write XML line by line

[Angryboy]

Expanding on what shawn said (if almendro wants to write it as a plugin and publish it to extend):

PHP Code:

<?php
// plugins/prettify_pagecache.php
// Register the plugin
register_plugin(/*  registration details */);

// Add the page saving hook
add_action('pagecache-aftersave', 'prettify_pachecache');

// Define the prettifying function
function prettify_pachecache() {
  // get the xml file ($filem) and then run almendro's prettifying script
} 


I still think almendro's suggestion is worth making an issue/pull request on (e.g. having a constant in gsconfig.php that enables/disables xml prettifying).