feat: 增加命令行工具的参数支持，包括路径、干运行模式和输出目录选项

cmd/buf.go

@@ -9,16 +9,21 @@ import (
 )
 
 func CommandBuf(root *cobra.Command) {
-	cmd := &cobra.Command{
-		Use:   "buf",
-		Short: "run buf commands",
-		RunE:  commandBufE,
-	}
+    cmd := &cobra.Command{
+        Use:   "buf",
+        Short: "run buf commands",
+        RunE:  commandBufE,
+    }
+
+    cmd.Flags().String("dir", ".", "Directory to run buf from")
+    cmd.Flags().Bool("dry-run", false, "Preview buf command without executing")
 
 	root.AddCommand(cmd)
 }
 
 func commandBufE(cmd *cobra.Command, args []string) error {
+    dir := cmd.Flag("dir").Value.String()
+    dryRun, _ := cmd.Flags().GetBool("dry-run")
 	if _, err := exec.LookPath("buf"); err != nil {
 		log.Warn("buf 命令不存在，正在安装 buf...")
 		log.Info("go install github.com/bufbuild/buf/cmd/buf@v1.48.0")
@@ -33,9 +38,19 @@ func commandBufE(cmd *cobra.Command, args []string) error {
 		}
 	}
 
-	log.Info("buf 命令已存在，正在运行 buf generate...")
-	log.Info("PROTOBUF GUIDE: https://buf.build/docs/best-practices/style-guide/")
-	generateCmd := exec.Command("buf", "generate")
+    // preflight: ensure buf.yaml exists
+    if _, err := os.Stat(filepath.Join(dir, "buf.yaml")); err != nil {
+        log.Warnf("未找到 %s，buf generate 可能失败", filepath.Join(dir, "buf.yaml"))
+    }
+
+    log.Info("buf 命令已存在，正在运行 buf generate...")
+    log.Info("PROTOBUF GUIDE: https://buf.build/docs/best-practices/style-guide/")
+    if dryRun {
+        log.Infof("[dry-run] (cd %s && buf generate)", dir)
+        return nil
+    }
+    generateCmd := exec.Command("buf", "generate")
+    generateCmd.Dir = dir
 	if err := generateCmd.Run(); err != nil {
 		return fmt.Errorf("运行 buf generate 失败: %v", err)
 	}