Implement resume, skip, and stage selection

internal/app/plan.go

@@ -8,10 +8,11 @@ import (
 
 	"gitea.maximumdirect.net/eric/narratio/internal/artifacts"
 	"gitea.maximumdirect.net/eric/narratio/internal/config"
+	"gitea.maximumdirect.net/eric/narratio/internal/manifest"
 )
 
 // Plan validates configuration, prepares the local workdir, and prints stage order.
-func Plan(_ context.Context, args []string, out io.Writer) error {
+func Plan(ctx context.Context, args []string, out io.Writer) error {
 	fs := flag.NewFlagSet("plan", flag.ContinueOnError)
 	fs.SetOutput(io.Discard)
 
@@ -46,17 +47,32 @@ func Plan(_ context.Context, args []string, out io.Writer) error {
 		return fmt.Errorf("plan: prepare workdir: %w", err)
 	}
 
-	_ = force // TODO: use --force in future skip/stale planning behavior.
-
 	stages := BuildFullPlan()
+	var m *manifest.Manifest
+	m, err = loadManifestIfPresent(ctx, cfg)
+	if err != nil {
+		return fmt.Errorf("plan: %w", err)
+	}
+	decisions := decideStageActions(stages, m, force)
+
+	runCount := 0
+	skipCount := 0
 	if _, err := fmt.Fprintf(out, "narratio plan: workdir prepared at %s\n", paths.Root); err != nil {
 		return err
 	}
-	for _, s := range stages {
-		if _, err := fmt.Fprintln(out, s.Name()); err != nil {
+	for _, d := range decisions {
+		if d.Action == stageActionRun {
+			runCount++
+		} else {
+			skipCount++
+		}
+		if _, err := fmt.Fprintf(out, "%s: %s\n", d.Stage.Name(), d.Action); err != nil {
 			return err
 		}
 	}
+	if _, err := fmt.Fprintf(out, "totals: run=%d skip=%d\n", runCount, skipCount); err != nil {
+		return err
+	}
 
 	return nil
 }