feat(modules): port fonts module (AUR) to Go

internal/modules/fonts/fonts.go

@@ -0,0 +1,82 @@
+// Package fonts installs AUR fonts via the yay helper.
+package fonts
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+	"github.com/MDietermann/ArduinoArchSetup/internal/platform"
+)
+
+type Module struct {
+	fonts []string
+	pm    platform.PackageManager
+	aur   platform.AURHelper
+}
+
+func New(fonts []string, pm platform.PackageManager, aur platform.AURHelper) Module {
+	return Module{fonts: fonts, pm: pm, aur: aur}
+}
+
+type state struct{ Missing []string }
+
+func (Module) Meta() module.Meta {
+	return module.Meta{ID: "fonts", Name: "Nerd fonts", Description: "Install AUR nerd fonts."}
+}
+
+func (m Module) Detect(ctx context.Context) (module.State, error) {
+	var missing []string
+	for _, f := range m.fonts {
+		ok, err := m.pm.IsInstalled(ctx, f)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
+			missing = append(missing, f)
+		}
+	}
+	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: "ensure yay installed",
+			Kind:        module.ActionPackageInstall,
+			Exec:        func(ctx context.Context) error { return m.aur.EnsureInstalled(ctx) },
+		},
+		{
+			Description: "yay install " + strings.Join(missing, ", "),
+			Kind:        module.ActionPackageInstall,
+			Exec:        func(ctx context.Context) error { return m.aur.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 miss := st.(state).Missing; len(miss) > 0 {
+		return fmt.Errorf("fonts still missing: %v", miss)
+	}
+	return nil
+}