[Bitrise] Export Changelog

#!/bin/bash
# fail if any commands fails
set +e
# debug log
# set -x

lastTag="$(git describe --tags --abbrev=0)"

set -e

if [ -z "${lastTag}" ]; then
	changelog="$(git log --pretty="• %s %gn" --abbrev-commit --no-merges --reverse)"
else
	changelog="$(git log "${lastTag}"..HEAD --pretty="• %s %gn" --abbrev-commit --no-merges --reverse)"
fi

if [ -z "${changelog}" ]; then
	echo " [!] Unable to retrieve Git Changelog"
  	exit 1
else
	envman add --key GIT_CHANGELOG --value "${changelog}"
	echo "Changelog:  ${changelog}"
fi

exit 0