diff.yml

name: Diff
on:
  issue_comment:
    types: [created]

jobs:
  generate:
    name: |
      Generate matrix.
    runs-on: ubuntu-latest
    outputs:
      diffs: ${{ steps.regress-ci.outputs.diffs }}
    if: contains(toJson(github.event.comment.body), '\n/ci') || startsWith(github.event.comment.body, '/ci')
    steps:
      - name: Is member
        run: |
          if [[ "${{ github.event.comment.author_association }}" != "MEMBER" && "${{ github.event.comment.author_association }}" != "OWNER" ]]; then
            exit 1
          fi

      - uses: actions/checkout@v4

      - uses: dtolnay/rust-toolchain@master
        with:
          toolchain: stable

      - name: Cache
        uses: Swatinem/rust-cache@v2
        with:
          shared-key: "diff"

      - run: cargo regress ci
        id: regress-ci
        env:
          GITHUB_COMMENT: ${{ github.event.comment.body }}
          GITHUB_COMMENT_PR: ${{ github.event.issue.number }}
  diff:
    runs-on: ubuntu-latest
    needs: [generate]
    if: needs.generate.outputs.diffs != '{}' && needs.generate.outputs.diffs != '[]' && needs.generate.outputs.diffs != ''
    strategy:
      matrix:
        include: ${{ fromJson(needs.generate.outputs.diffs) }}
    steps:
      - uses: actions/checkout@v4

      - uses: dtolnay/rust-toolchain@master
        with:
          toolchain: stable

      - name: Cache
        uses: Swatinem/rust-cache@v2
        with:
          shared-key: "diff"

      - uses: taiki-e/install-action@v2
        if: matrix.needs_semver_checks
        with:
          tool: cargo-semver-checks

      - uses: taiki-e/install-action@v2
        with:
          tool: git-delta

      # if a new line is added here, make sure to update the `summary` job to reference the new step index
      - run: cargo regress diff --use-pager-directly ${{ matrix.command }}
        env:
          GH_TOKEN: ${{ github.token }}
          GITHUB_PR: ${{ matrix.pr }}
          GIT_PAGER: delta --raw
  summary:
    runs-on: ubuntu-latest
    needs: [diff, generate]
    if: always() && needs.generate.outputs.diffs != '{}' && needs.generate.outputs.diffs != '[]' && needs.generate.outputs.diffs != '' && needs.generate.result == 'success'
    steps:
      - uses: actions/checkout@v4

      - run: |
          gh run view ${{ github.run_id }} --json jobs | \
          jq -r '"Diff for [comment]("+$comment+")\n\n" + ([.jobs[] | select(.name | startswith("diff")) | "- [" + (.name | capture("\\((?<name>[^,]+),.*") | .name) + "](" + .url + "?pr=" + $pr_id + "#step:7:47)"] | join("\n"))' --arg pr_id "${{ github.event.issue.number }}" --arg comment "${{ github.event.comment.url }}"| \
          gh pr comment "${{ github.event.issue.number }}" --body "$(< /dev/stdin)"
        env:
          GH_TOKEN: ${{ github.token }}