A quick and dirty changelog generator for Bash

changelog.sh

#!/usr/bin/env bash
set -euo pipefail

SINCE="${1:-HEAD~1}"

query_log() {
	local type="$1"
	local pattern="^${type}\(.*\):\s"
	local GH_HOST="github.com"
	local owner="nikoheikkila"
	local repository="nikoheikkila.fi"
	local commit_url="https://${GH_HOST}/${owner}/${repository}/commit/%H"

	git log --grep "${pattern}" --pretty="- %s [(\`%h\`)](${commit_url})" "${SINCE}...HEAD"
	echo ""
}

{
  echo "### New Features"
  query_log "feat"

  echo "### Bug Fixes"
  query_log "fix"

  echo "### Documentation"
  query_log "docs"
} > CHANGELOG.md

pandoc -s -f markdown -t markdown+smart -o CHANGELOG.md --metadata title="Release Notes" CHANGELOG.md
pandoc -s -f markdown+smart -t html -o CHANGELOG.html --metadata title="Release Notes" CHANGELOG.md