git-command.yml

name: "/git command"

on:
  repository_dispatch:
    types: [ git-command ]

concurrency:
  group: ${{ github.workflow }}-${{ github.event.client_payload.github.payload.issue.number }}-${{ github.event.client_payload.slash_command.command }}-${{ github.event.client_payload.slash_command.args.unnamed.arg1 || github.event.client_payload.slash_command.args.all }}

jobs:
  merge:
    if: ${{ github.event.client_payload.slash_command.args.unnamed.arg1 == 'merge' }}
    runs-on: ubuntu-latest
    timeout-minutes: 3
    steps:
      - name: Checkout on chat command
        uses: actions/checkout@v3
        with:
          token: ${{ secrets.GIT_PAT }}
          repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
          ref: ${{ github.event.client_payload.pull_request.head.ref }}
          fetch-depth: 0

      - name: Check for merge conflict
        id: check-conflict
        env:
          SLASH_COMMAND_ARG_BRANCH: ${{ github.event.client_payload.slash_command.args.unnamed.arg2 }}
        shell: bash
        run: |
          set -xeuo pipefail
          git config --global user.name '${{ github.event.client_payload.github.actor }}'
          git config --global user.email '${{ github.event.client_payload.github.actor }}@users.noreply.github.com'
          echo "merge_conflict=$(git merge-tree $(git merge-base HEAD origin/$SLASH_COMMAND_ARG_BRANCH) origin/$SLASH_COMMAND_ARG_BRANCH HEAD | egrep '<<<<<<<')" >> $GITHUB_OUTPUT

      - name: Add reaction to command comment on merge conflict
        uses: peter-evans/create-or-update-comment@v3
        if: ${{ steps.check-conflict.outputs.merge_conflict }}
        with:
          token: ${{ secrets.GIT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          body: |
            > **Error**: Merge conflict detected, please resolve it using the command line.
            >
            > [Workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
          reactions: "-1"

      - name: Merge branch into current branch
        env:
          SLASH_COMMAND_ARG_BRANCH: ${{ github.event.client_payload.slash_command.args.unnamed.arg2 }}
        if: ${{ !steps.check-conflict.outputs.merge_conflict }}
        id: commit_and_push
        shell: bash
        run: |
          set -xeuo pipefail
          git merge origin/$SLASH_COMMAND_ARG_BRANCH
          if [ $(git cherry -v | wc -l) -ge 1 ]; then
            echo "changes=yes" >> $GITHUB_OUTPUT
            echo "last_commit_sha=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
            echo "last_commit_msg=$(git log -1 --pretty='%s')" >> $GITHUB_OUTPUT
          else
            echo "changes=no" >> $GITHUB_OUTPUT
            exit 0
          fi
          git push origin HEAD

      - name: Add reaction to command comment on nothing to do
        if: ${{ !steps.check-conflict.outputs.merge_conflict && steps.commit_and_push.outputs.changes == 'no' }}
        uses: peter-evans/create-or-update-comment@v3
        with:
          token: ${{ secrets.GIT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          body: |
            > Already up-to-date. Nothing to commit.
            >
            > [Workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
          reactions: "confused"

      - name: Add reaction to command comment on success
        if: ${{ !steps.check-conflict.outputs.merge_conflict && steps.commit_and_push.outputs.changes == 'yes' }}
        uses: peter-evans/create-or-update-comment@v3
        with:
          token: ${{ secrets.GIT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          body: |
            > Successfully pushed new changes:
            > ${{ steps.commit_and_push.outputs.last_commit_msg }} (${{ steps.commit_and_push.outputs.last_commit_sha }})
            >
            > [Workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
          reactions: "+1"

      - name: Add reaction to command comment on failure
        uses: peter-evans/create-or-update-comment@v3
        if: failure()
        with:
          token: ${{ secrets.GIT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          body: |
            > **Error**: failed to execute "${{ github.event.client_payload.slash_command.args.unnamed.arg1 }}" command
            >
            > [Workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
          reactions: "-1"

  help:
    if: ${{ github.event.client_payload.slash_command.args.unnamed.arg1 == 'help' || !contains(fromJson('["merge", "arg2"]'), github.event.client_payload.slash_command.args.unnamed.arg1) }}
    runs-on: ubuntu-latest
    timeout-minutes: 1
    steps:
      - name: Update comment
        uses: peter-evans/create-or-update-comment@v3
        with:
          token: ${{ secrets.GIT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          body: |
            > Command | Description
            > --- | ---
            > /git merge `branch` | Merge branch `branch` into current branch
          reaction-type: hooray