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How It Works

There are two approaches the plugin uses to identify the current branch:

1. Read from an external .what-git-branch file
2. Read data in the .git directory

First Approach: .what-git-branch File

The first approach looks for .what-git-branch (defined in Repository::EXTERNAL_FILE) file in the searchable paths, and if found, uses the file's contents as the current head reference.

If this file is not found, the second approach is used.

Second Approach: .git/HEAD file

The second and final approach reads the .git/HEAD file, and parses it for the checked out branch's name.

Searchable Paths

The plugin by default checks ABSPATH and WP_CONTENT_DIR directories for a .git directory, or a .what-git-branch file.

More paths can be added via the what-git-branch/get_dirs_from_scan()/$addtl_paths filter.

Remote Environments

To display the branch deployed to a remote environment (a.k.a. an environment without a git repository, or with a different git repository), write the branch name to the .what-git-branch file in one of the searchable path directories.

The following git command will return the currently checked out branch:

git rev-parse --abbrev-ref HEAD

GitHub Action

In a GitHub Action, this may look similar to this (depending on your deploy process and directory structure):

jobs:
  job-name:
    steps:
      - run: echo ${GITUHB_REF#refs/heads/} > .what-git-branch

Filters

what-git-branch/primary()/$dir

Set the directory for the primary repository. The primary repository will be highlighted in the Dashboard widget, and is displayed in the admin bar.

what-git-branch/get_dirs_from_filter()/$dirs

Hard-code the directories with repositories to improve performance by preventing filesystem scanning.

add_filter( 'what-git-branch/get_dirs_from_filter()/$dirs', static function ( array $dirs ) : array {
    $dirs = array(
        ABSPATH,
        WP_PLUGIN_DIR . '/what-git-branch',
    );
} );

what-git-branch/get_dirs_from_scan()/$addtl_paths

Additional paths outside of WP_CONTENT_DIR to scan for repositories.

what-git-branch/when_can_scan()

Identifying key for context to perform directory scan. Function \What_Git_Branch\Plugin::when_can_scan() will output one of the following:

never
http-request
manually
cli
heartbeat

what-git-branch/cache_store()

Change directories caching store between options and transients.

Expected values:

option
transient

what-git-branch/set_dirs_to_cache()/$expiration

Expiration of transient for directories cache.

what-git-branch/dashboard/foreach/continue

Skip printing repository(ies) in Dashboard widget.

what-git-branch/repository/name

Set name of repository; defaults to repository's directory's name.

what-git-branch/repository/get_head_ref()/commit

Filter the reference for HEAD for repository.

what-git-branch/repository/get_branch()/$branch

Change branch name for repository.

what-git-branch/repository/get_github_url()/$github_repo

Add link to repository on GitHub by setting user and repository name: user/repository.

add_filter( 'what-git-branch/get_github_url()/$github_repo', static function ( $github_repo, $path ) {
    if ( false === stripos( $path, 'what-git-branch' ) ) {
        return $github_repo;
    }

    return 'crstauf/what-git-branch';
}, 10, 2 );

CLI Commands

wp whatgitbranch list

List the repositories, directories, and head refs.

wp whatgitbranch directories scan

If permitted, scan the filesystem for repositories.

wp whatgitbranch directories clear-cache

Clear the directories cache.

wp whatgitbranch primary identify ref

Print the head ref of the primary repository.

wp whatgitbranch primary identify path

Print the path of the primary repository.

wp whatgitbranch primary set {$text}

Set head ref of primary repository to $text.

wp whatgitbranch primary reset

Reset head ref of primary repository (remove external file and use git data).