action.yml

name: 'Git PR Release'
description: 'Create a release pull request from staging branch to production branch using git-pr-release'
author: 'buffett-code-dev'

inputs:
  github-token:
    description: 'GitHub token with pull request write permissions'
    required: true
  branch-production:
    description: 'Production branch name'
    required: true
  branch-staging:
    description: 'Staging branch name'
    required: true
  labels:
    description: 'Comma-separated labels to add to the release PR'
    required: false
    default: 'release'
  template:
    description: 'Path to the ERB template file for the release PR body'
    required: false

runs:
  using: 'composite'
  steps:
    - name: Check for diff between branches
      id: check-diff
      shell: bash
      run: |
        git fetch origin ${{ inputs.branch-production }} ${{ inputs.branch-staging }}
        DIFF_COUNT=$(git rev-list --count origin/${{ inputs.branch-production }}..origin/${{ inputs.branch-staging }})
        echo "diff_count=$DIFF_COUNT" >> "$GITHUB_OUTPUT"
        if [ "$DIFF_COUNT" -eq 0 ]; then
          echo "No diff between ${{ inputs.branch-production }} and ${{ inputs.branch-staging }}. Skipping."
        else
          echo "Found $DIFF_COUNT commit(s) to release."
        fi

    - name: Setup Ruby
      if: ${{ steps.check-diff.outputs.diff_count != '0' }}
      uses: ruby/setup-ruby@v1.321.0
      with:
        ruby-version: '3.4'

    - name: Install git-pr-release
      if: ${{ steps.check-diff.outputs.diff_count != '0' }}
      shell: bash
      run: gem install --no-document git-pr-release

    - name: Set template path
      if: ${{ inputs.template != '' }}
      shell: bash
      run: echo "GIT_PR_RELEASE_TEMPLATE=${TEMPLATE}" >> "$GITHUB_ENV"
      env:
        TEMPLATE: ${{ inputs.template }}

    - name: Create release PR
      if: ${{ steps.check-diff.outputs.diff_count != '0' }}
      shell: bash
      run: git-pr-release
      env:
        GIT_PR_RELEASE_TOKEN: ${{ inputs.github-token }}
        GIT_PR_RELEASE_BRANCH_PRODUCTION: ${{ inputs.branch-production }}
        GIT_PR_RELEASE_BRANCH_STAGING: ${{ inputs.branch-staging }}
        GIT_PR_RELEASE_LABELS: ${{ inputs.labels }}
        TZ: Asia/Tokyo