Show posters as real images in kitty and Ghostty (Kitty graphics with Unicode placeholders)
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude Sonnet 5.5
@@ -0,0 +1,241 @@
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package ui
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import (
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"bytes"
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"encoding/base64"
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"image"
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"image/png"
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"math/rand"
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"regexp"
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"strings"
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"testing"
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"github.com/gdamore/tcell/v2"
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)
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// recorder collects what is written to the terminal.
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type recorder struct{ cmds []string }
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func (r *recorder) write(b []byte) error { r.cmds = append(r.cmds, string(b)); return nil }
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func noisy(w, h int) *image.RGBA {
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img := image.NewRGBA(image.Rect(0, 0, w, h))
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rng := rand.New(rand.NewSource(1))
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for i := range img.Pix {
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img.Pix[i] = uint8(rng.Intn(256))
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}
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for i := 3; i < len(img.Pix); i += 4 {
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img.Pix[i] = 255
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}
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return img
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}
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func TestKittyDiacriticsTable(t *testing.T) {
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if len(kittyDiacritics) != 297 {
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t.Fatalf("%d diacritics, the protocol defines 297", len(kittyDiacritics))
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}
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if kittyDiacritics[0] != 0x0305 || kittyDiacritics[296] != 0x1D244 {
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t.Errorf("table ends are %U and %U", kittyDiacritics[0], kittyDiacritics[296])
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}
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for i := 1; i < len(kittyDiacritics); i++ {
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if kittyDiacritics[i] <= kittyDiacritics[i-1] {
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t.Fatalf("table not strictly ascending at %d", i)
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}
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}
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}
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func TestKittyUploadChunksAndEncodes(t *testing.T) {
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rec := &recorder{}
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k := newKittyGraphics(rec.write)
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img := noisy(200, 300) // incompressible: far more than one 4096-byte chunk of base64
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id, err := k.imageID(img)
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if err != nil || id != 1 {
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t.Fatalf("id=%d err=%v", id, err)
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}
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if len(rec.cmds) < 3 {
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t.Fatalf("only %d commands for a large image", len(rec.cmds))
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}
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re := regexp.MustCompile(`^\x1b_G([^;]*);(.*)\x1b\\$`)
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var payload strings.Builder
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for i, c := range rec.cmds {
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m := re.FindStringSubmatch(c)
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if m == nil {
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t.Fatalf("command %d is not a graphics command: %q", i, c[:min(40, len(c))])
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}
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keys, data := m[1], m[2]
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if len(data) > kittyChunk {
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t.Errorf("chunk %d has %d bytes", i, len(data))
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}
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last := i == len(rec.cmds)-1
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switch {
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case i == 0 && !strings.HasPrefix(keys, "a=t,f=100,t=d,i=1,q=2,m=1"):
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t.Errorf("first command keys = %q", keys)
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case i > 0 && !last && keys != "m=1":
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t.Errorf("middle command keys = %q", keys)
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case last && !strings.HasSuffix(keys, "m=0"):
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t.Errorf("last command keys = %q", keys)
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}
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payload.WriteString(data)
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}
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raw, err := base64.StdEncoding.DecodeString(payload.String())
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if err != nil {
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t.Fatal(err)
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}
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decoded, err := png.Decode(bytes.NewReader(raw))
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if err != nil || decoded.Bounds() != img.Bounds() {
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t.Fatalf("payload is not the image as PNG: %v %v", decoded, err)
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}
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r, g, b, _ := decoded.At(17, 23).RGBA()
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want := img.RGBAAt(17, 23)
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if uint8(r>>8) != want.R || uint8(g>>8) != want.G || uint8(b>>8) != want.B {
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t.Error("pixel data changed")
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}
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// The same image is not uploaded twice; another one gets the next id.
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n := len(rec.cmds)
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if again, _ := k.imageID(img); again != id || len(rec.cmds) != n {
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t.Error("an uploaded image must be reused")
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}
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if other, _ := k.imageID(noisy(4, 4)); other != 2 {
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t.Errorf("second image id = %d", other)
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}
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}
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func TestKittyPlacement(t *testing.T) {
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rec := &recorder{}
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k := newKittyGraphics(rec.write)
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if err := k.place(7, 20, 15); err != nil {
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t.Fatal(err)
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}
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if len(rec.cmds) != 1 || rec.cmds[0] != "\x1b_Ga=p,U=1,i=7,c=20,r=15,q=2\x1b\\" {
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t.Fatalf("first placement: %q", rec.cmds)
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}
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k.place(7, 20, 15) // unchanged: nothing to send
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if len(rec.cmds) != 1 {
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t.Errorf("unchanged placement sent %d commands", len(rec.cmds))
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}
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k.place(7, 10, 8) // a new size replaces the placement
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if len(rec.cmds) != 3 || rec.cmds[1] != "\x1b_Ga=d,d=i,i=7,q=2\x1b\\" || rec.cmds[2] != "\x1b_Ga=p,U=1,i=7,c=10,r=8,q=2\x1b\\" {
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t.Errorf("resize: %q", rec.cmds[1:])
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}
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rec.cmds = nil
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id, _ := k.imageID(noisy(2, 2))
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k.deleteAll()
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if last := rec.cmds[len(rec.cmds)-1]; last != "\x1b_Ga=d,d=I,i="+itoa(int(id))+",q=2\x1b\\" {
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t.Errorf("deleteAll sent %q", last)
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}
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if len(k.ids) != 0 || len(k.placed) != 0 {
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t.Error("deleteAll must forget everything")
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}
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}
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func TestPlaceholderCell(t *testing.T) {
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ch, comb, style := placeholderCell(0x010203, 2, 5)
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if ch != '\U0010EEEE' || len(comb) != 2 || comb[0] != kittyDiacritics[2] || comb[1] != kittyDiacritics[5] {
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t.Errorf("cell = %U %U", ch, comb)
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}
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fg, _, _ := style.Decompose()
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if r, g, b := fg.RGB(); r != 1 || g != 2 || b != 3 {
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t.Errorf("the id must be in the foreground color, got %d,%d,%d", r, g, b)
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}
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}
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func TestKittyTerminalDetection(t *testing.T) {
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env := func(m map[string]string) func(string) string { return func(k string) string { return m[k] } }
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for _, tc := range []struct {
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name string
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env map[string]string
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want bool
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}{
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{"ghostty term", map[string]string{"TERM": "xterm-ghostty"}, true},
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{"ghostty program", map[string]string{"TERM": "xterm-256color", "TERM_PROGRAM": "ghostty"}, true},
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{"ghostty resources", map[string]string{"GHOSTTY_RESOURCES_DIR": "/x"}, true},
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{"kitty", map[string]string{"TERM": "xterm-kitty"}, true},
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{"kitty window", map[string]string{"KITTY_WINDOW_ID": "1"}, true},
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{"plain xterm", map[string]string{"TERM": "xterm-256color"}, false},
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{"wezterm has no placeholders", map[string]string{"TERM_PROGRAM": "WezTerm"}, false},
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{"tmux swallows graphics", map[string]string{"TERM": "xterm-ghostty", "TMUX": "/tmp/x"}, false},
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{"screen swallows graphics", map[string]string{"TERM": "screen-256color", "TERM_PROGRAM": "ghostty"}, false},
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{"nothing", nil, false},
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} {
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if got := kittyTerminal(env(tc.env)); got != tc.want {
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t.Errorf("%s: %v, want %v", tc.name, got, tc.want)
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}
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}
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for _, tc := range []struct {
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setting string
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env map[string]string
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wantGfx bool
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wantName string
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}{
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{"auto", map[string]string{"TERM": "xterm-ghostty"}, true, "sextant"},
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{"", map[string]string{"TERM": "xterm-256color"}, false, "quadrant"},
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{"kitty", map[string]string{"TERM": "xterm-256color"}, true, "quadrant"},
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{"sextant", map[string]string{"TERM": "xterm-ghostty"}, false, "sextant"},
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{"quadrant", map[string]string{"TERM": "xterm-ghostty"}, false, "quadrant"},
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} {
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blocks, gfx := resolveCovers(tc.setting, env(tc.env))
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if gfx != tc.wantGfx || blocks.name != tc.wantName {
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t.Errorf("%q %v = %s/%v, want %s/%v", tc.setting, tc.env, blocks.name, gfx, tc.wantName, tc.wantGfx)
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}
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}
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}
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// trueColor makes a simulation screen report 24-bit color.
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type trueColor struct{ tcell.SimulationScreen }
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func (trueColor) Colors() int { return 1 << 24 }
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func TestCoverViewGraphicsDrawsPlaceholders(t *testing.T) {
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sim := tcell.NewSimulationScreen("")
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if err := sim.Init(); err != nil {
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t.Fatal(err)
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}
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defer sim.Fini()
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sim.SetSize(40, 20)
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rec := &recorder{}
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c := newCoverView(quadrantStyle, newKittyGraphics(rec.write), nil)
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c.setImage(stripes(40, 60)) // 2:3, cells twice as tall as wide: 13 columns × 10 rows in a 30×10 box
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c.SetRect(0, 0, 30, 10)
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// Without true color the protocol is not used and blocks are drawn.
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c.Draw(sim)
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if len(rec.cmds) != 0 {
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t.Fatalf("graphics commands sent without true color: %q", rec.cmds)
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}
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if ch, _, _, _ := sim.GetContent(29, 0); ch == placeholderRune {
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t.Error("placeholders drawn without true color")
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}
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screen := trueColor{sim}
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c.Draw(screen)
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if len(rec.cmds) != 2 { // upload (one chunk) + placement
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t.Fatalf("%d commands: %q", len(rec.cmds), rec.cmds)
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}
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if !strings.Contains(rec.cmds[1], "c=13,r=10") {
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t.Errorf("placement = %q", rec.cmds[1])
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}
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// Right-aligned: columns 17..29, rows 0..9.
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ch, comb, _, _ := sim.GetContent(17, 0)
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if ch != placeholderRune || len(comb) < 2 || comb[0] != kittyDiacritics[0] || comb[1] != kittyDiacritics[0] {
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t.Errorf("top left cell = %U %U", ch, comb)
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}
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ch, comb, _, _ = sim.GetContent(29, 9)
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if ch != placeholderRune || comb[0] != kittyDiacritics[9] || comb[1] != kittyDiacritics[12] {
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t.Errorf("bottom right cell = %U %U", ch, comb)
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}
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c.Draw(screen) // a second frame uploads nothing again
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if len(rec.cmds) != 2 {
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t.Errorf("redraw sent %d more commands", len(rec.cmds)-2)
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}
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// A cell aspect of 2.5 (taller cells) changes the footprint of the same box.
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c.cellAspect = func() float64 { return 2.5 }
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c.Draw(screen)
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if len(rec.cmds) != 4 || !strings.Contains(rec.cmds[3], "c=16,r=10") {
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t.Errorf("after the cell aspect changed: %q", rec.cmds[2:])
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}
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}
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