edit-post-link_init.php

<?php
function EditPostLink_init($file) {

	require_once('EditPostLink_Plugin.php');
	$aPlugin = new EditPostLink_Plugin();

	// Install the plugin
	// NOTE: this file gets run each time you *activate* the plugin.
	// So in WP when you "install" the plugin, all that does it dump its files in the plugin-templates directory
	// but it does not call any of its code.
	// So here, the plugin tracks whether or not it has run its install operation, and we ensure it is run only once
	// on the first activation
	if (!$aPlugin->isInstalled()) {
		$aPlugin->install();
	}
	else {
		// Perform any version-upgrade activities prior to activation (e.g. database changes)
		$aPlugin->upgrade();
	}

	// Add callbacks to hooks
	$aPlugin->addActionsAndFilters();

	if (!$file) {
		$file = __FILE__;
	}
	// Register the Plugin Activation Hook
	register_activation_hook($file, array(&$aPlugin, 'activate'));

	// Register the Plugin Deactivation Hook
	register_deactivation_hook($file, array(&$aPlugin, 'deactivate'));
}