plugin-from-trace.php

<?php
function get_plugin_from_trace( $trace ) {
	$file = null;

	while ( $elem = array_shift( $trace ) ) {
		if ( empty( $elem['file'] ) ) {
			// We catch this later
			continue;
		}

		// Is this from a Courier file?
		if ( strpos( $elem['file'], COURIER_BASE ) === 0 ) {
			continue;
		}

		$file = $elem['file'];
		break;
	}

	if ( empty( $file ) ) {
		throw new Exception( 'Plugin file could not be detected via trace' );
	}

	$available_plugins = get_plugins();
	$plugins_dir = trailingslashit( WP_PLUGIN_DIR );
	if ( strpos( $file, $plugins_dir ) === 0 ) {
		$file = substr( $file, strlen( $plugins_dir ) );
	}

	if ( empty( $available_plugins[ $file ] ) ) {
		throw new Exception( 'Invalid plugin file found via trace' );
	}

	if ( strpos( $file, '/' ) === false ) {
		throw new Exception( 'Only plugins in directories can require files' );
	}

	// Hackity hackity hack
	add_action( 'activate_' . $file, 'Courier\\Internal\\check_resolution', COURIER_RESOLUTION_PRIORITY );

	$id = basename( dirname( $file ) );

	return array( $id, $available_plugins[ $file ] );
}