check-links.yaml

name: check-links
on:
  push:
    branches: [main]
  pull_request:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref_name }}
  cancel-in-progress: true

permissions: read-all

jobs:
  changedfiles:
    name: changed files
    runs-on: ubuntu-latest
    env:
      PR_HEAD: ${{ github.event.pull_request.head.sha }}
    outputs:
      files: ${{ steps.changes.outputs.files }}
    steps:
      - name: Checkout Repo
        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
        with:
          fetch-depth: 0
      - name: Get changed files
        id: changes
        run: |
          files=$(git diff --name-only --diff-filter=ACMRTUXB $(git merge-base origin/main $PR_HEAD) $PR_HEAD | grep .md$ | xargs)

          if [ -z "$files" ] && git diff --name-only $(git merge-base origin/main $PR_HEAD) $PR_HEAD | grep -q "package.json"; then
            files="**/*.md"
          fi

          echo "files=$files" >> $GITHUB_OUTPUT
  check-links:
    runs-on: ubuntu-latest
    needs: changedfiles
    if: ${{needs.changedfiles.outputs.files}}
    steps:
      - name: Checkout Repo
        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
        with:
          fetch-depth: 0

      - name: Link Checker
        id: lychee
        uses: lycheeverse/lychee-action@a8c4c7cb88f0c7386610c35eb25108e448569cb0
        with:
          args: "--verbose --no-progress ${{needs.changedfiles.outputs.files}} --config .github/lychee.toml"
          failIfEmpty: false