valid-links.yml

name: CI

on:
  push:
  pull_request:
  workflow_dispatch:

env:
  DOTNET_CLI_TELEMETRY_OPTOUT: true

jobs:
  verify-links:
    name: Check for dead links
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - run: |
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
          git config --global user.name "github-actions[bot]"
          git fetch origin master
          git merge origin/master

      - name: Install .NET 5.0.x
        uses: actions/setup-dotnet@v1
        with:
          dotnet-version: '5.0.x'

      - name: Install MarkdownLinkChecker
        run: dotnet tool install -g markdownlinkchecker

      - name: Verify links
        run: |
          deleted_or_renamed=$(git diff --no-commit-id --name-only --diff-filter DR origin/master | grep  -i .md$ | grep -v -i _sidebar.md | grep -v -i ISSUE_TEMPLATE | wc -l)

          if [ "${{ secrets.ACTIONS_STEP_DEBUG }}" = "true" ]; then
              debug_level="detailed"
          else
              debug_level="minimal"
          fi

          if [ "$GITHUB_REF" = "refs/heads/master" ] || [[ $deleted_or_renamed -ne 0 ]]
          then
              echo "Searching all files..."
              markdownlinkchecker -m files -v "$debug_level"
          else
              files=$(git diff --no-commit-id --name-only --diff-filter AM origin/master | grep  -i .md$ | grep -v -i _sidebar.md | grep -v -i ISSUE_TEMPLATE | cat)
              echo "Searching changed files: $files"

              if [[ -n $files ]]; then
                # shellcheck disable=SC2086
                markdownlinkchecker -m files -v "$debug_level" -f $files
              fi
          fi