Check uniqueness of version number #107

	name: Versioning
	run-name: "Check uniqueness of version number"

	on: [ pull_request ]

	jobs:
	Version-Uniqueness-Check:
	runs-on: ubuntu-latest
	steps:
	- name: 😎 Checkout
	uses: actions/checkout@main

	- name: 🐍 Set up Python 3.12
	uses: actions/setup-python@v5
	with:
	python-version: 3.12

	- name: 👩‍🎨 Setup Poetry
	run: pip install poetry

	# The following steps will:
	# - Fetch the current package version
	# - Check if the version already exists in the repository and fail the workflow if it does
	- name: 🦑 Fetch package version
	run: \|
	echo "CURRENT_VERSION=v$(poetry version --short)" >> $GITHUB_ENV
	echo "Version = v$(poetry version --short)"

	# Should only run during a pull request event into the main branch.
	# This will check if the version already exists in the registry.
	- name: 🦔 Fail if release version exists
	uses: actions/github-script@v7
	if:
	github.event_name == 'pull_request' &&
	github.event.pull_request.base.ref == 'main'
	with:
	script: \|
	const tags = await github.rest.repos.listTags({
	owner: context.repo.owner,
	repo: context.repo.repo,
	});

	for (const tag of tags.data) {
	if (tag.name === process.env.CURRENT_VERSION) {
	const msg = `Version ${{ env.CURRENT_VERSION }} already exists as a release! Update the version number according to [SemVer](https://semver.org). For example: 'poetry version minor' or 'poetry version patch'.`
	core.setFailed(msg);
	}
	}

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