Initial work on the new composer iisntaller plugin to handle installing things to there proper locations

Author: detain

.gitignore

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+/vendor/

composer.json

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+{
+    "name": "detain/myadmin_composer_plugin",
+    "description": "A composer plugin to handle the various types of 3rd party software we deal with in MyAdmin",
+    "type": "composer-plugin",
+    "license": "GPL",
+    "authors": [
+        {
+            "name": "Joe Huss",
+            "email": "detain@interserver.net"
+        }
+    ],
+    "autoload"": {
+        "psr-0": {"detain\\": "include/"}
+    },
+    "require": {
+        "composer-plugin-api": "^1.0"
+    },
+    "extra": {
+         "class":  "detain\\Composer\\TemplateInstallerPlugin""
+    },
+    "minimum-stability": "dev"
+}

include/Composer/Installer.php

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+<?php
+
+namespace detain\Composer;
+
+use Composer\Package\PackageInterface;
+use Composer\Installer\LibraryInstaller;
+
+class TemplateInstaller extends LibraryInstaller
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function getInstallPath(PackageInterface $package)
+    {
+        $prefix = substr($package->getPrettyName(), 0, 23);
+        if ('myadmin/template-' !== $prefix) {
+            throw new \InvalidArgumentException(
+                'Unable to install template, myadmin templates '
+                .'should always start their package name with '
+                .'"myadmin/template-"'
+            );
+        }
+
+        return 'data/templates/'.substr($package->getPrettyName(), 23);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function supports($packageType)
+    {
+        return 'myadmin-template' === $packageType;
+    }
+}

include/Composer/Plugin.php

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+<?php
+
+namespace detain\Composer;
+
+use Composer\Composer;
+use Composer\IO\IOInterface;
+use Composer\Plugin\PluginInterface;
+
+class TemplateInstallerPlugin implements PluginInterface
+{
+    public function activate(Composer $composer, IOInterface $io)
+    {
+        $installer = new TemplateInstaller($io, $composer);
+        $composer->getInstallationManager()->addInstaller($installer);
+    }
+}