Merge 'delthas/dev' to support hyperlink OSC

See gdamore#468

style.go

@@ -23,9 +23,10 @@ package tcell
 //
 // To use Style, just declare a variable of its type.
 type Style struct {
-	fg    Color
-	bg    Color
-	attrs AttrMask
+	fg        Color
+	bg        Color
+	attrs     AttrMask
+	hyperlink string
 }
 
 // StyleDefault represents a default style, based upon the context.
@@ -39,19 +40,21 @@ var styleInvalid = Style{attrs: AttrInvalid}
 // as requested.  ColorDefault can be used to select the global default.
 func (s Style) Foreground(c Color) Style {
 	return Style{
-		fg:    c,
-		bg:    s.bg,
-		attrs: s.attrs,
+		fg:        c,
+		bg:        s.bg,
+		attrs:     s.attrs,
+		hyperlink: s.hyperlink,
 	}
 }
 
 // Background returns a new style based on s, with the background color set
 // as requested.  ColorDefault can be used to select the global default.
 func (s Style) Background(c Color) Style {
 	return Style{
-		fg:    s.fg,
-		bg:    c,
-		attrs: s.attrs,
+		fg:        s.fg,
+		bg:        c,
+		attrs:     s.attrs,
+		hyperlink: s.hyperlink,
 	}
 }
 
@@ -64,23 +67,26 @@ func (s Style) Decompose() (fg Color, bg Color, attr AttrMask) {
 func (s Style) setAttrs(attrs AttrMask, on bool) Style {
 	if on {
 		return Style{
-			fg:    s.fg,
-			bg:    s.bg,
-			attrs: s.attrs | attrs,
+			fg:        s.fg,
+			bg:        s.bg,
+			attrs:     s.attrs | attrs,
+			hyperlink: s.hyperlink,
 		}
 	}
 	return Style{
-		fg:    s.fg,
-		bg:    s.bg,
-		attrs: s.attrs &^ attrs,
+		fg:        s.fg,
+		bg:        s.bg,
+		attrs:     s.attrs &^ attrs,
+		hyperlink: s.hyperlink,
 	}
 }
 
 // Normal returns the style with all attributes disabled.
 func (s Style) Normal() Style {
 	return Style{
-		fg: s.fg,
-		bg: s.bg,
+		fg:        s.fg,
+		bg:        s.bg,
+		hyperlink: s.hyperlink,
 	}
 }
 
@@ -130,8 +136,20 @@ func (s Style) StrikeThrough(on bool) Style {
 // specified.
 func (s Style) Attributes(attrs AttrMask) Style {
 	return Style{
-		fg:    s.fg,
-		bg:    s.bg,
-		attrs: attrs,
+		fg:        s.fg,
+		bg:        s.bg,
+		attrs:     attrs,
+		hyperlink: s.hyperlink,
+	}
+}
+
+// Hyperlink returns a new style based on s, with its hyperlink set to the
+// specified URL. An empty string disables the hyperlink.
+func (s Style) Hyperlink(url string) Style {
+	return Style{
+		fg:        s.fg,
+		bg:        s.bg,
+		attrs:     s.attrs,
+		hyperlink: url,
 	}
 }

terminfo/f/foot/foot.go

@@ -66,5 +66,8 @@ func init() {
 		KeyBacktab:    "\x1b[Z",
 		Modifiers:     1,
 		AutoMargin:    true,
+
+		Hyperlink:        "\x1b]8;;",
+		StringTerminator: "\x1b\\",
 	})
 }

terminfo/terminfo.go

@@ -227,6 +227,8 @@ type Terminfo struct {
 	CursorSteadyUnderline   string
 	CursorBlinkingBar       string
 	CursorSteadyBar         string
+	StringTerminator        string
+	Hyperlink               string
 }
 
 const (

tscreen.go

@@ -58,6 +58,17 @@ func LookupTerminfo(name string) (ti *terminfo.Terminfo, e error) {
 		terminfo.AddTerminfo(ti)
 	}
 
+	if vteVersion := os.Getenv("VTE_VERSION"); vteVersion != "" && ti.Hyperlink == "" && ti.StringTerminator == "" {
+		v, err := strconv.Atoi(vteVersion)
+		if err == nil && v > 5000 {
+			// hyperlinks are supported in VTE-based terminal on VTE >= 0.50.0.
+			// some terminals do not support it even when VTE does, but they will ignore the escape code in those cases.
+			// see https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda#terminal-emulators
+			ti.Hyperlink = "\x1b]8;;"
+			ti.StringTerminator = "\x1b\\"
+		}
+	}
+
 	return
 }
 
@@ -749,6 +760,11 @@ func (t *tScreen) drawCell(x, y int) int {
 		if attrs&AttrStrikeThrough != 0 {
 			t.TPuts(ti.StrikeThrough)
 		}
+		if style.hyperlink != "" && ti.Hyperlink != "" {
+			t.TPuts(ti.Hyperlink + style.hyperlink + ti.StringTerminator)
+		} else if t.curstyle.hyperlink != "" && ti.Hyperlink != "" {
+			t.TPuts(ti.Hyperlink + ti.StringTerminator)
+		}
 		t.curstyle = style
 	}
 	// now emit runes - taking care to not overrun width with a