MediaWiki coding conventions

Abstract

This project implements a set of rules for use with PHP CodeSniffer.

See MediaWiki conventions on our wiki for a detailed description of the coding conventions that are validated by these rules. :-)

How to install

Create a composer.json which adds this project as a dependency:

{
	"require-dev": {
		"mediawiki/mediawiki-codesniffer": "40.0.1"
	},
	"scripts": {
		"test": [
			"phpcs -p -s"
		],
		"fix": "phpcbf"
	}
}

Create a .phpcs.xml with our configuration:

<?xml version="1.0"?>
<ruleset>
	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki"/>
	<file>.</file>
	<arg name="bootstrap" value="./vendor/mediawiki/mediawiki-codesniffer/utils/bootstrap-ci.php"/>
	<arg name="extensions" value="php"/>
	<arg name="encoding" value="UTF-8"/>
</ruleset>

Install: composer update
Run: composer test
Run: composer fix to auto-fix some of the errors, others might need manual intervention.
Commit!

Note that for most MediaWiki projects, we'd also recommend adding a PHP linter to your composer.json – see the full documentation for more details.

Configuration

Some of the sniffs provided by this codesniffer standard allow you to configure details of how they work.

MediaWiki.Classes.FullQualifiedClassName: This sniff is disabled by default.

<rule ref="MediaWiki.Classes.FullQualifiedClassName">
    <severity>5</severity>
    <properties>
        <property name="allowMainNamespace" value="false" />
        <property name="allowInheritance" value="false" />
        <property name="allowFunctions" value="false" />
    </properties>
</rule>

MediaWiki.Usage.ExtendClassUsage: This sniff lets you exclude globals from being reported by the sniff, in case they cannot be replaced with a Config::getConfig() call. Examples that are already in the list include $wgTitle and $wgUser.
```
<rule ref="MediaWiki.Usage.ExtendClassUsage">
    <properties>
        <property name="nonConfigGlobals[]" type="array" value="$wg...,$wg..." />
    </properties>
</rule>
```

MediaWiki.Commenting.ClassLevelLicense: This sniff does nothing by default.

<rule ref="MediaWiki.Commenting.ClassLevelLicense">
    <properties>
        <property name="license" value="GPL-2.0-or-later" />
    </properties>
</rule>

MediaWiki.NamingConventions.PrefixedGlobalFunctions: This sniff lets you define a list of ignored global functions and a list of allowed prefixes. By default the only allowed prefix is 'wf', corresponding to the global function wf...().
```
<rule ref="MediaWiki.NamingConventions.PrefixedGlobalFunctions">
    <properties>
        <property name="allowedPrefixes[]" value="wf,..." />
        <property name="ignoreList[]" value="...,..." />
    </properties>
</rule>
```

MediaWiki.NamingConventions.ValidGlobalName: This sniff lets you define a list of ignored globals and a list of allowed prefixes. By default the only allowed prefix is 'wg', for global variables $wg....

<rule ref="MediaWiki.NamingConventions.ValidGlobalName">
    <properties>
        <property name="allowedPrefixes[]" value="wg,..." />
        <property name="ignoreList[]" value="...,..." />
    </properties>
</rule>

MediaWiki.Arrays.TrailingComma: This sniff lets you enforce that multi-line arrays have trailing commas, which makes Git diffs nicer. It can also enforce that single-line arrays have no trailing comma. By default, it does nothing.
```
<rule ref="MediaWiki.Arrays.TrailingComma">
    <properties>
        <property name="singleLine" value="false" />
        <property name="multiLine" value="true" />
    </properties>
</rule>
```