Fix non-syntax-highlighted code block newline rendering

ui/messages/htmlmessage.go

@@ -36,6 +36,10 @@ type HTMLMessage struct {
 	BaseMessage
 
 	Root HTMLEntity
+
+	FocusedBackground tcell.Color
+
+	focused bool
 }
 
 func NewHTMLMessage(id, sender, displayname string, msgtype mautrix.MessageType, root HTMLEntity, timestamp time.Time) UIMessage {
@@ -45,9 +49,21 @@ func NewHTMLMessage(id, sender, displayname string, msgtype mautrix.MessageType,
 	}
 }
 func (hw *HTMLMessage) Draw(screen mauview.Screen) {
+	if hw.focused {
+		screen.SetStyle(tcell.StyleDefault.Background(hw.FocusedBackground))
+	}
+	screen.Clear()
 	hw.Root.Draw(screen)
 }
 
+func (hw *HTMLMessage) Focus() {
+	hw.focused = true
+}
+
+func (hw *HTMLMessage) Blur() {
+	hw.focused = false
+}
+
 func (hw *HTMLMessage) OnKeyEvent(event mauview.KeyEvent) bool {
 	return false
 }
@@ -154,7 +170,7 @@ func NewListEntity(ordered bool, start int, children []HTMLEntity) *ListEntity {
 func (le *ListEntity) Draw(screen mauview.Screen) {
 	width, _ := screen.Size()
 
-	proxyScreen := &mauview.ProxyScreen{Parent: screen, OffsetX: le.Indent, Width: width - le.Indent}
+	proxyScreen := &mauview.ProxyScreen{Parent: screen, OffsetX: le.Indent, Width: width - le.Indent, Style: le.Style}
 	for i, entity := range le.Children {
 		proxyScreen.Height = entity.Height()
 		if le.Ordered {
@@ -165,6 +181,7 @@ func (le *ListEntity) Draw(screen mauview.Screen) {
 			screen.SetContent(0, proxyScreen.OffsetY, '●', nil, le.Style)
 		}
 		entity.Draw(proxyScreen)
+		proxyScreen.SetStyle(le.Style)
 		proxyScreen.OffsetY += entity.Height()
 	}
 }
@@ -173,6 +190,31 @@ func (le *ListEntity) String() string {
 	return fmt.Sprintf("&ListEntity{Ordered=%t, Start=%d, Base=%s},\n", le.Ordered, le.Start, le.BaseHTMLEntity)
 }
 
+type CodeBlockEntity struct {
+	*BaseHTMLEntity
+	Background tcell.Style
+}
+
+func NewCodeBlockEntity(children []HTMLEntity, background tcell.Style) *CodeBlockEntity {
+	return &CodeBlockEntity{
+		BaseHTMLEntity: &BaseHTMLEntity{
+			Tag:      "pre",
+			Block:    true,
+			Children: children,
+		},
+		Background: background,
+	}
+}
+
+func (ce *CodeBlockEntity) Draw(screen mauview.Screen) {
+	screen.Fill(' ', ce.Background)
+	ce.BaseHTMLEntity.Draw(screen)
+}
+
+func (ce *CodeBlockEntity) AdjustStyle(fn AdjustStyleFunc) HTMLEntity {
+	return ce
+}
+
 type BreakEntity struct {
 	*BaseHTMLEntity
 }
@@ -297,13 +339,14 @@ func (he *BaseHTMLEntity) Draw(screen mauview.Screen) {
 	}
 	if len(he.Children) > 0 {
 		prevBreak := false
-		proxyScreen := &mauview.ProxyScreen{Parent: screen, OffsetX: he.Indent, Width: width - he.Indent}
+		proxyScreen := &mauview.ProxyScreen{Parent: screen, OffsetX: he.Indent, Width: width - he.Indent, Style: he.Style}
 		for i, entity := range he.Children {
 			if i != 0 && entity.getStartX() == 0 {
 				proxyScreen.OffsetY++
 			}
 			proxyScreen.Height = entity.Height()
 			entity.Draw(proxyScreen)
+			proxyScreen.SetStyle(he.Style)
 			proxyScreen.OffsetY += entity.Height() - 1
 			_, isBreak := entity.(*BreakEntity)
 			if prevBreak && isBreak {

ui/messages/parser/htmlparser.go

@@ -221,7 +221,7 @@ func styleEntryToStyle(se chroma.StyleEntry) tcell.Style {
 }
 
 func (parser *htmlParser) syntaxHighlight(text, language string) messages.HTMLEntity {
-	lexer := lexers.Get(language)
+	lexer := lexers.Get(strings.ToLower(language))
 	if lexer == nil {
 		return nil
 	}
@@ -229,7 +229,9 @@ func (parser *htmlParser) syntaxHighlight(text, language string) messages.HTMLEn
 	if err != nil {
 		return nil
 	}
+	// TODO allow changing theme
 	style := styles.SolarizedDark
+
 	tokens := iter.Tokens()
 	children := make([]messages.HTMLEntity, len(tokens))
 	for i, token := range tokens {
@@ -245,39 +247,26 @@ func (parser *htmlParser) syntaxHighlight(text, language string) messages.HTMLEn
 			}
 		}
 	}
-	return &messages.BaseHTMLEntity{
-		Tag:      "pre",
-		Block:    true,
-		Children: children,
-	}
+	return messages.NewCodeBlockEntity(children, styleEntryToStyle(style.Get(chroma.Background)))
 }
 
 func (parser *htmlParser) codeblockToEntity(node *html.Node) messages.HTMLEntity {
-	entity := &messages.BaseHTMLEntity{
-		Tag:   "pre",
-		Block: true,
-	}
+	lang := "plaintext"
 	// TODO allow disabling syntax highlighting
 	if node.FirstChild.Type == html.ElementNode && node.FirstChild.Data == "code" {
-		text := (&messages.BaseHTMLEntity{
-			Children: parser.nodeToEntities(node.FirstChild.FirstChild, false),
-		}).PlainText()
-		attr := parser.getAttribute(node.FirstChild, "class")
-		var lang string
+		node = node.FirstChild
+		attr := parser.getAttribute(node, "class")
 		for _, class := range strings.Split(attr, " ") {
 			if strings.HasPrefix(class, "language-") {
 				lang = class[len("language-"):]
 				break
 			}
 		}
-		if len(lang) != 0 {
-			if parsed := parser.syntaxHighlight(text, lang); parsed != nil {
-				return parsed
-			}
-		}
 	}
-	entity.Children = parser.nodeToEntities(node.FirstChild, false)
-	return entity
+	text := (&messages.BaseHTMLEntity{
+		Children: parser.nodeToEntities(node.FirstChild, false),
+	}).PlainText()
+	return parser.syntaxHighlight(text, lang)
 }
 
 func (parser *htmlParser) tagNodeToEntity(node *html.Node, stripLinebreak bool) messages.HTMLEntity {
@@ -311,7 +300,7 @@ func (parser *htmlParser) singleNodeToEntity(node *html.Node, stripLinebreak boo
 	switch node.Type {
 	case html.TextNode:
 		if stripLinebreak {
-			node.Data = strings.Replace(node.Data, "\n", "", -1)
+			node.Data = strings.ReplaceAll(node.Data, "\n", "")
 		}
 		return &messages.BaseHTMLEntity{
 			Tag:  "text",
@@ -372,7 +361,7 @@ func ParseHTMLMessage(room *rooms.Room, evt *mautrix.Event, senderDisplayname st
 			Tag: "emote",
 			Children: []messages.HTMLEntity{
 				messages.NewHTMLTextEntity("* "),
-				messages.NewHTMLTextEntity("* ").AdjustStyle(AdjustStyleTextColor(widget.GetHashColor(evt.Sender))),
+				messages.NewHTMLTextEntity(senderDisplayname).AdjustStyle(AdjustStyleTextColor(widget.GetHashColor(evt.Sender))),
 				messages.NewHTMLTextEntity(" "),
 				root,
 			},