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godeez/.github/scripts/release-notes.sh

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#!/usr/bin/env bash
#
# Extracts the CHANGELOG.md section for a version and formats it as the GitHub
# release body. Usage: release-notes.sh v1.5.0
#
# Exits non-zero when the version has no section, so a tag can never be
# published with empty or stale release notes.
set -euo pipefail
if [ $# -ne 1 ]; then
echo "usage: $0 <version>" >&2
exit 2
fi
version="${1#v}"
changelog="${CHANGELOG_FILE:-CHANGELOG.md}"
if [ ! -f "$changelog" ]; then
echo "$changelog not found" >&2
exit 1
fi
notes=$(awk -v ver="$version" '
BEGIN { heading = "## [" ver "]" }
index($0, heading) == 1 { found = 1; next }
found && index($0, "## [") == 1 { exit }
found { print }
' "$changelog")
if [ -z "${notes//[[:space:]]/}" ]; then
echo "no $changelog section found for version $version" >&2
exit 1
fi
printf "## What's new in v%s\n%s\n" "$version" "$notes"