Improve argument help

.gitignore

@@ -29,6 +29,8 @@ plot/
 
 
 # Python
+/doc/*.html
+!/doc/template.html
 
 # Byte-compiled / optimized / DLL files
 __pycache__/

doc/README.md

@@ -13,3 +13,9 @@ source venv/bin/activate # anything other than Windows
 
 pip install -r requirements.txt
 ```
+
+## Usage
+
+```sh
+python src/main.py ../Common/src/main/resources hexcasting thehexbook template.html out.html
+```

doc/src/main.py

@@ -1,5 +1,6 @@
 from pathlib import Path
 from sys import stdout
+from typing import Optional
 
 from collate_data import parse_book, write_docs
 from tap import Tap
@@ -25,7 +26,7 @@ class Args(Tap):
         self.add_argument("mod_name")
         self.add_argument("book_name")
         self.add_argument("template_file")
-        self.add_argument("output_file", nargs="?")
+        self.add_argument("output_file", help="(Path, optional)", nargs="?")
 
 
 def main(args: Args) -> None: