111 lines
4.0 KiB
Markdown
111 lines
4.0 KiB
Markdown
<!--
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tagline: Script are callbacks that are called before/after installing packages
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-->
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# Scripts
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## What is a script?
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A script, in Composer's terms, can either be a PHP callback (defined as a
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static method) or any command-line executable command. Scripts are useful
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for executing a package's custom code or package-specific commands during
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the Composer execution process.
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**NOTE: Only scripts defined in the root package's `composer.json` are
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executed. If a dependency of the root package specifies its own scripts,
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Composer does not execute those additional scripts.**
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## Event names
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Composer fires the following named events during its execution process:
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- **pre-install-cmd**: occurs before the `install` command is executed.
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- **post-install-cmd**: occurs after the `install` command is executed.
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- **pre-update-cmd**: occurs before the `update` command is executed.
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- **post-update-cmd**: occurs after the `update` command is executed.
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- **pre-status-cmd**: occurs before the `status` command is executed.
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- **post-status-cmd**: occurs after the `status` command is executed.
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- **pre-package-install**: occurs before a package is installed.
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- **post-package-install**: occurs after a package is installed.
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- **pre-package-update**: occurs before a package is updated.
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- **post-package-update**: occurs after a package is updated.
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- **pre-package-uninstall**: occurs before a package has been uninstalled.
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- **post-package-uninstall**: occurs after a package has been uninstalled.
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- **pre-autoload-dump**: occurs before the autoloader is dumped, either
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during `install`/`update`, or via the `dump-autoload` command.
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- **post-autoload-dump**: occurs after the autoloader is dumped, either
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during `install`/`update`, or via the `dump-autoload` command.
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- **post-root-package-install**: occurs after the root package has been
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installed, during the `create-project` command.
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- **post-create-project-cmd**: occurs after the `create-project` command is
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executed.
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## Defining scripts
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The root JSON object in `composer.json` should have a property called
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`"scripts"`, which contains pairs of named events and each event's
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corresponding scripts. An event's scripts can be defined as either as a string
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(only for a single script) or an array (for single or multiple scripts.)
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For any given event:
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- Scripts execute in the order defined when their corresponding event is fired.
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- An array of scripts wired to a single event can contain both PHP callbacks
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and command-line executables commands.
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- PHP classes containing defined callbacks must be autoloadable via Composer's
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autoload functionality.
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Script definition example:
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{
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"scripts": {
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"post-update-cmd": "MyVendor\\MyClass::postUpdate",
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"post-package-install": [
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"MyVendor\\MyClass::postPackageInstall"
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],
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"post-install-cmd": [
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"MyVendor\\MyClass::warmCache",
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"phpunit -c app/"
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]
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}
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}
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Using the previous definition example, here's the class `MyVendor\MyClass`
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that might be used to execute the PHP callbacks:
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<?php
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namespace MyVendor;
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use Composer\Script\Event;
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class MyClass
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{
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public static function postUpdate(Event $event)
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{
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$composer = $event->getComposer();
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// do stuff
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}
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public static function postPackageInstall(Event $event)
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{
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$installedPackage = $event->getOperation()->getPackage();
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// do stuff
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}
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public static function warmCache(Event $event)
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{
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// make cache toasty
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}
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}
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When an event is fired, Composer's internal event handler receives a
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`Composer\Script\Event` object, which is passed as the first argument to your
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PHP callback. This `Event` object has getters for other contextual objects:
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- `getComposer()`: returns the current instance of `Composer\Composer`
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- `getName()`: returns the name of the event being fired as a string
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- `getIO()`: returns the current input/output stream which implements
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`Composer\IO\IOInterface` for writing to the console
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