Implement copying to clipboard

"github.com/atotto/clipboard"

ui/command-processor.go

@@ -119,6 +119,7 @@ func NewCommandProcessor(parent *MainView) *CommandProcessor {
 			"react":      cmdReact,
 			"download":   cmdDownload,
 			"open":       cmdOpen,
+			"copy":       cmdCopy,
 			"sendevent":  cmdSendEvent,
 			"msendevent": cmdMSendEvent,
 			"setstate":   cmdSetState,

ui/commands.go

@@ -34,6 +34,7 @@ import (
 
 	"github.com/lucasb-eyer/go-colorful"
 	"github.com/russross/blackfriday/v2"
+	"github.com/atotto/clipboard"
 
 	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/event"
@@ -158,6 +159,7 @@ const (
 	SelectRedact                = "redact"
 	SelectDownload              = "download"
 	SelectOpen                  = "open"
+	SelectCopy                  = "copy"
 )
 
 func cmdReply(cmd *Command) {
@@ -176,6 +178,14 @@ func cmdOpen(cmd *Command) {
 	cmd.Room.StartSelecting(SelectOpen, strings.Join(cmd.Args, " "))
 }
 
+func cmdCopy(cmd *Command) {
+	if clipboard.Unsupported {
+		cmd.Reply("Clipboard unsupported.")
+	} else {
+		cmd.Room.StartSelecting(SelectCopy, strings.Join(cmd.Args, " "))
+	}
+}
+
 func cmdReact(cmd *Command) {
 	if len(cmd.Args) == 0 {
 		cmd.Reply("Usage: /react <reaction>")

ui/room-view.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/kyokomi/emoji"
 	"github.com/mattn/go-runewidth"
+	"github.com/atotto/clipboard"
 
 	"maunium.net/go/mauview"
 	"maunium.net/go/tcell"
@@ -204,6 +205,11 @@ func (view *RoomView) OnSelect(message *messages.UIMessage) {
 			}
 			go view.Download(msg.URL, path, view.selectReason == SelectOpen)
 		}
+	case SelectCopy:
+		msg, ok := message.Renderer.(*messages.TextMessage)
+		if ok {
+			go clipboard.WriteAll(msg.PlainText())
+		}
 	}
 	view.selecting = false
 	view.selectContent = ""