Experimental Sixel support (#2544)

src/tui/dummy.go

@@ -38,6 +38,9 @@ func (r *FullscreenRenderer) Clear()                             {}
 func (r *FullscreenRenderer) NeedScrollbarRedraw() bool          { return false }
 func (r *FullscreenRenderer) Refresh()                           {}
 func (r *FullscreenRenderer) Close()                             {}
+func (r *FullscreenRenderer) Size() (termSize, error) {
+	return termSize{}, nil
+}
 
 func (r *FullscreenRenderer) GetChar() Event { return Event{} }
 func (r *FullscreenRenderer) MaxX() int      { return 0 }

src/tui/light.go

@@ -32,7 +32,7 @@ var offsetRegexp *regexp.Regexp = regexp.MustCompile("(.*)\x1b\\[([0-9]+);([0-9]
 var offsetRegexpBegin *regexp.Regexp = regexp.MustCompile("^\x1b\\[[0-9]+;[0-9]+R")
 
 func (r *LightRenderer) PassThrough(str string) {
-	r.queued.WriteString(str)
+	r.queued.WriteString("\x1b7" + str + "\x1b8")
 	r.flush()
 }
 
@@ -756,6 +756,10 @@ func (r *LightRenderer) NewWindow(top int, left int, width int, height int, prev
 	return w
 }
 
+func (w *LightWindow) DrawBorder() {
+	w.drawBorder(false)
+}
+
 func (w *LightWindow) DrawHBorder() {
 	w.drawBorder(true)
 }
@@ -1095,7 +1099,8 @@ func (w *LightWindow) FinishFill() {
 }
 
 func (w *LightWindow) Erase() {
-	w.drawBorder(false)
-	// We don't erase the window here to avoid flickering during scroll
+	w.DrawBorder()
+	w.Move(0, 0)
+	w.FinishFill()
 	w.Move(0, 0)
 }

src/tui/light_unix.go

@@ -8,6 +8,7 @@ import (
 	"os/exec"
 	"strings"
 	"syscall"
+	"unsafe"
 
 	"github.com/junegunn/fzf/src/util"
 	"golang.org/x/term"
@@ -108,3 +109,19 @@ func (r *LightRenderer) getch(nonblock bool) (int, bool) {
 	}
 	return int(b[0]), true
 }
+
+type window struct {
+	lines   uint16
+	columns uint16
+	width   uint16
+	height  uint16
+}
+
+func (r *LightRenderer) Size() (termSize, error) {
+	w := new(window)
+	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, r.ttyin.Fd(), syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(w)))
+	if err != 0 {
+		return termSize{}, err
+	}
+	return termSize{int(w.lines), int(w.columns), int(w.width), int(w.height)}, nil
+}

src/tui/tcell.go

@@ -203,6 +203,11 @@ func (r *FullscreenRenderer) Refresh() {
 	// noop
 }
 
+func (r *FullscreenRenderer) Size() (termSize, error) {
+	cols, lines := _screen.Size()
+	return termSize{lines, cols, 0, 0}, error("Not implemented")
+}
+
 func (r *FullscreenRenderer) GetChar() Event {
 	ev := _screen.PollEvent()
 	switch ev := ev.(type) {
@@ -541,6 +546,7 @@ func fill(x, y, w, h int, n ColorPair, r rune) {
 }
 
 func (w *TcellWindow) Erase() {
+	w.drawBorder(false)
 	fill(w.left-1, w.top, w.width+1, w.height-1, w.normal, ' ')
 }
 
@@ -692,6 +698,10 @@ func (w *TcellWindow) CFill(fg Color, bg Color, a Attr, str string) FillReturn {
 	return w.fillString(str, NewColorPair(fg, bg, a))
 }
 
+func (w *TcellWindow) DrawBorder() {
+	w.drawBorder(false)
+}
+
 func (w *TcellWindow) DrawHBorder() {
 	w.drawBorder(true)
 }

src/tui/tui.go

@@ -473,6 +473,13 @@ func MakeTransparentBorder() BorderStyle {
 		bottomRight: ' '}
 }
 
+type termSize struct {
+	Lines   int
+	Columns int
+	Width   int
+	Height  int
+}
+
 type Renderer interface {
 	Init()
 	Resize(maxHeightFunc func(int) int)
@@ -490,6 +497,8 @@ type Renderer interface {
 	MaxX() int
 	MaxY() int
 
+	Size() (termSize, error)
+
 	NewWindow(top int, left int, width int, height int, preview bool, borderStyle BorderStyle) Window
 }
 
@@ -499,6 +508,7 @@ type Window interface {
 	Width() int
 	Height() int
 
+	DrawBorder()
 	DrawHBorder()
 	Refresh()
 	FinishFill()