get-changelog

#!/usr/bin/env bash

set -euo pipefail

>&2 echo "::group::Get changelog"
trap ">&2 echo '::endgroup::'" EXIT # bash equivalent of defer func()

# Argument must be a committish or release tag.
PREVIOUS_VERSION="${1:-""}"
if [ -z "${PREVIOUS_VERSION}" ]; then
  >&2 echo "::warn::Previous version argument missing, use a release tag or commitish."
  PREVIOUS_VERSION=$(git rev-list --max-parents=0 HEAD)
fi
# All other arguments are passed to git-cliff as is.
shift 1

# For debugging, use a commit other than HEAD as the 'current commit' to calculate the changelog.
CURRENT_COMMIT="${CURRENT_COMMIT:-"HEAD"}"

if git merge-base --is-ancestor "${PREVIOUS_VERSION}" "${CURRENT_COMMIT}"; then
  >&2 echo "::debug::Previous version is an ancestor."
  MERGE_BASE="${PREVIOUS_VERSION}"
else
  >&2 echo "::debug::Previous version is not an ancestor, finding best common ancestor."
  MERGE_BASE="$(git merge-base "${PREVIOUS_VERSION}" "${CURRENT_COMMIT}")"
fi

>&2 echo "::debug::Merge base ${MERGE_BASE}"

go run github.com/aaronfriel/go-change@v0.1.2 render --filter-since-commit "${MERGE_BASE}" "${@}"