How do I add Bootstrap and LESS to my migrated WordPress site?

You don’t need to create additional functions, just re-use what you already have and tweak it a bit:

function theme_add_bootstrap() {
  wp_enqueue_style( 'bootstrap-css', get_template_directory_uri() . '/third_party/bootstrap/css/bootstrap.min.css' );
  wp_enqueue_script( 'bootstrap-js', get_template_directory_uri() . '/third_party/bootstrap/js/bootstrap.min.js', array(), '3.0.0', true );
  if (WP_ENV === 'development') {
    wp_enqueue_script( 'lesscss', get_stylesheet_directory_uri() . '/third_party/less-1.5.0.min.js' );
    wp_enqueue_style( 'style-less', get_template_directory_uri() . '/css/custom.less' );    
  } else {
    wp_enqueue_style( 'style-css', get_template_directory_uri() . '/css/custom.css' );
  }
}

Once you have that setup then just head to your wp-config.php on your development machine and add a line:

define('WP_ENV', 'development');

Assuming you don’t have that line in your production wp-config.php then it should use CSS instead of LESS.

I adapted this method from the Roots theme which uses the same method for something similar.

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