name: Spell checking
on:
  push:
    branches: ["**"]
    tags-ignore: ["**"]
  pull_request_target:
  issue_comment:
    types: [created]

jobs:
  spelling:
    name: Spell checking
    permissions:
      contents: read
      pull-requests: read
    outputs:
      internal_state_directory: ${{ steps.spelling.outputs.internal_state_directory }}
    runs-on: ubuntu-latest
    if: "contains(github.event_name, 'pull_request') || github.event_name == 'push'"
    concurrency:
      group: spelling-${{ github.event.pull_request.number || github.ref }}
      # note: If you use only_check_changed_files, you do not want cancel-in-progress
      cancel-in-progress: true
    steps:
    - name: checkout-merge
      if: "contains(github.event_name, 'pull_request')"
      uses: actions/checkout@v2
      with:
        ref: refs/pull/${{github.event.pull_request.number}}/merge
    - name: checkout
      if: github.event_name == 'push'
      uses: actions/checkout@v2
    - name: find aliases
      run: |
        for a in $(git ls-files|grep '\.zsh$'); do
          echo "-- $a"
          if [ -s "$a" ]; then
            perl -ne 'next unless s/^alias ([A-Za-z]{3,})=.*/$1/;print' "$a" | tee -a .github/actions/spelling/allow.txt
          fi
        done;
    - name: check-spelling
      id: spelling
      uses: check-spelling/check-spelling@prerelease
      with:
        experimental_apply_changes_via_bot: 1
        suppress_push_for_open_pull_request: 1
        post_comment: 0
    - name: store-comment
      if: failure()
      uses: actions/upload-artifact@v2
      with:
        retention-days: 1
        name: "check-spelling-comment-${{ github.run_id }}"
        path: |
          ${{ steps.spelling.outputs.internal_state_directory }}

  comment:
    name: Comment
    runs-on: ubuntu-latest
    needs: spelling
    permissions:
      contents: write
      pull-requests: write
    if: always() && needs.spelling.result == 'failure' && needs.spelling.outputs.internal_state_directory
    steps:
    - name: checkout
      uses: actions/checkout@v2
    - name: set up
      run: |
        mkdir /tmp/data
    - name: retrieve-comment
      uses: actions/download-artifact@v2
      with:
        name: "check-spelling-comment-${{ github.run_id }}"
        path: /tmp/data
    - name: comment
      uses: check-spelling/check-spelling@prerelease
      with:
        experimental_apply_changes_via_bot: 1
        custom_task: comment
        internal_state_directory: /tmp/data

  update:
    name: Update PR
    permissions:
      contents: write
      pull-requests: write
    runs-on: ubuntu-latest
    if: ${{
        github.event_name == 'issue_comment' &&
        github.event.issue.pull_request &&
        contains(github.event.comment.body, '@check-spelling-bot apply')
      }}
    concurrency:
      group: spelling-update-${{ github.event.issue.number }}
      cancel-in-progress: false
    steps:
    - name: checkout
      uses: actions/checkout@v2
    - name: check-spelling
      uses: check-spelling/check-spelling@prerelease
      with:
        experimental_apply_changes_via_bot: 1