Add remove command to remove a package from the list of current installed packages

doc/03-cli.md

@@ -150,6 +150,24 @@ to the command.
 * **--no-progress:** Removes the progress display that can mess with some
   terminals or scripts which don't handle backspace characters.
 
+## remove
+
+The `remove` command removes packages from the `composer.json` file from
+the current directory.
+
+    $ php composer.phar remove <vendor/package>
+
+After removing the requirements, the modified requirements will be
+uninstalled.
+
+### Options
+* **--dry-run:** If you want to run through an uninstallation without actually
+  uninstalling a package, you can use `--dry-run`. This will simulate the
+  uninstallation and show you what would happen.
+* **--dev:** Add packages to `require-dev`.
+* **--no-update:** Only remove the package from the composer.json file, but
+  won't remove the files or update the composer.lock
+
 ## global
 
 The global command allows you to run other commands like `install`, `require`

src/Composer/Command/RemoveCommand.php

@@ -0,0 +1,106 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Command;
+
+use Composer\Config\JsonConfigSource;
+use Composer\Installer;
+use Composer\Plugin\CommandEvent;
+use Composer\Plugin\PluginEvents;
+use Composer\Json\JsonFile;
+use Composer\Factory;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @author Pierre du Plessis <pdples@gmail.com>
+ */
+class RemoveCommand extends Command
+{
+    protected function configure()
+    {
+        $this
+            ->setName('remove')
+            ->setDescription('Removes a package from the require or require-dev')
+            ->setDefinition(array(
+                new InputArgument('packages', InputArgument::IS_ARRAY, 'Packages that should be removed, if not provided all packages are.'),
+                new InputOption('dry-run', null, InputOption::VALUE_NONE, 'Outputs the operations but will not execute anything (implicitly enables --verbose).'),
+                new InputOption('dev', null, InputOption::VALUE_NONE, 'Removes a package from the require-dev section'),
+                new InputOption('verbose', 'v|vv|vvv', InputOption::VALUE_NONE, 'Shows more details including new commits pulled in when updating packages.'),
+                new InputOption('no-update', null, InputOption::VALUE_NONE, 'Disables the automatic update of the dependencies.')
+            ))
+            ->setHelp(<<<EOT
+The <info>remove</info> command removes a package from the current
+list of installed packages
+
+<info>php composer.phar remove</info>
+
+EOT
+            )
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $composer = $this->getComposer();
+        $packages = $input->getArgument('packages');
+
+        $io = $this->getIO();
+
+        $commandEvent = new CommandEvent(PluginEvents::COMMAND, 'remove', $input, $output);
+        $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);
+
+        $file = Factory::getComposerFile();
+
+        $json = new JsonFile($file);
+        $composerBackup = file_get_contents($json->getPath());
+
+        $json = new JsonConfigSource($json);
+
+        $type = $input->getOption('dev') ? 'require-dev' : 'require';
+
+        foreach ($packages as $package) {
+            $json->removeLink($type, $package);
+        }
+
+        if ($input->getOption('no-update')) {
+            if ($input->getOption('dry-run')) {
+                file_put_contents($json->getPath(), $composerBackup);
+            }
+
+            return 0;
+        }
+
+        $composer = Factory::create($io);
+
+        $install = Installer::create($io, $composer);
+
+        $install
+            ->setDryRun($input->getOption('dry-run'))
+            ->setVerbose($input->getOption('verbose'))
+            ->setDevMode($input->getOption('dev'))
+            ->setUpdate(true)
+            ->setUpdateWhitelist($packages)
+        ;
+
+        if (!$install->run()) {
+            $output->writeln("\n".'<error>Remove failed, reverting '.$file.' to its original content.</error>');
+            file_put_contents($json->getPath(), $composerBackup);
+
+            return 1;
+        }
+
+        return 0;
+    }
+}

src/Composer/Console/Application.php

@@ -227,6 +227,7 @@ class Application extends BaseApplication
         $commands[] = new Command\RunScriptCommand();
         $commands[] = new Command\LicensesCommand();
         $commands[] = new Command\GlobalCommand();
+        $commands[] = new Command\RemoveCommand();
 
         if ('phar:' === substr(__FILE__, 0, 5)) {
             $commands[] = new Command\SelfUpdateCommand();