# name: Backport on Comment

# # Example use: /backport llvm_release_190
# on:
#   issue_comment:
#     types: [created]

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

# jobs:
#   backport:
#     if: >
#       github.event.issue.pull_request != null &&
#       startsWith(github.event.comment.body, '/backport ')
#     runs-on: ubuntu-latest

    # steps:
    #   - name: Checkout repository
    #     uses: actions/checkout@v5
    #     with:
    #       fetch-depth: 0

#       - name: Configure Git
#         run: |
#           git config user.name "${{ github.actor }}"
#           git config user.email "${{ github.actor }}@users.noreply.github.com"

#       - name: Ensure PR is merged
#         uses: actions/github-script@v7
#         with:
#           script: |
#             const pr = await github.rest.pulls.get({
#               owner: context.repo.owner,
#               repo: context.repo.repo,
#               pull_number: context.issue.number
#             });
#             if (!pr.data.merged) {
#               core.setFailed('PR #' + context.issue.number + ' is not merged.');
#             }

#       - name: Parse backport command
#         uses: actions/github-script@v7
#         with:
#           github-token: ${{ secrets.GITHUB_TOKEN }}
#           result-encoding: string
#           script: |
#             const body = context.payload.comment.body.trim();
#             const msg = body.match(/^\/backport\s+(llvm_release_[0-9]+)$/);
#             if (!msg) {
#               await github.rest.issues.createComment({
#                 owner: context.repo.owner,
#                 repo:  context.repo.repo,
#                 issue_number: context.issue.number,
#                 body: 'Invalid backport command. Expected `/backport llvm_release_<digits>`'
#               });
#               throw new Error('Invalid backport command.');
#             }
#             core.exportVariable('TARGET', msg[1]);

#       - name: Notify attempt
#         uses: actions/github-script@v7
#         with:
#           script: |
#             const target = process.env.TARGET;
#             await github.rest.issues.createComment({
#               owner: context.repo.owner,
#               repo: context.repo.repo,
#               issue_number: context.issue.number,
#               body: `Attempting to create backport to \`${target}\`...`
#             });

#       - name: Create backport branch
#         run: |
#           git fetch origin ${{ env.TARGET }}:${{ env.TARGET }}
#           git checkout -b backport/pr-${{ github.event.issue.number }}-to-${{ env.TARGET }} origin/${{ env.TARGET }}

#       - name: Get commit sha
#         id: merge_sha
#         uses: actions/github-script@v7
#         with:
#           github-token: ${{ secrets.GITHUB_TOKEN }}
#           result-encoding: string
#           script: |
#             const pr = await github.rest.pulls.get({
#               owner: context.repo.owner,
#               repo: context.repo.repo,
#               pull_number: context.issue.number
#             });
#             // FIXME: handle PRs that are merged with "Rebase and Merge" strategy
#             const sha = pr.data.merge_commit_sha;
#             if (!sha) {
#               throw new Error(`No merge_commit_sha found.`);
#             }
#             return sha;

#       - name: Cherry-pick commit
#         id: cherry
#         run: |
#           conflict=false
#           SHA="${{ steps.merge_sha.outputs.result }}"
#           echo "Cherry-picking squash-merge commit $SHA"
#           if git cherry-pick "$SHA"; then
#             echo "Cherry-picked $SHA"
#           else
#             echo "Conflict on $SHA"
#             conflict=true
#             echo "CONFLICT_SHA=$SHA" >> $GITHUB_ENV
#           fi
#           echo "CONFLICT=$conflict" >> $GITHUB_ENV

#       - name: Notify conflict
#         if: env.CONFLICT == 'true'
#         uses: actions/github-script@v7
#         with:
#           github-token: ${{ secrets.GITHUB_TOKEN }}
#           script: |
#             const sha = process.env.CONFLICT_SHA;
#             const target = process.env.TARGET;
#             await github.rest.issues.createComment({
#               owner: context.repo.owner,
#               repo: context.repo.repo,
#               issue_number: context.issue.number,
#               body: `Backport to \`${target}\` failed due to conflicts on commit \`${sha}\`. Please backport manually.`
#             });

#       - name: Stop on conflict
#         if: env.CONFLICT == 'true'
#         run: exit 0

#       - name: Push backport branch
#         if: env.CONFLICT == 'false'
#         run: git push --set-upstream origin HEAD

#       - name: Prepare PR
#         if: env.CONFLICT == 'false'
#         id: prinfo
#         run: |
#           echo "BODY<<EOF" >> $GITHUB_ENV
#           echo "Backport of PR #${{ github.event.issue.number }} into \`${{ env.TARGET }}\`." >> $GITHUB_ENV
#           echo "" >> $GITHUB_ENV
#           echo "All commits applied cleanly." >> $GITHUB_ENV
#           echo "EOF" >> $GITHUB_ENV
#           echo "LABELS=backport" >> $GITHUB_ENV

#       - name: Create Pull Request
#         if: env.CONFLICT == 'false'
#         id: create_pr
#         uses: actions/github-script@v7
#         with:
#           github-token: ${{ secrets.GITHUB_TOKEN }}
#           result-encoding: string
#           script: |
#             const {data: pr} = await github.rest.pulls.create({
#               owner: context.repo.owner,
#               repo: context.repo.repo,
#               head: `backport/pr-${context.issue.number}-to-${process.env.TARGET}`,
#               base: process.env.TARGET,
#               title: `[Backport to ${process.env.TARGET}] ${context.payload.issue.title}`,
#               body: process.env.BODY
#             });
#             return pr.html_url;

#       - name: Notify success
#         if: env.CONFLICT == 'false'
#         uses: actions/github-script@v7
#         env:
#           PR_URL: ${{ steps.create_pr.outputs.result }}
#         with:
#           script: |
#             const target = process.env.TARGET;
#             await github.rest.issues.createComment({
#               owner: context.repo.owner,
#               repo: context.repo.repo,
#               issue_number: context.issue.number,
#               body: `Success. Backport PR created: ${process.env.PR_URL}`
#             });

#       - name: Notify workflows
#         if: env.CONFLICT == 'false'
#         uses: peter-evans/repository-dispatch@v3
#         with:
#           token: ${{ secrets.GITHUB_TOKEN }}
#           event-type: backport-complete