This is a GitHub action to run Checkstyle checks on your Java code and report the status via reviewdog on pull requests.

An example of how the reported Checkstyle violations will look on a pull request is shown below (link to example PR):

name: reviewdog
on: [pull_request]
jobs:
  checkstyle:
    name: runner / checkstyle
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dbelyaev/action-checkstyle@master
        with:
          github_token: ${{ secrets.github_token }}
          reporter: github-pr-review
          level: warning

• checkstyle_config

  Checkstyle configuration specifies which ruleset to apply during the scan.
  There are two built-in configurations:

  • google_checks.xml config for the Google coding conventions
  • sun_checks.xml config for the Sun coding conventions

  It is also possible to supply your custom Checkstyle configuration file located in the same directory.

  Default: google_checks.xml

  Example:

  name: reviewdog
  on: [pull_request]
  jobs:
    checkstyle:
      name: runner / checkstyle
      runs-on: ubuntu-latest
      steps:
        - uses: actions/checkout@v4
        - uses: dbelyaev/action-checkstyle@master
          with:
            github_token: ${{ secrets.github_token }}
            reporter: github-pr-review
            checkstyle_config: sun_checks.xml

  Link to example PR.

• checkstyle_version

  Checkstyle version to be used during analysis.

  For a list of available version numbers, go to the Checkstyle release page.

  IMPORTANT NOTE
  This field will always try to follow Checkstyle releases as closely as possible and will use the latest available version by default.

  If the default preference is not suitable for your project, please pin the needed version using this property.

  Default: latest available

  Example:

  name: reviewdog
  on: [pull_request]
  jobs:
    checkstyle:
      name: runner / checkstyle
      runs-on: ubuntu-latest
      steps:
        - uses: actions/checkout@v4
        - uses: dbelyaev/action-checkstyle@master
          with:
            github_token: ${{ secrets.github_token }}
            reporter: github-pr-review
            checkstyle_version: "9.0" # double quotes important here

• workdir

  The working directory relative to the root directory.

  Default: '.' (root)

• properties_file

  Location of the properties file relative to the root directory.

  This file serves as a means to resolve repetitive or predefined values within the checkstyle configuration file.

  Default: '' (empty)

  Example:

  name: reviewdog
  on: [pull_request]
  jobs:
    checkstyle:
      name: runner / checkstyle
      runs-on: ubuntu-latest
      steps:
        - uses: actions/checkout@v4
        - uses: dbelyaev/action-checkstyle@master
          with:
            github_token: ${{ secrets.github_token }}
            reporter: github-pr-review
            checkstyle_config: ./properties_file/test_checks.xml
            properties_file: ./properties_file/additional.properties

  Link to example PR.

• level

  Report level for the reviewdog command.

  Values: [info, warning, error]

  You can control GitHub status check result with this feature.

  Level	GitHub Status
  info	neutral
  warning	neutral
  error	failure

  Default: info

• reporter

  Reporter for the reviewdog command.

  For more information, check reviewdog / reporters documentation.

  Values: [github-pr-check, github-check, github-pr-review]

  Default: github-pr-check

• filter_mode

  Filtering mode for the reviewdog command.

  For more information, check reviewdog / filter-mode documentation.

  Values: [added, diff_context, file, nofilter]

  Default: added

• fail_on_error

  Exit code for reviewdog when errors are found.

  Values: [true, false]

  Default: false

• reviewdog_flags

  Additional reviewdog flags.

  Default: ``