generate_pr_desc.sh

#!/bin/bash

dest_branch="origin/${1:-"main"}"

# Diff the current branch against origin/main
diff_output=$(git diff $dest_branch)
json_safe_diff=$(jq -Rs . <<< "$diff_output")
OPENAI_API_KEY=$(cat ~/.openai_api_key)

# Use jq to create the JSON payload
json_payload=$(jq -n \
    "{
        \"messages\": [
        {
            \"role\": \"system\",
            \"content\": \"You are a helpful assistant designed to generate clear consiste pull request descriptions for humans to quickly understand what has changed in a pull request.\"
        },
        {
            \"role\": \"user\",
            \"content\": $json_safe_diff
        }
        ],
        \"model\": \"gpt-3.5-turbo-1106\",
    }")

# Send the diff to OpenAI API and ask for a PR description
# Make sure you have jq and curl installed and your OPENAI_API_KEY is set as an environment variable
response=$(curl -s -X POST "https://api.openai.com/v1/chat/completions" \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -H "Content-Type: application/json" \
    -d "$json_payload")

# Check if there's an "error" key in the response
error_message=$(echo $response | jq -r '.error.message // empty')


if [[ -n $error_message ]]; then
    echo "🤖 Error: $error_message"
    exit 1
else
    # Extract the text from the response
    pr_description=$(echo $response | jq -r '.choices[0].message.content')

    # Check if pr_description is empty
    if [[ -n $pr_description ]]; then
        # Copy the PR description to the clipboard
        echo "$pr_description" | pbcopy

        # Output the PR description
        echo "🤖 PR Description based on the diff with ${dest_branch}:

$pr_description

(The description is copied to your clipboard.)"
    else
        echo "Error: Unable to generate PR description."
        exit 1
    fi
fi