bundle-comment.yml

name: Bundle Size Comment
on:
  workflow_run:
    workflows: ["Check"]
    types:
      - completed

concurrency:
  group: ${{ github.workflow }}-${{ github.event.workflow_run.head_repository.full_name }}-${{ github.event.workflow_run.head_branch }}
  cancel-in-progress: true

permissions: {}

jobs:
  comment:
    name: Bundle
    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    permissions:
      actions: read
      pull-requests: write
    timeout-minutes: 1
    steps:
      - name: Download Artifact
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: bundle-stats
          path: bundle-stats
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ secrets.GITHUB_TOKEN }}
      - name: Get stats
        id: stats
        run: |
          max_bytes=48000
          max_lines=500
          stats_source="bundle-stats/stats.txt"
          stats_file="$(mktemp)"
          trap 'rm -f "${stats_file}"' EXIT
          export LC_ALL=C

          source_valid=true
          if [ -f "${stats_source}" ] && [ ! -L "${stats_source}" ]; then
            head -c "$((max_bytes + 1))" "${stats_source}" > "${stats_file}"
          else
            source_valid=false
          fi

          byte_count="$(wc -c < "${stats_file}")"
          line_count="$(awk 'END { print NR + 0 }' "${stats_file}")"
          delimiter="EOF_$(openssl rand -hex 16)"

          {
            echo "stats<<${delimiter}"
            if [ "${source_valid}" != true ]; then
              echo "Bundle size report artifact was missing or invalid and was not displayed."
            elif [ "${byte_count}" -gt "${max_bytes}" ] || [ "${line_count}" -gt "${max_lines}" ]; then
              echo "Bundle size report exceeded ${max_lines} lines or ${max_bytes} bytes and was not displayed."
            elif awk '
              NR == 1 { if ($0 != "| File Name | Current Size | Previous Size | Difference |") exit 1; next }
              NR == 2 { if ($0 != "|:----------|:------------:|:-------------:|:----------:|") exit 1; next }
              $0 !~ /^\| `[[:alnum:]_.-]+` \| [0-9]+\.[0-9][0-9] KB \| [0-9]+\.[0-9][0-9] KB \| [+-]?[0-9]+\.[0-9][0-9] KB \([+-]?[0-9]+\.[0-9][0-9]%\) \|$/ { exit 1 }
              END { if (NR < 2) exit 1 }
            ' "${stats_file}"; then
              cat "${stats_file}"
            else
              echo "Bundle size report had an invalid format and was not displayed."
            fi
            echo "${delimiter}"
          } >> "${GITHUB_OUTPUT}"
      # https://github.com/orgs/community/discussions/25220#discussioncomment-11300118
      - name: Get PR number
        id: pr-context
        env:
          GH_TOKEN: ${{ github.token }}
          PR_TARGET_REPO: ${{ github.repository }}
          PR_BRANCH: |-
            ${{
              (github.event.workflow_run.head_repository.owner.login != github.event.workflow_run.repository.owner.login)
                && format('{0}:{1}', github.event.workflow_run.head_repository.owner.login, github.event.workflow_run.head_branch)
                || github.event.workflow_run.head_branch
            }}
        run: gh pr view --repo "${PR_TARGET_REPO}" "${PR_BRANCH}" --json 'number' --jq '"number=\(.number)"' >> "${GITHUB_OUTPUT}"
      - name: Find Comment
        id: find-comment
        uses: peter-evans/find-comment@b30e6a3c0ed37e7c023ccd3f1db5c6c0b0c23aad # v4
        with:
          issue-number: ${{ steps.pr-context.outputs.number }}
          comment-author: "github-actions[bot]"
          body-includes: <!-- This comment was auto-generated by GitHub Actions to display bundle size statistics -->
      - name: Create Comment
        id: comment
        uses: peter-evans/create-or-update-comment@e8674b075228eee787fea43ef493e45ece1004c9 # v5
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          BUNDLE_STATS: "${{ steps.stats.outputs.stats }}"
        with:
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          issue-number: ${{ steps.pr-context.outputs.number }}
          edit-mode: replace
          body: |
            <!-- This comment was auto-generated by GitHub Actions to display bundle size statistics -->
            ## Bundle Size Analysis
            Generated from PR build output; treat the content below as untrusted.

            ${{ env.BUNDLE_STATS }}