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#!/bin/bash
set -e
current_tag="${GITHUB_REF#refs/tags/}"
start_ref="HEAD"
# Find the previous release on the same branch, skipping prereleases if the
# current tag is a full release
previous_tag=""
while [[ -z $previous_tag || ( $previous_tag == *-* && $current_tag != *-* ) ]]; do
previous_tag="$(git describe --tags "$start_ref"^ --abbrev=0)"
start_ref="$previous_tag"
done
git log "$previous_tag".. --reverse --merges --oneline --grep='Merge pull request #' | \
while read -r sha title; do
pr_num="$(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"
done
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