import.yml

name: import upstream

on:
  schedule:
    - cron: "0 0 * * 0"
  workflow_dispatch:

permissions: write-all

jobs:
  import:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
      - id: tools
        run: |
          # Clone the repository to a temporary directory.
          tools=$(mktemp -d)/tools
          git clone --depth 1 "https://github.com/golang/tools" "$tools"
          echo "tools=$tools" >> $GITHUB_ENV

          # Copy the diff package to the current directory.
          cp -r "$tools/internal/diff/"* .

          # Replace the import path.
          find . -type f -name '*.go' -exec sed -i'' 's|golang.org/x/tools/internal/diff/|github.com/aymanbagabas/go-udiff/|g' {} +
          find . -type f -name '*.go' -exec sed -i'' 's|"golang.org/x/tools/internal/diff|diff "github.com/aymanbagabas/go-udiff|g' {} +

          # Change package name to udiff.
          sed -i'' 's|package diff|package udiff|g' *.go

          # Apply patches
          for p in _patches/*; do
            git apply $p
          done

          # Set output variables.
          echo "base=$(cat .github/UPSTREAM | head -n1)" >> $GITHUB_OUTPUT
          cd "$tools"
          commit=$(git rev-parse HEAD)
          echo "commit=$commit" >> $GITHUB_OUTPUT
          cd -

          # Update the upstream commit.
          if ! git update-index --refresh || ! git diff-index --quiet HEAD --; then
            echo "$commit" > .github/UPSTREAM
          fi
      - name: Create Pull Request
        id: cpr
        uses: peter-evans/create-pull-request@v5
        with:
          commit-message: "feat: import upstream package"
          title: "Import upstream package [create-pull-request]"
          body: |
            Import upstream changes from [tree](https://github.com/golang/tools/tree/${{ steps.tools.outputs.commit }}/internal/diff).

            Take a look at the [diff](https://github.com/golang/tools/commits/master/internal/diff) to see what changed.
          branch: "import-upstream"
          delete-branch: true
      - name: Check outputs
        if: ${{ steps.cpr.outputs.pull-request-number }}
        run: |
          echo "Pull Request Number - ${{ steps.cpr.outputs.pull-request-number }}"
          echo "Pull Request URL - ${{ steps.cpr.outputs.pull-request-url }}"

# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json