branch-names/action.yml

name: Branch Names
description: Retrieve github branch or tag information without the /ref/* prefix
author: tj-actions
inputs:
  strip_tag_prefix:
    description: 'The prefix that should be stripped from the tag e.g `v` -> with a tag `v0.0.1` -> returns `0.0.1`'
    default: ''
    required: false

outputs:
  is_default:
    value: ${{ steps.default.outputs.is_default }}
    description: 'Returns `"true"` if the current branch is the default else `"false"`.'
  is_tag:
    value: ${{ steps.tag.outputs.is_tag }}
    description: 'Returns `"true"` if the current branch is a tag else `"false"`.'
  default_branch:
    value: ${{ steps.default.outputs.default_branch }}
    description: 'The default branch name e.g `main` OR `master`'
  current_branch:
    value: ${{ steps.current_branch.outputs.current_branch }}
    description: 'The current branch name regardless of event_type e.g `main`, `feature/test`'
  base_ref_branch:
    value: ${{ steps.branch.outputs.base_ref_branch }}
    description: 'The target branch of a pull request or tag e.g `main`'
  head_ref_branch:
    value: ${{ steps.branch.outputs.head_ref_branch }}
    description: 'The source branch of a pull request e.g `feature/test`'
  ref_branch:
    value: ${{ steps.branch.outputs.ref_branch }}
    description: 'The branch that triggered the workflow run. e.g `1/merge`, `main`'
  tag:
    value: ${{ steps.tag.outputs.tag }}
    description: 'The tag that triggered the workflow run. e.g `v0.0.1`, `0.0.1`'

runs:
  using: "composite"
  steps:
    - id: branch
      env:
        GITHUB_REF: ${{ github.ref }}
        GITHUB_BASE_REF: ${{ github.event.pull_request.base.ref || github.base_ref }}
        GITHUB_HEAD_REF: ${{ github.event.pull_request.head.ref || github.head_ref }}
        GITHUB_EVENT_BASE_REF: ${{ github.event.base_ref }}
        INPUTS_STRIP_TAG_PREFIX: ${{ inputs.strip_tag_prefix }}
      run: |
        # "Set branch names..."
        if [[ "$GITHUB_REF" != "refs/tags/"* ]]; then
          BASE_REF=$(printf "%q" "$GITHUB_BASE_REF")
          HEAD_REF=$(printf "%q" "$GITHUB_HEAD_REF")
          REF=$(printf "%q" "$GITHUB_REF")

          BASE_REF=${BASE_REF/refs\/heads\//}
          HEAD_REF=${HEAD_REF/refs\/heads\//}
          REF_BRANCH=${REF/refs\/pull\//}
          REF_BRANCH=${REF_BRANCH/refs\/heads\//}
          
          echo "base_ref_branch=$(eval printf "%s" "$BASE_REF")" >> "$GITHUB_OUTPUT"
          echo "head_ref_branch=$(eval printf "%s" "$HEAD_REF")" >> "$GITHUB_OUTPUT"
          echo "ref_branch=$(eval printf "%s" "$REF_BRANCH")" >> "$GITHUB_OUTPUT"
        else
          BASE_REF=$(printf "%q" "$GITHUB_EVENT_BASE_REF")
          BASE_REF=${BASE_REF/refs\/heads\/$INPUTS_STRIP_TAG_PREFIX/}
          
          echo "base_ref_branch=$(eval printf "%s" "$BASE_REF")" >> "$GITHUB_OUTPUT"
        fi
      shell: bash
    - id: current_branch
      env:
        GITHUB_REF: ${{ github.ref }}
        GITHUB_EVENT_NAME: ${{ github.event_name }}
        HEAD_REF_BRANCH: ${{ steps.branch.outputs.head_ref_branch }}
        REF_BRANCH: ${{ steps.branch.outputs.ref_branch }}
      run: |
        # "Set the current branch name..."
        if [[ "$GITHUB_REF" != "refs/tags/"* ]]; then
          if [[ "$GITHUB_EVENT_NAME" == *"pull_request"* ]]; then
            echo "current_branch=$HEAD_REF_BRANCH" >> "$GITHUB_OUTPUT"
          else
            echo "current_branch=$REF_BRANCH" >> "$GITHUB_OUTPUT"
          fi
        fi
      shell: bash
    - id: default
      env:
        GITHUB_REF: ${{ github.ref }}
        CURRENT_BRANCH: ${{ steps.current_branch.outputs.current_branch }}
        DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
        FORK: ${{ github.event.pull_request.head.repo.fork }}
      run: |
        # "Set the default branch name..."
        if [[ "$GITHUB_REF" != "refs/tags/"* ]]; then
          if [[ "$CURRENT_BRANCH" == "$DEFAULT_BRANCH" && "$FORK" != "true" ]]; then
            echo "is_default=true" >> "$GITHUB_OUTPUT"
            echo "default_branch=$DEFAULT_BRANCH" >> "$GITHUB_OUTPUT"
          else
            echo "is_default=false" >> "$GITHUB_OUTPUT"
            echo "default_branch=$DEFAULT_BRANCH" >> "$GITHUB_OUTPUT"
          fi
        fi
      shell: bash
    - id: tag
      env:
        GITHUB_REF: ${{ github.ref }}
        INPUTS_STRIP_TAG_PREFIX: ${{ inputs.strip_tag_prefix }}
      run: |
        # "Set the tag name..."
        if [[ "$GITHUB_REF" == "refs/tags/"* ]]; then
          REF=$(printf "%q" "$GITHUB_REF")
          TAG="${REF/refs\/tags\/$INPUTS_STRIP_TAG_PREFIX/}"

          echo "tag=$(eval printf "%s" "$TAG")" >> "$GITHUB_OUTPUT"
          echo "is_tag=true" >> "$GITHUB_OUTPUT"
        else
          echo "is_tag=false" >> "$GITHUB_OUTPUT"
        fi
      shell: bash

branding:
  icon: git-branch
  color: white