Manual:Extensions/pt-br

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O que são extensões?
Extensões permitem a você personalizar a aparência e o funcionamento do MediaWiki.

Usuários de wiki podem navegar pelas extensões existentes ou pedir uma nova extensão. Administradores do sistema podem instalar (ou remover) extensões nas instalações do MediaWiki que eles manuseiam. Desenvolvedores podem escrever novas extensões ou melhorar ou manter extensões existentes.

Pesquise extensões por palavras-chave:
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Dependendo do seu objetivo, você pode usar as extensões para:


 * extender a marcação wiki usada para escrever artigos - veja Category:Parser function extensions e Category:Parser extensions para exemplos.
 * adicionar novos relatórios e capacidades administrativas - veja Category:Special page extensions para exemplos.
 * mudar o visual do MediaWiki - veja Gallery of user style e Category:User interface extensions para exemplos.
 * aumentar a segurança através de mecanismos de autentificação customizados - veja Category:User access extensions para exemplos.

Enquanto algumas extensões são mantidas por desenvolvedores do MediaWiki, outras são escritas por desenvolvedores de terceiros. Como resultado, várias extensões possuem bugs, e elas não são totalmente garantidas de serem compatíveis umas com as outras. Algumas não são mantidas; nem todas as extensões funcionam em todas as versões do MediaWiki. Use qualquer extensão, especialmente aquelas marcadas como inseguras, a seu próprio risco. Quando for usar uma extensão que exiga patches para o núcleo de código do MediaWiki ou entradas em sua(s) base(s) de dados, certifique-se de criar um back-up da sua base de dados e/ou do núcleo do código do MediaWiki, para evitar risco de quebrar permanentemente a sua wiki.

Procurar extensões
Você pode procurar em Category:Extensions by category e Extension Matrix para ver todas as variedades de extensões que já foram escritas. may also be helpful to pick out extensions. Para informações de como instalar estas extensões ou sobre escrever a sua própria, veja abaixo.

Checando extensões instaladas
Apenas alguém com acesso administrativo ao sistema de arquivos (e talvez à base de dados também) em um servidor pode instalar uma extensão para o MediaWiki, mas qualquer um pode checar quais extensões estão ativas em uma instância do MediaWiki, acessando a página Special:Version. Por exemplo, estas extensões estão ativas na Wikipédia em inglês.

Instalando uma extensão
O MediaWiki está pronto para aceitar extensões logo após a instalação estar completa. To add an extension follow these steps:


 * 1) Before you start
 * Many extensions provide instructions designed for installation using unix commands. You require shell access (SSH) to enter these commands listed on the extension help pages.
 * 1) Download your extension.
 * Extension Distributor helps you to select and download most of the popular extensions.
 * Extensions are usually distributed as modular packages. They generally go in their own subdirectory of .  A list of extensions stored in the Wikimedia Git repository is located at git:mediawiki/extensions. Some extensions don't use version control are not recommended.
 * Some extensions are also available in bundles, or package repositories.
 * 1) Install your extension..
 * Generally, at the end of the  file (but above the PHP end-of-code delimiter, " ", if present), the following line should be added:
 * This line forces the PHP interpreter to read the extension file, and thereby make it accessible to MediaWiki.
 * Some extensions can conflict with maintenance scripts, for example if they directly access $_SERVER (not recommended).
 * In this case they can be wrapped in the conditional so maintenance scripts can still run.
 * In this case they can be wrapped in the conditional so maintenance scripts can still run.


 * The maintenance script will fail for any extension which requires customized namespaces which is included inside the conditional above such as,.


 * Ensure that required permissions are set for extensions!
 * While this installation procedure is sufficient for most extensions, some require a different installation procedure. Check your extension's documentation for details.
 * If you want to alter configuration variables in LocalSettings.php, you have to do this typically after including the extension. Otherwise defaults defined in the extension will overwrite your settings.
 * While extension declaration can be placed in other places within the LocalSettings.php file, never place extensions before the  line for MediaWiki versions below 1.17 . Doing so will blank the extension setup function arrays, causing no extensions to be installed, and probably will make your wiki inaccessible until you fix it!

Upgrading an extension
Some extensions require to be updated whenever you update MediaWiki, while others work with multiple versions. To upgrade to a new version of an extension:


 * 1) Download the new version of the extension
 * 2) Replace all the extension files in the extension/ExtensionName directory with the new files. Do not remove the extension configuration present in LocalSettings.php
 * 3) Depending on the extension, you may have to run the Update.php maintenance script. Most extensions will mention if this script needs to be run or not. (Running the update.php script when its unnecessary will not hurt anything, so if you're unsure don't be afraid to run it). If you don't have command line access, you can also use the web updater.
 * 4) That's all you need to do. In most cases any extension configuration you have in LocalSettings.php will also work with the newer version of the extension.

These instructions cover 99% of extensions. If the specific extension you are upgrading has instructions that differ from these, you should probably follow the specific extension's instructions

Uninstalling an extension
Extensions are added by adding a line to LocalSettings.php, which basically looks like this:

Depending on the extension you want to uninstall additionally other stuff might be done on installation, which you want to undo now. For details see the section on installing an extension.


 * 1) Remove this line and the extension is uninstalled. If you want to, you can (and if you do not want to use this extension in the future you should) remove the files of this extension inside the folder "extensions/".
 * 2) Maybe you also have some other lines in LocalSettings.php, which have to do with the extension you want to remove. Most likely this will be lines, which give certain users the right to access pages, which are provided by the extension. These lines contain the variable "$wgGroupPermissions" and make some settings there. As far as they have to do with rights, which come from the removed extension, you can remove these lines as well.
 * 3) Maybe your extension also has added columns to your database. The updater maintenance/update.php removes them, when you run it, after you have uninstalled the extension.

Developing extensions
This complex topic is handled on the developing extensions manual page.