gemfile version does not work because of pcregrep not found

[Slike9]

gemfile version does not work because of "pcregrep: not found"

/home/runner/work/_actions/reviewdog/action-rubocop/master/script.sh: 24: /home/runner/work/_actions/reviewdog/action-rubocop/master/script.sh: pcregrep: not found
  Cannot get the rubocop's version from Gemfile.lock. The latest version will be installed.

Tested on v1 and master. Seems the problem started from v1.8, after migrating from Dockerfile.

GH-workflow config:

name: Lint
on:
  pull_request:
jobs:
  ruby:
    name: Ruby
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v2
      - uses: ruby/setup-ruby@v1
      - name: Run Rubocop
        uses: reviewdog/action-rubocop@master
        with:
          rubocop_version: gemfile
          rubocop_extensions: rubocop-rails:gemfile
          github_token: ${{ secrets.github_token }}
          reporter: github-pr-review

Problem screenshot:

Action: https://github.com/Slike9/rails-test-prj/runs/1938560595?check_suite_focus=true

Possible solutions:

• Just add a note to README that you need to install pcregrep to use gemfile version in your GH-workflow.
• The action can install pcregrep for us. There are problems with portability. We can use some portable way of installing the tool. Or we can stick with ubuntu for example.
• Use something else then pcregrep, something more ubiquitous. Suspect we can use sed, grep, a Ruby-script, smth else there.
• smth else ...

[Slike9]

Using Ruby one-liner:

RUBOCOP_GEMFILE_VERSION=$(ruby -ne 'print $& if /^\s{4}rubocop\s\(\K.*(?=\))/' Gemfile.lock)

[mgrachev]

@Slike9 Hey 👋 Thank you for your help!

[mgrachev]

Fixed in v1.8.1. Thanks ✌️