Building a plugin into a theme

Question

Firstly, I know this is 'bad' practice for several different reasons, but for reasons that I won't waste your time with it's something I need to do.

Using a fairly simple plugin and I've tried copying it into functions.php and updating the file paths and dependences, but I'm having some trouble.

Plugin file looks like this:-

$plugin_headers = get_file_data( __FILE__, array( 'Version' => 'Version', 'Name' => 'Plugin Name' ) );


/**
 * We store our plugin data in the following global array.
 * $my_unique_name with your unique name
 */
global $my_unique_name;
$my_unique_name = array();
$my_unique_name['version_key'] = strtolower( str_replace( ' ', '_', $plugin_headers['Name'] ) ) . '_version';
$my_unique_name['version_value'] = $plugin_headers['Version'];


/**
 * When the user activates the plugin we add the version number to the
 * options table as "my_plugin_name_version" only if this is a newer version.
 */
function inline_comments_acitvation(){

    global $my_unique_name;

    if ( get_option( $my_unique_name['version_key'] ) && get_option( $my_unique_name['version_key'] ) > $my_unique_name['version_value'] )
        return;

    update_option( $my_unique_name['version_key'], $my_unique_name['version_value'] );

}
register_activation_hook( __FILE__, 'inline_comments_acitvation' );


/**
 * Delete our version number from the database when the plugin is activated.
 */
function inline_comments_deactivate(){
    global $my_unique_name;
    delete_option( $my_unique_name['version_key'] );
}
register_deactivation_hook( __FILE__, 'inline_comments_deactivate' );


if ( is_admin() )
    require_once plugin_dir_path( __FILE__ ) . 'admin/admin-tags.php';

/**
 * Theme only functions
 */
require_once plugin_dir_path( __FILE__ ) . 'inc/template-tags.php';


function inline_comments_enqueue_scripts(){

    $plugin_headers = get_file_data( __FILE__, array( 'Version' => 'Version', 'Name' => 'Original Plugin Name' ) );
    $clean_name = strtolower( str_replace( ' ', '-', $plugin_headers['Name'] ) );

    wp_register_style( $clean_name . '-style', plugin_dir_url( __FILE__ ) . 'inc/css/style.css' );
    wp_register_script( 'textarea_auto_expand-script', plugin_dir_url( __FILE__ ) . 'vendor/textarea-auto-expand/jquery.textarea_auto_expand.js' );
    wp_register_script( $clean_name . '-script', plugin_dir_url( __FILE__ ) . 'inc/js/script.js', array('jquery', 'textarea_auto_expand-script') );
}

add_action('wp_enqueue_scripts', 'inline_comments_enqueue_scripts', 2);

After moving the plugin to the theme folder I've done the following: I've removed the pointless parts and in my functions.php I'm loading the main script.js (it loads) and the css, like so.

function inline_comments_enqueue_scripts(){
if ( is_singular() || is_page() ) {

    wp_enqueue_style( 'inline-style', get_template_directory_uri() . '/css/inline-style.css', '10000', 'all' );

    wp_enqueue_script( 'inline-script', get_template_directory_uri() . '/js/inline-script.js', array( 'jquery' ), MEDIUM_VERSION);
}   

}

add_action('wp_enqueue_scripts', 'inline_comments_enqueue_scripts', 2);

Ok, so our script loads with our css.

The problem is the main part of the plugin that contains the templates, the functions and the ajax calls I can't get to load.

This part:- require_once plugin_dir_path( __FILE__ ) . 'inc/template-tags.php';

I've tried pasting this file into functions.php and nothing happens, it just doesn't work.

Probably making a really stupid mistake somewhere(other than building a plugin into a theme, heh).

Answer 1

Just because you think that you have to do it doesn't remove the fact that it is very not smart to do it. The plugin code is built to be used as a plugin and not as a theme, and while you can copy parts of the code and use them in the theme there can not be any simple way to make sure there is no dependency left somewhere in the code.

The easiest way to do this kind of things is to check that a plugin is active and force its activation if it isn't (and you can't trust your client not to deactivate it).

Answer 2

I'm making some brief assumption based on the way you have typed your question..

"After moving the plugin to the theme folder"

Meaning you have taken the plugin from the plugin directory to your wp-content/themes/THEME_FOLDER. If this is the case then calling plugin_dir_path( __FILE__ ) will be unsuccessful in finding your file.

You would need to use get_template_directory_uri() or something else.

Please review the Codex to better understand the function.

If I am incorrect in my assumptions please let me know as I may be able to correctly address the issue with more information.