misskey/.github/workflows/report-api-diff.yml

name: Report API Diff

on:
  workflow_run:
    types: [completed]
    workflows:
      - Get api.json from Misskey # get-api-diff.yml

jobs:
  compare-diff:
    runs-on: ubuntu-latest
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    permissions:
      pull-requests: write

# api-artifact
    steps:
      - name: Download artifact
        uses: actions/github-script@v6
        with:
          script: |
            let allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: context.payload.workflow_run.id,
            });
            let matchArtifact = allArtifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "api-artifact"
            })[0];
            let download = await github.rest.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            let fs = require('fs');
            fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/api-artifact.zip`, Buffer.from(download.data));
      - name: Extract artifact
        run: unzip api-artifact.zip -d artifacts
      - name: Load PR Number
        id: load-pr-num
        env:
          PULL_REQUESTS: ${{ toJson(github.event.workflow_run.pull_requests.*) }}
          REPO_ID: ${{ github.repository_id }}
        run: |
          # find first pull requests that targets this repository
          PR_NUMBER="$(echo "$PULL_REQUESTS"
              | jq --arg REPO_ID "$REPO_ID" '[.[] | select ($REPO_ID == (.base.repo.id | tostring)) | .id ][0]')"
          echo "pr-number=$PR_NUMBER" >> "$GITHUB_OUTPUT"

      - name: Output base
        run: cat ./artifacts/api-base.json
      - name: Output head
        run: cat ./artifacts/api-head.json
      - name: Arrange json files
        run: |
          jq '.' ./artifacts/api-base.json > ./api-base.json
          jq '.' ./artifacts/api-head.json > ./api-head.json
      - name: Get diff of 2 files
        run: diff -u --label=base --label=head ./api-base.json ./api-head.json | cat > api.json.diff
      - name: Get full diff
        run: diff --label=base --label=head --new-line-format='+%L' --old-line-format='-%L' --unchanged-line-format=' %L' ./api-base.json ./api-head.json | cat > api-full.json.diff
      - name: Echo full diff
        run: cat ./api-full.json.diff
      - name: Upload full diff to Artifact
        uses: actions/upload-artifact@v3
        with:
          name: api-artifact
          path: |
            api-full.json.diff
            api-base.json
            api-head.json
      - id: out-diff
        name: Build diff Comment
        run: |
          cat <<- EOF > ./output.md
          このPRによるapi.jsonの差分
          <details>
          <summary>差分はこちら</summary>

          \`\`\`diff
          $(cat ./api.json.diff)
          \`\`\`
          </details>

          [Get diff files from Workflow Page](https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID})
          EOF
      - uses: thollander/actions-comment-pull-request@v2
        with:
          pr_number: ${{ steps.load-pr-num.outputs.pr-number }}
          comment_tag: show_diff
          filePath: ./output.md