name: branch-names
description: Retrieve giithub branch information without `/ref/*` prefix
author: tj-actions
inputs:
  base_ref:
    description: 'The target branch of a pull request'
    default: ${{ github.base_ref }}
    required: false
  head_ref:
    description: 'The source branch of a pull request'
    default: ${{ github.head_ref }}
    required: false
  ref:
    description: 'The branch that triggered the workflow run.'
    default: ${{ github.ref }}
    required: false

outputs:
  is_default:
    value: ${{ steps.default.outputs.is_default }}
    description: 'Returns "true" if the current branch is the default else "false".'
  current_branch:
    value: ${{ steps.current_branch.outputs.current_branch }}
    description: 'Returns the value of the current branch which is consistent regardless of event_type: i.e (push, pull_requests).'
  base_ref_branch:
    value: ${{ steps.branch.outputs.base_ref_branch }}
    description: 'The target branch of a pull request'
  head_ref_branch:
    value: ${{ steps.branch.outputs.head_ref_branch }}
    description: 'The source branch of a pull request'
  ref_branch:
    value: ${{ steps.branch.outputs.ref_branch }}
    description: 'The branch that triggered the workflow run.'
  tag:
    value: ${{ steps.tag.outputs.tag }}
    description: 'The tag that triggered the workflow run.'

runs:
  using: "composite"
  steps:
    - id: branch
      run: |
        if [[ !${{ startsWith(inputs.ref, 'refs/tags/') }} ]]; then
          export BASE_REF=${{ inputs.base_ref }}
          export HEAD_REF=${{ inputs.head_ref }}
          export REF=${{ inputs.ref }}
          echo "::set-output name=base_ref_branch::${BASE_REF/refs\/heads\//}"
          echo "::set-output name=head_ref_branch::${HEAD_REF/refs\/heads\//}"
          REF_BRANCH=${REF/refs\/pull\//}
          echo "::set-output name=ref_branch::${REF_BRANCH/refs\/heads\//}"
        fi
      shell: bash
    - id: current_branch
      run: |
        if [[ ${{ github.event_name }} == 'pull_request' ]]; then
          echo "::set-output name=current_branch::${{ steps.branch.outputs.head_ref_branch }}"
        else
          echo "::set-output name=current_branch::${{ steps.branch.outputs.ref_branch }}"
        fi
      shell: bash
    - id: default
      run: |
        if [[ "${{ steps.current_branch.outputs.current_branch }}" == "${{ steps.branch.outputs.ref_branch }}" ]]; then
          echo "::set-output name=is_default::true"
        else
          echo "::set-output name=is_default::false"
        fi
      shell: bash
    - id: tag
      run: |
        if [[ ${{ startsWith(inputs.ref, 'refs/tags/') }} ]]; then
          export REF=${{ inputs.ref }}
          TAG=${REF/refs\/tags\//}
          echo "::set-output name=tag::$TAG"
        fi
      shell: bash

branding:
  icon: git-branch
  color: white