feat(cli): add apply subcommand

internal/cli/apply.go

@@ -0,0 +1,91 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/apply"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+	"github.com/lukaszraczylo/harness-sync/internal/gitx"
+)
+
+// NewApply returns the `apply` subcommand. It renders the canonical bundle
+// to each detected (or selected) harness using the apply pipeline.
+func NewApply(reg *adapter.Registry) *cobra.Command {
+	var (
+		dryRun bool
+		force  bool
+		root   string
+	)
+	cmd := &cobra.Command{
+		Use:   "apply [harness...]",
+		Short: "Render canonical and propagate to harnesses",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if root == "" {
+				h, err := os.UserHomeDir()
+				if err != nil {
+					return err
+				}
+				root = filepath.Join(h, ".config", "harness-sync")
+			}
+			b, err := canonical.Load(root)
+			if err != nil {
+				return err
+			}
+
+			var selected []adapter.Adapter
+			if len(args) == 0 {
+				for _, a := range reg.All() {
+					if a.Detect() {
+						selected = append(selected, a)
+					}
+				}
+			} else {
+				for _, name := range args {
+					a, ok := reg.Get(name)
+					if !ok {
+						return fmt.Errorf("unknown adapter %q", name)
+					}
+					selected = append(selected, a)
+				}
+			}
+
+			opt := apply.Options{
+				Bundle:   b,
+				Adapters: selected,
+				Repo:     gitx.New(root),
+				DryRun:   dryRun,
+				Force:    force,
+			}
+			rep, err := apply.Run(opt)
+			if err != nil {
+				return err
+			}
+			mode := "applied"
+			if dryRun {
+				mode = "dry-run"
+			}
+			if _, err := fmt.Fprintf(cmd.OutOrStdout(), "%s: %d written, %d skipped, %d conflicts\n",
+				mode, rep.Written, rep.Skipped, rep.Conflicts); err != nil {
+				return err
+			}
+			for _, a := range rep.Actions {
+				if _, err := fmt.Fprintf(cmd.OutOrStdout(), "  %-10s %-12s %s %s\n", a.Adapter, a.Kind, a.Dest, a.Note); err != nil {
+					return err
+				}
+			}
+			if rep.Conflicts > 0 {
+				return fmt.Errorf("%d conflicts; resolve .rej files", rep.Conflicts)
+			}
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&dryRun, "dry-run", false, "print actions without writing")
+	cmd.Flags().BoolVar(&force, "force", false, "overwrite without 3-way merge")
+	cmd.Flags().StringVar(&root, "root", "", "canonical root (default ~/.config/harness-sync)")
+	return cmd
+}