[pre-commit.ci] pre-commit autoupdate #29

	name: check-changelog

	on:
	pull_request:

	jobs:
	validate-fragment:
	if: ${{ !contains(github.event.pull_request.labels.*.name, 'no-changelog-entry-required') }}
	runs-on: ubuntu-latest
	env:
	PR_NUMBER: ${{ github.event.pull_request.number }}
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- uses: actions/setup-python@v5
	with:
	python-version: '3.13'
	- run: pip install towncrier
	- name: Make sure exactly one valid Towncrier fragment exists
	shell: bash
	run: \|
	set -euo pipefail

	dir=changes

	mapfile -t fragments < <(find ${dir} -type f -name "${PR_NUMBER}.*.md" -printf '%P\n')

	count=${#fragments[@]}

	if [ "$count" -eq 1 ]; then
	echo "Found changelog fragment: ${fragments[0]}"
	elif [ "$count" -eq 0 ]; then
	echo "::error::No fragment named '${PR_NUMBER}.*.md' found in '${dir}/'."
	echo "Check the [changes README](https://github.com/lang-m/blaupause/blob/main/changes/README.md) for instructions."
	exit 1
	else
	echo "::error::Multiple fragments for PR #${PR_NUMBER} found; expected exactly one."
	printf 'Matches:\n%s\n' "${fragments[*]}"
	exit 1
	fi
	- name: Check if a changelog fragment has allowed type
	run: towncrier check

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