git-context

#!/bin/bash

# git-context - Minimalist Git Context Generator for Commit Messages
# Generates essential git-related context to help LLMs create meaningful commit messages

# Get script directory (works even when called from other directories)
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"

# Default values
RECENT_COMMITS=3
PROMPT_FILE="$SCRIPT_DIR/prompts/commit_prompt.txt"
INCLUDE_PROMPT=true

# Parse arguments
while [[ "$#" -gt 0 ]]; do
    case $1 in
        --recent-commits=*) RECENT_COMMITS="${1#*=}"; shift ;;
        --prompt=*) PROMPT_FILE="${1#*=}"; shift ;;
        --no-prompt) INCLUDE_PROMPT=false; shift ;;
        --help|-h)
            echo "Usage: git-context [options]"
            echo ""
            echo "Options:"
            echo "  --recent-commits=<num>    Show most recent N commits for context (default: 3)"
            echo "  --prompt=<file>           Use custom commit message prompt from file (default: prompts/commit_prompt.txt)"
            echo "  --no-prompt               Don't include commit message prompt"
            echo "  --help, -h                Show this help message"
            exit 0
            ;;
        *) echo "Unknown parameter: $1"; exit 1 ;;
    esac
done

# Ensure we're in a git repository
if ! git rev-parse --is-inside-work-tree > /dev/null 2>&1; then
    echo "Error: Not a git repository" >&2
    exit 1
fi

# Begin output
echo "# Git Context for Commit Message Generation"
echo ""

# Show git status
status_output=$(git status --porcelain)
if [ -n "$status_output" ]; then
    echo "## Git Status"
    echo ""
    echo '```'
    git status -s
    echo '```'
    echo ""
fi

# Show changes using git diff HEAD
diff_output=$(git diff HEAD)
if [ -n "$diff_output" ]; then
    echo "## Current Changes (Diff)"
    echo ""
    echo '```diff'
    echo "$diff_output"
    echo '```'
    echo ""
fi

# Show summary of files changed
if [ -n "$status_output" ]; then
    echo "## Files Changed"
    echo ""
    
    echo "$status_output" | while read -r line; do
        # Extract the status code (first two characters)
        status_code="${line:0:2}"
        # Extract the filename (everything after the status code and whitespace)
        file=${line#??}
        file=${file#"${file%%[! ]*}"} # Remove leading whitespace
        status_desc=""
        
        # Determine the status description
        case "$status_code" in
            "M "|" M") status_desc="modified" ;;
            "A ") status_desc="added" ;;
            "D ") status_desc="deleted" ;;
            "R ") status_desc="renamed" ;;
            "C ") status_desc="copied" ;;
            "??") status_desc="untracked" ;;
            *) status_desc="$status_code" ;;
        esac
        
        echo "- $file ($status_desc)"
    done
    echo ""
fi

# Show recent commits
if [ "$RECENT_COMMITS" -gt 0 ]; then
    echo "## Recent Commits (for reference)"
    echo ""
    git log -n "$RECENT_COMMITS" --pretty=format:"- %h: %s (%an, %ar)" | while read -r line; do
        echo "$line"
    done
    echo ""
fi

# Include commit message prompt
if [ "$INCLUDE_PROMPT" = true ]; then
    echo "## Commit Message Guidance"
    echo ""
    
    # Check if prompt file exists
    if [ -f "$PROMPT_FILE" ]; then
        cat "$PROMPT_FILE"
    else
        echo "Error: Prompt file not found: $PROMPT_FILE" >&2
        exit 1
    fi
    echo ""
fi

exit 0