An AI-driven git commit message generator. It needs a valid OpenAI key set as an env variable`OPENAI_API_KEY`. It works on macOS, needs curl and jq in order to work.

generate-commit.sh

#!/bin/bash

OPENAI_API_KEY="${OPENAI_API_KEY}"
HOST="https://api.openai.com"
MODEL="gpt-3.5-turbo"

# Check if the API key is set
if [ -z "$OPENAI_API_KEY" ]; then
    echo "OpenAI API key is not set. Please set the OPENAI_API_KEY environment variable."
    exit 1
fi

# Get the diff of staged changes
DIFF=$(git diff --staged)

# Check if there are any staged changes
if [ -z "$DIFF" ]; then
    echo "No changes are staged for commit."
    exit 1
fi

# Escape special JSON characters in the diff output
# This uses Perl instead of sed for better cross-platform compatibility
ESCAPED_DIFF=$(echo "content: $DIFF" | perl -pe 's/\\/\\\\/g; s/"/\\"/g; s/\n/\\n/g; s/\r//g;')

# Prepare the data for the API request
read -r -d '' DATA <<EOF
{
    "model": "$MODEL",
    "messages": [
        {"role": "system", "content": "You are a git message commit generator. You get a set of file changes and you generate a proper git commit message, following the Conventional Commits standard. Don't add any other info if not related to the changes themselves."},
        {"role": "user", "content": "$ESCAPED_DIFF"}
    ],
    "max_tokens": 250,
    "temperature": 0.3
}
EOF

# Make the API request to OpenAI using the chat completions endpoint
RESPONSE=$(curl -s "$HOST/v1/chat/completions" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -d "$DATA")

# Extract the commit message from the response
COMMIT_MESSAGE=$(echo $RESPONSE | jq -r '.choices[0].message.content')

# Output the commit message
echo "Here's a commit message based on the diff:"
echo "$COMMIT_MESSAGE"

Another Python version using openai lib

import subprocess
import os
from openai import OpenAI

api_key = os.getenv('OPENAI_API_KEY')
if not api_key:
    print("OpenAI API key is not set. Please set the OPENAI_API_KEY environment variable.")
    exit()
model = "gpt-3.5-turbo"
# model = "llama-3-70b-instruct"

client = OpenAI(api_key=api_key, base_url="https://api.openai.com/v1")
# client = OpenAI(api_key=api_key, base_url="https://api.perplexity.ai")

def get_git_diff():
    """Get the staged git diff."""
    return subprocess.run(['git', 'diff', '--staged'], stdout=subprocess.PIPE).stdout.decode('utf-8')

def escape_diff(diff):
    """Escape special JSON characters in the git diff."""
    return diff.replace('\\', '\\\\').replace('"', '\\"').replace('\n', '\\n').replace('\r', '\\r')

def generate_commit_message(diff):
    if not diff:
        print("No changes are staged for commit.")
        return

    escaped_diff = escape_diff(diff)

    try:
        response = client.chat.completions.create(model=model,
        messages=[
            {"role": "system", "content": "You are a git message commit generator. You get a set of file changes and you generate a proper git commit message, following the Conventional Commits standard. Don't add any other info if not related to the changes themselves."},
            {"role": "user", "content": escaped_diff}
        ],
        max_tokens=250,
        temperature=0.3)
        commit_message = response.choices[0].message.content
        print(commit_message)
    except Exception as e:
        print("Failed to generate commit message:", str(e))

if __name__ == '__main__':
    diff = get_git_diff()
    generate_commit_message(diff)