standardize packaging, tooling, docs, CI, and licensing

openapi_first/cli.py

@@ -11,9 +11,8 @@ bundled templates packaged with the library.
 
 import argparse
 import shutil
-from pathlib import Path
 from importlib import resources
-
+from pathlib import Path
 
 DEFAULT_TEMPLATE = "health_app"
 
@@ -52,14 +51,15 @@ def copy_template(template: str, target_dir: Path) -> None:
     target_dir.mkdir(parents=True, exist_ok=True)
 
     root = resources.files("openapi_first.templates")
-    src = root / template
 
-    if not src.exists():
+    if template not in available_templates():
         raise FileNotFoundError(
             f"Template '{template}' not found. "
             f"Available templates: {', '.join(available_templates())}"
         )
 
+    src = root / template
+
     with resources.as_file(src) as path:
         shutil.copytree(path, target_dir, dirs_exist_ok=True)
 
@@ -168,11 +168,11 @@ def main() -> None:
         # Handle the case where someone uses the old CLI style (openapi-first template path)
         # argparse with subparsers might not automatically handle this if positional args are passed
         # but let's assume we want to encourage the new style.
-        
+
         # If no command was provided but positional args were, they might be for scaffolding
-        # This is a bit tricky with argparse subparsers. 
+        # This is a bit tricky with argparse subparsers.
         # For simplicity, let's just support the new explicit commands.
-        
+
         if args.command is None and not any(vars(args).values()):
             parser.print_help()
             return