diff --git a/tool/rawstr4c/lib/Parser.rakumod b/tool/rawstr4c/lib/Parser.rakumod
index 9b3d202..c7f7583 100644
--- a/tool/rawstr4c/lib/Parser.rakumod
+++ b/tool/rawstr4c/lib/Parser.rakumod
@@ -161,22 +161,9 @@ class Parser {
   #| 所有sections的扁平数组，已经是深度遍历的了
   has Section @!sections;
 
-  #| $path 可能是文件，也可能是目录
-  method new($path) {
-    my $markdown-file;
-
-    if $path.IO.d {
-      $markdown-file = $path.IO.add("rawstr4c.md");
-      unless $markdown-file.e {
-        die "Error: No 'rawstr4c.md' file found in directory '$path'\n";
-      }
-    }
-    elsif $path.IO.f {
-      $markdown-file = $path.IO;
-    } else {
-      die "Error: '$path' is neither a file nor a directory\n";
-    }
-    self.bless(:input-file($markdown-file.Str));
+  #| $markdown-file 必须是一个存在的 markdown 文件路径
+  method new($markdown-file) {
+    self.bless(:input-file($markdown-file));
   }
 
   # 获取根section（level 0）
diff --git a/tool/rawstr4c/rawstr4c.raku b/tool/rawstr4c/rawstr4c.raku
index d8c7713..1dcf9e7 100644
--- a/tool/rawstr4c/rawstr4c.raku
+++ b/tool/rawstr4c/rawstr4c.raku
@@ -7,43 +7,58 @@
 # File Authors  : Aoran Zeng <ccmywish@qq.com>
 # Contributors  :  Nul None  <nul@none.org>
 # Created On    : <2025-07-12>
-# Last Modified : <2025-07-14>
+# Last Modified : <2025-07-16>
 #
 # rawstr4c:
 #
 #             Raw strings for C programming language
 #
-# Usage:
-#       rawstr4c <FILE.md>  # 指定具体某文件名
-#       rawstr4c <DIR>      # 使用某一目录寻找 rawstr4c.md 文件
-#
-# 要注意的是，该程序一次性只能处理唯一一个文件
 # ---------------------------------------------------------------
 
+use lib 'lib';
 use Parser;
 use Generator;
 
 sub MAIN(
-  Str $input-path,
-  Bool :$debug = False  #= --debug
-) {
+  # 必须声明为可选，否则一直报奇怪的错
+  Str $input-path?,
+  Bool :$debug = False,  #= --debug
+  Bool :$help            #= --help
+)
+{
+  if $help || !$input-path {
+    print q:to/END/;
+      Usage: rawstr4c <FILE.md|DIR> [--debug]
+
+      Arguments:
+        FILE.md    Process a specific markdown file
+        DIR        Process rawstr4c.md file in the given directory
+
+      Options:
+        --debug    Show debug information during processing
+        --help     Show this help message
+      END
+    # exit($help ?? 0 !! 1);
+    exit(0);
+  }
+
   my $markdown-file;
 
   if $input-path.IO.d {
     $markdown-file = $input-path.IO.add("rawstr4c.md");
     unless $markdown-file.e {
-      die "Error: No 'rawstr4c.md' file found in directory '$input-path'\n";
+      die "Error: No 'rawstr4c.md' file found in directory '$input-path'";
     }
   }
   elsif $input-path.IO.f {
     $markdown-file = $input-path.IO;
   } else {
-    die "Error: '$input-path' is neither a file nor a directory\n";
+    die "Error: '$input-path' is neither a file nor a directory";
   }
 
-  my $parser = Parser::Parser.new($markdown-file);
+  my $parser = Parser::Parser.new($markdown-file.Str);
   $parser.parse;
-  $parser.debug if $debug;
+  $parser.debug-print-summary if $debug;
 
   Generator::Generator.new($parser).generate;
 }