Add JSON output format for CLI commands

internal/app/inspect.go

@@ -10,11 +10,15 @@ import (
 )
 
 type InspectOptions struct {
-	Path   string
-	Stdout io.Writer
+	Path         string
+	Stdout       io.Writer
+	OutputFormat OutputFormat
 }
 
 func Inspect(ctx context.Context, options InspectOptions) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
+	}
 	if options.Path == "" {
 		return fmt.Errorf("inspect command requires a path")
 	}
@@ -26,9 +30,60 @@ func Inspect(ctx context.Context, options InspectOptions) error {
 	if err != nil {
 		return err
 	}
+	if IsJSONOutput(options.OutputFormat) {
+		return WriteJSONEnvelope(options.Stdout, "inspect", true, nil, inspectResultFromBundles(bundles), nil)
+	}
 	return writeInspection(options.Stdout, bundles)
 }
 
+type inspectResult struct {
+	BundleCount int                   `json:"bundle_count"`
+	Bundles     []inspectBundleResult `json:"bundles"`
+}
+
+type inspectBundleResult struct {
+	Path      string              `json:"path"`
+	ID        string              `json:"id"`
+	Created   string              `json:"created"`
+	Digest    string              `json:"digest"`
+	FileCount int                 `json:"file_count"`
+	TotalSize int64               `json:"total_size"`
+	Files     []inspectFileResult `json:"files"`
+}
+
+type inspectFileResult struct {
+	Path   string `json:"path"`
+	SHA256 string `json:"sha256"`
+	Size   int64  `json:"size"`
+}
+
+func inspectResultFromBundles(bundles []bundle.Bundle) inspectResult {
+	result := inspectResult{
+		BundleCount: len(bundles),
+		Bundles:     make([]inspectBundleResult, 0, len(bundles)),
+	}
+	for _, sourceBundle := range bundles {
+		bundleResult := inspectBundleResult{
+			Path:      storage.DisplayPath(sourceBundle.RootRelativePath),
+			ID:        sourceBundle.Manifest.ID,
+			Created:   sourceBundle.Manifest.Created.Format("2006-01-02T15:04:05Z07:00"),
+			Digest:    sourceBundle.Manifest.Digest,
+			FileCount: len(sourceBundle.Manifest.Files),
+			Files:     make([]inspectFileResult, 0, len(sourceBundle.Manifest.Files)),
+		}
+		for _, file := range sourceBundle.Manifest.Files {
+			bundleResult.TotalSize += file.Size
+			bundleResult.Files = append(bundleResult.Files, inspectFileResult{
+				Path:   file.Path,
+				SHA256: file.SHA256,
+				Size:   file.Size,
+			})
+		}
+		result.Bundles = append(result.Bundles, bundleResult)
+	}
+	return result
+}
+
 func writeInspection(w io.Writer, bundles []bundle.Bundle) error {
 	if w == nil {
 		return nil