feat(modules): port themes module to Go

internal/modules/themes/themes_test.go

@@ -0,0 +1,66 @@
+package themes
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/config"
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+)
+
+type nop struct{}
+
+func (nop) Progress(string, int, int, string) {}
+func (nop) Log(string, string)                 {}
+
+func TestThemesCopiesFiles(t *testing.T) {
+	src := t.TempDir()
+	if err := os.WriteFile(filepath.Join(src, "one.toml"), []byte("A"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	os.MkdirAll(filepath.Join(src, "sub"), 0o755)
+	os.WriteFile(filepath.Join(src, "sub", "two.toml"), []byte("B"), 0o644)
+
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	m := New(config.ThemesConfig{Source: src})
+	st, _ := m.Detect(context.Background())
+	p, _ := m.Plan(context.Background(), st)
+	if err := m.Apply(context.Background(), p, nop{}); err != nil {
+		t.Fatal(err)
+	}
+
+	got, _ := os.ReadFile(filepath.Join(home, ".config", "archduino", "themes", "one.toml"))
+	if string(got) != "A" {
+		t.Fatalf("one.toml: %q", got)
+	}
+	got, _ = os.ReadFile(filepath.Join(home, ".config", "archduino", "themes", "sub", "two.toml"))
+	if string(got) != "B" {
+		t.Fatalf("two.toml: %q", got)
+	}
+}
+
+func TestThemesIdempotent(t *testing.T) {
+	src := t.TempDir()
+	os.WriteFile(filepath.Join(src, "x.toml"), []byte("X"), 0o644)
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	m := New(config.ThemesConfig{Source: src})
+	_ = applyOnce(t, m)
+	st, _ := m.Detect(context.Background())
+	p, _ := m.Plan(context.Background(), st)
+	if !p.IsEmpty() {
+		t.Fatalf("second plan not empty: %+v", p.Actions)
+	}
+}
+
+func applyOnce(t *testing.T, m Module) error {
+	t.Helper()
+	st, _ := m.Detect(context.Background())
+	p, _ := m.Plan(context.Background(), st)
+	return m.Apply(context.Background(), p, nop{})
+}
+
+var _ module.Module = Module{}