size-comment.yml

name: "Size: Comment"

# read-write repo token
# access to secrets
#
# https://securitylab.github.com/resources/github-actions-preventing-pwn-requests/
on:
  workflow_dispatch:
    inputs:
      RUN_ID:
        description: Which workflow run to get artifacts from
        required: true
        type: string
  workflow_run:
    workflows: ["Size: PR"]
    types:
      - completed

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

jobs:
  compare_sizes:
    name: 'Compare Sizes and Comment'
    runs-on: 'ubuntu-latest'

    steps:
      # better `du`
      - run: sudo snap install dust

      - uses: dawidd6/action-download-artifact@v9
        with:
          run_id: ${{ inputs.RUN_ID || github.event.workflow_run.id }}
          workflow: size-pr.yml
          path: pr
          if_no_artifact_found: fail

      - uses: dawidd6/action-download-artifact@v9
        with:
          name: sizes-main
          path: main
          workflow: size-main.yml
          if_no_artifact_found: fail

      - name: "[Debug] artifacts' files"
        run: |
          ls -la ./main
          ls -la ./pr/**

      - name: "[PR] Get path of size output txt file"
        id: find-pr-txt
        run: |
          cd pr/
          filePath=$(find . -name "out.txt")
          echo $filePath
          echo "txtPath=pr/$filePath" >> $GITHUB_OUTPUT

      - name: "[PR] Get PR number"
        id: find-pr-number
        run: |
          cd pr/
          filePath=$(find . -name "NR")
          contents=$(cat $filePath)
          echo $filePath
          echo $contents
          echo "prNumber=$contents" >> $GITHUB_OUTPUT

      - name: "[PR] Get sizes for development outputs"
        id: dev
        run: |
          cat ${{ steps.find-pr-txt.outputs.txtPath }}
          echo 'sizes<<EOF' >> $GITHUB_OUTPUT
          while IFS= read -r line; do
              echo "$line" >> $GITHUB_OUTPUT
          done <<< $(cat ${{ steps.find-pr-txt.outputs.txtPath }})
          echo 'EOF' >> $GITHUB_OUTPUT

      - name: "[Main] Get sizes for development outputs"
        id: main-dev
        run: |
          cd main/
          cat out.txt

          echo 'sizes<<EOF' >> $GITHUB_OUTPUT
          while IFS= read -r line; do
              echo "$line" >> $GITHUB_OUTPUT
          done <<< $(cat out.txt)
          echo 'EOF' >> $GITHUB_OUTPUT

      - name: "[Dev] calculate diff"
        run: |
          # diff exits with status 1 if there is a diff
          diff -u main/out.txt ${{ steps.find-pr-txt.outputs.txtPath }} > dev-diff.txt || echo "Differences exist"
          cat dev-diff.txt

      - name: "[Dev] store diff in GITHUB_OUTPUT"
        id: dev-diff
        run: |
          echo 'diffText<<EOF' >> $GITHUB_OUTPUT
          while IFS= read -r line; do
              echo "$line" >> $GITHUB_OUTPUT
          done <<< $(cat ./dev-diff.txt)
          echo 'EOF' >> $GITHUB_OUTPUT



      - name: "[Debug] collected data from artifacts"
        run: |
          echo "PR number"
          echo -e "${{ steps.find-pr-number.outputs.prNumber }}"

          echo "Main out.txt"
          echo -e "${{ steps.main-dev.outputs.sizes }}"

          echo "PR out.txt"
          echo -e "${{ steps.dev.outputs.sizes }}"

          echo "Dev diff"
          echo -e "${{ steps.dev-diff.outputs.diffText }}"


      #########################
      # Intended Layout:
      #
      #  |      | This PR | Main |
      #  | Dev  |   x1    |  y1  |
      #  | Prod |   x2    |  y2  |
      #
      #  NOTE: we we don't have a prod build for this library
      #        because we currently expect non-compiler usage
      #        (so consumers should have terser or similar properly configured for DCE)
      #
      #########################
      - uses: mshick/add-pr-comment@v2
        with:
          issue: ${{ steps.find-pr-number.outputs.prNumber }}
          message: |
            <details><summary>Development Assets</summary>

            Diff

            ```diff
            ${{ steps.dev-diff.outputs.diffText }}
            ```

            Details

            <table><thead><tr><th></th><th>This PR</th><th>main</th></tr></thead>
            <tbody>
            <tr><td>Dev</td><td>

            ```
            ${{ steps.dev.outputs.sizes }}
            ```

            </td><td>

            ```
            ${{ steps.main-dev.outputs.sizes }}
            ```

            </td></tr>
            </tbody></table>
            </details>



        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}