set -e

current_tag="${GITHUB_REF#refs/tags/}"

start_ref="HEAD"

previous_tag=""

while [[ -z $previous_tag || ( $previous_tag == *-* && $current_tag != *-* ) ]]; do

previous_tag="$(git describe --tags "$start_ref"^ --abbrev=0)"

start_ref="$previous_tag"

git log "$previous_tag".. --reverse --first-parent --oneline | \

while read -r sha title; do

if [[ $title == "Merge pull request #"* ]]; then

pr_num="$(grep -o '#[[:digit:]]\+' <<<"$title")"

pr_desc="$(git show -s --format=%b "$sha" | sed -n '1,/^$/p' | tr $'\n' ' ')"

printf "* %s %s\n\n" "$pr_desc" "$pr_num"

else

printf "* %s\n\n" "$title"

fi

done