMeta)
+}
+
+// MessageState is an enum to specify if a Message is being sent, failed to send or was successfully sent.
+type MessageState int
+
+// Allowed MessageStates.
+const (
+	MessageStateSending MessageState = iota
+	MessageStateDefault
+	MessageStateFailed
+)
+
+type Message interface {
+	MessageMeta
+
+	SetIsHighlight(isHighlight bool)
+	IsHighlight() bool
+
+	SetIsService(isService bool)
+	IsService() bool
+
+	SetID(id string)
+	ID() string
+
+	SetType(msgtype string)
+	Type() string
+
+	NotificationContent() string
+
+	SetState(state MessageState)
+	State() MessageState
+}

lib/ansimage/LICENSE

@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

lib/ansimage/ansimage.go

@@ -0,0 +1,287 @@
+//       ___  _____  ____
+//      / _ \/  _/ |/_/ /____ ______ _
+//     / ___// /_>  </ __/ -_) __/  ' \
+//    /_/  /___/_/|_|\__/\__/_/ /_/_/_/
+//
+//    Copyright 2017 Eliuk Blau
+//
+//    This Source Code Form is subject to the terms of the Mozilla Public
+//    License, v. 2.0. If a copy of the MPL was not distributed with this
+//    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package ansimage
+
+import (
+	"errors"
+	"image"
+	"image/color"
+	"image/draw"
+	_ "image/gif"  // initialize decoder
+	_ "image/jpeg" // initialize decoder
+	_ "image/png"  // initialize decoder
+	"io"
+	"os"
+
+	"github.com/disintegration/imaging"
+	_ "golang.org/x/image/bmp"  // initialize decoder
+	_ "golang.org/x/image/tiff" // initialize decoder
+	_ "golang.org/x/image/webp" // initialize decoder
+	"maunium.net/go/gomuks/ui/messages/tstring"
+	"maunium.net/go/tcell"
+)
+
+var (
+	// ErrHeightNonMoT happens when ANSImage height is not a Multiple of Two value.
+	ErrHeightNonMoT = errors.New("ANSImage: height must be a Multiple of Two value")
+
+	// ErrInvalidBoundsMoT happens when ANSImage height or width are invalid values (Multiple of Two).
+	ErrInvalidBoundsMoT = errors.New("ANSImage: height or width must be >=2")
+
+	// ErrOutOfBounds happens when ANSI-pixel coordinates are out of ANSImage bounds.
+	ErrOutOfBounds = errors.New("ANSImage: out of bounds")
+)
+
+// ANSIpixel represents a pixel of an ANSImage.
+type ANSIpixel struct {
+	Brightness uint8
+	R, G, B    uint8
+	upper      bool
+	source     *ANSImage
+}
+
+// ANSImage represents an image encoded in ANSI escape codes.
+type ANSImage struct {
+	h, w     int
+	maxprocs int
+	bgR      uint8
+	bgG      uint8
+	bgB      uint8
+	pixmap   [][]*ANSIpixel
+}
+
+func (ai *ANSImage) Pixmap() [][]*ANSIpixel {
+	return ai.pixmap
+}
+
+// Height gets total rows of ANSImage.
+func (ai *ANSImage) Height() int {
+	return ai.h
+}
+
+// Width gets total columns of ANSImage.
+func (ai *ANSImage) Width() int {
+	return ai.w
+}
+
+// SetMaxProcs sets the maximum number of parallel goroutines to render the ANSImage
+// (user should manually sets `runtime.GOMAXPROCS(max)` before to this change takes effect).
+func (ai *ANSImage) SetMaxProcs(max int) {
+	ai.maxprocs = max
+}
+
+// GetMaxProcs gets the maximum number of parallels goroutines to render the ANSImage.
+func (ai *ANSImage) GetMaxProcs() int {
+	return ai.maxprocs
+}
+
+// SetAt sets ANSI-pixel color (RBG) and brightness in coordinates (y,x).
+func (ai *ANSImage) SetAt(y, x int, r, g, b, brightness uint8) error {
+	if y >= 0 && y < ai.h && x >= 0 && x < ai.w {
+		ai.pixmap[y][x].R = r
+		ai.pixmap[y][x].G = g
+		ai.pixmap[y][x].B = b
+		ai.pixmap[y][x].Brightness = brightness
+		ai.pixmap[y][x].upper = y%2 == 0
+		return nil
+	}
+	return ErrOutOfBounds
+}
+
+// GetAt gets ANSI-pixel in coordinates (y,x).
+func (ai *ANSImage) GetAt(y, x int) (*ANSIpixel, error) {
+	if y >= 0 && y < ai.h && x >= 0 && x < ai.w {
+		return &ANSIpixel{
+			R:          ai.pixmap[y][x].R,
+			G:          ai.pixmap[y][x].G,
+			B:          ai.pixmap[y][x].B,
+			Brightness: ai.pixmap[y][x].Brightness,
+			upper:      ai.pixmap[y][x].upper,
+			source:     ai.pixmap[y][x].source,
+		},
+			nil
+	}
+	return nil, ErrOutOfBounds
+}
+
+// Render returns the ANSI-compatible string form of ANSImage.
+// (Nice info for ANSI True Colour - https://gist.github.com/XVilka/8346728)
+func (ai *ANSImage) Render() []tstring.TString {
+	type renderData struct {
+		row    int
+		render tstring.TString
+	}
+
+	rows := make([]tstring.TString, ai.h/2)
+	for y := 0; y < ai.h; y += ai.maxprocs {
+		ch := make(chan renderData, ai.maxprocs)
+		for n, row := 0, y; (n <= ai.maxprocs) && (2*row+1 < ai.h); n, row = n+1, y+n {
+			go func(row, y int) {
+				str := make(tstring.TString, ai.w)
+				for x := 0; x < ai.w; x++ {
+					topPixel := ai.pixmap[y][x]
+					topColor := tcell.NewRGBColor(int32(topPixel.R), int32(topPixel.G), int32(topPixel.B))
+
+					bottomPixel := ai.pixmap[y+1][x]
+					bottomColor := tcell.NewRGBColor(int32(bottomPixel.R), int32(bottomPixel.G), int32(bottomPixel.B))
+
+					str[x] = tstring.Cell{
+						Char:  '▄',
+						Style: tcell.StyleDefault.Background(topColor).Foreground(bottomColor),
+					}
+				}
+				ch <- renderData{row: row, render: str}
+			}(row, 2*row)
+		}
+		for n, row := 0, y; (n <= ai.maxprocs) && (2*row+1 < ai.h); n, row = n+1, y+n {
+			data := <-ch
+			rows[data.row] = data.render
+		}
+	}
+	return rows
+}
+
+// New creates a new empty ANSImage ready to draw on it.
+func New(h, w int, bg color.Color) (*ANSImage, error) {
+	if h%2 != 0 {
+		return nil, ErrHeightNonMoT
+	}
+
+	if h < 2 || w < 2 {
+		return nil, ErrInvalidBoundsMoT
+	}
+
+	r, g, b, _ := bg.RGBA()
+	ansimage := &ANSImage{
+		h:        h, w: w,
+		maxprocs: 1,
+		bgR:      uint8(r),
+		bgG:      uint8(g),
+		bgB:      uint8(b),
+		pixmap:   nil,
+	}
+
+	ansimage.pixmap = func() [][]*ANSIpixel {
+		v := make([][]*ANSIpixel, h)
+		for y := 0; y < h; y++ {
+			v[y] = make([]*ANSIpixel, w)
+			for x := 0; x < w; x++ {
+				v[y][x] = &ANSIpixel{
+					R:          0,
+					G:          0,
+					B:          0,
+					Brightness: 0,
+					source:     ansimage,
+					upper:      y%2 == 0,
+				}
+			}
+		}
+		return v
+	}()
+
+	return ansimage, nil
+}
+
+// NewFromReader creates a new ANSImage from an io.Reader.
+// Background color is used to fill when image has transparency or dithering mode is enabled
+// Dithering mode is used to specify the way that ANSImage render ANSI-pixels (char/block elements).
+func NewFromReader(reader io.Reader, bg color.Color) (*ANSImage, error) {
+	img, _, err := image.Decode(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	return createANSImage(img, bg)
+}
+
+// NewScaledFromReader creates a new scaled ANSImage from an io.Reader.
+// Background color is used to fill when image has transparency or dithering mode is enabled
+// Dithering mode is used to specify the way that ANSImage render ANSI-pixels (char/block elements).
+func NewScaledFromReader(reader io.Reader, y, x int, bg color.Color) (*ANSImage, error) {
+	img, _, err := image.Decode(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	img = imaging.Resize(img, x, y, imaging.Lanczos)
+
+	return createANSImage(img, bg)
+}
+
+// NewFromFile creates a new ANSImage from a file.
+// Background color is used to fill when image has transparency or dithering mode is enabled
+// Dithering mode is used to specify the way that ANSImage render ANSI-pixels (char/block elements).
+func NewFromFile(name string, bg color.Color) (*ANSImage, error) {
+	reader, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	return NewFromReader(reader, bg)
+}
+
+// NewScaledFromFile creates a new scaled ANSImage from a file.
+// Background color is used to fill when image has transparency or dithering mode is enabled
+// Dithering mode is used to specify the way that ANSImage render ANSI-pixels (char/block elements).
+func NewScaledFromFile(name string, y, x int, bg color.Color) (*ANSImage, error) {
+	reader, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	return NewScaledFromReader(reader, y, x, bg)
+}
+
+// createANSImage loads data from an image and returns an ANSImage.
+// Background color is used to fill when image has transparency or dithering mode is enabled
+// Dithering mode is used to specify the way that ANSImage render ANSI-pixels (char/block elements).
+func createANSImage(img image.Image, bg color.Color) (*ANSImage, error) {
+	var rgbaOut *image.RGBA
+	bounds := img.Bounds()
+
+	// do compositing only if background color has no transparency (thank you @disq for the idea!)
+	// (info - http://stackoverflow.com/questions/36595687/transparent-pixel-color-go-lang-image)
+	if _, _, _, a := bg.RGBA(); a >= 0xffff {
+		rgbaOut = image.NewRGBA(bounds)
+		draw.Draw(rgbaOut, bounds, image.NewUniform(bg), image.ZP, draw.Src)
+		draw.Draw(rgbaOut, bounds, img, image.ZP, draw.Over)
+	} else {
+		if v, ok := img.(*image.RGBA); ok {
+			rgbaOut = v
+		} else {
+			rgbaOut = image.NewRGBA(bounds)
+			draw.Draw(rgbaOut, bounds, img, image.ZP, draw.Src)
+		}
+	}
+
+	yMin, xMin := bounds.Min.Y, bounds.Min.X
+	yMax, xMax := bounds.Max.Y, bounds.Max.X
+
+	// always sets an even number of ANSIPixel rows...
+	yMax = yMax - yMax%2 // one for upper pixel and another for lower pixel --> without dithering
+
+	ansimage, err := New(yMax, xMax, bg)
+	if err != nil {
+		return nil, err
+	}
+
+	for y := yMin; y < yMax; y++ {
+		for x := xMin; x < xMax; x++ {
+			v := rgbaOut.RGBAAt(x, y)
+			if err := ansimage.SetAt(y, x, v.R, v.G, v.B, 0); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return ansimage, nil
+}

lib/ansimage/doc.go

@@ -0,0 +1,12 @@
+// Package ansimage is a simplified version of the ansimage package
+// in https://github.com/eliukblau/pixterm focused in rendering images
+// to a tcell-based TUI app.
+//
+//       ___  _____  ____
+//      / _ \/  _/ |/_/ /____ ______ _
+//     / ___// /_>  </ __/ -_) __/  ' \
+//    /_/  /___/_/|_|\__/\__/_/ /_/_/_/
+//
+// This package is licensed under the Mozilla Public License v2.0.
+package ansimage
+

lib/htmlparser/doc.go

@@ -0,0 +1,3 @@
+// Package htmlparser contains a HTML parsing system similar to html.parser.HTMLParser in Python 3.
+// The parser uses x/net/html.Tokenizer in the background.
+package htmlparser

lib/htmlparser/htmlparser.go

@@ -0,0 +1,142 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package htmlparser
+
+import (
+	"io"
+	"strings"
+
+	"golang.org/x/net/html"
+)
+
+// HTMLProcessor contains the functions to process parsed HTML data.
+type HTMLProcessor interface {
+	// Preprocess is called before the parsing is started.
+	Preprocess()
+
+	// HandleStartTag is called with the tag name and attributes when
+	// the parser encounters a StartTagToken, except if the tag is
+	// always self-closing.
+	HandleStartTag(tagName string, attrs map[string]string)
+	// HandleSelfClosingTag is called with the tag name and attributes
+	// when the parser encounters a SelfClosingTagToken OR a StartTagToken
+	// with a tag that's always self-closing.
+	HandleSelfClosingTag(tagName string, attrs map[string]string)
+	// HandleText is called with the text when the parser encounters
+	// a TextToken.
+	HandleText(text string)
+	// HandleEndTag is called with the tag name when the parser encounters
+	// an EndTagToken.
+	HandleEndTag(tagName string)
+
+	// ReceiveError is called with the error when the parser encounters
+	// an ErrorToken that IS NOT io.EOF.
+	ReceiveError(err error)
+
+	// Postprocess is called after parsing is completed successfully.
+	// An unsuccessful parsing will trigger a ReceiveError() call.
+	Postprocess()
+}
+
+// HTMLParser wraps a net/html.Tokenizer and a HTMLProcessor to call
+// the HTMLProcessor with data from the Tokenizer.
+type HTMLParser struct {
+	*html.Tokenizer
+	processor HTMLProcessor
+}
+
+// NewHTMLParserFromTokenizer creates a new HTMLParser from an existing html Tokenizer.
+func NewHTMLParserFromTokenizer(z *html.Tokenizer, processor HTMLProcessor) HTMLParser {
+	return HTMLParser{
+		z,
+		processor,
+	}
+}
+
+// NewHTMLParserFromReader creates a Tokenizer with the given io.Reader and
+// then uses that to create a new HTMLParser.
+func NewHTMLParserFromReader(reader io.Reader, processor HTMLProcessor) HTMLParser {
+	return NewHTMLParserFromTokenizer(html.NewTokenizer(reader), processor)
+}
+
+// NewHTMLParserFromString creates a Tokenizer with a reader of the given
+// string and then uses that to create a new HTMLParser.
+func NewHTMLParserFromString(html string, processor HTMLProcessor) HTMLParser {
+	return NewHTMLParserFromReader(strings.NewReader(html), processor)
+}
+
+// SelfClosingTags is the list of tags that always call
+// HTMLProcessor.HandleSelfClosingTag() even if it is encountered
+// as a html.StartTagToken rather than html.SelfClosingTagToken.
+var SelfClosingTags = []string{"img", "br", "hr", "area", "base", "basefont", "input", "link", "meta"}
+
+func (parser HTMLParser) mapAttrs() map[string]string {
+	attrs := make(map[string]string)
+	hasMore := true
+	for hasMore {
+		var key, val []byte
+		key, val, hasMore = parser.TagAttr()
+		attrs[string(key)] = string(val)
+	}
+	return attrs
+}
+
+func (parser HTMLParser) isSelfClosing(tag string) bool {
+	for _, selfClosingTag := range SelfClosingTags {
+		if tag == selfClosingTag {
+			return true
+		}
+	}
+	return false
+}
+
+// Process parses the HTML using the tokenizer in this parser and
+// calls the appropriate functions of the HTML processor.
+func (parser HTMLParser) Process() {
+	parser.processor.Preprocess()
+Loop:
+	for {
+		tt := parser.Next()
+		switch tt {
+		case html.ErrorToken:
+			if parser.Err() != io.EOF {
+				parser.processor.ReceiveError(parser.Err())
+				return
+			}
+			break Loop
+		case html.TextToken:
+			parser.processor.HandleText(string(parser.Text()))
+		case html.StartTagToken, html.SelfClosingTagToken:
+			tagb, _ := parser.TagName()
+			attrs := parser.mapAttrs()
+			tag := string(tagb)
+
+			selfClosing := tt == html.SelfClosingTagToken || parser.isSelfClosing(tag)
+
+			if selfClosing {
+				parser.processor.HandleSelfClosingTag(tag, attrs)
+			} else {
+				parser.processor.HandleStartTag(tag, attrs)
+			}
+		case html.EndTagToken:
+			tagb, _ := parser.TagName()
+			parser.processor.HandleEndTag(string(tagb))
+		}
+	}
+
+	parser.processor.Postprocess()
+}

lib/open/doc.go

@@ -0,0 +1,4 @@
+// Package open contains a simple cross-platform way to open files in the program the OS wants to use.
+//
+// Based on https://github.com/skratchdot/open-golang
+package open

lib/open/open.go

@@ -0,0 +1,27 @@
+// +build !windows,!darwin
+
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package open
+
+import (
+	"os/exec"
+)
+
+func Open(input string) error {
+	return exec.Command("xdg-open", input).Start()
+}

lib/open/open_darwin.go

@@ -0,0 +1,25 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package open
+
+import (
+	"os/exec"
+)
+
+func Open(input string) error {
+	return exec.Command("open", input).Start()
+}

lib/open/open_windows.go

@@ -14,32 +14,16 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package debug
+package open
 
 import (
-	"fmt"
+	"os/exec"
-	"io"
-	"os"
 )
 
-var writer io.Writer
+const FileProtocolHandler = "url.dll,FileProtocolHandler"
 
-func EnableExternal() {
+var RunDLL32 = filepath.Join(os.Getenv("SYSTEMROOT"), "System32", "rundll32.exe")
-	var err error
-	writer, err = os.OpenFile("/tmp/gomuks-debug.log", os.O_WRONLY|os.O_APPEND, 0644)
-	if err != nil {
-		writer = nil
-	}
-}
 
-func ExtPrintf(text string, args ...interface{}) {
+func Open(input string) error {
-	if writer != nil {
+	return exec.Command(RunDLL32, FileProtocolHandler, input).Start()
-		fmt.Fprintf(writer, text+"\n", args...)
-	}
-}
-
-func ExtPrint(text ...interface{}) {
-	if writer != nil {
-		fmt.Fprintln(writer, text...)
-	}
 }

matrix/matrix.go

@@ -17,18 +17,26 @@
 package matrix
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
 	"strings"
 	"time"
 
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/config"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/debug"
-	"maunium.net/go/gomuks/ui/widget"
 )
 
 // Container is a wrapper for a gomatrix Client and some other stuff.
@@ -221,13 +229,13 @@ func (c *Container) HandleMessage(evt *gomatrix.Event) {
 		return
 	}
 
-	message := mainView.ProcessMessageEvent(roomView, evt)
+	message := mainView.ParseEvent(roomView, evt)
 	if message != nil {
 		if c.syncer.FirstSyncDone {
-			pushRules := c.PushRules().GetActions(roomView.Room, evt).Should()
+			pushRules := c.PushRules().GetActions(roomView.MxRoom(), evt).Should()
-			mainView.NotifyMessage(roomView.Room, message, pushRules)
+			mainView.NotifyMessage(roomView.MxRoom(), message, pushRules)
 		}
-		roomView.AddMessage(message, widget.AppendMessage)
+		roomView.AddMessage(message, ifc.AppendMessage)
 		c.ui.Render()
 	}
 }
@@ -255,8 +263,7 @@ func (c *Container) processOwnMembershipChange(evt *gomatrix.Event) {
 	if evt.Unsigned.PrevContent != nil {
 		prevMembership, _ = evt.Unsigned.PrevContent["membership"].(string)
 	}
-	const Hour = 1 * 60 * 60 * 1000
+	if membership == prevMembership {
-	if membership == prevMembership || evt.Unsigned.Age > Hour {
 		return
 	}
 	switch membership {
@@ -279,18 +286,18 @@ func (c *Container) HandleMembership(evt *gomatrix.Event) {
 		return
 	}
 
-	message := mainView.ProcessMembershipEvent(roomView, evt)
+	message := mainView.ParseEvent(roomView, evt)
 	if message != nil {
 		// TODO this shouldn't be necessary
-		roomView.Room.UpdateState(evt)
+		roomView.MxRoom().UpdateState(evt)
 		// TODO This should probably also be in a different place
 		roomView.UpdateUserList()
 
 		if c.syncer.FirstSyncDone {
-			pushRules := c.PushRules().GetActions(roomView.Room, evt).Should()
+			pushRules := c.PushRules().GetActions(roomView.MxRoom(), evt).Should()
-			mainView.NotifyMessage(roomView.Room, message, pushRules)
+			mainView.NotifyMessage(roomView.MxRoom(), message, pushRules)
 		}
-		roomView.AddMessage(message, widget.AppendMessage)
+		roomView.AddMessage(message, ifc.AppendMessage)
 		c.ui.Render()
 	}
 }
@@ -403,3 +410,55 @@ func (c *Container) GetRoom(roomID string) *rooms.Room {
 	}
 	return room
 }
+
+var mxcRegex = regexp.MustCompile("mxc://(.+)/(.+)")
+
+func (c *Container) Download(mxcURL string) (data []byte, hs, id string, err error) {
+	parts := mxcRegex.FindStringSubmatch(mxcURL)
+	if parts == nil || len(parts) != 3 {
+		err = fmt.Errorf("invalid matrix content URL")
+		return
+	}
+	hs = parts[1]
+	id = parts[2]
+
+	cacheFile := c.GetCachePath(hs, id)
+	if _, err = os.Stat(cacheFile); err != nil {
+		data, err = ioutil.ReadFile(cacheFile)
+		if err == nil {
+			return
+		}
+	}
+
+	dlURL, _ := url.Parse(c.client.HomeserverURL.String())
+	dlURL.Path = path.Join(dlURL.Path, "/_matrix/media/v1/download", hs, id)
+
+	var resp *http.Response
+	resp, err = c.client.Client.Get(dlURL.String())
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, resp.Body)
+	if err != nil {
+		return
+	}
+
+	data = buf.Bytes()
+
+	err = ioutil.WriteFile(cacheFile, data, 0600)
+	return
+}
+
+func (c *Container) GetCachePath(homeserver, fileID string) string {
+	dir := filepath.Join(c.config.MediaDir, homeserver)
+
+	err := os.MkdirAll(dir, 0700)
+	if err != nil {
+		return ""
+	}
+
+	return filepath.Join(dir, fileID)
+}

matrix/rooms/room.go

@@ -94,11 +94,7 @@ func (room *Room) UpdateState(event *gomatrix.Event) {
 		room.memberCache = nil
 		room.firstMemberCache = ""
 		fallthrough
-	case "m.room.name":
+	case "m.room.name", "m.room.canonical_alias", "m.room.alias":
-		fallthrough
-	case "m.room.canonical_alias":
-		fallthrough
-	case "m.room.alias":
 		room.nameCache = ""
 	case "m.room.topic":
 		room.topicCache = ""

ui/debug/doc.go

@@ -1,2 +0,0 @@
-// Package debug contains utilities to display debug messages while running an interactive tview program.
-package debug

ui/message-view.go

@@ -0,0 +1,464 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package ui
+
+import (
+	"encoding/gob"
+	"fmt"
+	"math"
+	"os"
+
+	"maunium.net/go/gomuks/debug"
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/lib/open"
+	"maunium.net/go/gomuks/ui/messages"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+	"maunium.net/go/gomuks/ui/widget"
+	"maunium.net/go/tcell"
+	"maunium.net/go/tview"
+)
+
+type MessageView struct {
+	*tview.Box
+
+	parent *RoomView
+
+	ScrollOffset    int
+	MaxSenderWidth  int
+	DateFormat      string
+	TimestampFormat string
+	TimestampWidth  int
+	LoadingMessages bool
+
+	widestSender int
+	prevWidth    int
+	prevHeight   int
+	prevMsgCount int
+
+	messageIDs map[string]messages.UIMessage
+	messages   []messages.UIMessage
+
+	textBuffer []tstring.TString
+	metaBuffer []ifc.MessageMeta
+}
+
+func NewMessageView(parent *RoomView) *MessageView {
+	return &MessageView{
+		Box:    tview.NewBox(),
+		parent: parent,
+
+		MaxSenderWidth: 15,
+		TimestampWidth: len(messages.TimeFormat),
+		ScrollOffset:   0,
+
+		messages:   make([]messages.UIMessage, 0),
+		messageIDs: make(map[string]messages.UIMessage),
+		textBuffer: make([]tstring.TString, 0),
+		metaBuffer: make([]ifc.MessageMeta, 0),
+
+		widestSender: 5,
+		prevWidth:    -1,
+		prevHeight:   -1,
+		prevMsgCount: -1,
+	}
+}
+
+func (view *MessageView) SaveHistory(path string) error {
+	file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	enc := gob.NewEncoder(file)
+	err = enc.Encode(view.messages)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (view *MessageView) LoadHistory(gmx ifc.Gomuks, path string) (int, error) {
+	file, err := os.OpenFile(path, os.O_RDONLY, 0600)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return 0, nil
+		}
+		return -1, err
+	}
+	defer file.Close()
+
+	var msgs []messages.UIMessage
+
+	dec := gob.NewDecoder(file)
+	err = dec.Decode(&msgs)
+	if err != nil {
+		return -1, err
+	}
+
+	view.messages = make([]messages.UIMessage, len(msgs))
+	indexOffset := 0
+	for index, message := range msgs {
+		if message != nil {
+			view.messages[index-indexOffset] = message
+			view.updateWidestSender(message.Sender())
+			message.RegisterGomuks(gmx)
+		} else {
+			indexOffset++
+		}
+	}
+
+	return len(view.messages), nil
+}
+
+func (view *MessageView) updateWidestSender(sender string) {
+	if len(sender) > view.widestSender {
+		view.widestSender = len(sender)
+		if view.widestSender > view.MaxSenderWidth {
+			view.widestSender = view.MaxSenderWidth
+		}
+	}
+}
+
+func (view *MessageView) UpdateMessageID(ifcMessage ifc.Message, newID string) {
+	message, ok := ifcMessage.(messages.UIMessage)
+	if !ok {
+		debug.Print("[Warning] Passed non-UIMessage ifc.Message object to UpdateMessageID().")
+		debug.PrintStack()
+		return
+	}
+	delete(view.messageIDs, message.ID())
+	message.SetID(newID)
+	view.messageIDs[message.ID()] = message
+}
+
+func (view *MessageView) AddMessage(ifcMessage ifc.Message, direction ifc.MessageDirection) {
+	if ifcMessage == nil {
+		return
+	}
+	message, ok := ifcMessage.(messages.UIMessage)
+	if !ok {
+		debug.Print("[Warning] Passed non-UIMessage ifc.Message object to AddMessage().")
+		debug.PrintStack()
+		return
+	}
+
+	oldMsg, messageExists := view.messageIDs[message.ID()]
+	if messageExists {
+		oldMsg.CopyFrom(message)
+		message = oldMsg
+		direction = ifc.IgnoreMessage
+	}
+
+	view.updateWidestSender(message.Sender())
+
+	_, _, width, _ := view.GetInnerRect()
+	width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
+	message.CalculateBuffer(width)
+
+	if direction == ifc.AppendMessage {
+		if view.ScrollOffset > 0 {
+			view.ScrollOffset += message.Height()
+		}
+		view.messages = append(view.messages, message)
+		view.appendBuffer(message)
+	} else if direction == ifc.PrependMessage {
+		view.messages = append([]messages.UIMessage{message}, view.messages...)
+	} else {
+		view.replaceBuffer(message)
+	}
+
+	view.messageIDs[message.ID()] = message
+}
+
+func (view *MessageView) appendBuffer(message messages.UIMessage) {
+	if len(view.metaBuffer) > 0 {
+		prevMeta := view.metaBuffer[len(view.metaBuffer)-1]
+		if prevMeta != nil && prevMeta.FormatDate() != message.FormatDate() {
+			view.textBuffer = append(view.textBuffer, tstring.NewColorTString(
+				fmt.Sprintf("Date changed to %s", message.FormatDate()),
+				tcell.ColorGreen))
+			view.metaBuffer = append(view.metaBuffer, &messages.BasicMeta{
+				BTimestampColor: tcell.ColorDefault, BTextColor: tcell.ColorGreen})
+		}
+	}
+
+	view.textBuffer = append(view.textBuffer, message.Buffer()...)
+	for range message.Buffer() {
+		view.metaBuffer = append(view.metaBuffer, message)
+	}
+	view.prevMsgCount++
+}
+
+func (view *MessageView) replaceBuffer(message messages.UIMessage) {
+	start := -1
+	end := -1
+	for index, meta := range view.metaBuffer {
+		if meta == message {
+			if start == -1 {
+				start = index
+			}
+			end = index
+		} else if start != -1 {
+			break
+		}
+	}
+
+	if len(view.textBuffer) > end {
+		end++
+	}
+
+	view.textBuffer = append(append(view.textBuffer[0:start], message.Buffer()...), view.textBuffer[end:]...)
+	if len(message.Buffer()) != end-start+1 {
+		metaBuffer := view.metaBuffer[0:start]
+		for range message.Buffer() {
+			metaBuffer = append(metaBuffer, message)
+		}
+		view.metaBuffer = append(metaBuffer, view.metaBuffer[end:]...)
+	}
+}
+
+func (view *MessageView) recalculateBuffers() {
+	_, _, width, height := view.GetInnerRect()
+
+	width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
+	recalculateMessageBuffers := width != view.prevWidth
+	if height != view.prevHeight || recalculateMessageBuffers || len(view.messages) != view.prevMsgCount {
+		view.textBuffer = []tstring.TString{}
+		view.metaBuffer = []ifc.MessageMeta{}
+		view.prevMsgCount = 0
+		for i, message := range view.messages {
+			if message == nil {
+				debug.Print("O.o found nil message at", i)
+				break
+			}
+			if recalculateMessageBuffers {
+				message.CalculateBuffer(width)
+			}
+			view.appendBuffer(message)
+		}
+		view.prevHeight = height
+		view.prevWidth = width
+	}
+}
+
+func (view *MessageView) HandleClick(x, y int, button tcell.ButtonMask) bool {
+	if button != tcell.Button1 {
+		return false
+	}
+
+	_, _, _, height := view.GetRect()
+	line := view.TotalHeight() - view.ScrollOffset - height + y
+	if line < 0 || line >= view.TotalHeight() {
+		return false
+	}
+
+	message := view.metaBuffer[line]
+	var prevMessage ifc.MessageMeta
+	if line > 0 {
+		prevMessage = view.metaBuffer[line-1]
+	}
+
+	usernameX := view.TimestampWidth + TimestampSenderGap
+	messageX := usernameX + view.widestSender + SenderMessageGap
+	if x >= messageX {
+		switch message := message.(type) {
+		case *messages.ImageMessage:
+			open.Open(message.Path())
+		case messages.UIMessage:
+			debug.Print("Message clicked:", message.NotificationContent())
+		}
+	} else if x >= usernameX {
+		uiMessage, ok := message.(messages.UIMessage)
+		if !ok {
+			return false
+		}
+
+		prevUIMessage, _ := prevMessage.(messages.UIMessage)
+		if prevUIMessage != nil && prevUIMessage.Sender() == uiMessage.Sender() {
+			return false
+		}
+
+		sender := []rune(uiMessage.Sender())
+		if len(sender) == 0 {
+			return false
+		}
+
+		cursorPos := view.parent.input.GetCursorOffset()
+		text := []rune(view.parent.input.GetText())
+		var newText []rune
+		if cursorPos == 0 {
+			newText = append(sender, ':', ' ')
+			newText = append(newText, text...)
+		} else {
+			newText = append(text[0:cursorPos], sender...)
+			newText = append(newText, ' ')
+			newText = append(newText, text[cursorPos:]...)
+		}
+		view.parent.input.SetText(string(newText))
+		view.parent.input.SetCursorOffset(cursorPos + len(newText) - len(text))
+		return true
+	}
+	return false
+}
+
+const PaddingAtTop = 5
+
+func (view *MessageView) AddScrollOffset(diff int) {
+	_, _, _, height := view.GetInnerRect()
+
+	totalHeight := view.TotalHeight()
+	if diff >= 0 && view.ScrollOffset+diff >= totalHeight-height+PaddingAtTop {
+		view.ScrollOffset = totalHeight - height + PaddingAtTop
+	} else {
+		view.ScrollOffset += diff
+	}
+
+	if view.ScrollOffset > totalHeight-height+PaddingAtTop {
+		view.ScrollOffset = totalHeight - height + PaddingAtTop
+	}
+	if view.ScrollOffset < 0 {
+		view.ScrollOffset = 0
+	}
+}
+
+func (view *MessageView) Height() int {
+	_, _, _, height := view.GetInnerRect()
+	return height
+}
+
+func (view *MessageView) TotalHeight() int {
+	return len(view.textBuffer)
+}
+
+func (view *MessageView) IsAtTop() bool {
+	_, _, _, height := view.GetInnerRect()
+	totalHeight := len(view.textBuffer)
+	return view.ScrollOffset >= totalHeight-height+PaddingAtTop
+}
+
+const (
+	TimestampSenderGap = 1
+	SenderSeparatorGap = 1
+	SenderMessageGap   = 3
+)
+
+func getScrollbarStyle(scrollbarHere, isTop, isBottom bool) (char rune, style tcell.Style) {
+	char = '│'
+	style = tcell.StyleDefault
+	if scrollbarHere {
+		style = style.Foreground(tcell.ColorGreen)
+	}
+	if isTop {
+		if scrollbarHere {
+			char = '╥'
+		} else {
+			char = '┬'
+		}
+	} else if isBottom {
+		if scrollbarHere {
+			char = '╨'
+		} else {
+			char = '┴'
+		}
+	} else if scrollbarHere {
+		char = '║'
+	}
+	return
+}
+
+func (view *MessageView) Draw(screen tcell.Screen) {
+	view.Box.Draw(screen)
+
+	x, y, _, height := view.GetInnerRect()
+	view.recalculateBuffers()
+
+	if view.TotalHeight() == 0 {
+		widget.WriteLineSimple(screen, "It's quite empty in here.", x, y+height)
+		return
+	}
+
+	usernameX := x + view.TimestampWidth + TimestampSenderGap
+	messageX := usernameX + view.widestSender + SenderMessageGap
+	separatorX := usernameX + view.widestSender + SenderSeparatorGap
+
+	indexOffset := view.TotalHeight() - view.ScrollOffset - height
+	if indexOffset <= -PaddingAtTop {
+		message := "Scroll up to load more messages."
+		if view.LoadingMessages {
+			message = "Loading more messages..."
+		}
+		widget.WriteLineSimpleColor(screen, message, messageX, y, tcell.ColorGreen)
+	}
+
+	if len(view.textBuffer) != len(view.metaBuffer) {
+		debug.Printf("Unexpected text/meta buffer length mismatch: %d != %d.", len(view.textBuffer), len(view.metaBuffer))
+		return
+	}
+
+	var scrollBarHeight, scrollBarPos int
+	// Black magic (aka math) used to figure out where the scroll bar should be put.
+	{
+		viewportHeight := float64(height)
+		contentHeight := float64(view.TotalHeight())
+
+		scrollBarHeight = int(math.Ceil(viewportHeight / (contentHeight / viewportHeight)))
+
+		scrollBarPos = height - int(math.Round(float64(view.ScrollOffset)/contentHeight*viewportHeight))
+	}
+
+	var prevMeta ifc.MessageMeta
+	firstLine := true
+	skippedLines := 0
+
+	for line := 0; line < height; line++ {
+		index := indexOffset + line
+		if index < 0 {
+			skippedLines++
+			continue
+		} else if index >= view.TotalHeight() {
+			break
+		}
+
+		showScrollbar := line-skippedLines >= scrollBarPos-scrollBarHeight && line-skippedLines < scrollBarPos
+		isTop := firstLine && view.ScrollOffset+height >= view.TotalHeight()
+		isBottom := line == height-1 && view.ScrollOffset == 0
+
+		borderChar, borderStyle := getScrollbarStyle(showScrollbar, isTop, isBottom)
+
+		firstLine = false
+
+		screen.SetContent(separatorX, y+line, borderChar, nil, borderStyle)
+
+		text, meta := view.textBuffer[index], view.metaBuffer[index]
+		if meta != prevMeta {
+			if len(meta.FormatTime()) > 0 {
+				widget.WriteLineSimpleColor(screen, meta.FormatTime(), x, y+line, meta.TimestampColor())
+			}
+			if prevMeta == nil || meta.Sender() != prevMeta.Sender() {
+				widget.WriteLineColor(
+					screen, tview.AlignRight, meta.Sender(),
+					usernameX, y+line, view.widestSender,
+					meta.SenderColor())
+			}
+			prevMeta = meta
+		}
+
+		text.Draw(screen, messageX, y+line)
+	}
+}

ui/messages/base.go

@@ -0,0 +1,234 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"encoding/gob"
+	"time"
+
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+	"maunium.net/go/gomuks/ui/widget"
+	"maunium.net/go/tcell"
+)
+
+func init() {
+	gob.Register(&BaseMessage{})
+}
+
+type BaseMessage struct {
+	MsgID           string
+	MsgType         string
+	MsgSender       string
+	MsgSenderColor  tcell.Color
+	MsgTimestamp    time.Time
+	MsgState        ifc.MessageState
+	MsgIsHighlight  bool
+	MsgIsService    bool
+	buffer          []tstring.TString
+	prevBufferWidth int
+}
+
+func newBaseMessage(id, sender, msgtype string, timestamp time.Time) BaseMessage {
+	return BaseMessage{
+		MsgSender:       sender,
+		MsgTimestamp:    timestamp,
+		MsgSenderColor:  widget.GetHashColor(sender),
+		MsgType:         msgtype,
+		MsgID:           id,
+		prevBufferWidth: 0,
+		MsgState:        ifc.MessageStateDefault,
+		MsgIsHighlight:  false,
+		MsgIsService:    false,
+	}
+}
+
+func (msg *BaseMessage) RegisterGomuks(gmx ifc.Gomuks) {}
+
+// CopyFrom replaces the content of this message object with the content of the given object.
+func (msg *BaseMessage) CopyFrom(from ifc.MessageMeta) {
+	msg.MsgSender = from.Sender()
+	msg.MsgSenderColor = from.SenderColor()
+
+	fromMsg, ok := from.(UIMessage)
+	if ok {
+		msg.MsgSender = fromMsg.RealSender()
+		msg.MsgID = fromMsg.ID()
+		msg.MsgType = fromMsg.Type()
+		msg.MsgTimestamp = fromMsg.Timestamp()
+		msg.MsgState = fromMsg.State()
+		msg.MsgIsService = fromMsg.IsService()
+		msg.MsgIsHighlight = fromMsg.IsHighlight()
+		msg.buffer = nil
+	}
+}
+
+// Sender gets the string that should be displayed as the sender of this message.
+//
+// If the message is being sent, the sender is "Sending...".
+// If sending has failed, the sender is "Error".
+// If the message is an emote, the sender is blank.
+// In any other case, the sender is the display name of the user who sent the message.
+func (msg *BaseMessage) Sender() string {
+	switch msg.MsgState {
+	case ifc.MessageStateSending:
+		return "Sending..."
+	case ifc.MessageStateFailed:
+		return "Error"
+	}
+	switch msg.MsgType {
+	case "m.emote":
+		// Emotes don't show a separate sender, it's included in the buffer.
+		return ""
+	default:
+		return msg.MsgSender
+	}
+}
+
+func (msg *BaseMessage) RealSender() string {
+	return msg.MsgSender
+}
+
+func (msg *BaseMessage) getStateSpecificColor() tcell.Color {
+	switch msg.MsgState {
+	case ifc.MessageStateSending:
+		return tcell.ColorGray
+	case ifc.MessageStateFailed:
+		return tcell.ColorRed
+	case ifc.MessageStateDefault:
+		fallthrough
+	default:
+		return tcell.ColorDefault
+	}
+}
+
+// SenderColor returns the color the name of the sender should be shown in.
+//
+// If the message is being sent, the color is gray.
+// If sending has failed, the color is red.
+//
+// In any other case, the color is whatever is specified in the Message struct.
+// Usually that means it is the hash-based color of the sender (see ui/widget/color.go)
+func (msg *BaseMessage) SenderColor() tcell.Color {
+	stateColor := msg.getStateSpecificColor()
+	switch {
+	case stateColor != tcell.ColorDefault:
+		return stateColor
+	case msg.MsgIsService:
+		return tcell.ColorGray
+	default:
+		return msg.MsgSenderColor
+	}
+}
+
+// TextColor returns the color the actual content of the message should be shown in.
+func (msg *BaseMessage) TextColor() tcell.Color {
+	stateColor := msg.getStateSpecificColor()
+	switch {
+	case stateColor != tcell.ColorDefault:
+		return stateColor
+	case msg.MsgIsService, msg.MsgType == "m.notice":
+		return tcell.ColorGray
+	case msg.MsgIsHighlight:
+		return tcell.ColorYellow
+	case msg.MsgType == "m.room.member":
+		return tcell.ColorGreen
+	default:
+		return tcell.ColorDefault
+	}
+}
+
+// TimestampColor returns the color the timestamp should be shown in.
+//
+// As with SenderColor(), messages being sent and messages that failed to be sent are
+// gray and red respectively.
+//
+// However, other messages are the default color instead of a color stored in the struct.
+func (msg *BaseMessage) TimestampColor() tcell.Color {
+	return msg.getStateSpecificColor()
+}
+
+// Buffer returns the computed text buffer.
+//
+// The buffer contains the text of the message split into lines with a maximum
+// width of whatever was provided to CalculateBuffer().
+//
+// N.B. This will NOT automatically calculate the buffer if it hasn't been
+//      calculated already, as that requires the target width.
+func (msg *BaseMessage) Buffer() []tstring.TString {
+	return msg.buffer
+}
+
+// Height returns the number of rows in the computed buffer (see Buffer()).
+func (msg *BaseMessage) Height() int {
+	return len(msg.buffer)
+}
+
+// Timestamp returns the full timestamp when the message was sent.
+func (msg *BaseMessage) Timestamp() time.Time {
+	return msg.MsgTimestamp
+}
+
+// FormatTime returns the formatted time when the message was sent.
+func (msg *BaseMessage) FormatTime() string {
+	return msg.MsgTimestamp.Format(TimeFormat)
+}
+
+// FormatDate returns the formatted date when the message was sent.
+func (msg *BaseMessage) FormatDate() string {
+	return msg.MsgTimestamp.Format(DateFormat)
+}
+
+func (msg *BaseMessage) ID() string {
+	return msg.MsgID
+}
+
+func (msg *BaseMessage) SetID(id string) {
+	msg.MsgID = id
+}
+
+func (msg *BaseMessage) Type() string {
+	return msg.MsgType
+}
+
+func (msg *BaseMessage) SetType(msgtype string) {
+	msg.MsgType = msgtype
+}
+
+func (msg *BaseMessage) State() ifc.MessageState {
+	return msg.MsgState
+}
+
+func (msg *BaseMessage) SetState(state ifc.MessageState) {
+	msg.MsgState = state
+}
+
+func (msg *BaseMessage) IsHighlight() bool {
+	return msg.MsgIsHighlight
+}
+
+func (msg *BaseMessage) SetIsHighlight(isHighlight bool) {
+	msg.MsgIsHighlight = isHighlight
+}
+
+func (msg *BaseMessage) IsService() bool {
+	return msg.MsgIsService
+}
+
+func (msg *BaseMessage) SetIsService(isService bool) {
+	msg.MsgIsService = isService
+}

ui/messages/doc.go

@@ -0,0 +1,2 @@
+// Package messages contains different message types and code to generate and render them.
+package messages

ui/messages/expandedtextmessage.go

@@ -0,0 +1,71 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"encoding/gob"
+	"time"
+
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+)
+
+func init() {
+	gob.Register(&ExpandedTextMessage{})
+}
+
+type ExpandedTextMessage struct {
+	BaseTextMessage
+	MsgText tstring.TString
+}
+
+// NewExpandedTextMessage creates a new ExpandedTextMessage object with the provided values and the default state.
+func NewExpandedTextMessage(id, sender, msgtype string, text tstring.TString, timestamp time.Time) UIMessage {
+	return &ExpandedTextMessage{
+		BaseTextMessage: newBaseTextMessage(id, sender, msgtype, timestamp),
+		MsgText: text,
+	}
+}
+
+func (msg *ExpandedTextMessage) GenerateText() tstring.TString {
+	return msg.MsgText
+}
+
+// CopyFrom replaces the content of this message object with the content of the given object.
+func (msg *ExpandedTextMessage) CopyFrom(from ifc.MessageMeta) {
+	msg.BaseTextMessage.CopyFrom(from)
+
+	fromExpandedMsg, ok := from.(*ExpandedTextMessage)
+	if ok {
+		msg.MsgText = fromExpandedMsg.MsgText
+	}
+
+	msg.RecalculateBuffer()
+}
+
+func (msg *ExpandedTextMessage) NotificationContent() string {
+	return msg.MsgText.String()
+}
+
+func (msg *ExpandedTextMessage) CalculateBuffer(width int) {
+	msg.BaseTextMessage.calculateBufferWithText(msg.MsgText, width)
+}
+
+// RecalculateBuffer calculates the buffer again with the previously provided width.
+func (msg *ExpandedTextMessage) RecalculateBuffer() {
+	msg.CalculateBuffer(msg.prevBufferWidth)
+}

ui/messages/imagemessage.go

@@ -0,0 +1,123 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"bytes"
+	"encoding/gob"
+	"fmt"
+	"time"
+
+	"image/color"
+
+	"maunium.net/go/gomuks/debug"
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/lib/ansimage"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+	"maunium.net/go/tcell"
+)
+
+func init() {
+	gob.Register(&ImageMessage{})
+}
+
+type ImageMessage struct {
+	BaseMessage
+	Homeserver string
+	FileID     string
+	data       []byte
+
+	gmx ifc.Gomuks
+}
+
+// NewImageMessage creates a new ImageMessage object with the provided values and the default state.
+func NewImageMessage(gmx ifc.Gomuks, id, sender, msgtype, homeserver, fileID string, data []byte, timestamp time.Time) UIMessage {
+	return &ImageMessage{
+		newBaseMessage(id, sender, msgtype, timestamp),
+		homeserver,
+		fileID,
+		data,
+		gmx,
+	}
+}
+
+func (msg *ImageMessage) RegisterGomuks(gmx ifc.Gomuks) {
+	msg.gmx = gmx
+
+	debug.Print(len(msg.data), msg.data)
+	if len(msg.data) == 0 {
+		go func() {
+			defer gmx.Recover()
+			msg.updateData()
+		}()
+	}
+}
+
+func (msg *ImageMessage) NotificationContent() string {
+	return "Sent an image"
+}
+
+func (msg *ImageMessage) updateData() {
+	debug.Print("Loading image:", msg.Homeserver, msg.FileID)
+	data, _, _, err := msg.gmx.Matrix().Download(fmt.Sprintf("mxc://%s/%s", msg.Homeserver, msg.FileID))
+	if err != nil {
+		debug.Print("Failed to download image %s/%s: %v", msg.Homeserver, msg.FileID, err)
+		return
+	}
+	msg.data = data
+}
+
+func (msg *ImageMessage) Path() string {
+	return msg.gmx.Matrix().GetCachePath(msg.Homeserver, msg.FileID)
+}
+
+// CopyFrom replaces the content of this message object with the content of the given object.
+func (msg *ImageMessage) CopyFrom(from ifc.MessageMeta) {
+	msg.BaseMessage.CopyFrom(from)
+
+	fromImgMsg, ok := from.(*ImageMessage)
+	if ok {
+		msg.data = fromImgMsg.data
+	}
+
+	msg.RecalculateBuffer()
+}
+
+// CalculateBuffer generates the internal buffer for this message that consists
+// of the text of this message split into lines at most as wide as the width
+// parameter.
+func (msg *ImageMessage) CalculateBuffer(width int) {
+	if width < 2 {
+		return
+	}
+
+	image, err := ansimage.NewScaledFromReader(bytes.NewReader(msg.data), 0, width, color.Black)
+	if err != nil {
+		msg.buffer = []tstring.TString{tstring.NewColorTString("Failed to display image", tcell.ColorRed)}
+		debug.Print("Failed to display image:", err)
+		return
+	}
+
+	msg.buffer = image.Render()
+	msg.prevBufferWidth = width
+}
+
+// RecalculateBuffer calculates the buffer again with the previously provided width.
+func (msg *ImageMessage) RecalculateBuffer() {
+	msg.CalculateBuffer(msg.prevBufferWidth)
+}
+

ui/messages/message.go

@@ -0,0 +1,38 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+)
+
+// Message is a wrapper for the content and metadata of a Matrix message intended to be displayed.
+type UIMessage interface {
+	ifc.Message
+
+	CalculateBuffer(width int)
+	RecalculateBuffer()
+	Buffer() []tstring.TString
+	Height() int
+
+	RealSender() string
+	RegisterGomuks(gmx ifc.Gomuks)
+}
+
+const DateFormat = "January _2, 2006"
+const TimeFormat = "15:04:05"

ui/messages/meta.go

@@ -0,0 +1,77 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"time"
+
+	"maunium.net/go/tcell"
+	"maunium.net/go/gomuks/interface"
+)
+
+// BasicMeta is a simple variable store implementation of MessageMeta.
+type BasicMeta struct {
+	BSender string
+	BTimestamp time.Time
+	BSenderColor, BTextColor, BTimestampColor tcell.Color
+}
+
+// Sender gets the string that should be displayed as the sender of this message.
+func (meta *BasicMeta) Sender() string {
+	return meta.BSender
+}
+
+// SenderColor returns the color the name of the sender should be shown in.
+func (meta *BasicMeta) SenderColor() tcell.Color {
+	return meta.BSenderColor
+}
+
+// Timestamp returns the full time when the message was sent.
+func (meta *BasicMeta) Timestamp() time.Time {
+	return meta.BTimestamp
+}
+
+// FormatTime returns the formatted time when the message was sent.
+func (meta *BasicMeta) FormatTime() string {
+	return meta.BTimestamp.Format(TimeFormat)
+}
+
+// FormatDate returns the formatted date when the message was sent.
+func (meta *BasicMeta) FormatDate() string {
+	return meta.BTimestamp.Format(DateFormat)
+}
+
+// TextColor returns the color the actual content of the message should be shown in.
+func (meta *BasicMeta) TextColor() tcell.Color {
+	return meta.BTextColor
+}
+
+// TimestampColor returns the color the timestamp should be shown in.
+//
+// This usually does not apply to the date, as it is rendered separately from the message.
+func (meta *BasicMeta) TimestampColor() tcell.Color {
+	return meta.BTimestampColor
+}
+
+// CopyFrom replaces the content of this meta object with the content of the given object.
+func (meta *BasicMeta) CopyFrom(from ifc.MessageMeta) {
+	meta.BSender = from.Sender()
+	meta.BTimestamp = from.Timestamp()
+	meta.BSenderColor = from.SenderColor()
+	meta.BTextColor = from.TextColor()
+	meta.BTimestampColor = from.TimestampColor()
+}

ui/messages/parser/htmlparser.go

@@ -0,0 +1,186 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package parser
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"regexp"
+	"strings"
+
+	"maunium.net/go/gomatrix"
+	"maunium.net/go/gomuks/debug"
+	"maunium.net/go/gomuks/lib/htmlparser"
+	"maunium.net/go/gomuks/matrix/rooms"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+	"maunium.net/go/gomuks/ui/widget"
+	"maunium.net/go/tcell"
+)
+
+var matrixToURL = regexp.MustCompile("^(?:https?://)?(?:www\\.)?matrix\\.to/#/([#@!].*)")
+
+type MatrixHTMLProcessor struct {
+	text tstring.TString
+
+	indent    string
+	listType  string
+	lineIsNew bool
+	openTags  *TagArray
+
+	room *rooms.Room
+}
+
+func (parser *MatrixHTMLProcessor) newline() {
+	if !parser.lineIsNew {
+		parser.text = parser.text.Append("\n" + parser.indent)
+		parser.lineIsNew = true
+	}
+}
+
+func (parser *MatrixHTMLProcessor) Preprocess() {}
+
+func (parser *MatrixHTMLProcessor) HandleText(text string) {
+	style := tcell.StyleDefault
+	for _, tag := range *parser.openTags {
+		switch tag.Tag {
+		case "b", "strong":
+			style = style.Bold(true)
+		case "i", "em":
+			style = style.Italic(true)
+		case "s", "del":
+			style = style.Strikethrough(true)
+		case "u", "ins":
+			style = style.Underline(true)
+		case "a":
+			tag.Text += text
+			return
+		}
+	}
+
+	if !parser.openTags.Has("pre", "code") {
+		text = strings.Replace(text, "\n", "", -1)
+	}
+	parser.text = parser.text.AppendStyle(text, style)
+	parser.lineIsNew = false
+}
+
+func (parser *MatrixHTMLProcessor) HandleStartTag(tagName string, attrs map[string]string) {
+	tag := &TagWithMeta{Tag: tagName}
+	switch tag.Tag {
+	case "h1", "h2", "h3", "h4", "h5", "h6":
+		length := int(tag.Tag[1] - '0')
+		parser.text = parser.text.Append(strings.Repeat("#", length) + " ")
+		parser.lineIsNew = false
+	case "a":
+		tag.Meta, _ = attrs["href"]
+	case "ol", "ul":
+		parser.listType = tag.Tag
+	case "li":
+		indentSize := 2
+		if parser.listType == "ol" {
+			list := parser.openTags.Get(parser.listType)
+			list.Counter++
+			parser.text = parser.text.Append(fmt.Sprintf("%d. ", list.Counter))
+			indentSize = int(math.Log10(float64(list.Counter))+1) + len(". ")
+		} else {
+			parser.text = parser.text.Append("* ")
+		}
+		parser.indent += strings.Repeat(" ", indentSize)
+		parser.lineIsNew = false
+	case "blockquote":
+		parser.indent += "> "
+		parser.text = parser.text.Append("> ")
+		parser.lineIsNew = false
+	}
+	parser.openTags.PushMeta(tag)
+}
+
+func (parser *MatrixHTMLProcessor) HandleSelfClosingTag(tagName string, attrs map[string]string) {
+	if tagName == "br" {
+		parser.newline()
+	}
+}
+
+func (parser *MatrixHTMLProcessor) HandleEndTag(tagName string) {
+	tag := parser.openTags.Pop(tagName)
+
+	switch tag.Tag {
+	case "li", "blockquote":
+		indentSize := 2
+		if tag.Tag == "li" && parser.listType == "ol" {
+			list := parser.openTags.Get(parser.listType)
+			indentSize = int(math.Log10(float64(list.Counter))+1) + len(". ")
+		}
+		if len(parser.indent) >= indentSize {
+			parser.indent = parser.indent[0 : len(parser.indent)-indentSize]
+		}
+		// TODO this newline is sometimes not good
+		parser.newline()
+	case "a":
+		match := matrixToURL.FindStringSubmatch(tag.Meta)
+		if len(match) == 2 {
+			pillTarget := match[1]
+			if pillTarget[0] == '@' {
+				if member := parser.room.GetMember(pillTarget); member != nil {
+					parser.text = parser.text.AppendColor(member.DisplayName, widget.GetHashColor(member.DisplayName))
+				} else {
+					parser.text = parser.text.Append(pillTarget)
+				}
+			} else {
+				parser.text = parser.text.Append(pillTarget)
+			}
+		} else {
+			// TODO make text clickable rather than printing URL
+			parser.text = parser.text.Append(fmt.Sprintf("%s (%s)", tag.Text, tag.Meta))
+		}
+		parser.lineIsNew = false
+	case "p", "pre", "ol", "ul", "h1", "h2", "h3", "h4", "h5", "h6", "div":
+		// parser.newline()
+	}
+}
+
+func (parser *MatrixHTMLProcessor) ReceiveError(err error) {
+	if err != io.EOF {
+		debug.Print("Unexpected error parsing HTML:", err)
+	}
+}
+
+func (parser *MatrixHTMLProcessor) Postprocess() {
+	if len(parser.text) > 0 && parser.text[len(parser.text)-1].Char == '\n' {
+		parser.text = parser.text[:len(parser.text)-1]
+	}
+}
+
+// ParseHTMLMessage parses a HTML-formatted Matrix event into a UIMessage.
+func ParseHTMLMessage(room *rooms.Room, evt *gomatrix.Event) tstring.TString {
+	htmlData, _ := evt.Content["formatted_body"].(string)
+
+	processor := &MatrixHTMLProcessor{
+		room:      room,
+		text:      tstring.NewBlankTString(),
+		indent:    "",
+		listType:  "",
+		lineIsNew: true,
+		openTags:  &TagArray{},
+	}
+
+	parser := htmlparser.NewHTMLParserFromString(htmlData, processor)
+	parser.Process()
+
+	return processor.text
+}

ui/messages/parser/htmltagarray.go

@@ -0,0 +1,118 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package parser
+
+// TagWithMeta is an open HTML tag with some metadata (e.g. list index, a href value).
+type TagWithMeta struct {
+	Tag     string
+	Counter int
+	Meta    string
+	Text    string
+}
+
+// BlankTag is a blank TagWithMeta object.
+var BlankTag = &TagWithMeta{}
+
+// TagArray is a reversed queue for remembering what HTML tags are open.
+type TagArray []*TagWithMeta
+
+// Pushb converts the given byte array into a string and calls Push().
+func (ta *TagArray) Pushb(tag []byte) {
+	ta.Push(string(tag))
+}
+
+// Popb converts the given byte array into a string and calls Pop().
+func (ta *TagArray) Popb(tag []byte) *TagWithMeta {
+	return ta.Pop(string(tag))
+}
+
+// Indexb converts the given byte array into a string and calls Index().
+func (ta *TagArray) Indexb(tag []byte) {
+	ta.Index(string(tag))
+}
+
+// IndexAfterb converts the given byte array into a string and calls IndexAfter().
+func (ta *TagArray) IndexAfterb(tag []byte, after int) {
+	ta.IndexAfter(string(tag), after)
+}
+
+// Push adds the given tag to the array.
+func (ta *TagArray) Push(tag string) {
+	ta.PushMeta(&TagWithMeta{Tag: tag})
+}
+
+// Push adds the given tag to the array.
+func (ta *TagArray) PushMeta(tag *TagWithMeta) {
+	*ta = append(*ta, BlankTag)
+	copy((*ta)[1:], *ta)
+	(*ta)[0] = tag
+}
+
+// Pop removes the given tag from the array.
+func (ta *TagArray) Pop(tag string) (removed *TagWithMeta) {
+	if (*ta)[0].Tag == tag {
+		// This is the default case and is lighter than append(), so we handle it separately.
+		removed = (*ta)[0]
+		*ta = (*ta)[1:]
+	} else if index := ta.Index(tag); index != -1 {
+		removed = (*ta)[index]
+		*ta = append((*ta)[:index], (*ta)[index+1:]...)
+	}
+	return
+}
+
+// Index returns the first index where the given tag is, or -1 if it's not in the list.
+func (ta *TagArray) Index(tag string) int {
+	return ta.IndexAfter(tag, -1)
+}
+
+// IndexAfter returns the first index after the given index where the given tag is,
+// or -1 if the given tag is not on the list after the given index.
+func (ta *TagArray) IndexAfter(tag string, after int) int {
+	for i := after + 1; i < len(*ta); i++ {
+		if (*ta)[i].Tag == tag {
+			return i
+		}
+	}
+	return -1
+}
+
+// Get returns the first occurrence of the given tag, or nil if it's not in the list.
+func (ta *TagArray) Get(tag string) *TagWithMeta {
+	return ta.GetAfter(tag, -1)
+}
+
+// IndexAfter returns the first occurrence of the given tag, or nil if the given
+// tag is not on the list after the given index.
+func (ta *TagArray) GetAfter(tag string, after int) *TagWithMeta {
+	for i := after + 1; i < len(*ta); i++ {
+		if (*ta)[i].Tag == tag {
+			return (*ta)[i]
+		}
+	}
+	return nil
+}
+
+// Has returns whether or not the list has at least one of the given tags.
+func (ta *TagArray) Has(tags ...string) bool {
+	for _, tag := range tags {
+		if index := ta.Index(tag); index != -1 {
+			return true
+		}
+	}
+	return false
+}

ui/messages/parser/parser.go

@@ -0,0 +1,128 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package parser
+
+import (
+	"fmt"
+	"time"
+
+	"maunium.net/go/gomatrix"
+	"maunium.net/go/gomuks/debug"
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/matrix/rooms"
+	"maunium.net/go/gomuks/ui/messages"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+	"maunium.net/go/gomuks/ui/widget"
+	"maunium.net/go/tcell"
+)
+
+func ParseEvent(gmx ifc.Gomuks, room *rooms.Room, evt *gomatrix.Event) messages.UIMessage {
+	member := room.GetMember(evt.Sender)
+	if member != nil {
+		evt.Sender = member.DisplayName
+	}
+	switch evt.Type {
+	case "m.room.message":
+		return ParseMessage(gmx, room, evt)
+	case "m.room.member":
+		return ParseMembershipEvent(evt)
+	}
+	return nil
+}
+
+func unixToTime(unix int64) time.Time {
+	timestamp := time.Now()
+	if unix != 0 {
+		timestamp = time.Unix(unix/1000, unix%1000*1000)
+	}
+	return timestamp
+}
+
+func ParseMessage(gmx ifc.Gomuks, room *rooms.Room, evt *gomatrix.Event) messages.UIMessage {
+	msgtype, _ := evt.Content["msgtype"].(string)
+	ts := unixToTime(evt.Timestamp)
+	switch msgtype {
+	case "m.text", "m.notice", "m.emote":
+		format, hasFormat := evt.Content["format"].(string)
+		if hasFormat && format == "org.matrix.custom.html" {
+			text := ParseHTMLMessage(room, evt)
+			return messages.NewExpandedTextMessage(evt.ID, evt.Sender, msgtype, text, ts)
+		} else {
+			text, _ := evt.Content["body"].(string)
+			return messages.NewTextMessage(evt.ID, evt.Sender, msgtype, text, ts)
+		}
+	case "m.image":
+		url, _ := evt.Content["url"].(string)
+		data, hs, id, err := gmx.Matrix().Download(url)
+		if err != nil {
+			debug.Printf("Failed to download %s: %v", url, err)
+		}
+		return messages.NewImageMessage(gmx, evt.ID, evt.Sender, msgtype, hs, id, data, ts)
+	}
+	return nil
+}
+
+func getMembershipEventContent(evt *gomatrix.Event) (sender string, text tstring.TString) {
+	membership, _ := evt.Content["membership"].(string)
+	displayname, _ := evt.Content["displayname"].(string)
+	if len(displayname) == 0 {
+		displayname = *evt.StateKey
+	}
+	prevMembership := "leave"
+	prevDisplayname := ""
+	if evt.Unsigned.PrevContent != nil {
+		prevMembership, _ = evt.Unsigned.PrevContent["membership"].(string)
+		prevDisplayname, _ = evt.Unsigned.PrevContent["displayname"].(string)
+	}
+
+	if membership != prevMembership {
+		switch membership {
+		case "invite":
+			sender = "---"
+			text = tstring.NewColorTString(fmt.Sprintf("%s invited %s.", evt.Sender, displayname), tcell.ColorGreen)
+			text.Colorize(0, len(evt.Sender), widget.GetHashColor(evt.Sender))
+			text.Colorize(len(evt.Sender)+len(" invited "), len(displayname), widget.GetHashColor(displayname))
+		case "join":
+			sender = "-->"
+			text = tstring.NewColorTString(fmt.Sprintf("%s joined the room.", displayname), tcell.ColorGreen)
+			text.Colorize(0, len(displayname), widget.GetHashColor(displayname))
+		case "leave":
+			sender = "<--"
+			if evt.Sender != *evt.StateKey {
+				reason, _ := evt.Content["reason"].(string)
+				text = tstring.NewColorTString(fmt.Sprintf("%s kicked %s: %s", evt.Sender, displayname, reason), tcell.ColorRed)
+				text.Colorize(0, len(evt.Sender), widget.GetHashColor(evt.Sender))
+				text.Colorize(len(evt.Sender)+len(" kicked "), len(displayname), widget.GetHashColor(displayname))
+			} else {
+				text = tstring.NewColorTString(fmt.Sprintf("%s left the room.", displayname), tcell.ColorRed)
+				text.Colorize(0, len(displayname), widget.GetHashColor(displayname))
+			}
+		}
+	} else if displayname != prevDisplayname {
+		sender = "---"
+		text = tstring.NewColorTString(fmt.Sprintf("%s changed their display name to %s.", prevDisplayname, displayname), tcell.ColorYellow)
+		text.Colorize(0, len(prevDisplayname), widget.GetHashColor(prevDisplayname))
+		text.Colorize(len(prevDisplayname)+len(" changed their display name to "), len(displayname), widget.GetHashColor(displayname))
+	}
+	return
+}
+
+func ParseMembershipEvent(evt *gomatrix.Event) messages.UIMessage {
+	sender, text := getMembershipEventContent(evt)
+	ts := unixToTime(evt.Timestamp)
+	return messages.NewExpandedTextMessage(evt.ID, sender, "m.room.membership", text, ts)
+}

ui/messages/textbase.go

@@ -0,0 +1,84 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"encoding/gob"
+	"regexp"
+	"time"
+
+	"maunium.net/go/gomuks/ui/messages/tstring"
+)
+
+func init() {
+	gob.Register(BaseTextMessage{})
+}
+
+type BaseTextMessage struct {
+	BaseMessage
+}
+
+func newBaseTextMessage(id, sender, msgtype string, timestamp time.Time) BaseTextMessage {
+	return BaseTextMessage{newBaseMessage(id, sender, msgtype, timestamp)}
+}
+
+// Regular expressions used to split lines when calculating the buffer.
+//
+// From tview/textview.go
+var (
+	boundaryPattern = regexp.MustCompile("([[:punct:]]\\s*|\\s+)")
+	spacePattern    = regexp.MustCompile(`\s+`)
+)
+
+// CalculateBuffer generates the internal buffer for this message that consists
+// of the text of this message split into lines at most as wide as the width
+// parameter.
+func (msg *BaseTextMessage) calculateBufferWithText(text tstring.TString, width int) {
+	if width < 2 {
+		return
+	}
+
+	msg.buffer = []tstring.TString{}
+
+	forcedLinebreaks := text.Split('\n')
+	newlines := 0
+	for _, str := range forcedLinebreaks {
+		if len(str) == 0 && newlines < 1 {
+			msg.buffer = append(msg.buffer, tstring.TString{})
+			newlines++
+		} else {
+			newlines = 0
+		}
+		// Mostly from tview/textview.go#reindexBuffer()
+		for len(str) > 0 {
+			extract := str.Truncate(width)
+			if len(extract) < len(str) {
+				if spaces := spacePattern.FindStringIndex(str[len(extract):].String()); spaces != nil && spaces[0] == 0 {
+					extract = str[:len(extract)+spaces[1]]
+				}
+
+				matches := boundaryPattern.FindAllStringIndex(extract.String(), -1)
+				if len(matches) > 0 {
+					extract = extract[:matches[len(matches)-1][1]]
+				}
+			}
+			msg.buffer = append(msg.buffer, extract)
+			str = str[len(extract):]
+		}
+	}
+	msg.prevBufferWidth = width
+}

ui/messages/textmessage.go

@@ -0,0 +1,102 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"encoding/gob"
+	"fmt"
+	"time"
+
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/ui/messages/tstring"
+)
+
+func init() {
+	gob.Register(&TextMessage{})
+}
+
+type TextMessage struct {
+	BaseTextMessage
+	cache   tstring.TString
+	MsgText string
+}
+
+// NewTextMessage creates a new UITextMessage object with the provided values and the default state.
+func NewTextMessage(id, sender, msgtype, text string, timestamp time.Time) UIMessage {
+	return &TextMessage{
+		BaseTextMessage: newBaseTextMessage(id, sender, msgtype, timestamp),
+		MsgText:         text,
+	}
+}
+
+func (msg *TextMessage) getCache() tstring.TString {
+	if msg.cache == nil {
+		switch msg.MsgType {
+		case "m.emote":
+			msg.cache = tstring.NewColorTString(fmt.Sprintf("* %s %s", msg.MsgSender, msg.MsgText), msg.TextColor())
+			msg.cache.Colorize(0, len(msg.MsgSender)+2, msg.SenderColor())
+		default:
+			msg.cache = tstring.NewColorTString(msg.MsgText, msg.TextColor())
+		}
+	}
+	return msg.cache
+}
+
+// CopyFrom replaces the content of this message object with the content of the given object.
+func (msg *TextMessage) CopyFrom(from ifc.MessageMeta) {
+	msg.BaseTextMessage.CopyFrom(from)
+
+	fromTextMsg, ok := from.(*TextMessage)
+	if ok {
+		msg.MsgText = fromTextMsg.MsgText
+	}
+
+	msg.cache = nil
+	msg.RecalculateBuffer()
+}
+func (msg *TextMessage) SetType(msgtype string) {
+	msg.BaseTextMessage.SetType(msgtype)
+	msg.cache = nil
+}
+
+func (msg *TextMessage) SetState(state ifc.MessageState) {
+	msg.BaseTextMessage.SetState(state)
+	msg.cache = nil
+}
+
+func (msg *TextMessage) SetIsHighlight(isHighlight bool) {
+	msg.BaseTextMessage.SetIsHighlight(isHighlight)
+	msg.cache = nil
+}
+
+func (msg *TextMessage) SetIsService(isService bool) {
+	msg.BaseTextMessage.SetIsService(isService)
+	msg.cache = nil
+}
+
+func (msg *TextMessage) NotificationContent() string {
+	return msg.MsgText
+}
+
+func (msg *TextMessage) CalculateBuffer(width int) {
+	msg.BaseTextMessage.calculateBufferWithText(msg.getCache(), width)
+}
+
+// RecalculateBuffer calculates the buffer again with the previously provided width.
+func (msg *TextMessage) RecalculateBuffer() {
+	msg.CalculateBuffer(msg.prevBufferWidth)
+}

ui/messages/tstring/cell.go

@@ -0,0 +1,51 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package tstring
+
+import (
+	"maunium.net/go/tcell"
+	"github.com/mattn/go-runewidth"
+)
+
+type Cell struct {
+	Char  rune
+	Style tcell.Style
+}
+
+func NewStyleCell(char rune, style tcell.Style) Cell {
+	return Cell{char, style}
+}
+
+func NewColorCell(char rune, color tcell.Color) Cell {
+	return Cell{char, tcell.StyleDefault.Foreground(color)}
+}
+
+func NewCell(char rune) Cell {
+	return Cell{char, tcell.StyleDefault}
+}
+
+func (cell Cell) RuneWidth() int {
+	return runewidth.RuneWidth(cell.Char)
+}
+
+func (cell Cell) Draw(screen tcell.Screen, x, y int) (chWidth int) {
+	chWidth = cell.RuneWidth()
+	for runeWidthOffset := 0; runeWidthOffset < chWidth; runeWidthOffset++ {
+		screen.SetContent(x+runeWidthOffset, y, cell.Char, nil, cell.Style)
+	}
+	return
+}

ui/messages/tstring/string.go

@@ -0,0 +1,173 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package tstring
+
+import (
+	"strings"
+
+	"github.com/mattn/go-runewidth"
+	"maunium.net/go/tcell"
+)
+
+type TString []Cell
+
+func NewBlankTString() TString {
+	return make([]Cell, 0)
+}
+
+func NewTString(str string) TString {
+	newStr := make([]Cell, len(str))
+	for i, char := range str {
+		newStr[i] = NewCell(char)
+	}
+	return newStr
+}
+
+func NewColorTString(str string, color tcell.Color) TString {
+	newStr := make([]Cell, len(str))
+	for i, char := range str {
+		newStr[i] = NewColorCell(char, color)
+	}
+	return newStr
+}
+
+func NewStyleTString(str string, style tcell.Style) TString {
+	newStr := make([]Cell, len(str))
+	for i, char := range str {
+		newStr[i] = NewStyleCell(char, style)
+	}
+	return newStr
+}
+
+func (str TString) AppendTString(data TString) TString {
+	return append(str, data...)
+}
+
+func (str TString) Append(data string) TString {
+	newStr := make(TString, len(str)+len(data))
+	copy(newStr, str)
+	for i, char := range data {
+		newStr[i+len(str)] = NewCell(char)
+	}
+	return newStr
+}
+
+func (str TString) AppendColor(data string, color tcell.Color) TString {
+	newStr := make(TString, len(str)+len(data))
+	copy(newStr, str)
+	for i, char := range data {
+		newStr[i+len(str)] = NewColorCell(char, color)
+	}
+	return newStr
+}
+
+func (str TString) AppendStyle(data string, style tcell.Style) TString {
+	newStr := make(TString, len(str)+len(data))
+	copy(newStr, str)
+	for i, char := range data {
+		newStr[i+len(str)] = NewStyleCell(char, style)
+	}
+	return newStr
+}
+
+func (str TString) Colorize(from, length int, color tcell.Color) {
+	for i := from; i < from+length; i++ {
+		str[i].Style = str[i].Style.Foreground(color)
+	}
+}
+
+func (str TString) Draw(screen tcell.Screen, x, y int) {
+	offsetX := 0
+	for _, cell := range str {
+		offsetX += cell.Draw(screen, x+offsetX, y)
+	}
+}
+
+func (str TString) RuneWidth() (width int) {
+	for _, cell := range str {
+		width += runewidth.RuneWidth(cell.Char)
+	}
+	return width
+}
+
+func (str TString) String() string {
+	var buf strings.Builder
+	for _, cell := range str {
+		buf.WriteRune(cell.Char)
+	}
+	return buf.String()
+}
+
+// Truncate return string truncated with w cells
+func (str TString) Truncate(w int) TString {
+	if str.RuneWidth() <= w {
+		return str[:]
+	}
+	width := 0
+	i := 0
+	for ; i < len(str); i++ {
+		cw := runewidth.RuneWidth(str[i].Char)
+		if width+cw > w {
+			break
+		}
+		width += cw
+	}
+	return str[0:i]
+}
+
+func (str TString) IndexFrom(r rune, from int) int {
+	for i := from; i < len(str); i++ {
+		if str[i].Char == r {
+			return i
+		}
+	}
+	return -1
+}
+
+func (str TString) Index(r rune) int {
+	return str.IndexFrom(r, 0)
+}
+
+func (str TString) Count(r rune) (counter int) {
+	index := 0
+	for {
+		index = str.IndexFrom(r, index)
+		if index < 0 {
+			break
+		}
+		index++
+		counter++
+	}
+	return
+}
+
+func (str TString) Split(sep rune) []TString {
+	a := make([]TString, str.Count(sep)+1)
+	i := 0
+	orig := str
+	for {
+		m := orig.Index(sep)
+		if m < 0 {
+			break
+		}
+		a[i] = orig[:m]
+		orig = orig[m+1:]
+		i++
+	}
+	a[i] = orig
+	return a[:i+1]
+}

ui/room-list.go

@@ -14,14 +14,15 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package widget
+package ui
 
 import (
 	"fmt"
 	"strconv"
 
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
 	"maunium.net/go/gomuks/matrix/rooms"
+	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -126,11 +127,11 @@ func (list *RoomList) Draw(screen tcell.Screen) {
 				unreadMessageCount += "!"
 			}
 			unreadMessageCount = fmt.Sprintf("(%s)", unreadMessageCount)
-			writeLine(screen, tview.AlignRight, unreadMessageCount, x+lineWidth-6, y, 6, style)
+			widget.WriteLine(screen, tview.AlignRight, unreadMessageCount, x+lineWidth-6, y, 6, style)
 			lineWidth -= len(unreadMessageCount) + 1
 		}
 
-		writeLine(screen, tview.AlignLeft, text, x, y, lineWidth, style)
+		widget.WriteLine(screen, tview.AlignLeft, text, x, y, lineWidth, style)
 
 		y++
 		if y >= bottomLimit {

ui/room-view.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package widget
+package ui
 
 import (
 	"fmt"
@@ -23,9 +23,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
+	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/types"
+	"maunium.net/go/gomuks/ui/messages"
+	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -36,8 +38,8 @@ type RoomView struct {
 	content  *MessageView
 	status   *tview.TextView
 	userList *tview.TextView
-	ulBorder *Border
+	ulBorder *widget.Border
-	input    *AdvancedInputField
+	input    *widget.AdvancedInputField
 	Room     *rooms.Room
 }
 
@@ -45,13 +47,13 @@ func NewRoomView(room *rooms.Room) *RoomView {
 	view := &RoomView{
 		Box:      tview.NewBox(),
 		topic:    tview.NewTextView(),
-		content:  NewMessageView(),
 		status:   tview.NewTextView(),
 		userList: tview.NewTextView(),
-		ulBorder: NewBorder(),
+		ulBorder: widget.NewBorder(),
-		input:    NewAdvancedInputField(),
+		input:    widget.NewAdvancedInputField(),
 		Room:     room,
 	}
+	view.content = NewMessageView(view)
 
 	view.input.
 		SetFieldBackgroundColor(tcell.ColorDefault).
@@ -79,8 +81,8 @@ func (view *RoomView) SaveHistory(dir string) error {
 	return view.MessageView().SaveHistory(view.logPath(dir))
 }
 
-func (view *RoomView) LoadHistory(dir string) (int, error) {
+func (view *RoomView) LoadHistory(gmx ifc.Gomuks, dir string) (int, error) {
-	return view.MessageView().LoadHistory(view.logPath(dir))
+	return view.MessageView().LoadHistory(gmx, view.logPath(dir))
 }
 
 func (view *RoomView) SetTabCompleteFunc(fn func(room *RoomView, text string, cursorOffset int) string) *RoomView {
@@ -129,7 +131,7 @@ func (view *RoomView) GetInputText() string {
 	return view.input.GetText()
 }
 
-func (view *RoomView) GetInputField() *AdvancedInputField {
+func (view *RoomView) GetInputField() *widget.AdvancedInputField {
 	return view.input
 }
 
@@ -230,15 +232,19 @@ func (view *RoomView) MessageView() *MessageView {
 	return view.content
 }
 
+func (view *RoomView) MxRoom() *rooms.Room {
+	return view.Room
+}
+
 func (view *RoomView) UpdateUserList() {
 	var joined strings.Builder
 	var invited strings.Builder
 	for _, user := range view.Room.GetMembers() {
 		if user.Membership == "join" {
-			joined.WriteString(AddHashColor(user.DisplayName))
+			joined.WriteString(widget.AddHashColor(user.DisplayName))
 			joined.WriteRune('\n')
 		} else if user.Membership == "invite" {
-			invited.WriteString(AddHashColor(user.DisplayName))
+			invited.WriteString(widget.AddHashColor(user.DisplayName))
 			invited.WriteRune('\n')
 		}
 	}
@@ -249,27 +255,37 @@ func (view *RoomView) UpdateUserList() {
 	}
 }
 
-func (view *RoomView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) *types.Message {
+func (view *RoomView) newUIMessage(id, sender, msgtype, text string, timestamp time.Time) messages.UIMessage {
 	member := view.Room.GetMember(sender)
 	if member != nil {
 		sender = member.DisplayName
 	}
-	return view.content.NewMessage(id, sender, msgtype, text, timestamp)
+	return messages.NewTextMessage(id, sender, msgtype, text, timestamp)
 }
 
-func (view *RoomView) NewTempMessage(msgtype, text string) *types.Message {
+func (view *RoomView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) ifc.Message {
+	return view.newUIMessage(id, sender, msgtype, text, timestamp)
+}
+
+func (view *RoomView) NewTempMessage(msgtype, text string) ifc.Message {
 	now := time.Now()
 	id := strconv.FormatInt(now.UnixNano(), 10)
 	sender := ""
 	if ownerMember := view.Room.GetSessionOwner(); ownerMember != nil {
 		sender = ownerMember.DisplayName
 	}
-	message := view.NewMessage(id, sender, msgtype, text, now)
+	message := view.newUIMessage(id, sender, msgtype, text, now)
-	message.State = types.MessageStateSending
+	message.SetState(ifc.MessageStateSending)
-	view.AddMessage(message, AppendMessage)
+	view.AddMessage(message, ifc.AppendMessage)
 	return message
 }
 
-func (view *RoomView) AddMessage(message *types.Message, direction MessageDirection) {
+func (view *RoomView) AddServiceMessage(text string) {
+	message := view.newUIMessage("", "*", "gomuks.service", text, time.Now())
+	message.SetIsService(true)
+	view.AddMessage(message, ifc.AppendMessage)
+}
+
+func (view *RoomView) AddMessage(message ifc.Message, direction ifc.MessageDirection) {
 	view.content.AddMessage(message, direction)
 }

ui/types/doc.go

@@ -1,2 +0,0 @@
-// Package types contains common type definitions used mostly by the UI, but also other parts of gomuks.
-package types

ui/types/message.go

@@ -1,234 +0,0 @@
-// gomuks - A terminal Matrix client written in Go.
-// Copyright (C) 2018 Tulir Asokan
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package types
-
-import (
-	"fmt"
-	"regexp"
-	"strings"
-
-	"github.com/gdamore/tcell"
-	"github.com/mattn/go-runewidth"
-)
-
-// MessageState is an enum to specify if a Message is being sent, failed to send or was successfully sent.
-type MessageState int
-
-// Allowed MessageStates.
-const (
-	MessageStateSending MessageState = iota
-	MessageStateDefault
-	MessageStateFailed
-)
-
-// Message is a wrapper for the content and metadata of a Matrix message intended to be displayed.
-type Message struct {
-	ID              string
-	Type            string
-	Sender          string
-	SenderColor     tcell.Color
-	TextColor       tcell.Color
-	Timestamp       string
-	Date            string
-	Text            string
-	State           MessageState
-	buffer          []string
-	prevBufferWidth int
-}
-
-// NewMessage creates a new Message object with the provided values and the default state.
-func NewMessage(id, sender, msgtype, text, timestamp, date string, senderColor tcell.Color) *Message {
-	return &Message{
-		Sender:          sender,
-		Timestamp:       timestamp,
-		Date:            date,
-		SenderColor:     senderColor,
-		TextColor:       tcell.ColorDefault,
-		Type:            msgtype,
-		Text:            text,
-		ID:              id,
-		prevBufferWidth: 0,
-		State:           MessageStateDefault,
-	}
-}
-
-// CopyTo copies the content of this message to the given message.
-func (message *Message) CopyTo(to *Message) {
-	to.ID = message.ID
-	to.Type = message.Type
-	to.Sender = message.Sender
-	to.SenderColor = message.SenderColor
-	to.TextColor = message.TextColor
-	to.Timestamp = message.Timestamp
-	to.Date = message.Date
-	to.Text = message.Text
-	to.State = message.State
-	to.RecalculateBuffer()
-}
-
-// GetSender gets the string that should be displayed as the sender of this message.
-//
-// If the message is being sent, the sender is "Sending...".
-// If sending has failed, the sender is "Error".
-// If the message is an emote, the sender is blank.
-// In any other case, the sender is the display name of the user who sent the message.
-func (message *Message) GetSender() string {
-	switch message.State {
-	case MessageStateSending:
-		return "Sending..."
-	case MessageStateFailed:
-		return "Error"
-	}
-	switch message.Type {
-	case "m.emote":
-		// Emotes don't show a separate sender, it's included in the buffer.
-		return ""
-	default:
-		return message.Sender
-	}
-}
-
-func (message *Message) getStateSpecificColor() tcell.Color {
-	switch message.State {
-	case MessageStateSending:
-		return tcell.ColorGray
-	case MessageStateFailed:
-		return tcell.ColorRed
-	case MessageStateDefault:
-		fallthrough
-	default:
-		return tcell.ColorDefault
-	}
-}
-
-// GetSenderColor returns the color the name of the sender should be shown in.
-//
-// If the message is being sent, the color is gray.
-// If sending has failed, the color is red.
-//
-// In any other case, the color is whatever is specified in the Message struct.
-// Usually that means it is the hash-based color of the sender (see ui/widget/color.go)
-func (message *Message) GetSenderColor() (color tcell.Color) {
-	color = message.getStateSpecificColor()
-	if color == tcell.ColorDefault {
-		color = message.SenderColor
-	}
-	return
-}
-
-// GetTextColor returns the color the actual content of the message should be shown in.
-//
-// This returns the same colors as GetSenderColor(), but takes the default color from a different variable.
-func (message *Message) GetTextColor() (color tcell.Color) {
-	color = message.getStateSpecificColor()
-	if color == tcell.ColorDefault {
-		color = message.TextColor
-	}
-	return
-}
-
-// GetTimestampColor returns the color the timestamp should be shown in.
-//
-// As with GetSenderColor(), messages being sent and messages that failed to be sent are
-// gray and red respectively.
-//
-// However, other messages are the default color instead of a color stored in the struct.
-func (message *Message) GetTimestampColor() tcell.Color {
-	return message.getStateSpecificColor()
-}
-
-// RecalculateBuffer calculates the buffer again with the previously provided width.
-func (message *Message) RecalculateBuffer() {
-	message.CalculateBuffer(message.prevBufferWidth)
-}
-
-// Buffer returns the computed text buffer.
-//
-// The buffer contains the text of the message split into lines with a maximum
-// width of whatever was provided to CalculateBuffer().
-//
-// N.B. This will NOT automatically calculate the buffer if it hasn't been
-//      calculated already, as that requires the target width.
-func (message *Message) Buffer() []string {
-	return message.buffer
-}
-
-// Height returns the number of rows in the computed buffer (see Buffer()).
-func (message *Message) Height() int {
-	return len(message.buffer)
-}
-
-// GetTimestamp returns the formatted time when the message was sent.
-func (message *Message) GetTimestamp() string {
-	return message.Timestamp
-}
-
-// GetDate returns the formatted date when the message was sent.
-func (message *Message) GetDate() string {
-	return message.Date
-}
-
-// Regular expressions used to split lines when calculating the buffer.
-//
-// From tview/textview.go
-var (
-	boundaryPattern = regexp.MustCompile("([[:punct:]]\\s*|\\s+)")
-	spacePattern    = regexp.MustCompile(`\s+`)
-)
-
-// CalculateBuffer generates the internal buffer for this message that consists
-// of the text of this message split into lines at most as wide as the width
-// parameter.
-func (message *Message) CalculateBuffer(width int) {
-	if width < 2 {
-		return
-	}
-
-	message.buffer = []string{}
-	text := message.Text
-	if message.Type == "m.emote" {
-		text = fmt.Sprintf("* %s %s", message.Sender, message.Text)
-	}
-
-	forcedLinebreaks := strings.Split(text, "\n")
-	newlines := 0
-	for _, str := range forcedLinebreaks {
-		if len(str) == 0 && newlines < 1 {
-			message.buffer = append(message.buffer, "")
-			newlines++
-		} else {
-			newlines = 0
-		}
-		// From tview/textview.go#reindexBuffer()
-		for len(str) > 0 {
-			extract := runewidth.Truncate(str, width, "")
-			if len(extract) < len(str) {
-				if spaces := spacePattern.FindStringIndex(str[len(extract):]); spaces != nil && spaces[0] == 0 {
-					extract = str[:len(extract)+spaces[1]]
-				}
-
-				matches := boundaryPattern.FindAllStringIndex(extract, -1)
-				if len(matches) > 0 {
-					extract = extract[:matches[len(matches)-1][1]]
-				}
-			}
-			message.buffer = append(message.buffer, extract)
-			str = str[len(extract):]
-		}
-	}
-	message.prevBufferWidth = width
-}

ui/types/meta.go

@@ -1,71 +0,0 @@
-// gomuks - A terminal Matrix client written in Go.
-// Copyright (C) 2018 Tulir Asokan
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package types
-
-import (
-	"github.com/gdamore/tcell"
-)
-
-// MessageMeta is an interface to get the metadata of a message.
-//
-// See BasicMeta for a simple implementation and documentation of methods.
-type MessageMeta interface {
-	GetSender() string
-	GetSenderColor() tcell.Color
-	GetTextColor() tcell.Color
-	GetTimestampColor() tcell.Color
-	GetTimestamp() string
-	GetDate() string
-}
-
-// BasicMeta is a simple variable store implementation of MessageMeta.
-type BasicMeta struct {
-	Sender, Timestamp, Date                string
-	SenderColor, TextColor, TimestampColor tcell.Color
-}
-
-// GetSender gets the string that should be displayed as the sender of this message.
-func (meta *BasicMeta) GetSender() string {
-	return meta.Sender
-}
-
-// GetSenderColor returns the color the name of the sender should be shown in.
-func (meta *BasicMeta) GetSenderColor() tcell.Color {
-	return meta.SenderColor
-}
-
-// GetTimestamp returns the formatted time when the message was sent.
-func (meta *BasicMeta) GetTimestamp() string {
-	return meta.Timestamp
-}
-
-// GetDate returns the formatted date when the message was sent.
-func (meta *BasicMeta) GetDate() string {
-	return meta.Date
-}
-
-// GetTextColor returns the color the actual content of the message should be shown in.
-func (meta *BasicMeta) GetTextColor() tcell.Color {
-	return meta.TextColor
-}
-
-// GetTimestampColor returns the color the timestamp should be shown in.
-//
-// This usually does not apply to the date, as it is rendered separately from the message.
-func (meta *BasicMeta) GetTimestampColor() tcell.Color {
-	return meta.TimestampColor
-}

ui/ui.go

@@ -17,7 +17,7 @@
 package ui
 
 import (
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
 	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/tview"
 )

ui/view-login.go

@@ -19,7 +19,7 @@ package ui
 import (
 	"maunium.net/go/gomuks/config"
 	"maunium.net/go/gomuks/interface"
-	"maunium.net/go/gomuks/ui/debug"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )

ui/view-main.go

@@ -23,26 +23,26 @@ import (
 	"time"
 	"unicode"
 
-	"github.com/gdamore/tcell"
 	"github.com/mattn/go-runewidth"
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/config"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/lib/notification"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/notification"
+	"maunium.net/go/gomuks/ui/messages/parser"
-	"maunium.net/go/gomuks/ui/debug"
-	"maunium.net/go/gomuks/ui/types"
 	"maunium.net/go/gomuks/ui/widget"
+	"maunium.net/go/tcell"
 	"maunium.net/go/tview"
 )
 
 type MainView struct {
 	*tview.Flex
 
-	roomList         *widget.RoomList
+	roomList         *RoomList
 	roomView         *tview.Pages
-	rooms            map[string]*widget.RoomView
+	rooms            map[string]*RoomView
 	currentRoomIndex int
 	roomIDs          []string
 
@@ -57,9 +57,9 @@ type MainView struct {
 func (ui *GomuksUI) NewMainView() tview.Primitive {
 	mainView := &MainView{
 		Flex:     tview.NewFlex(),
-		roomList: widget.NewRoomList(),
+		roomList: NewRoomList(),
 		roomView: tview.NewPages(),
-		rooms:    make(map[string]*widget.RoomView),
+		rooms:    make(map[string]*RoomView),
 
 		matrix: ui.gmx.Matrix(),
 		gmx:    ui.gmx,
@@ -81,7 +81,7 @@ func (view *MainView) BumpFocus() {
 	view.lastFocusTime = time.Now()
 }
 
-func (view *MainView) InputChanged(roomView *widget.RoomView, text string) {
+func (view *MainView) InputChanged(roomView *RoomView, text string) {
 	if len(text) == 0 {
 		go view.matrix.SendTyping(roomView.Room.ID, false)
 	} else if text[0] != '/' {
@@ -101,7 +101,7 @@ func findWordToTabComplete(text string) string {
 	return output
 }
 
-func (view *MainView) InputTabComplete(roomView *widget.RoomView, text string, cursorOffset int) string {
+func (view *MainView) InputTabComplete(roomView *RoomView, text string, cursorOffset int) string {
 	str := runewidth.Truncate(text, cursorOffset, "")
 	word := findWordToTabComplete(str)
 	userCompletions := roomView.AutocompleteUser(word)
@@ -118,7 +118,7 @@ func (view *MainView) InputTabComplete(roomView *widget.RoomView, text string, c
 	return text
 }
 
-func (view *MainView) InputSubmit(roomView *widget.RoomView, text string) {
+func (view *MainView) InputSubmit(roomView *RoomView, text string) {
 	if len(text) == 0 {
 		return
 	} else if text[0] == '/' {
@@ -132,29 +132,30 @@ func (view *MainView) InputSubmit(roomView *widget.RoomView, text string) {
 	roomView.SetInputText("")
 }
 
-func (view *MainView) SendMessage(roomView *widget.RoomView, text string) {
+func (view *MainView) SendMessage(roomView *RoomView, text string) {
 	tempMessage := roomView.NewTempMessage("m.text", text)
-	go view.sendTempMessage(roomView, tempMessage)
+	go view.sendTempMessage(roomView, tempMessage, text)
 }
 
-func (view *MainView) sendTempMessage(roomView *widget.RoomView, tempMessage *types.Message) {
+func (view *MainView) sendTempMessage(roomView *RoomView, tempMessage ifc.Message, text string) {
 	defer view.gmx.Recover()
-	eventID, err := view.matrix.SendMessage(roomView.Room.ID, tempMessage.Type, tempMessage.Text)
+	eventID, err := view.matrix.SendMessage(roomView.Room.ID, tempMessage.Type(), text)
 	if err != nil {
-		tempMessage.State = types.MessageStateFailed
+		tempMessage.SetState(ifc.MessageStateFailed)
 		roomView.SetStatus(fmt.Sprintf("Failed to send message: %s", err))
 	} else {
 		roomView.MessageView().UpdateMessageID(tempMessage, eventID)
 	}
 }
 
-func (view *MainView) HandleCommand(roomView *widget.RoomView, command string, args []string) {
+func (view *MainView) HandleCommand(roomView *RoomView, command string, args []string) {
 	defer view.gmx.Recover()
 	debug.Print("Handling command", command, args)
 	switch command {
 	case "/me":
-		tempMessage := roomView.NewTempMessage("m.emote", strings.Join(args, " "))
+		text := strings.Join(args, " ")
-		go view.sendTempMessage(roomView, tempMessage)
+		tempMessage := roomView.NewTempMessage("m.emote", text)
+		go view.sendTempMessage(roomView, tempMessage, text)
 		view.parent.Render()
 	case "/quit":
 		view.gmx.Stop()
@@ -163,22 +164,20 @@ func (view *MainView) HandleCommand(roomView *widget.RoomView, command string, a
 		view.gmx.Stop()
 	case "/panic":
 		panic("This is a test panic.")
-	case "/part":
+	case "/part", "/leave":
-		fallthrough
-	case "/leave":
 		debug.Print("Leave room result:", view.matrix.LeaveRoom(roomView.Room.ID))
 	case "/join":
 		if len(args) == 0 {
-			view.AddServiceMessage(roomView, "Usage: /join <room>")
+			roomView.AddServiceMessage("Usage: /join <room>")
 			break
 		}
 		debug.Print("Join room result:", view.matrix.JoinRoom(args[0]))
 	default:
-		view.AddServiceMessage(roomView, "Unknown command.")
+		roomView.AddServiceMessage("Unknown command.")
 	}
 }
 
-func (view *MainView) KeyEventHandler(roomView *widget.RoomView, key *tcell.EventKey) *tcell.EventKey {
+func (view *MainView) KeyEventHandler(roomView *RoomView, key *tcell.EventKey) *tcell.EventKey {
 	view.BumpFocus()
 
 	k := key.Key()
@@ -220,8 +219,8 @@ func (view *MainView) KeyEventHandler(roomView *widget.RoomView, key *tcell.Even
 
 const WheelScrollOffsetDiff = 3
 
-func (view *MainView) MouseEventHandler(roomView *widget.RoomView, event *tcell.EventMouse) *tcell.EventMouse {
+func (view *MainView) MouseEventHandler(roomView *RoomView, event *tcell.EventMouse) *tcell.EventMouse {
-	if event.Buttons() == tcell.ButtonNone {
+	if event.Buttons() == tcell.ButtonNone || event.HasMotion() {
 		return event
 	}
 	view.BumpFocus()
@@ -247,7 +246,14 @@ func (view *MainView) MouseEventHandler(roomView *widget.RoomView, event *tcell.
 			roomView.Room.MarkRead()
 		}
 	default:
+		mx, my, mw, mh := msgView.GetRect()
+		if x >= mx && y >= my && x < mx+mw && y < my+mh {
+			if msgView.HandleClick(x-mx, y-my, event.Buttons()) {
+				view.parent.Render()
+			}
+		} else {
 			debug.Print("Mouse event received:", event.Buttons(), event.Modifiers(), x, y)
+		}
 		return event
 	}
 
@@ -300,7 +306,7 @@ func (view *MainView) addRoom(index int, room string) {
 
 	view.roomList.Add(roomStore)
 	if !view.roomView.HasPage(room) {
-		roomView := widget.NewRoomView(roomStore).
+		roomView := NewRoomView(roomStore).
 			SetInputSubmitFunc(view.InputSubmit).
 			SetInputChangedFunc(view.InputChanged).
 			SetTabCompleteFunc(view.InputTabComplete).
@@ -310,7 +316,7 @@ func (view *MainView) addRoom(index int, room string) {
 		view.roomView.AddPage(room, roomView, true, false)
 		roomView.UpdateUserList()
 
-		count, err := roomView.LoadHistory(view.config.HistoryDir)
+		count, err := roomView.LoadHistory(view.gmx, view.config.HistoryDir)
 		if err != nil {
 			debug.Printf("Failed to load history of %s: %v", roomView.Room.GetTitle(), err)
 		} else if count <= 0 {
@@ -319,7 +325,7 @@ func (view *MainView) addRoom(index int, room string) {
 	}
 }
 
-func (view *MainView) GetRoom(id string) *widget.RoomView {
+func (view *MainView) GetRoom(id string) ifc.RoomView {
 	return view.rooms[id]
 }
 
@@ -352,7 +358,7 @@ func (view *MainView) RemoveRoom(room string) {
 	} else {
 		removeIndex = sort.StringSlice(view.roomIDs).Search(room)
 	}
-	view.roomList.Remove(roomView.Room)
+	view.roomList.Remove(roomView.MxRoom())
 	view.roomIDs = append(view.roomIDs[:removeIndex], view.roomIDs[removeIndex+1:]...)
 	view.roomView.RemovePage(room)
 	delete(view.rooms, room)
@@ -363,7 +369,7 @@ func (view *MainView) SetRooms(rooms []string) {
 	view.roomIDs = rooms
 	view.roomList.Clear()
 	view.roomView.Clear()
-	view.rooms = make(map[string]*widget.RoomView)
+	view.rooms = make(map[string]*RoomView)
 	for index, room := range rooms {
 		view.addRoom(index, room)
 	}
@@ -385,14 +391,14 @@ func sendNotification(room *rooms.Room, sender, text string, critical, sound boo
 	notification.Send(sender, text, critical, sound)
 }
 
-func (view *MainView) NotifyMessage(room *rooms.Room, message *types.Message, should pushrules.PushActionArrayShould) {
+func (view *MainView) NotifyMessage(room *rooms.Room, message ifc.Message, should pushrules.PushActionArrayShould) {
 	// Whether or not the room where the message came is the currently shown room.
 	isCurrent := room.ID == view.CurrentRoomID()
 	// Whether or not the terminal window is focused.
 	isFocused := view.lastFocusTime.Add(30 * time.Second).Before(time.Now())
 
 	// Whether or not the push rules say this message should be notified about.
-	shouldNotify := (should.Notify || !should.NotifySpecified) && message.Sender != view.config.Session.UserID
+	shouldNotify := (should.Notify || !should.NotifySpecified) && message.Sender() != view.config.Session.UserID
 
 	if !isCurrent {
 		// The message is not in the current room, show new message status in room list.
@@ -406,21 +412,10 @@ func (view *MainView) NotifyMessage(room *rooms.Room, message *types.Message, sh
 	if shouldNotify && !isFocused {
 		// Push rules say notify and the terminal is not focused, send desktop notification.
 		shouldPlaySound := should.PlaySound && should.SoundName == "default"
-		sendNotification(room, message.Sender, message.Text, should.Highlight, shouldPlaySound)
+		sendNotification(room, message.Sender(), message.NotificationContent(), should.Highlight, shouldPlaySound)
 	}
 
-	if should.Highlight {
+	message.SetIsHighlight(should.Highlight)
-		// Message is highlight, set color.
-		message.TextColor = tcell.ColorYellow
-	}
-}
-
-func (view *MainView) AddServiceMessage(roomView *widget.RoomView, text string) {
-	message := roomView.NewMessage("", "*", "gomuks.service", text, time.Now())
-	message.TextColor = tcell.ColorGray
-	message.SenderColor = tcell.ColorGray
-	roomView.AddMessage(message, widget.AppendMessage)
-	view.parent.Render()
 }
 
 func (view *MainView) LoadHistory(room string, initial bool) {
@@ -452,20 +447,15 @@ func (view *MainView) LoadHistory(room string, initial bool) {
 	}
 	history, prevBatch, err := view.matrix.GetHistory(roomView.Room.ID, batch, 50)
 	if err != nil {
-		view.AddServiceMessage(roomView, "Failed to fetch history")
+		roomView.AddServiceMessage("Failed to fetch history")
 		debug.Print("Failed to fetch history for", roomView.Room.ID, err)
 		return
 	}
 	roomView.Room.PrevBatch = prevBatch
 	for _, evt := range history {
-		var message *types.Message
+		message := view.ParseEvent(roomView, &evt)
-		if evt.Type == "m.room.message" {
-			message = view.ProcessMessageEvent(roomView, &evt)
-		} else if evt.Type == "m.room.member" {
-			message = view.ProcessMembershipEvent(roomView, &evt)
-		}
 		if message != nil {
-			roomView.AddMessage(message, widget.PrependMessage)
+			roomView.AddMessage(message, ifc.PrependMessage)
 		}
 	}
 	err = roomView.SaveHistory(view.config.HistoryDir)
@@ -476,63 +466,6 @@ func (view *MainView) LoadHistory(room string, initial bool) {
 	view.parent.Render()
 }
 
-func (view *MainView) ProcessMessageEvent(room *widget.RoomView, evt *gomatrix.Event) (message *types.Message) {
+func (view *MainView) ParseEvent(roomView ifc.RoomView, evt *gomatrix.Event) ifc.Message {
-	text, _ := evt.Content["body"].(string)
+	return parser.ParseEvent(view.gmx, roomView.MxRoom(), evt)
-	msgtype, _ := evt.Content["msgtype"].(string)
-	return room.NewMessage(evt.ID, evt.Sender, msgtype, text, unixToTime(evt.Timestamp))
-}
-
-func (view *MainView) getMembershipEventContent(evt *gomatrix.Event) (sender, text string) {
-	membership, _ := evt.Content["membership"].(string)
-	displayname, _ := evt.Content["displayname"].(string)
-	if len(displayname) == 0 {
-		displayname = *evt.StateKey
-	}
-	prevMembership := "leave"
-	prevDisplayname := ""
-	if evt.Unsigned.PrevContent != nil {
-		prevMembership, _ = evt.Unsigned.PrevContent["membership"].(string)
-		prevDisplayname, _ = evt.Unsigned.PrevContent["displayname"].(string)
-	}
-
-	if membership != prevMembership {
-		switch membership {
-		case "invite":
-			sender = "---"
-			text = fmt.Sprintf("%s invited %s.", evt.Sender, displayname)
-		case "join":
-			sender = "-->"
-			text = fmt.Sprintf("%s joined the room.", displayname)
-		case "leave":
-			sender = "<--"
-			if evt.Sender != *evt.StateKey {
-				reason, _ := evt.Content["reason"].(string)
-				text = fmt.Sprintf("%s kicked %s: %s", evt.Sender, displayname, reason)
-			} else {
-				text = fmt.Sprintf("%s left the room.", displayname)
-			}
-		}
-	} else if displayname != prevDisplayname {
-		sender = "---"
-		text = fmt.Sprintf("%s changed their display name to %s.", prevDisplayname, displayname)
-	}
-	return
-}
-
-func (view *MainView) ProcessMembershipEvent(room *widget.RoomView, evt *gomatrix.Event) (message *types.Message) {
-	sender, text := view.getMembershipEventContent(evt)
-	if len(text) == 0 {
-		return
-	}
-	message = room.NewMessage(evt.ID, sender, "m.room.member", text, unixToTime(evt.Timestamp))
-	message.TextColor = tcell.ColorGreen
-	return
-}
-
-func unixToTime(unix int64) time.Time {
-	timestamp := time.Now()
-	if unix != 0 {
-		timestamp = time.Unix(unix/1000, unix%1000*1000)
-	}
-	return timestamp
 }

ui/widget/advanced-inputfield.go

@@ -24,7 +24,7 @@ import (
 	"strings"
 	"unicode/utf8"
 
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
 	"github.com/mattn/go-runewidth"
 	"github.com/zyedidia/clipboard"
 	"maunium.net/go/tview"

ui/widget/border.go

@@ -17,7 +17,7 @@
 package widget
 
 import (
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
 	"maunium.net/go/tview"
 )
 

ui/widget/color.go

@@ -21,7 +21,7 @@ import (
 	"hash/fnv"
 	"sort"
 
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
 )
 
 var colorNames []string

ui/widget/message-view.go

@@ -1,354 +0,0 @@
-// gomuks - A terminal Matrix client written in Go.
-// Copyright (C) 2018 Tulir Asokan
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package widget
-
-import (
-	"encoding/gob"
-	"fmt"
-	"math"
-	"os"
-	"time"
-
-	"github.com/gdamore/tcell"
-	"maunium.net/go/gomuks/ui/debug"
-	"maunium.net/go/gomuks/ui/types"
-	"maunium.net/go/tview"
-)
-
-type MessageView struct {
-	*tview.Box
-
-	ScrollOffset    int
-	MaxSenderWidth  int
-	DateFormat      string
-	TimestampFormat string
-	TimestampWidth  int
-	LoadingMessages bool
-
-	widestSender int
-	prevWidth    int
-	prevHeight   int
-	prevMsgCount int
-
-	messageIDs map[string]*types.Message
-	messages   []*types.Message
-
-	textBuffer []string
-	metaBuffer []types.MessageMeta
-}
-
-func NewMessageView() *MessageView {
-	return &MessageView{
-		Box:             tview.NewBox(),
-		MaxSenderWidth:  15,
-		DateFormat:      "January _2, 2006",
-		TimestampFormat: "15:04:05",
-		TimestampWidth:  8,
-		ScrollOffset:    0,
-
-		messages:   make([]*types.Message, 0),
-		messageIDs: make(map[string]*types.Message),
-		textBuffer: make([]string, 0),
-		metaBuffer: make([]types.MessageMeta, 0),
-
-		widestSender: 5,
-		prevWidth:    -1,
-		prevHeight:   -1,
-		prevMsgCount: -1,
-	}
-}
-
-func (view *MessageView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) *types.Message {
-	return types.NewMessage(id, sender, msgtype, text,
-		timestamp.Format(view.TimestampFormat),
-		timestamp.Format(view.DateFormat),
-		GetHashColor(sender))
-}
-
-func (view *MessageView) SaveHistory(path string) error {
-	file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	enc := gob.NewEncoder(file)
-	err = enc.Encode(view.messages)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (view *MessageView) LoadHistory(path string) (int, error) {
-	file, err := os.OpenFile(path, os.O_RDONLY, 0600)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return 0, nil
-		}
-		return -1, err
-	}
-	defer file.Close()
-
-	dec := gob.NewDecoder(file)
-	err = dec.Decode(&view.messages)
-	if err != nil {
-		return -1, err
-	}
-
-	for _, message := range view.messages {
-		view.updateWidestSender(message.Sender)
-	}
-
-	return len(view.messages), nil
-}
-
-func (view *MessageView) updateWidestSender(sender string) {
-	if len(sender) > view.widestSender {
-		view.widestSender = len(sender)
-		if view.widestSender > view.MaxSenderWidth {
-			view.widestSender = view.MaxSenderWidth
-		}
-	}
-}
-
-type MessageDirection int
-
-const (
-	AppendMessage MessageDirection = iota
-	PrependMessage
-	IgnoreMessage
-)
-
-func (view *MessageView) UpdateMessageID(message *types.Message, newID string) {
-	delete(view.messageIDs, message.ID)
-	message.ID = newID
-	view.messageIDs[message.ID] = message
-}
-
-func (view *MessageView) AddMessage(message *types.Message, direction MessageDirection) {
-	if message == nil {
-		return
-	}
-
-	msg, messageExists := view.messageIDs[message.ID]
-	if msg != nil && messageExists {
-		message.CopyTo(msg)
-		message = msg
-		direction = IgnoreMessage
-	}
-
-	view.updateWidestSender(message.Sender)
-
-	_, _, width, _ := view.GetInnerRect()
-	width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
-	message.CalculateBuffer(width)
-
-	if direction == AppendMessage {
-		if view.ScrollOffset > 0 {
-			view.ScrollOffset += message.Height()
-		}
-		view.messages = append(view.messages, message)
-		view.appendBuffer(message)
-	} else if direction == PrependMessage {
-		view.messages = append([]*types.Message{message}, view.messages...)
-	}
-
-	view.messageIDs[message.ID] = message
-}
-
-func (view *MessageView) appendBuffer(message *types.Message) {
-	if len(view.metaBuffer) > 0 {
-		prevMeta := view.metaBuffer[len(view.metaBuffer)-1]
-		if prevMeta != nil && prevMeta.GetDate() != message.Date {
-			view.textBuffer = append(view.textBuffer, fmt.Sprintf("Date changed to %s", message.Date))
-			view.metaBuffer = append(view.metaBuffer, &types.BasicMeta{TextColor: tcell.ColorGreen})
-		}
-	}
-
-	view.textBuffer = append(view.textBuffer, message.Buffer()...)
-	for range message.Buffer() {
-		view.metaBuffer = append(view.metaBuffer, message)
-	}
-	view.prevMsgCount++
-}
-
-func (view *MessageView) recalculateBuffers() {
-	_, _, width, height := view.GetInnerRect()
-
-	width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
-	recalculateMessageBuffers := width != view.prevWidth
-	if height != view.prevHeight || recalculateMessageBuffers || len(view.messages) != view.prevMsgCount {
-		view.textBuffer = []string{}
-		view.metaBuffer = []types.MessageMeta{}
-		view.prevMsgCount = 0
-		for _, message := range view.messages {
-			if recalculateMessageBuffers {
-				message.CalculateBuffer(width)
-			}
-			view.appendBuffer(message)
-		}
-		view.prevHeight = height
-		view.prevWidth = width
-	}
-}
-
-const PaddingAtTop = 5
-
-func (view *MessageView) AddScrollOffset(diff int) {
-	_, _, _, height := view.GetInnerRect()
-
-	totalHeight := len(view.textBuffer)
-	if diff >= 0 && view.ScrollOffset+diff >= totalHeight-height+PaddingAtTop {
-		view.ScrollOffset = totalHeight - height + PaddingAtTop
-	} else {
-		view.ScrollOffset += diff
-	}
-
-	if view.ScrollOffset > totalHeight-height+PaddingAtTop {
-		view.ScrollOffset = totalHeight - height + PaddingAtTop
-	}
-	if view.ScrollOffset < 0 {
-		view.ScrollOffset = 0
-	}
-}
-
-func (view *MessageView) Height() int {
-	_, _, _, height := view.GetInnerRect()
-	return height
-}
-
-func (view *MessageView) TotalHeight() int {
-	return len(view.textBuffer)
-}
-
-func (view *MessageView) IsAtTop() bool {
-	_, _, _, height := view.GetInnerRect()
-	totalHeight := len(view.textBuffer)
-	return view.ScrollOffset >= totalHeight-height+PaddingAtTop
-}
-
-const (
-	TimestampSenderGap = 1
-	SenderSeparatorGap = 1
-	SenderMessageGap   = 3
-)
-
-func getScrollbarStyle(scrollbarHere, isTop, isBottom bool) (char rune, style tcell.Style) {
-	char = '│'
-	style = tcell.StyleDefault
-	if scrollbarHere {
-		style = style.Foreground(tcell.ColorGreen)
-	}
-	if isTop {
-		if scrollbarHere {
-			char = '╥'
-		} else {
-			char = '┬'
-		}
-	} else if isBottom {
-		if scrollbarHere {
-			char = '╨'
-		} else {
-			char = '┴'
-		}
-	} else if scrollbarHere {
-		char = '║'
-	}
-	return
-}
-
-func (view *MessageView) Draw(screen tcell.Screen) {
-	view.Box.Draw(screen)
-
-	x, y, _, height := view.GetInnerRect()
-	view.recalculateBuffers()
-
-	if len(view.textBuffer) == 0 {
-		writeLineSimple(screen, "It's quite empty in here.", x, y+height)
-		return
-	}
-
-	usernameX := x + view.TimestampWidth + TimestampSenderGap
-	messageX := usernameX + view.widestSender + SenderMessageGap
-	separatorX := usernameX + view.widestSender + SenderSeparatorGap
-
-	indexOffset := len(view.textBuffer) - view.ScrollOffset - height
-	if indexOffset <= -PaddingAtTop {
-		message := "Scroll up to load more messages."
-		if view.LoadingMessages {
-			message = "Loading more messages..."
-		}
-		writeLineSimpleColor(screen, message, messageX, y, tcell.ColorGreen)
-	}
-
-	if len(view.textBuffer) != len(view.metaBuffer) {
-		debug.ExtPrintf("Unexpected text/meta buffer length mismatch: %d != %d.", len(view.textBuffer), len(view.metaBuffer))
-		return
-	}
-
-	var scrollBarHeight, scrollBarPos int
-	// Black magic (aka math) used to figure out where the scroll bar should be put.
-	{
-		viewportHeight := float64(height)
-		contentHeight := float64(len(view.textBuffer))
-
-		scrollBarHeight = int(math.Ceil(viewportHeight / (contentHeight / viewportHeight)))
-
-		scrollBarPos = height - int(math.Round(float64(view.ScrollOffset)/contentHeight*viewportHeight))
-	}
-
-	var prevMeta types.MessageMeta
-	firstLine := true
-	skippedLines := 0
-
-	for line := 0; line < height; line++ {
-		index := indexOffset + line
-		if index < 0 {
-			skippedLines++
-			continue
-		} else if index >= len(view.textBuffer) {
-			break
-		}
-
-		showScrollbar := line-skippedLines >= scrollBarPos-scrollBarHeight && line-skippedLines < scrollBarPos
-		isTop := firstLine && view.ScrollOffset+height >= len(view.textBuffer)
-		isBottom := line == height-1 && view.ScrollOffset == 0
-
-		borderChar, borderStyle := getScrollbarStyle(showScrollbar, isTop, isBottom)
-
-		firstLine = false
-
-		screen.SetContent(separatorX, y+line, borderChar, nil, borderStyle)
-
-		text, meta := view.textBuffer[index], view.metaBuffer[index]
-		if meta != prevMeta {
-			if len(meta.GetTimestamp()) > 0 {
-				writeLineSimpleColor(screen, meta.GetTimestamp(), x, y+line, meta.GetTimestampColor())
-			}
-			if prevMeta == nil || meta.GetSender() != prevMeta.GetSender() {
-				writeLineColor(
-					screen, tview.AlignRight, meta.GetSender(),
-					usernameX, y+line, view.widestSender,
-					meta.GetSenderColor())
-			}
-			prevMeta = meta
-		}
-		writeLineSimpleColor(screen, text, messageX, y+line, meta.GetTextColor())
-	}
-}

ui/widget/util.go

@@ -17,24 +17,24 @@
 package widget
 
 import (
-	"github.com/gdamore/tcell"
+	"maunium.net/go/tcell"
 	"github.com/mattn/go-runewidth"
 	"maunium.net/go/tview"
 )
 
-func writeLineSimple(screen tcell.Screen, line string, x, y int) {
+func WriteLineSimple(screen tcell.Screen, line string, x, y int) {
-	writeLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault)
+	WriteLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault)
 }
 
-func writeLineSimpleColor(screen tcell.Screen, line string, x, y int, color tcell.Color) {
+func WriteLineSimpleColor(screen tcell.Screen, line string, x, y int, color tcell.Color) {
-	writeLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault.Foreground(color))
+	WriteLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault.Foreground(color))
 }
 
-func writeLineColor(screen tcell.Screen, align int, line string, x, y, maxWidth int, color tcell.Color) {
+func WriteLineColor(screen tcell.Screen, align int, line string, x, y, maxWidth int, color tcell.Color) {
-	writeLine(screen, align, line, x, y, maxWidth, tcell.StyleDefault.Foreground(color))
+	WriteLine(screen, align, line, x, y, maxWidth, tcell.StyleDefault.Foreground(color))
 }
 
-func writeLine(screen tcell.Screen, align int, line string, x, y, maxWidth int, style tcell.Style) {
+func WriteLine(screen tcell.Screen, align int, line string, x, y, maxWidth int, style tcell.Style) {
 	offsetX := 0
 	if align == tview.AlignRight {
 		offsetX = maxWidth - runewidth.StringWidth(line)