User:Ostrzyciel/GSoC 2020

This is the page for documenting my internship at Wikimedia during Google Summer of Code 2020.

Project description
A valuable addition to the RecentChanges filtering interface would be a filter that would show edits that were "reverted" or "undone". The task is about adding such a filter. We will want to identify the edit that is being reverted and tag it with a "reverted" tag.

We'll need to detect when a revision is being rolled back / undone, and then apply a tag to the revision that it is rolling back. This involves defining a tag and implementing a hook which can apply that tag in certain conditions.

Bi-weekly reports

 * Week 2, May 20th
 * Week 4, June 3rd

The things I should probably do

 * ✅ Establish the definition of a "reverted" edit. Initial technical research.
 * Implement the reverted tag.
 * Create the EditResult class
 * Implement marking reverts based on undo and rollback actions
 * Write tests
 * Refactor hooks used in PageUpdater to use the new data
 * Implement SHA1-based revert detection
 * Implement the actual edit tag and mark reverted edits
 * Save additional information about the revert in the edit tag
 * Write a maintenance script for back-filling the reverted tag

The things that would be nice to do

 * Update the Echo extension to use the new functionality and remove redundant code.
 * Figure out what is going on with the new REST API and its reverted filter on history view.
 * The REST API when asked for reverted revisions of Cat returns for example this, not the previous edit, which is clearly wrong and inconsistent with what we're trying to do here. That would probably need to be fixed.