#!/bin/sh

COMMIT_MSG_FILE="${1}"
COMMIT_SOURCE="${2}"
SHA1="${3}"

# Only run on new commits.
if [ -z "${SHA1}" ] && [ -z "${COMMIT_SOURCE}" ]; then
    # Show last 4 commit messages.
    echo '' >> "${COMMIT_MSG_FILE}"
    echo '# Previous commits:' >> "${COMMIT_MSG_FILE}"
    git log --pretty=format:'#   %h %s' | head -n 4 >> "${COMMIT_MSG_FILE}"
fi