feat: add init manifest flag

Author: MarioCadenas

cmd/apps/apps.go

@@ -11,6 +11,7 @@ const ManagementGroupID = "management"
 func Commands() []*cobra.Command {
 	return []*cobra.Command{
 		newInitCmd(),
+		newManifestCmd(),
 		newDevRemoteCmd(),
 		newLogsCommand(),
 		newRunLocal(),

cmd/apps/init.go

@@ -3,6 +3,7 @@ package apps
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"os"
@@ -501,6 +502,64 @@ func resolveTemplate(ctx context.Context, templatePath, branch, subdir string) (
 	return tempDir, cleanup, nil
 }
 
+// runManifestOnly resolves the template, loads appkit.plugins.json if present, and prints it to stdout (or a message if not found).
+func runManifestOnly(ctx context.Context, templatePath, branch, version string) error {
+	templateSrc := templatePath
+	if templateSrc == "" {
+		templateSrc = os.Getenv(templatePathEnvVar)
+	}
+	gitRef := branch
+	usingDefaultTemplate := templateSrc == ""
+	if usingDefaultTemplate {
+		switch {
+		case branch != "":
+		case version != "":
+			gitRef = normalizeVersion(version)
+		default:
+			gitRef = appkitDefaultBranch
+		}
+		templateSrc = appkitRepoURL
+	}
+
+	branchForClone := branch
+	subdirForClone := ""
+	if usingDefaultTemplate {
+		branchForClone = gitRef
+		subdirForClone = appkitTemplateDir
+	}
+	resolvedPath, cleanup, err := resolveTemplate(ctx, templateSrc, branchForClone, subdirForClone)
+	if err != nil {
+		return err
+	}
+	if cleanup != nil {
+		defer cleanup()
+	}
+
+	templateDir := filepath.Join(resolvedPath, "generic")
+	if _, err := os.Stat(templateDir); os.IsNotExist(err) {
+		templateDir = resolvedPath
+		if _, err := os.Stat(templateDir); os.IsNotExist(err) {
+			return fmt.Errorf("template not found at %s (also checked %s/generic)", resolvedPath, resolvedPath)
+		}
+	}
+
+	if manifest.HasManifest(templateDir) {
+		m, err := manifest.Load(templateDir)
+		if err != nil {
+			return fmt.Errorf("load manifest: %w", err)
+		}
+		enc, err := json.MarshalIndent(m, "", "  ")
+		if err != nil {
+			return fmt.Errorf("encode manifest: %w", err)
+		}
+		fmt.Fprintln(os.Stdout, string(enc))
+		return nil
+	}
+
+	fmt.Fprintln(os.Stdout, "No appkit.plugins.json manifest found in this template.")
+	return nil
+}
+
 func runCreate(ctx context.Context, opts createOptions) error {
 	var selectedPlugins []string
 	var resourceValues map[string]string

cmd/apps/init_test.go

@@ -1,8 +1,12 @@
 package apps
 
 import (
+	"bytes"
 	"context"
 	"errors"
+	"io"
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/databricks/cli/libs/apps/manifest"
@@ -453,3 +457,45 @@ func TestAppendUniqueNoValues(t *testing.T) {
 	result := appendUnique([]string{"a", "b"})
 	assert.Equal(t, []string{"a", "b"}, result)
 }
+
+func TestRunManifestOnlyFound(t *testing.T) {
+	dir := t.TempDir()
+	manifestPath := filepath.Join(dir, manifest.ManifestFileName)
+	content := `{"$schema":"https://example.com/schema","version":"1.0","plugins":{"analytics":{"name":"analytics","resources":{"required":[],"optional":[]}}}}`
+	require.NoError(t, os.WriteFile(manifestPath, []byte(content), 0o644))
+
+	old := os.Stdout
+	r, w, err := os.Pipe()
+	require.NoError(t, err)
+	os.Stdout = w
+
+	err = runManifestOnly(context.Background(), dir, "", "")
+	w.Close()
+	os.Stdout = old
+	require.NoError(t, err)
+
+	var buf bytes.Buffer
+	_, _ = io.Copy(&buf, r)
+	out := buf.String()
+	assert.Contains(t, out, `"version": "1.0"`)
+	assert.Contains(t, out, `"analytics"`)
+}
+
+func TestRunManifestOnlyNotFound(t *testing.T) {
+	dir := t.TempDir()
+
+	old := os.Stdout
+	r, w, err := os.Pipe()
+	require.NoError(t, err)
+	os.Stdout = w
+
+	err = runManifestOnly(context.Background(), dir, "", "")
+	w.Close()
+	os.Stdout = old
+	require.NoError(t, err)
+
+	var buf bytes.Buffer
+	_, _ = io.Copy(&buf, r)
+	out := buf.String()
+	assert.Equal(t, "No appkit.plugins.json manifest found in this template.\n", out)
+}

cmd/apps/manifest.go

@@ -0,0 +1,48 @@
+package apps
+
+import (
+	"errors"
+
+	"github.com/spf13/cobra"
+)
+
+func newManifestCmd() *cobra.Command {
+	var (
+		templatePath string
+		branch       string
+		version      string
+	)
+
+	cmd := &cobra.Command{
+		Use:   "manifest",
+		Short: "Print the template's appkit.plugins.json manifest to stdout",
+		Long: `Resolves a template (default AppKit repo or --template URL), locates appkit.plugins.json,
+and prints its contents to stdout. No workspace authentication is required.
+
+Use the same --template, --branch, and --version flags as "databricks apps init" to target
+a specific template. Without --template, uses the default AppKit template (main branch).
+
+Examples:
+  # Default template manifest
+  databricks apps manifest
+
+  # Specific version of default template
+  databricks apps manifest --version v0.2.0
+
+  # Manifest from a GitHub repo
+  databricks apps manifest --template https://github.com/user/repo --branch main`,
+		Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+			if cmd.Flags().Changed("branch") && cmd.Flags().Changed("version") {
+				return errors.New("--branch and --version are mutually exclusive")
+			}
+			return runManifestOnly(ctx, templatePath, branch, version)
+		},
+	}
+
+	cmd.Flags().StringVar(&templatePath, "template", "", "Template path (local directory or GitHub URL)")
+	cmd.Flags().StringVar(&branch, "branch", "", "Git branch or tag (for GitHub templates, mutually exclusive with --version)")
+	cmd.Flags().StringVar(&version, "version", "", "AppKit version for default template (default: main, use 'latest' for main branch)")
+	return cmd
+}