How to become a MediaWiki hacker/ru

Эта статья поможет разработчикам обрести базовые навыки, необходимые для того, чтобы можно было делать вклад в развитие MediaWiki.

Если вы уже опытный разработчик и хорошо знакомы с особенностями MediaWiki, посетите .

Обзор
МедиаВики - это программное обеспечение, на основе которой создана Википедия, её родственные проекты, а также тысячи вики по всему миру. Оно поддерживается большинством операционных систем, написано на PHP, использует в основном серверные базы данных MySQL и MariaDB, а также jQuery —клиентскую библиотеку для JavaScript. Разработка МедиаВики поддерживается главным образом организацией Wikimedia Foundation, сообщество добровольцев тоже играет огромную роль в развитии проекта.

Данная статья поможет вам внести собственный вклад в МедиаВики. Это не учебник. Здесь лишь указаны источники, из которых вы можете почерпнуть необходимые сведения.

С чего начать
Зарегистрируйтесь  и прочтите Gerrit tutorial. Затем загрузите исходный код, вносите изменения, тестируйте, предлагайте исправления. Для разработки используйте уже настроенную виртуальную машину (vagrant) или установите всё необходимое сами.

Виртуальная машина с Vagrant


 * Установка Vagrant — Установка сервера МедиаВики со всем необходимым внутри виртуальной машины в Linux (возможно использование Linux, Windows или Mac хостов)

Самостоятельная установка

 * Необходимое ПО — Проверьте аппаратные требования, установите LAMP, MAMP или WAMP (соответственно для Linux, Mac или Windows, а также Apache, MySQL/MariaDB и PHP).
 * — Загрузите исходный код с помощью git.
 * — Установите и проведите первоначальную настройку
 * Настройте режимы отладки для раннего отображения предупреждений и ошибок.

Нет необходимости в загрузке дампов базы данных Википедии для разработки МедиаВики. Зачастую проще использовать крошечную базу данных со специальными заготовками тестовых страниц. Если же вы хотите использовать копию Википедии, используйте дамп.

Рекомендовано для прочтения


Общие рекомендации
Для работы с отчетами об ошибках (bug report) и последующего внесения изменений, будет полезно сперва ознакомится с данными материалами:

 
 * Для начала можно исправлять мелкие ошибки или добавлять новые возможности в МедиаВики.
 * Стандарты оформления кода и другие подобные материалы (,, , …)
 * Following the Commit message guidelines, especially the Example section at the bottom, will automatically add a notification about your patch to the corresponding report in . Hence there is no need anymore to add a "Please review" comment in the report.
 * Check your code against the pre-commit checklist. Don't skip this step ; you'll be happy you didn't.
 * Getting code reviews. Find and add people as potential reviewers of your patch.
 * Amending a change. Don't create a new Gerrit changeset to fix your previous one!
 * In most cases when working with MediaWiki, you do not want to hack MediaWiki core unless you really know what you're doing.

Feedback, questions and support
 
 * You are expected to do some basic research yourself first: Look at the code, try to get some understanding what it is supposed to do, read related documentation, try to find the probable place(s) where you need to make changes in order to fix the bug.
 * If you have general questions about infrastructure, the software architecture or workflows which are not tied to the specific bug that you want to work on, use generic channels like, mailing lists, or wiki discussion pages. For example, if you have a problem with Gerrit, the Gerrit discussion page could be a good place to ask.
 * If you have a specific question about the bug itself, comment in the corresponding report. "What do I have to do to fix this bug?" is not a good question to start with: The more specific your questions are, the more likely somebody can answer them quickly. If you have no idea at all how to fix the bug, maybe that bug is not (yet) for you - please consider finding an easier one first.
 * When asking, elaborate what you have tried and found out already, so others can help at the right level. Try to be specific - for example, copy and paste your commands and their output (if not too long) instead of paraphrasing in your own words. This avoids misunderstandings.
 * Avoid private email or support requests in our social media channels.
 * Please be patient when seeking input and comments. On IRC, don't ask to ask, just ask: most questions can be answered by other community members too if you ask on an IRC channel. If nobody answers, please ask on the bug report or wiki page related to the problem; don't just drop the question.
 * Learn more at.

Communicate that you work on a bug
You do not need to be set as the assignee in a bug report or announce your plans before you start working on a bug, but it would be welcome. At the latest when you are close to creating a patch for the bug, it is good to announce in a comment that you are working on it. Your announcement also helps others to not work on the bug at the same time and duplicate work.

Also note that if a bug report already has a recent link to a patch in Gerrit and has the project "Patch-For-Review" associated, you should choose a different bug to work on instead - avoid duplicating work. If the patch in Gerrit has not been merged and has not seen any changes for a long time, you could also pick up that existing patch and try to improve it.

If you stop working on a task you should remove yourself as the assignee of a bug report and reset the assignee to the default assignee, so others know that they can work on the bug report and don't expect you to still work on it.

By communicating early you will get more attention, feedback and help from community members. 

Working on extensions
If you choose to work on MediaWiki extensions code, the following links provide more information.


 * MediaWiki extensions primers:
 * Developing extensions — How to write an extension for MediaWiki.
 * Writing an extension for deployment — If you intend to have your extension deployed on Wikimedia sites (including possibly Wikipedia), additional scrutiny is warranted in terms of performance and security.
 * Extension writing tutorial


 * MediaWiki extensions resources:
 * List of simple extensions — A simple way to become more familiar with how extensions work.
 * A brief introduction to MediaWiki extension development — A video presentation about how to create a MediaWiki extension (slides).
 * Making a MediaWiki extension — Covers how to develop an extension for Mediawiki, best practices, and how to engage the Mediawiki community. From February 2011.
 * Special page template — Add a special page to display some handy information.
 * Extending wiki markup — Add a parser hook to modify the content of wikitext.

PHP
MediaWiki is written in PHP, so you'll need to get familiar with PHP to hack MediaWiki's core.


 * Learn PHP
 * PHP tutorial — Available in many different languages. If you have no knowledge of PHP but know how to program in other object-oriented programming languages, PHP will be easy for you to learn.
 * PHP Programming at Wikibooks.
 * PHP topic at Wikiversity.


 * PHP resources:
 * The PHP manual — Available in many different languages.
 * PHP coding conventions within the MediaWiki community.


 * Stuff to know:
 * The script  in MediaWiki provides a basic PHP interpreter with MediaWiki objects and classes loaded.

Database
Many features require some amount of database manipulation, so you'll often need to be familiar with MySQL/MariaDB.


 * Learn MySQL/MariaDB
 * MySQL tutorial — From the MySQL 5.0 reference manual.
 * MySQL at Wikibooks.


 * MySQL/MariaDB resources
 * MySQL Reference Manuals — Available in many different languages.
 * MariaDB Knowledge Base
 * Database coding conventions within the MediaWiki community.


 * Stuff to know:
 * Test your code with MySQL/MariaDB.
 * MediaWiki currently uses MySQL and MariaDB as the primary database back-end. It also supports other DBMSes, such as PostgreSQL and SQLite. However, almost all developers use MySQL/MariaDB and don't test other DBs, which consequently break on a regular basis. You're therefore advised to use MySQL/MariaDB when testing patches, unless you're specifically trying to improve support for another DB. In the latter case, make sure you're careful not to break MySQL/MariaDB (or write queries that are horribly inefficient in it), since MySQL/MariaDB is what everybody else uses.

JavaScript and CSS
JavaScript and CSS have become omnipresent in front-end code. You don't have to be familiar with JavaScript, jQuery and CSS to work on MediaWiki, but you might need to, depending on what you choose to work on.


 * Learn JavaScript and CSS
 * JavaScript and CSS at Wikibooks.
 * Getting Started with jQuery — A jQuery tutorial.


 * JavaScript and CSS resources
 * JavaScript coding conventions within the MediaWiki community.
 * CSS coding conventions within the MediaWiki community.

MediaWiki
The MediaWiki code base is large and some parts are ugly; don't be overwhelmed by it. When you're first starting off, aim to write features or fix bugs which are constrained to a small region of code.


 * MediaWiki primers and must-reads:
 * MediaWiki architecture — A high-level overview of the main components of MediaWiki and how they work with each other.
 *  — An overview of why and how to write secure code.


 * MediaWiki resources:
 * — A list of important files and links to more detailed information.
 * — A list of hooks. If you're trying to find what part of the codebase does something, often a good place to start is by searching for the related hooks.
 * — An overview of general coding conventions within the MediaWiki community.
 * — Ways to hack MediaWiki, from user preferences to extensions and core.
 * Code documentation — Automatically generated documentation from the code and code comments.
 * — A guide to debugging MediaWiki.
 * — A tool to interact with MediaWiki objects live.