#!/usr/bin/env bash

set -e
OLD_DATE="$(git show HEAD -q | grep Date | cut -d: -f2-)"
NEW_DATE="$(date)"
OLD_HASH=$(git show HEAD -q | head -1 | awk '{print $2}')
pretty() {
    colorcode="${1}"
    shift
    string="${*}"
    echo -en "\033[1;${colorcode}m${string}\033[0m"
}
echo "old date was: '$(pretty 31 $OLD_DATE)'"
echo "recreating commit with new date: '$(pretty 32 $NEW_DATE)'"
NOTES=$(2>/dev/null git notes show HEAD)

GIT_COMMITTER_DATE="${NEW_DATE}" git commit --amend -C HEAD --date "${NEW_DATE}"
if [ -n "${NOTES}" ]; then
    git notes append -m "${NOTES}"
fi
NEW_HASH=$(git show HEAD -q | head -1 | awk '{print $2}')

echo "old hash was: $(pretty 31 $OLD_HASH)"
echo "new commit hash is: $(pretty 32 $NEW_HASH)"