name: Update maintainers, manpage and completions

on:
  push:
    paths:
      - .github/workflows/update-man-completions.yml
      - README.md
      - Library/Homebrew/cmd/**
      - Library/Homebrew/dev-cmd/**
      - Library/Homebrew/completions/**
      - Library/Homebrew/manpages/**
      - Library/Homebrew/cli/parser.rb
      - Library/Homebrew/completions.rb
      - Library/Homebrew/env_config.rb
    branches:
      - master
  schedule:
    - cron: "0 0 * * *"
  workflow_dispatch:

jobs:
  update-manpage:
    runs-on: ubuntu-latest
    if: github.repository == 'Homebrew/brew'
    steps:
      - name: Setup Homebrew
        uses: Homebrew/actions/setup-homebrew@master

      - name: Configure Git user
        uses: Homebrew/actions/git-user-config@master
        with:
          username: BrewTestBot

      - name: Set up commit signing
        uses: Homebrew/actions/setup-commit-signing@master
        with:
          signing_key: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY }}

      - name: Update maintainers, manpage and completions
        id: update
        run: |
          git fetch origin

          BRANCH=update-man-completions
          echo "::set-output name=branch::${BRANCH}"

          if git ls-remote --exit-code --heads origin "${BRANCH}"
          then
            git checkout "${BRANCH}"
            git reset --hard origin/master
          else
            git checkout --no-track -B "${BRANCH}" origin/master
          fi

          if [[ "${{github.event_name}}" != "push" ]]
          then
            brew update-maintainers
          fi

          if brew generate-man-completions --fail-if-not-changed
          then
            git add "${GITHUB_WORKSPACE}/README.md" \
                    "${GITHUB_WORKSPACE}/docs/Manpage.md" \
                    "${GITHUB_WORKSPACE}/manpages/brew.1" \
                    "${GITHUB_WORKSPACE}/completions"
            git commit -m "Update maintainers, manpage and completions." \
                       -m "Autogenerated by the [update-man-completions](https://github.com/Homebrew/brew/blob/HEAD/.github/workflows/update-man-completions.yml) workflow."
            echo "::set-output name=committed::true"
            PULL_REQUEST_STATE="$(gh pr view --json=state | jq -r ".state")"
            if [[ "${PULL_REQUEST_STATE}" != "OPEN" ]]
            then
              echo "::set-output name=pull_request::true"
            fi
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
          HOMEBREW_GITHUB_API_TOKEN: ${{ secrets.HOMEBREW_BREW_UPDATE_MAINTAINERS_TOKEN }}
          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}

      - name: Push commits
        if: steps.update.outputs.committed == 'true'
        uses: Homebrew/actions/git-try-push@master
        with:
          token: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
          branch: ${{ steps.update.outputs.branch }}
          force: true
          origin_branch: "master"

      - name: Open a pull request
        if: steps.update.outputs.pull_request == 'true'
        run: hub pull-request --no-edit
        env:
          GITHUB_TOKEN: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}