feat(modules): port gittools (lazygit) module to Go

internal/modules/gittools/gittools.go

@@ -0,0 +1,74 @@
+// Package gittools installs a declarative list of pacman packages.
+package gittools
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+	"github.com/MDietermann/ArduinoArchSetup/internal/platform"
+)
+
+type Module struct {
+	pkgs []string
+	pm   platform.PackageManager
+}
+
+func New(pkgs []string, pm platform.PackageManager) Module {
+	return Module{pkgs: pkgs, pm: pm}
+}
+
+type state struct{ Missing []string }
+
+func (Module) Meta() module.Meta {
+	return module.Meta{ID: "gittools", Name: "Git tools", Description: "Install lazygit."}
+}
+
+func (m Module) Detect(ctx context.Context) (module.State, error) {
+	var missing []string
+	for _, p := range m.pkgs {
+		ok, err := m.pm.IsInstalled(ctx, p)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
+			missing = append(missing, p)
+		}
+	}
+	return state{Missing: missing}, nil
+}
+
+func (m Module) Plan(ctx context.Context, cur module.State) (module.Plan, error) {
+	s, _ := cur.(state)
+	if len(s.Missing) == 0 {
+		return module.Plan{}, nil
+	}
+	missing := append([]string{}, s.Missing...)
+	return module.Plan{Actions: []module.Action{{
+		Description: "pacman install " + strings.Join(missing, ", "),
+		Kind:        module.ActionPackageInstall,
+		Exec:        func(ctx context.Context) error { return m.pm.Install(ctx, missing) },
+	}}}, nil
+}
+
+func (m Module) Apply(ctx context.Context, p module.Plan, r module.Reporter) error {
+	for i, a := range p.Actions {
+		r.Progress(m.Meta().ID, i+1, len(p.Actions), a.Description)
+		if err := a.Exec(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (m Module) Verify(ctx context.Context) error {
+	st, err := m.Detect(ctx)
+	if err != nil {
+		return err
+	}
+	if missing := st.(state).Missing; len(missing) > 0 {
+		return fmt.Errorf("packages not installed after apply: %v", missing)
+	}
+	return nil
+}

internal/modules/gittools/gittools_test.go

@@ -0,0 +1,113 @@
+package gittools
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+	"github.com/MDietermann/ArduinoArchSetup/internal/platform"
+)
+
+type fakeRunner struct {
+	runCalls  [][]string
+	outCalls  [][]string
+	installed map[string]bool // key: pkg name
+}
+
+func (f *fakeRunner) Run(_ context.Context, name string, args ...string) error {
+	f.runCalls = append(f.runCalls, append([]string{name}, args...))
+	return nil
+}
+
+func (f *fakeRunner) Output(_ context.Context, name string, args ...string) ([]byte, error) {
+	f.outCalls = append(f.outCalls, append([]string{name}, args...))
+	if name == "pacman" && len(args) == 2 && args[0] == "-Q" {
+		if f.installed[args[1]] {
+			return []byte(args[1] + " 1.0-1\n"), nil
+		}
+		return nil, errExitOne
+	}
+	return nil, nil
+}
+
+type exitOneErr struct{}
+
+func (exitOneErr) Error() string { return "exit status 1" }
+
+var errExitOne = exitOneErr{}
+
+type nopReporter struct{}
+
+func (nopReporter) Progress(string, int, int, string) {}
+func (nopReporter) Log(string, string)                {}
+
+func TestDetectAbsent(t *testing.T) {
+	r := &fakeRunner{installed: map[string]bool{}}
+	m := New([]string{"lazygit"}, platform.NewPacman(r))
+	st, err := m.Detect(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	s := st.(state)
+	if len(s.Missing) != 1 {
+		t.Fatalf("want 1 missing, got %v", s.Missing)
+	}
+}
+
+func TestDetectPresent(t *testing.T) {
+	r := &fakeRunner{installed: map[string]bool{"lazygit": true}}
+	m := New([]string{"lazygit"}, platform.NewPacman(r))
+	st, _ := m.Detect(context.Background())
+	if len(st.(state).Missing) != 0 {
+		t.Fatalf("want 0 missing, got %v", st.(state).Missing)
+	}
+}
+
+func TestPlanAbsentEmitsInstallAction(t *testing.T) {
+	m := New([]string{"lazygit"}, nil)
+	p, _ := m.Plan(context.Background(), state{Missing: []string{"lazygit"}})
+	if len(p.Actions) != 1 {
+		t.Fatalf("want 1 action, got %d", len(p.Actions))
+	}
+	if !strings.Contains(p.Actions[0].Description, "lazygit") {
+		t.Fatalf("desc: %s", p.Actions[0].Description)
+	}
+}
+
+func TestPlanPresentEmpty(t *testing.T) {
+	m := New([]string{"lazygit"}, nil)
+	p, _ := m.Plan(context.Background(), state{Missing: nil})
+	if !p.IsEmpty() {
+		t.Fatal("want empty plan")
+	}
+}
+
+func TestApplyShellsOut(t *testing.T) {
+	r := &fakeRunner{installed: map[string]bool{}}
+	m := New([]string{"lazygit"}, platform.NewPacman(r))
+	st, _ := m.Detect(context.Background())
+	p, _ := m.Plan(context.Background(), st)
+	if err := m.Apply(context.Background(), p, nopReporter{}); err != nil {
+		t.Fatal(err)
+	}
+	sawInstall := false
+	for _, c := range r.runCalls {
+		if len(c) >= 4 && c[0] == "sudo" && c[1] == "pacman" && c[2] == "-S" {
+			sawInstall = true
+		}
+	}
+	if !sawInstall {
+		t.Fatalf("no pacman install call; calls=%v", r.runCalls)
+	}
+}
+
+func TestVerifyAfterApply(t *testing.T) {
+	r := &fakeRunner{installed: map[string]bool{"lazygit": true}}
+	m := New([]string{"lazygit"}, platform.NewPacman(r))
+	if err := m.Verify(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+var _ module.Module = Module{}