feat: add CLI interface

README.md

@@ -13,16 +13,16 @@ This lib is so simple that it barely makes sense to create a standalone package
 
 ### CLI
 
-- Convert requests stored as JSON files to markdown files
+- Print request stored as JSON files to markdown representation to stdout
 
 ```
-chat_completion_md --json pattern/to/*.json
+chat_completion_md path/to/json/file.json
 ```
 
-- Convert markdown files to chat completion requests and save them as JSON
+- Print request stored as markdown files to JSON representation to stdout
 
 ```
-chat_completion_md --md pattern/to/*.md
+chat_completion_md path/to/md/file.md
 ```
 
 ### API

pyproject.toml

@@ -25,6 +25,9 @@ Issues = "https://github.com/S1M0N38/chat-completion-md/issues"
 Repository = "https://github.com/S1M0N38/chat-completion-md"
 Changelog = "https://github.com/S1M0N38/chat-completion-md/blob/main/CHANGELOG.md"
 
+[project.scripts]
+chat_completion_md = "chat_completion_md.cli:main"
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"

src/chat_completion_md/cli.py

@@ -0,0 +1,34 @@
+import sys
+from pathlib import Path
+
+from chat_completion_md import json_to_md, md_to_json
+
+
+def main() -> None:
+    """CLI entrypoint for chat-completion-md.
+
+    Convert between JSON and Markdown formats for chat completion requests:
+    - If input is a JSON file, outputs markdown to stdout
+    - If input is a Markdown file, outputs JSON to stdout
+    """
+    if len(sys.argv) != 2:
+        print("Usage: chat_completion_md <file>", file=sys.stderr)
+        sys.exit(1)
+
+    file_path = Path(sys.argv[1])
+    if not file_path.exists():
+        print(f"Error: File {file_path} not found", file=sys.stderr)
+        sys.exit(1)
+
+    try:
+        content = file_path.read_text()
+        if file_path.suffix == ".json":
+            print(json_to_md(content))
+        elif file_path.suffix == ".md":
+            print(md_to_json(content))
+        else:
+            print(f"Error: Unsupported file type {file_path.suffix}", file=sys.stderr)
+            sys.exit(1)
+    except Exception as e:
+        print(f"Error: {str(e)}", file=sys.stderr)
+        sys.exit(1)