Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

internal/chart.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/egoist/mygo/ui"
 
-	"mujicaui/theme"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
 )
 
 // Linear maps domain D0..D1 onto pixels R0..R1.

internal/chart_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"mujicaui/theme"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
 )
 
 func TestNiceAndTicks(t *testing.T) {

internal/choice.go

@@ -3,8 +3,8 @@ package internal
 import (
 	"github.com/egoist/mygo/ui"
 
-	"mujicaui/icons"
-	"mujicaui/theme"
+	"github.com/ZacharyZhang-NY/MujicaUI/icons"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
 )
 
 // CheckState is what a drawn check box shows.

internal/git.go

@@ -5,7 +5,7 @@ import (
 
 	"github.com/egoist/mygo/ui"
 
-	"mujicaui/theme"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
 )
 
 // CodeSpans colors a code line; inBlock carries block comments.

internal/git_test.go

@@ -3,7 +3,7 @@ package internal
 import (
 	"testing"
 
-	"mujicaui/theme"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
 )
 
 func TestAnsiPaletteReadable(t *testing.T) {

internal/paint.go

@@ -6,7 +6,7 @@ import (
 
 	"github.com/egoist/mygo/ui"
 
-	"mujicaui/theme"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
 )
 
 // FocusRing strokes the keyboard ring outside r, leaving the focus gap.

internal/snaptest/snaptest.go

@@ -0,0 +1,116 @@
+// Package snaptest compares rendered views with the PNG goldens in testdata/snapshots.
+package snaptest
+
+import (
+	"bytes"
+	"flag"
+	"image"
+	"image/png"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+var update = flag.Bool("update", false, "rewrite snapshots")
+
+// Modes names the two themes a snapshot covers, in capture order.
+var Modes = []string{"light", "dark"}
+
+// child marks a process that renders snapshots itself.
+const child = "MUJICA_SNAPSHOT_CHILD"
+
+var ran sync.Map
+
+// dir is the module's testdata/snapshots/<os>, whatever package runs the test.
+var dir = func() string {
+	_, file, _, ok := runtime.Caller(0)
+	if !ok {
+		panic("snaptest: no caller")
+	}
+	return filepath.Join(filepath.Dir(file), "..", "..", "testdata", "snapshots", runtime.GOOS)
+}()
+
+// Run compares view, themed by theme for each of Modes, with testdata/snapshots/<os>/<name>-<mode>.png.
+// drive, when non-nil, sends input before the capture.
+func Run(t *testing.T, name string, w, h int, theme func(c *ui.Context, mode string), view func(c *ui.Context), drive func(tt *ui.Tester)) {
+	t.Helper()
+	if os.Getenv(child) == "" {
+		inChild(t)
+		return
+	}
+	for _, m := range Modes {
+		ready := false
+		tt := ui.NewTester(func(c *ui.Context) {
+			theme(c, m)
+			if ready {
+				view(c)
+			}
+		}, w, h)
+		// Animations must not paint before ReduceMotion applies.
+		tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: 1})
+		ready = true
+		tt.Frame()
+		if drive != nil {
+			drive(tt)
+		}
+		got := Encode(t, tt.Image())
+		path := filepath.Join(dir, name+"-"+m+".png")
+		if *update {
+			if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+				t.Fatal(err)
+			}
+			if err := os.WriteFile(path, got, 0o644); err != nil {
+				t.Fatal(err)
+			}
+			continue
+		}
+		want, err := os.ReadFile(path)
+		if err != nil {
+			t.Fatalf("%v (run go test -update)", err)
+		}
+		if !bytes.Equal(got, want) {
+			if err := os.WriteFile(path+".got.png", got, 0o644); err != nil {
+				t.Fatal(err)
+			}
+			t.Errorf("%s differs; see %s.got.png", path, path)
+		}
+	}
+}
+
+// inChild reruns the test alone in a fresh process; MyGo's path cache is process-wide.
+func inChild(t *testing.T) {
+	t.Helper()
+	if _, done := ran.LoadOrStore(t.Name(), true); done {
+		return
+	}
+	parts := strings.Split(t.Name(), "/")
+	for i, p := range parts {
+		parts[i] = "^" + regexp.QuoteMeta(p) + "$"
+	}
+	args := []string{"-test.run=" + strings.Join(parts, "/"), "-test.count=1"}
+	if *update {
+		args = append(args, "-update")
+	}
+	cmd := exec.Command(os.Args[0], args...)
+	cmd.Env = append(os.Environ(), child+"=1")
+	if out, err := cmd.CombinedOutput(); err != nil {
+		t.Fatalf("snapshot child failed: %v\n%s", err, out)
+	}
+}
+
+// Encode returns img as PNG bytes.
+func Encode(t *testing.T, img image.Image) []byte {
+	t.Helper()
+	var b bytes.Buffer
+	if err := png.Encode(&b, img); err != nil {
+		t.Fatal(err)
+	}
+	return b.Bytes()
+}