warning-count-comment.yml

name: warning-count-comment

on:
  workflow_run:
    workflows: ["CI"]
    types: [completed]

permissions:
  actions: read
  pull-requests: write
  contents: read

jobs:
  comment:
    if: github.event.workflow_run.event == 'pull_request'
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      REPO: ${{ github.repository }}
      PR_RUN: ${{ github.event.workflow_run.id }}
      HEAD_SHA: ${{ github.event.workflow_run.head_sha }}
    steps:
      - uses: actions/checkout@v4

      - name: Download this PR run's log archive
        run: gh api "repos/$REPO/actions/runs/$PR_RUN/logs" > pr-logs.zip

      - name: Download latest successful develop run's log archive
        run: |
          DEV=$(gh run list --workflow CI --branch develop --status success \
                  --limit 1 --json databaseId --jq '.[0].databaseId')
          if [ -z "$DEV" ]; then echo "no develop baseline run found" >&2; exit 1; fi
          echo "DEV_RUN=$DEV" >> "$GITHUB_ENV"
          gh api "repos/$REPO/actions/runs/$DEV/logs" > base-logs.zip

      - name: Generate table
        run: |
          {
            echo "Compiler-warning counts vs \`develop\` (auto-generated)."
            echo "PR run \`$PR_RUN\` vs develop run \`$DEV_RUN\` (\`${HEAD_SHA:0:10}\`)."
            echo
            python3 .github/scripts/warn_table.py base-logs.zip pr-logs.zip
          } > table.md

      - name: Resolve PR number
        id: pr
        run: |
          num=$(gh api "repos/$REPO/pulls?state=open&per_page=100" \
                  --jq "map(select(.head.sha==\"$HEAD_SHA\"))[0].number")
          if [ -z "$num" ]; then
            echo "no open PR found with head $HEAD_SHA" >&2
            exit 1
          fi
          echo "num=$num" >> "$GITHUB_OUTPUT"

      - name: Post or update sticky comment
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: warning-counts
          number: ${{ steps.pr.outputs.num }}
          path: table.md