Checkstyle GitHub Action

Runs checkstyle with reviewdog on pull requests. This modification also provides some metrics for tracking the issues found with checkstyle, these are provided in the 'output' folder:

/github/workspace/src/RunMe.java:10:0: error: Tabs in line (com.puppycrawl.tools.checkstyle.checks.regexp.RegexpSinglelineJavaCheck)
/github/workspace/src/RunMe.java:11:0: error: Tabs in line (com.puppycrawl.tools.checkstyle.checks.regexp.RegexpSinglelineJavaCheck)
/github/workspace/src/RunMe.java:13:0: error: Line matches the illegal pattern 'Trailing whitespace'. (com.puppycrawl.tools.checkstyle.checks.regexp.RegexpCheck)
/github/workspace/src/TestThree.java:4:0: error: Line matches the illegal pattern 'Trailing whitespace'. (com.puppycrawl.tools.checkstyle.checks.regexp.RegexpCheck)      

raferg, 57/merge, 1, 02de945736ccf8da66584adb206df5fd2397dc04
2 : error: Line matches the illegal pattern 'Trailing whitespace'. 
2 : error: Tabs in line     

Example:

Input

checkstyle_config

Required. Checkstyle config Default is google_checks.xml (sun_checks.xml is also built in and available).

file_list

Required. If not provided then no files will be processed by Checkstyle

level

Optional. Report level for reviewdog [info,warning,error]. It's same as -level flag of reviewdog.

reporter

Optional. Reporter of reviewdog command [github-pr-check,github-pr-review]. It's same as -reporter flag of reviewdog.

filter_mode

Optional. Filtering mode for the reviewdog command [added,diff_context,file,nofilter]. Default is added.

fail_on_error

Optional. Exit code for reviewdog when errors are found [true,false]. Default is false.

Important: this feature only works when level is set to error.

tool_name

Optional. Tool name to use for reviewdog reporter. Default is 'reviewdog'.

checkstyle_version

Optional. Checkstyle version to use. Default is 8.40

properties_file

Optional. Properties file relative to the root directory.

Example usage

name: Checkstyle with attempt at logging

on:
  pull_request:
    branches: [ master ]
jobs:
  run-lint:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@v17.2
      - uses: raferg/checkstyle-action@master
        id: checkStyleRaferg
        with:
          github_token: ${{ secrets.github_token }}
          reporter: github-pr-review
          checkstyle_config: .checkstyle/checkstyle.xml
          level: error
          fail_on_error: true
          filter_mode: added
          file_list: ${{ steps.changed-files.outputs.all_changed_files }}
      - name: echo violations
        run: echo "${{ steps.checkStyleRaferg.outputs.total_volations }}"
      
      - name: 'Upload Artifact(s)'
        uses: actions/upload-artifact@v2
        with:
          name: checkstyle
          path: output/*