name: CI

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest  # windows-latest | macos-latest
    name: Test changed-files
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0  # OR "2" -> To retrieve the preceding commit.
      
      - name: Get changed files
        id: changed-files
        uses: tj-actions/[email protected]
      
      - name: List all modified files
        run: |
          for file in "${{ steps.changed-files.outputs.all_modified_files }}"; do
            echo "$file was modified"
          done

...
    steps:
      - uses: actions/checkout@v2

      - name: Get changed files using defaults
        id: changed-files
        uses: tj-actions/[email protected]
      
      - name: Get changed files using a comma separator
        id: changed-files-comma
        uses: tj-actions/[email protected]
        with:
          separator: ","

      - name: List all added files
        run: |
          for file in "${{ steps.changed-files.outputs.added_files }}"; do
            echo "$file was added"
          done

      - name: Run step when a file changes
        if: contains(steps.changed-files.outputs.modified_files, 'my-file.txt')
        run: |
          echo "Your file my-file.txt has been modified."

      - name: Run step when a file has been deleted
        if: contains(steps.changed-files.outputs.deleted_files, 'test.txt')
        run: |
          echo "Your test.txt has been deleted."

      - name: Get specific changed files
        id: changed-files-specific
        uses: tj-actions/[email protected]
        with:
          files: |
            my-file.txt
            test.txt
            new.txt
            test_directory
            .(png|jpeg)$   
            .(sql)$
            ^(mynewfile|custom)

      - name: Run step if any of the listed files above change
        if: steps.changed-files-specific.outputs.any_changed == 'true'
        run: |
          echo "One or more files listed above has changed."
      
      - name: Use a source file or list of file(s) to populate to files input.
        id: changed-files-specific-source-file
        uses: tj-actions/[email protected]
        with:
          files_from_source_file: |
            test/changed-files-list.txt

      - name: Use a source file or list of file(s) to populate to files input and optionally specify more files.
        id: changed-files-specific-source-file-and-specify-files
        uses: tj-actions/[email protected]
        with:
          files_from_source_file: |
            test/changed-files-list.txt
          files: |
            .github/workflows/rebase.yml

      - name: Use a different commit SHA
        id: changed-files-custom-sha
        uses: tj-actions/[email protected]
        with:
          sha: ${{ github.event.pull_request.head.sha }}
          
      - name: Use a different base SHA
        id: changed-files-custom-base-sha
        uses: tj-actions/[email protected]
        with:
          base_sha: "2096ed0"
        

...
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
      
      - name: Get changed files
        id: changed-files
        uses: tj-actions/[email protected]

      - name: Pre-commit
        uses: pre-commit/[email protected]
        with:
          extra_args: -v --hook-stage push --files ${{ steps.changed-files.outputs.all_modified_files }}
          token: ${{ secrets.github_token }}