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Viacheslav Poturaev
Viacheslav Poturaev

Posted on • Updated on

Changed lines of code by language in GitHub pull request

Keeping pull requests small is generally a good idea, and often checking the number of changed lines is the first step in code review.

Unfortunately, keeping the number of changed lines small is not always feasible. For a few lines of an actual program changes you may need to supply a large body of mocked data, generated code, documentation changes, tests and other resources.

For example you have received a PR for review.
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Looks pretty big at glance.

A breakdown of changes into several groups may help to get a better understanding of the scope of the changes.

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And then you can see that most of the changes in this PR are generated Go code, which may be reviewed with less caution.

Such a comment can be added to a PR using GitHub Action and a small tool built on top of an awesome scc.

name: cloc
on:
  pull_request:

# Cancel the workflow in progress in newer build is about to start.
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

jobs:
  cloc:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          path: pr
      - name: Checkout base code
        uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.base.sha }}
          path: base
      - name: Count Lines Of Code
        id: loc
        run: |
          curl -sLO https://github.com/vearutop/sccdiff/releases/download/v1.0.3/linux_amd64.tar.gz && tar xf linux_amd64.tar.gz
          sccdiff_hash=$(git hash-object ./sccdiff)
          [ "$sccdiff_hash" == "ae8a07b687bd3dba60861584efe724351aa7ff63" ] || (echo "::error::unexpected hash for sccdiff, possible tampering: $sccdiff_hash" && exit 1)
          OUTPUT=$(cd pr && ../sccdiff -basedir ../base)
          echo "${OUTPUT}"
          OUTPUT="${OUTPUT//$'\n'/%0A}"
          echo "::set-output name=diff::$OUTPUT"

      - name: Comment Code Lines
        continue-on-error: true
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          header: LOC
          message: |
            ### Lines Of Code

            ${{ steps.loc.outputs.diff }}
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