Add --version option to CLI

- Imported pkg_resources to fetch the version of the installed package.
- Added @click.version_option decorator.
- The --version option prints the version of the devchat package.
- Added setuptools to the project dependencies.

devchat/_cli.py

@@ -6,6 +6,7 @@
 import os
 import sys
 from typing import List, Optional, Tuple
+import pkg_resources
 import rich_click as click
 from devchat.store import Store
 from devchat.openai import OpenAIChatConfig, OpenAIChat
@@ -18,6 +19,8 @@
 
 
 @click.group()
+@click.version_option(pkg_resources.get_distribution("devchat").version, '--version', '-v',
+                      message='DevChat %(version)s')
 def main():
     """DevChat CLI: A command-line interface for DevChat."""
 

pyproject.toml

@@ -26,6 +26,7 @@ rich_click = "^1.6.1"
 tiktoken = "^0.4.0"
 tinydb = "^4.7.1"
 urllib3 = "<2.0"
+setuptools = "^68.0.0"
 
 [tool.poetry.scripts]
 devchat = "devchat._cli:main"