name: pre-commit

on:
  push:
    branches:
      - master
  pull_request:

# Cancel in progress workflows on pull_requests.
# https://docs.github.com/en/actions/using-jobs/using-concurrency#example-using-a-fallback-value
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

defaults:
  run:
    # the default default is:
    #      bash --noprofile --norc -eo pipefail {0}
    shell: bash --noprofile --norc -eo pipefail -ux {0}

# hack for https://github.com/actions/cache/issues/810#issuecomment-1222550359
env:
  SEGMENT_DOWNLOAD_TIMEOUT_MINS: 3
  # workaround: secrets cannot be directly referenced in `if`
  # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-using-secrets
  SECRET_ACCESS: ${{toJSON(secrets.SENTRY_INTERNAL_APP_PRIVATE_KEY != null)}}

jobs:
  lint:
    name: pre-commit lint
    runs-on: ubuntu-20.04
    timeout-minutes: 10
    steps:
      - # get a non-default github token so that any changes are verified by CI
        if: env.SECRET_ACCESS == 'true'
        uses: getsentry/action-github-app-token@97c9e23528286821f97fba885c1b1123284b29cc # v2.0.0
        id: token
        with:
          app_id: ${{ vars.SENTRY_INTERNAL_APP_ID }}
          private_key: ${{ secrets.SENTRY_INTERNAL_APP_PRIVATE_KEY }}
      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
      - name: Get changed files
        id: changes
        uses: getsentry/paths-filter@4512585405083f25c027a35db413c2b3b9006d50 # v2.11.1
        with:
          # Enable listing of files matching each filter.
          # Paths to files will be available in `${FILTER_NAME}_files` output variable.
          list-files: json

          # It doesn't make sense to lint deleted files.
          # Therefore we specify we are only interested in added or modified files.
          filters: |
            all:
              - added|modified: '**/*'

      - uses: getsentry/action-setup-venv@9e3bbae3836b1b6f129955bf55a19e1d99a61c67 # v1.0.5
        with:
          python-version: 3.8.16
          cache-dependency-path: |
            requirements-dev.txt
            requirements-dev-frozen.txt
          install-cmd: pip install -r requirements-dev.txt -c requirements-dev-frozen.txt
      - uses: actions/cache@9b0c1fce7a93df8e3bb8926b0d6e9d89e92f20a7 # v3.0.11
        with:
          path: ~/.cache/pre-commit
          key: cache-epoch-1|${{ env.pythonLocation }}|${{ hashFiles('.pre-commit-config.yaml') }}
      - name: Setup pre-commit
        # We don't use make setup-git because we're only interested in installing
        # requirements-dev.txt as a fast path.
        # We don't need pre-commit install --install-hooks since we're just interested
        # in running the hooks.
        run: |
          pre-commit install-hooks

      - name: Run pre-commit on PR commits
        run: |
          jq '.[]' --raw-output <<< '${{steps.changes.outputs.all_files}}' |
            # Run pre-commit to lint and format check files that were changed (but not deleted) compared to master.
            xargs pre-commit run --files

      - name: Apply any pre-commit fixed files
        # note: this runs "always" or else it's skipped when pre-commit fails
        if: env.SECRET_ACCESS == 'true' && startsWith(github.ref, 'refs/pull') && always()
        uses: getsentry/action-github-commit@748c31dd78cffe76f51bef49a0be856b6effeda7 # v1.1.0
        with:
          github-token: ${{ steps.token.outputs.token }}
          message: ':hammer_and_wrench: apply pre-commit fixes'