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---

name: PR Labels

# Each PR must carry exactly one of the labels release-drafter knows

# how to slot into a release-notes section. We derive that label from

# the "Types of changes" checkbox in the PR template and apply it

# automatically — most external contributors can't label their own

# PRs. The job only fails when no checkbox is ticked.

# yamllint disable-line rule:truthy

on:

pull_request_target:

types:

- opened

- edited

- synchronize

- labeled

- unlabeled

branches:

- main

permissions:

pull-requests: write

jobs:

apply_label:

name: Apply

runs-on: ubuntu-latest

if: github.event.pull_request.state == 'open'

steps:

- name: 🏷 Apply label from PR description checkbox

uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0

with:

script: |

const known = [

'breaking-change', 'bugfix', 'refactor',

'new-feature', 'enhancement', 'maintenance',

'ci', 'dependencies', 'docs',

];

// Match `- [x] ... `<label>`` lines in the PR body. The

// PR template puts the canonical label name in backticks

// at the end of each "Types of changes" bullet.

const body = context.payload.pull_request.body || '';

const re = /^\s*-\s*\[x\][^`\n]*`([^`]+)`/gim;

const ticked = [];

for (const m of body.matchAll(re)) {

const name = m[1];

if (known.includes(name) && !ticked.includes(name)) {

ticked.push(name);

}

}

const { owner, repo } = context.repo;

const issue_number = context.payload.pull_request.number;

if (ticked.length === 0) {

core.setFailed(

'No "Types of changes" checkbox is ticked in the PR ' +

'description. Edit the description and tick exactly ' +

'one box so this PR can be release-noted.'

);

return;

}

if (ticked.length > 1) {

core.setFailed(

`Multiple "Types of changes" checkboxes are ticked ` +

`(${ticked.join(', ')}). Tick exactly one.`

);

return;

}

const desired = ticked[0];

const current = (context.payload.pull_request.labels || [])

.map(l => l.name);

// Strip any stale labels from the known set so a

// contributor changing their mind in the description

// doesn't leave the previous label behind.

for (const name of current) {

if (known.includes(name) && name !== desired) {

await github.rest.issues.removeLabel({

owner, repo, issue_number, name,

}).catch(() => {});

}

}

if (!current.includes(desired)) {

await github.rest.issues.addLabels({

owner, repo, issue_number, labels: [desired],

});

}