feat: add --json flag to analyze command for non-TTY environments (#533)

* feat: add --json flag to analyze command

* feat: implement JSON output mode for analyze

* refactor: rename jsonOutput flag to jsonMode to avoid conflict

cmd/analyze/json.go

@@ -0,0 +1,79 @@
+//go:build darwin
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"sync/atomic"
+)
+
+type jsonOutput struct {
+	Path       string      `json:"path"`
+	Entries    []jsonEntry `json:"entries"`
+	TotalSize  int64       `json:"total_size"`
+	TotalFiles int64       `json:"total_files"`
+}
+
+type jsonEntry struct {
+	Name  string `json:"name"`
+	Path  string `json:"path"`
+	Size  int64  `json:"size"`
+	IsDir bool   `json:"is_dir"`
+}
+
+func runJSONMode(path string, isOverview bool) {
+	result := performScanForJSON(path)
+
+	encoder := json.NewEncoder(os.Stdout)
+	encoder.SetIndent("", "  ")
+	if err := encoder.Encode(result); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to encode JSON: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func performScanForJSON(path string) jsonOutput {
+	var filesScanned, dirsScanned, bytesScanned int64
+	currentPath := &atomic.Value{}
+	currentPath.Store("")
+
+	items, err := os.ReadDir(path)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to read directory: %v\n", err)
+		os.Exit(1)
+	}
+
+	var entries []jsonEntry
+	var totalSize int64
+
+	for _, item := range items {
+		fullPath := path + "/" + item.Name()
+		var size int64
+
+		if item.IsDir() {
+			size = calculateDirSizeFast(fullPath, &filesScanned, &dirsScanned, &bytesScanned, currentPath)
+		} else {
+			info, err := item.Info()
+			if err == nil {
+				size = info.Size()
+			}
+		}
+
+		totalSize += size
+		entries = append(entries, jsonEntry{
+			Name:  item.Name(),
+			Path:  fullPath,
+			Size:  size,
+			IsDir: item.IsDir(),
+		})
+	}
+
+	return jsonOutput{
+		Path:       path,
+		Entries:    entries,
+		TotalSize:  totalSize,
+		TotalFiles: filesScanned,
+	}
+}

cmd/analyze/main.go

@@ -4,6 +4,7 @@ package main
 
 import (
 	"context"
+	"flag"
 	"fmt"
 	"os"
 	"os/exec"
@@ -16,6 +17,10 @@ import (
 	tea "github.com/charmbracelet/bubbletea"
 )
 
+var (
+	jsonMode = flag.Bool("json", false, "output analysis as JSON instead of TUI")
+)
+
 type dirEntry struct {
 	Name       string
 	Path       string
@@ -127,9 +132,11 @@ func (m model) inOverviewMode() bool {
 }
 
 func main() {
+	flag.Parse()
+
 	target := os.Getenv("MO_ANALYZE_PATH")
-	if target == "" && len(os.Args) > 1 {
-		target = os.Args[1]
+	if target == "" && len(flag.Args()) > 0 {
+		target = flag.Args()[0]
 	}
 
 	var abs string
@@ -148,12 +155,20 @@ func main() {
 		isOverview = false
 	}
 
+	if *jsonMode {
+		runJSONMode(abs, isOverview)
+	} else {
+		runTUIMode(abs, isOverview)
+	}
+}
+
+func runTUIMode(path string, isOverview bool) {
 	// Warm overview cache in background.
 	prefetchCtx, prefetchCancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer prefetchCancel()
 	go prefetchOverviewCache(prefetchCtx)
 
-	p := tea.NewProgram(newModel(abs, isOverview), tea.WithAltScreen())
+	p := tea.NewProgram(newModel(path, isOverview), tea.WithAltScreen())
 	if _, err := p.Run(); err != nil {
 		fmt.Fprintf(os.Stderr, "analyzer error: %v\n", err)
 		os.Exit(1)