git-changelog

#!/bin/bash -e

COMMIT=${1:-HEAD}

VERSIONS=$(git tag --list --sort -v:refname --no-contains ${COMMIT})
SINCE=$(head -1 <<<${VERSIONS})
SINCE=${SINCE:-$(git rev-list --max-parents=0 HEAD)}

cat <<-SUBJECT
	Changes since ${SINCE} up to ${COMMIT}

SUBJECT

HEADLINES=$(git log --no-merges --pretty=format:"%s" -E --grep "#[0-9]+" --grep "#headline" ${SINCE}..${COMMIT} | sort -u | awk '{ print "  * " $0 }')

if [ -n "${HEADLINES}" ]; then
	cat <<-HEADLINES
		Headlines:

		${HEADLINES}

	HEADLINES
fi

git shortlog -n --no-merges ${SINCE}..${COMMIT} | cat