From: Alexander Ebert <ebert@woltlab.com>
Date: Tue, 11 Jul 2017 17:18:14 +0000 (+0200)
Subject: Added basic developer tools (wip)
X-Git-Tag: 3.1.0_Alpha_1~286
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d74244229b48ed31f8baf87ce93e326033ccf505;p=GitHub%2FWoltLab%2FWCF.git

Added basic developer tools (wip)

See #2331
---

diff --git a/com.woltlab.wcf/acpMenu.xml b/com.woltlab.wcf/acpMenu.xml
index a4e2365f7e..13ba392f2e 100644
--- a/com.woltlab.wcf/acpMenu.xml
+++ b/com.woltlab.wcf/acpMenu.xml
@@ -96,6 +96,26 @@
 				<icon>fa-plus</icon>
 			</acpmenuitem>
 			<!-- /other -->
+			
+			<!-- devtools -->
+			<acpmenuitem name="wcf.acp.menu.link.devtools">
+				<parent>wcf.acp.menu.link.configuration</parent>
+				<showorder>99</showorder>
+				<options>enable_developer_tools</options>
+			</acpmenuitem>
+			
+			<acpmenuitem name="wcf.acp.menu.link.devtools.project.list">
+				<parent>wcf.acp.menu.link.devtools</parent>
+				<controller>wcf\acp\page\DevtoolsProjectListPage</controller>
+				<permissions>admin.configuration.package.canInstallPackage</permissions>
+			</acpmenuitem>
+			<acpmenuitem name="wcf.acp.menu.link.devtools.project.add">
+				<parent>wcf.acp.menu.link.devtools.project.list</parent>
+				<controller>wcf\acp\form\DevtoolsProjectAddForm</controller>
+				<permissions>admin.configuration.package.canInstallPackage</permissions>
+				<icon>fa-plus</icon>
+			</acpmenuitem>
+			<!-- /devtools -->
 		
 		<!-- /configuration -->
 		
diff --git a/com.woltlab.wcf/option.xml b/com.woltlab.wcf/option.xml
index cd34b70350..a3aaf39649 100644
--- a/com.woltlab.wcf/option.xml
+++ b/com.woltlab.wcf/option.xml
@@ -21,6 +21,9 @@
 				<category name="module.community">
 					<parent>module</parent>
 				</category>
+				<category name="module.developer">
+					<parent>module</parent>
+				</category>
 			<!-- /modules -->
 			
 			<!-- general -->
@@ -282,18 +285,6 @@
 				<defaultvalue>0</defaultvalue>
 			</option>
 			
-			<option name="enable_debug_mode">
-				<categoryname>module.system</categoryname>
-				<optiontype>boolean</optiontype>
-				<defaultvalue>0</defaultvalue>
-			</option>
-			
-			<option name="enable_benchmark">
-				<categoryname>module.system</categoryname>
-				<optiontype>boolean</optiontype>
-				<defaultvalue>0</defaultvalue>
-			</option>
-			
 			<option name="visitor_use_tiny_build">
 				<categoryname>module.system</categoryname>
 				<optiontype>boolean</optiontype>
@@ -318,14 +309,6 @@
 				<defaultvalue>1</defaultvalue>
 			</option>
 			
-			<!--
-			<option name="enable_pluginstore_widget">
-				<categoryname>module.system</categoryname>
-				<optiontype>boolean</optiontype>
-				<defaultvalue>0</defaultvalue>
-			</option>
-			 -->
-			
 			<option name="module_system_recaptcha"><!-- @deprecated -->
 				<categoryname>module.system</categoryname>
 				<optiontype>boolean</optiontype>
@@ -424,6 +407,22 @@
 				<defaultvalue>0</defaultvalue>
 			</option>
 			
+			<option name="enable_debug_mode">
+				<categoryname>module.developer</categoryname>
+				<optiontype>boolean</optiontype>
+				<defaultvalue>0</defaultvalue>
+			</option>
+			<option name="enable_benchmark">
+				<categoryname>module.developer</categoryname>
+				<optiontype>boolean</optiontype>
+				<defaultvalue>0</defaultvalue>
+			</option>
+			<option name="enable_developer_tools">
+				<categoryname>module.developer</categoryname>
+				<optiontype>boolean</optiontype>
+				<defaultvalue>0</defaultvalue>
+			</option>
+			
 			<!-- general.page -->
 			<option name="page_title">
 				<categoryname>general.page</categoryname>
diff --git a/constants.php b/constants.php
index e801547f1f..72aad40baf 100644
--- a/constants.php
+++ b/constants.php
@@ -227,3 +227,4 @@ define('FB_SHARE_APP_ID', '');
 define('MODULE_CONTACT_FORM', 0);
 define('SITEMAP_INDEX_TIME_FRAME', 365);
 define('MODULE_TROPHY', 1);
+define('ENABLE_DEVELOPER_TOOLS', 0);
diff --git a/wcfsetup/install/files/acp/templates/devtoolsProjectAdd.tpl b/wcfsetup/install/files/acp/templates/devtoolsProjectAdd.tpl
new file mode 100644
index 0000000000..3cf36cd22c
--- /dev/null
+++ b/wcfsetup/install/files/acp/templates/devtoolsProjectAdd.tpl
@@ -0,0 +1,68 @@
+{include file='header' pageTitle='wcf.acp.devtools.project.'|concat:$action}
+
+<header class="contentHeader">
+	<div class="contentHeaderTitle">
+		<h1 class="contentTitle">{lang}wcf.acp.devtools.project.{$action}{/lang}</h1>
+	</div>
+	
+	<nav class="contentHeaderNavigation">
+		<ul>
+			<li><a href="{link controller='DevtoolsProjectList'}{/link}" class="button"><span class="icon icon16 fa-list"></span> <span>{lang}wcf.acp.menu.link.devtools.project.list{/lang}</span></a></li>
+			
+			{event name='contentHeaderNavigation'}
+		</ul>
+	</nav>
+</header>
+
+{include file='formError'}
+
+{if $success|isset}
+	<p class="success">{lang}wcf.global.success.{$action}{/lang}</p>
+{/if}
+
+<form method="post" action="{if $action == 'add'}{link controller='DevtoolsProjectAdd'}{/link}{else}{link controller='DevtoolsProjectEdit' id=$objectID}{/link}{/if}">
+	<div class="section">
+		<dl{if $errorField == 'name'} class="formError"{/if}>
+			<dt><label for="name">{lang}wcf.acp.devtools.project.name{/lang}</label></dt>
+			<dd>
+				<input type="text" id="name" name="name" value="{$name}" required autofocus class="long">
+				{if $errorField == 'name'}
+					<small class="innerError">
+						{if $errorType == 'empty'}
+							{lang}wcf.global.form.error.empty{/lang}
+						{else}
+							{lang}wcf.acp.devtools.project.name.error.{@$errorType}{/lang}
+						{/if}
+					</small>
+				{/if}
+			</dd>
+		</dl>
+		
+		<dl{if $errorField == 'path'} class="formError"{/if}>
+			<dt><label for="path">{lang}wcf.acp.devtools.project.path{/lang}</label></dt>
+			<dd>
+				<input type="text" id="path" name="path" value="{$path}" class="long">
+				{if $errorField == 'path'}
+					<small class="innerError">
+						{if $errorType == 'empty'}
+							{lang}wcf.global.form.error.{@$errorType}{/lang}
+						{else}
+							{lang}wcf.acp.devtools.project.path.error.{@$errorType}{/lang}
+						{/if}
+					</small>
+				{/if}
+			</dd>
+		</dl>
+		
+		{event name='dataFields'}
+	</div>
+	
+	{event name='sections'}
+	
+	<div class="formSubmit">
+		<input type="submit" value="{lang}wcf.global.button.submit{/lang}" accesskey="s">
+		{@SECURITY_TOKEN_INPUT_TAG}
+	</div>
+</form>
+
+{include file='footer'}
diff --git a/wcfsetup/install/files/acp/templates/devtoolsProjectList.tpl b/wcfsetup/install/files/acp/templates/devtoolsProjectList.tpl
new file mode 100644
index 0000000000..c763f85f24
--- /dev/null
+++ b/wcfsetup/install/files/acp/templates/devtoolsProjectList.tpl
@@ -0,0 +1,71 @@
+{include file='header' pageTitle='wcf.acp.devtools.project.list'}
+
+<script data-relocate="true">
+	$(function() {
+		new WCF.Action.Delete('wcf\\data\\cronjob\\CronjobAction', '.jsObjectRow');
+	});
+</script>
+
+<header class="contentHeader">
+	<div class="contentHeaderTitle">
+		<h1 class="contentTitle">{lang}wcf.acp.devtools.project.list{/lang}</h1>
+	</div>
+	
+	<nav class="contentHeaderNavigation">
+		<ul>
+			<li><a href="{link controller='DevtoolsProjectAdd'}{/link}" class="button"><span class="icon icon16 fa-plus"></span> <span>{lang}wcf.acp.devtools.project.add{/lang}</span></a></li>
+			
+			{event name='contentHeaderNavigation'}
+		</ul>
+	</nav>
+</header>
+
+{hascontent}
+	<div class="section tabularBox">
+		<table class="table">
+			<thead>
+				<tr>
+					<th class="columnID" colspan="2">{lang}wcf.global.objectID{/lang}</th>
+					<th class="columnText">{lang}wcf.acp.devtools.project.name{/lang}</th>
+					<th class="columnText">{lang}wcf.acp.devtools.project.path{/lang}</th>
+					<th class="columnIcon">{lang}wcf.acp.devtools.project.action{/lang}</th>
+					
+					{event name='columnHeads'}
+				</tr>
+			</thead>
+			
+			<tbody>
+				{content}
+					{foreach from=$objects item=object}
+						<tr class="jsObjectRow">
+							<td class="columnIcon">
+								<a href="{link controller='DevtoolsProjectEdit' id=$object->getObjectID()}{/link}" title="{lang}wcf.global.button.edit{/lang}" class="jsTooltip"><span class="icon icon16 fa-pencil"></span></a>
+								<span class="icon icon16 fa-times jsDeleteButton jsTooltip pointer" title="{lang}wcf.global.button.delete{/lang}" data-object-id="{@$object->getObjectID()}" data-confirm-message-html="{lang __encode=true}wcf.acp.devtools.project.delete.confirmMessage{/lang}"></span>
+							</td>
+							<td class="columnID">{@$object->getObjectID()}</td>
+							<td class="columnText"><a href="{link controller='DevtoolsProjectEdit' id=$object->getObjectID()}{/link}">{$object->name}</a></td>
+							<td class="columnText"><small>{$object->path}</small></td>
+							<td class="columnIcon">
+								<a href="{link controller='DevtoolsProjectSync' id=$object->getObjectID()}{/link}" class="button small">{lang}wcf.acp.devtools.project.sync{/lang}</a>
+							</td>
+						</tr>
+					{/foreach}
+				{/content}
+			</tbody>
+		</table>
+	</div>
+{hascontentelse}
+	<p class="info">{lang}wcf.global.noItems{/lang}</p>
+{/hascontent}
+
+<footer class="contentFooter">
+	<nav class="contentFooterNavigation">
+		<ul>
+			<li><a href="{link controller='DevtoolsProjectAdd'}{/link}" class="button"><span class="icon icon16 fa-plus"></span> <span>{lang}wcf.acp.devtools.project.add{/lang}</span></a></li>
+			
+			{event name='contentFooterNavigation'}
+		</ul>
+	</nav>
+</footer>
+
+{include file='footer'}
diff --git a/wcfsetup/install/files/acp/templates/devtoolsProjectSync.tpl b/wcfsetup/install/files/acp/templates/devtoolsProjectSync.tpl
new file mode 100644
index 0000000000..441289be05
--- /dev/null
+++ b/wcfsetup/install/files/acp/templates/devtoolsProjectSync.tpl
@@ -0,0 +1,127 @@
+{include file='header' pageTitle='wcf.acp.devtools.project.sync'}
+
+<header class="contentHeader">
+	<div class="contentHeaderTitle">
+		<h1 class="contentTitle">{lang}wcf.acp.devtools.project.sync{/lang}</h1>
+		<p class="contentHeaderDescription">{$object->name}</p>
+	</div>
+	
+	<nav class="contentHeaderNavigation">
+		<ul>
+			<li><a href="{link controller='DevtoolsProjectList'}{/link}" class="button"><span class="icon icon16 fa-list"></span> <span>{lang}wcf.acp.menu.link.devtools.project.list{/lang}</span></a></li>
+			
+			{event name='contentHeaderNavigation'}
+		</ul>
+	</nav>
+</header>
+
+{include file='formError'}
+
+{if $object->validate() === ''}
+	<p class="info">{lang}wcf.acp.devtools.pip.notice{/lang}</p>
+	
+	<form method="post" action="{link controller='DevtoolsProjectSync' id=$objectID}{/link}">
+		<div class="section">
+			<dl>
+				<dt></dt>
+				<dd>
+					<label><input type="checkbox" id="syncShowOnlyMatches" checked> {lang}wcf.acp.devtools.pip.showOnlyMatches{/lang}</label>
+					<small>{lang}wcf.acp.devtools.pip.showOnlyMatches.description{/lang}</small>
+				</dd>
+			</dl>
+		</div>
+		<div class="section tabularBox jsShowOnlyMatches" id="syncPipMatches">
+			<table class="table">
+				<thead>
+					<tr>
+						<th class="columnText">{lang}wcf.acp.devtools.pip.pluginName{/lang}</th>
+						<th class="columnText">{lang}wcf.acp.devtools.pip.defaultFilename{/lang}</th>
+						<th class="columnIcon">{lang}wcf.acp.devtools.pip.target{/lang}</th>
+					</tr>
+				</thead>
+				
+				<tbody>
+					{foreach from=$object->getPips() item=pip}
+						{assign var=_isSupported value=$pip->isSupported()}
+						{assign var=_targets value=$pip->getTargets($object)}
+						
+						<tr data-is-supported="{if $_isSupported}true{else}false{/if}" {if !$_targets|empty} class="jsHasPipTargets"{/if}>
+							<td class="columnText">{$pip->pluginName}</td>
+							{if $_isSupported}
+								<td class="columnText"><small>{$pip->getDefaultFilename()}</small></td>
+								<td class="columnIcon">
+									{hascontent}
+										<ul class="buttonGroup">
+											{content}
+												{foreach from=$_targets item=target}
+													<li><button class="small jsInvokePip" data-plugin-name="{$pip->pluginName}" data-target="{$target}">{$target}</button></li>
+												{/foreach}
+											{/content}
+										</ul>
+									{hascontentelse}
+										<small>{lang}wcf.acp.devtools.pip.target.noMatches{/lang}</small>
+									{/hascontent}
+								</td>
+							{else}
+								<td class="columnText" colspan="2">{$pip->getFirstError()}</td>
+							{/if}
+						</tr>
+					{/foreach}
+				</tbody>
+			</table>
+		</div>
+		
+		{event name='sections'}
+		
+		<div class="formSubmit">
+			<input type="submit" value="{lang}wcf.global.button.submit{/lang}" accesskey="s">
+			{@SECURITY_TOKEN_INPUT_TAG}
+		</div>
+	</form>
+	
+	<script data-relocate="true">
+		var container = elById('syncPipMatches');
+		elById('syncShowOnlyMatches').addEventListener('change', function() {
+			container.classList.toggle('jsShowOnlyMatches');
+		});
+		
+		require(['Ajax'], function(Ajax) {
+			var that = {
+				_ajaxSetup: function() {
+					return {
+						data: {
+							actionName: 'invoke',
+							className: 'wcf\\data\\package\\installation\\plugin\\PackageInstallationPluginAction',
+							parameters: {
+								projectID: {@$object->projectID}
+							}
+						}
+					}
+				}
+			};
+			
+			elBySelAll('.jsInvokePip', container, function(button) {
+				button.addEventListener(WCF_CLICK_EVENT, function(event) {
+					event.preventDefault();
+					
+					Ajax.api(that, {
+						parameters: {
+							pluginName: elData(button, 'plugin-name'),
+							target: elData(button, 'target')
+						}
+					});
+				});
+			});
+		});
+	</script>
+	
+	<style>
+		#syncPipMatches.jsShowOnlyMatches tbody > tr:not(.jsHasPipTargets) {
+			display: none;
+		}
+	</style>
+{else}
+	<p class="error">{$object->validate()}</p>
+{/if}
+
+{include file='footer'}
diff --git a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php
new file mode 100644
index 0000000000..ccf77c0e05
--- /dev/null
+++ b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php
@@ -0,0 +1,131 @@
+<?php
+namespace wcf\acp\form;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\data\devtools\project\DevtoolsProjectAction;
+use wcf\form\AbstractForm;
+use wcf\system\exception\UserInputException;
+use wcf\system\WCF;
+use wcf\util\FileUtil;
+use wcf\util\StringUtil;
+
+/**
+ * Shows the devtools project add form.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Acp\Form
+ * @since       3.1
+ */
+class DevtoolsProjectAddForm extends AbstractForm {
+	/**
+	 * @inheritDoc
+	 */
+	public $activeMenuItem = 'wcf.acp.menu.link.devtools.project.add';
+	
+	/**
+	 * @inheritDoc
+	 */
+	public $neededModules = ['ENABLE_DEVELOPER_TOOLS'];
+	
+	/**
+	 * @inheritDoc
+	 */
+	public $neededPermissions = ['admin.configuration.package.canInstallPackage'];
+	
+	/**
+	 * cronjob class name
+	 * @var	string
+	 */
+	public $name = '';
+	
+	/**
+	 * cronjob path
+	 * @var	string
+	 */
+	public $path = '';
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function readFormParameters() {
+		parent::readFormParameters();
+		
+		if (isset($_POST['name'])) $this->name = StringUtil::trim($_POST['name']);
+		if (isset($_POST['path'])) $this->path = StringUtil::trim($_POST['path']);
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function validate() {
+		parent::validate();
+		
+		// validate name
+		if (empty($this->name)) {
+			throw new UserInputException('name');
+		}
+		else {
+			$sql = "SELECT  COUNT(*) AS count
+				FROM    wcf".WCF_N."_devtools_project
+				WHERE   name = ?";
+			$statement = WCF::getDB()->prepareStatement($sql);
+			$statement->execute([$this->name]);
+			$count = $statement->fetchColumn();
+			if ($count > 0) {
+				throw new UserInputException('name', 'notUnique');
+			}
+		}
+		
+		// validate path
+		if (empty($this->path)) {
+			throw new UserInputException('path');
+		}
+		else {
+			$path = FileUtil::addTrailingSlash(FileUtil::unifyDirSeparator($this->path));
+			$errorType = DevtoolsProject::validatePath($path);
+			if ($errorType !== '') {
+				throw new UserInputException('path', $errorType);
+			}
+			
+			$this->path = $path;
+		}
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function save() {
+		parent::save();
+		
+		// save cronjob
+		$data = array_merge($this->additionalFields, [
+			'name' => $this->name,
+			'path' => $this->path
+		]);
+		
+		$this->objectAction = new DevtoolsProjectAction([], 'create', ['data' => $data]);
+		$this->objectAction->executeAction();
+		
+		$this->saved();
+		
+		// reset values
+		$this->name = $this->path = '';
+		
+		// show success message
+		WCF::getTPL()->assign('success', true);
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function assignVariables() {
+		parent::assignVariables();
+		
+		WCF::getTPL()->assign([
+			'name' => $this->name,
+			'path' => $this->path,
+			'action' => 'add'
+		]);
+	}
+}
diff --git a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php
new file mode 100644
index 0000000000..3c60a3a3e6
--- /dev/null
+++ b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php
@@ -0,0 +1,93 @@
+<?php
+namespace wcf\acp\form;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\data\devtools\project\DevtoolsProjectAction;
+use wcf\form\AbstractForm;
+use wcf\system\exception\IllegalLinkException;
+use wcf\system\WCF;
+
+/**
+ * Shows the devtools project edit form.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Acp\Form
+ * @since       3.1
+ */
+class DevtoolsProjectEditForm extends DevtoolsProjectAddForm {
+	/**
+	 * @inheritDoc
+	 */
+	public $activeMenuItem = 'wcf.acp.menu.link.devtools.project.list';
+	
+	/**
+	 * project id
+	 * @var	integer
+	 */
+	public $objectID = 0;
+	
+	/**
+	 * devtools project
+	 * @var	DevtoolsProject
+	 */
+	public $object;
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function readParameters() {
+		parent::readParameters();
+		
+		if (isset($_REQUEST['id'])) $this->objectID = intval($_REQUEST['id']);
+		$this->object = new DevtoolsProject($this->objectID);
+		if (!$this->object->projectID) {
+			throw new IllegalLinkException();
+		}
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function readData() {
+		parent::readData();
+		
+		if (empty($_POST)) {
+			$this->name = $this->object->name;
+			$this->path = $this->object->path;
+		}
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function save() {
+		AbstractForm::save();
+		
+		// update cronjob
+		$data = array_merge($this->additionalFields, [
+			'name' => $this->name,
+			'path' => $this->path
+		]);
+		
+		$this->objectAction = new DevtoolsProjectAction([$this->objectID], 'update', ['data' => $data]);
+		$this->objectAction->executeAction();
+		
+		$this->saved();
+		
+		// show success message
+		WCF::getTPL()->assign('success', true);
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function assignVariables() {
+		parent::assignVariables();
+		
+		WCF::getTPL()->assign([
+			'objectID' => $this->objectID,
+			'action' => 'edit'
+		]);
+	}
+}
diff --git a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectSyncForm.class.php b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectSyncForm.class.php
new file mode 100644
index 0000000000..67149beaab
--- /dev/null
+++ b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectSyncForm.class.php
@@ -0,0 +1,69 @@
+<?php
+namespace wcf\acp\form;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\form\AbstractForm;
+use wcf\system\exception\IllegalLinkException;
+use wcf\system\WCF;
+
+/**
+ * Shows the devtools project sync form.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Acp\Form
+ * @since       3.1
+ */
+class DevtoolsProjectSyncForm extends AbstractForm {
+	/**
+	 * @inheritDoc
+	 */
+	public $activeMenuItem = 'wcf.acp.menu.link.devtools.project.list';
+	
+	/**
+	 * @inheritDoc
+	 */
+	public $neededModules = ['ENABLE_DEVELOPER_TOOLS'];
+	
+	/**
+	 * @inheritDoc
+	 */
+	public $neededPermissions = ['admin.configuration.package.canInstallPackage'];
+	
+	/**
+	 * project id
+	 * @var	integer
+	 */
+	public $objectID = 0;
+	
+	/**
+	 * devtools project
+	 * @var DevtoolsProject
+	 */
+	public $object;
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function readParameters() {
+		parent::readParameters();
+		
+		if (isset($_REQUEST['id'])) $this->objectID = intval($_REQUEST['id']);
+		$this->object = new DevtoolsProject($this->objectID);
+		if (!$this->object->projectID) {
+			throw new IllegalLinkException();
+		}
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function assignVariables() {
+		parent::assignVariables();
+		
+		WCF::getTPL()->assign([
+			'objectID' => $this->objectID,
+			'object' => $this->object
+		]);
+	}
+}
diff --git a/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php b/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php
new file mode 100644
index 0000000000..855866bba1
--- /dev/null
+++ b/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php
@@ -0,0 +1,57 @@
+<?php
+namespace wcf\acp\page;
+use wcf\data\devtools\project\DevtoolsProjectList;
+use wcf\page\AbstractPage;
+use wcf\system\WCF;
+
+/**
+ * Shows a list of devtools projects.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Acp\Page
+ * @since	3.1
+ */
+class DevtoolsProjectListPage extends AbstractPage {
+	/**
+	 * @inheritDoc
+	 */
+	public $activeMenuItem = 'wcf.acp.menu.link.devtools.project.list';
+	
+	/**
+	 * @inheritDoc
+	 */
+	public $neededModules = ['ENABLE_DEVELOPER_TOOLS'];
+	
+	/**
+	 * @inheritDoc
+	 */
+	public $neededPermissions = ['admin.configuration.package.canInstallPackage'];
+	
+	/**
+	 * @var DevtoolsProjectList
+	 */
+	public $objectList;
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function readData() {
+		parent::readData();
+		
+		$this->objectList = new DevtoolsProjectList();
+		$this->objectList->readObjects();
+	}
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function assignVariables() {
+		parent::assignVariables();
+		
+		WCF::getTPL()->assign([
+			'objects' => $this->objectList
+		]);
+	}
+}
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php
new file mode 100644
index 0000000000..f8e5afc2dd
--- /dev/null
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php
@@ -0,0 +1,130 @@
+<?php
+namespace wcf\data\devtools\project;
+use wcf\data\DatabaseObject;
+use wcf\data\package\installation\plugin\PackageInstallationPluginList;
+use wcf\data\package\Package;
+use wcf\data\package\PackageCache;
+use wcf\system\devtools\package\DevtoolsPackageArchive;
+use wcf\system\devtools\pip\DevtoolsPip;
+use wcf\system\package\validation\PackageValidationException;
+use wcf\system\WCF;
+
+/**
+ * Represents a devtools project.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Devtools\Project
+ * @since	3.1
+ * 
+ * @property-read	integer		$projectID	unique id of the project
+ * @property-read	string		$name		internal name for display inside the ACP
+ * @property-read	string		$path		file system path
+ */
+class DevtoolsProject extends DatabaseObject {
+	/**
+	 * @var boolean
+	 */
+	protected $isCore;
+	
+	/**
+	 * @var Package
+	 */
+	protected $package;
+	
+	/**
+	 * @var DevtoolsPackageArchive
+	 */
+	protected $packageArchive;
+	
+	public function getPips() {
+		$pipList = new PackageInstallationPluginList();
+		$pipList->sqlOrderBy = 'pluginName';
+		$pipList->readObjects();
+		
+		$pips = [];
+		foreach ($pipList as $pip) {
+			$pips[] = new DevtoolsPip($pip);
+		}
+		
+		return $pips;
+	}
+	
+	public function validate() {
+		$errorType = self::validatePath($this->path);
+		if ($errorType !== '') {
+			return WCF::getLanguage()->get('wcf.acp.devtools.project.path.error.' . $errorType);
+		}
+		
+		return $this->validatePackageXml();
+	}
+	
+	public function isCore() {
+		if ($this->isCore === null) {
+			$this->isCore = self::pathIsCore($this->path);
+		}
+		
+		return $this->isCore;
+	}
+	
+	public function validatePackageXml() {
+		$packageXml = $this->path . ($this->isCore() ? 'com.woltlab.wcf/' : '') . 'package.xml';
+		$this->packageArchive = new DevtoolsPackageArchive($packageXml);
+		try {
+			$this->packageArchive->openArchive();
+		}
+		catch (PackageValidationException $e) {
+			return $e->getErrorMessage();
+		}
+		
+		$this->package = PackageCache::getInstance()->getPackageByIdentifier($this->packageArchive->getPackageInfo('name'));
+		if ($this->package === null) {
+			return WCF::getLanguage()->getDynamicVariable('wcf.acp.devtools.project.path.error.notInstalled', [
+				'package' => $this->packageArchive->getPackageInfo('name')
+			]);
+		}
+		
+		return '';
+	}
+	
+	/**
+	 * @return      Package
+	 */
+	public function getPackage() {
+		return $this->package;
+	}
+	
+	/**
+	 * @return      DevtoolsPackageArchive
+	 */
+	public function getPackageArchive() {
+		return $this->packageArchive;
+	}
+	
+	/**
+	 * Validates the provided path and returns an error code
+	 * if the path does not exist (`notFound`) or if there is
+	 * no package.xml (`packageXml`).
+	 * 
+	 * @param       string          $path
+	 * @return      string
+	 */
+	public static function validatePath($path) {
+		if (!is_dir($path)) {
+			return 'notFound';
+		}
+		else if (!file_exists($path . 'package.xml')) {
+			// check if this is `com.woltlab.wcf`
+			if (!self::pathIsCore($path)) {
+				return 'packageXml';
+			}
+		}
+		
+		return '';
+	}
+	
+	public static function pathIsCore($path) {
+		return (is_dir($path . 'com.woltlab.wcf') && file_exists($path . 'com.woltlab.wcf/package.xml'));
+	}
+}
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php
new file mode 100644
index 0000000000..0ff5cc0868
--- /dev/null
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php
@@ -0,0 +1,22 @@
+<?php
+namespace wcf\data\devtools\project;
+use wcf\data\AbstractDatabaseObjectAction;
+
+/**
+ * Executes devtools project related actions.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Data\Devtools\Project
+ * @since	3.1
+ * 
+ * @method	DevtoolsProjectEditor[]	getObjects()
+ * @method	DevtoolsProjectEditor	getSingleObject()
+ */
+class DevtoolsProjectAction extends AbstractDatabaseObjectAction {
+	/**
+	 * @inheritDoc
+	 */
+	protected $className = DevtoolsProjectEditor::class;
+}
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php
new file mode 100644
index 0000000000..3d37476054
--- /dev/null
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php
@@ -0,0 +1,23 @@
+<?php
+namespace wcf\data\devtools\project;
+use wcf\data\DatabaseObjectEditor;
+
+/**
+ * Provides functions to edit devtool projects.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Data\Devtools\Project
+ * @since	3.1
+ * 
+ * @method static	DevtoolsProject	create(array $parameters = [])
+ * @method		DevtoolsProject	getDecoratedObject()
+ * @mixin		DevtoolsProject
+ */
+class DevtoolsProjectEditor extends DatabaseObjectEditor {
+	/**
+	 * @inheritDoc
+	 */
+	protected static $baseClass = DevtoolsProject::class;
+}
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php
new file mode 100644
index 0000000000..01f22fcea5
--- /dev/null
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php
@@ -0,0 +1,24 @@
+<?php
+namespace wcf\data\devtools\project;
+use wcf\data\DatabaseObjectList;
+
+/**
+ * Represents a list of devtools projects.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\Data\Devtools\Project
+ * @since	3.1
+ *
+ * @method	DevtoolsProject		current()
+ * @method	DevtoolsProject[]	getObjects()
+ * @method	DevtoolsProject|null	search($objectID)
+ * @property	DevtoolsProject[]	$objects
+ */
+class DevtoolsProjectList extends DatabaseObjectList {
+	/**
+	 * @inheritDoc
+	 */
+	public $className = DevtoolsProject::class;
+}
diff --git a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php
index c5b58defb4..7c7beabb51 100644
--- a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php
@@ -1,6 +1,18 @@
 <?php
 namespace wcf\data\package\installation\plugin;
 use wcf\data\AbstractDatabaseObjectAction;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\system\cache\CacheHandler;
+use wcf\system\devtools\pip\DevtoolsPackageInstallationDispatcher;
+use wcf\system\devtools\pip\DevtoolsPip;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
+use wcf\system\exception\PermissionDeniedException;
+use wcf\system\exception\UserInputException;
+use wcf\system\package\plugin\IPackageInstallationPlugin;
+use wcf\system\package\SplitNodeException;
+use wcf\system\search\SearchIndexManager;
+use wcf\system\version\VersionTracker;
+use wcf\system\WCF;
 
 /**
  * Executes package installation plugin-related actions.
@@ -19,4 +31,76 @@ class PackageInstallationPluginAction extends AbstractDatabaseObjectAction {
 	 * @inheritDoc
 	 */
 	protected $className = PackageInstallationPluginEditor::class;
+	
+	/**
+	 * @inheritDoc
+	 */
+	protected $requireACP = ['invoke'];
+	
+	/**
+	 * @var DevtoolsPip
+	 */
+	public $devtoolsPip;
+	
+	/**
+	 * @var PackageInstallationPlugin
+	 */
+	public $packageInstallationPlugin;
+	
+	/**
+	 * @var DevtoolsProject
+	 */
+	public $project;
+	
+	public function validateInvoke() {
+		if (!ENABLE_DEVELOPER_TOOLS || !WCF::getSession()->getPermission('admin.configuration.package.canInstallPackage')) {
+			throw new PermissionDeniedException();
+		}
+		
+		$this->readString('pluginName');
+		$this->readInteger('projectID');
+		$this->readString('target');
+		
+		$this->project = new DevtoolsProject($this->parameters['projectID']);
+		if (!$this->project->projectID || $this->project->validate() !== '') {
+			throw new UserInputException('projectID');
+		}
+		
+		$this->packageInstallationPlugin = new PackageInstallationPlugin($this->parameters['pluginName']);
+		if (!$this->packageInstallationPlugin->pluginName) {
+			throw new UserInputException('pluginName');
+		}
+		
+		$this->devtoolsPip = new DevtoolsPip($this->packageInstallationPlugin);
+		$targets = $this->devtoolsPip->getTargets($this->project);
+		if (!in_array($this->parameters['target'], $targets)) {
+			throw new UserInputException('target');
+		}
+	}
+	
+	public function invoke() {
+		$dispatcher = new DevtoolsPackageInstallationDispatcher($this->project);
+		/** @var IIdempotentPackageInstallationPlugin $pip */
+		$pip = new $this->packageInstallationPlugin->className($dispatcher, [
+			'value' => $this->devtoolsPip->getInstructionValue($this->project, $this->parameters['target'])
+		]);
+		
+		try {
+			$pip->update();
+		}
+		catch (SplitNodeException $e) {
+			throw new \RuntimeException("PIP '{$this->packageInstallationPlugin->pluginName}' is not allowed to throw a 'SplitNodeException'.");
+		}
+		
+		// clear cache
+		
+		// TODO: use a central method instead!
+		
+		// create search index tables
+		SearchIndexManager::getInstance()->createSearchIndices();
+		
+		VersionTracker::getInstance()->createStorageTables();
+		
+		CacheHandler::getInstance()->flushAll();
+	}
 }
diff --git a/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php b/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php
index 1ac668db6d..5ad414e490 100644
--- a/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php
@@ -20,7 +20,7 @@ use wcf\util\FileUtil;
 class ApplicationHandler extends SingletonFactory {
 	/**
 	 * application cache
-	 * @var	Application[]
+	 * @var	mixed[][]
 	 */
 	protected $cache;
 	
@@ -162,6 +162,16 @@ class ApplicationHandler extends SingletonFactory {
 		return null;
 	}
 	
+	/**
+	 * Returns the list of application abbreviations.
+	 * 
+	 * @return      string[]
+	 * @since       3.1
+	 */
+	public function getAbbreviations() {
+		return array_keys($this->cache['abbreviation']);
+	}
+	
 	/**
 	 * Returns true if given $url is an internal URL.
 	 * 
diff --git a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php
new file mode 100644
index 0000000000..1494becc2f
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php
@@ -0,0 +1,21 @@
+<?php
+namespace wcf\system\devtools\package;
+use wcf\system\package\PackageArchive;
+
+/**
+ * @method		DevtoolsTar	getTar()
+ */
+class DevtoolsPackageArchive extends PackageArchive {
+	protected $packageXmlPath = '';
+	
+	/** @noinspection PhpMissingParentConstructorInspection */
+	public function __construct($packageXmlPath) {
+		$this->packageXmlPath = $packageXmlPath;
+	}
+	
+	public function openArchive() {
+		$this->tar = new DevtoolsTar(['package.xml' => $this->packageXmlPath]);
+		
+		$this->readPackageInfo();
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php
new file mode 100644
index 0000000000..31fe02184b
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php
@@ -0,0 +1,32 @@
+<?php
+namespace wcf\system\devtools\package;
+use wcf\system\io\Tar;
+
+class DevtoolsTar extends Tar {
+	protected $files = '';
+	
+	/** @noinspection PhpMissingParentConstructorInspection */
+	public function __construct(array $files) {
+		$this->files = $files;
+	}
+	
+	public function registerFile($filename, $fullPath) {
+		$this->files[$filename] = $fullPath;
+	}
+	
+	public function getIndexByFilename($filename) {
+		return (isset($this->files[$filename]) ? $filename : false);
+	}
+	
+	public function extractToString($index) {
+		if (!isset($this->files[$index])) {
+			throw new \RuntimeException("DevtoolsTar does not permit reading any files except for the explicitly registered ones.");
+		}
+		
+		return file_get_contents($this->files[$index]);
+	}
+	
+	public function extract($index, $destination) {
+		copy($this->files[$index], $destination);
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php
new file mode 100644
index 0000000000..484f78ed15
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php
@@ -0,0 +1,30 @@
+<?php
+namespace wcf\system\devtools\pip;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\system\devtools\package\DevtoolsPackageArchive;
+use wcf\system\package\PackageInstallationDispatcher;
+
+class DevtoolsPackageInstallationDispatcher extends PackageInstallationDispatcher {
+	/**
+	 * @var DevtoolsPackageArchive
+	 */
+	protected $project;
+	
+	public function __construct(DevtoolsProject $project) {
+		parent::__construct(new DevtoolsPackageInstallationQueue($project));
+		
+		$this->project = $project;
+	}
+	
+	public function getArchive() {
+		return $this->project->getPackageArchive();
+	}
+	
+	public function getPackageID() {
+		return $this->project->getPackage()->packageID;
+	}
+	
+	public function getPackageName() {
+		return $this->project->getPackage()->getName();
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php
new file mode 100644
index 0000000000..6845c88522
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php
@@ -0,0 +1,22 @@
+<?php
+namespace wcf\system\devtools\pip;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\data\package\installation\queue\PackageInstallationQueue;
+use wcf\system\WCF;
+
+class DevtoolsPackageInstallationQueue extends PackageInstallationQueue {
+	public function __construct(DevtoolsProject $project) {
+		parent::__construct(null, [
+			'queueID' => 0,
+			'parentQueueID' => 0,
+			'processNo' => 0,
+			'userID' => WCF::getUser()->userID,
+			'package' => $project->getPackage()->package,
+			'packageName' => $project->getPackage()->getName(),
+			'archive' => '',
+			'action' => 'update',
+			'done' => 0,
+			'isApplication' => $project->getPackage()->isApplication
+		]);
+	}
+}
\ No newline at end of file
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php
new file mode 100644
index 0000000000..54e19a1974
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php
@@ -0,0 +1,198 @@
+<?php
+namespace wcf\system\devtools\pip;
+use wcf\data\devtools\project\DevtoolsProject;
+use wcf\data\package\installation\plugin\PackageInstallationPlugin;
+use wcf\data\DatabaseObjectDecorator;
+use wcf\system\application\ApplicationHandler;
+use wcf\system\exception\NotImplementedException;
+use wcf\system\WCF;
+
+/**
+ * Wrapper class for package installation plugins for use with the sync feature.
+ *
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\System\Devtools\Pip
+ * @since       3.1
+ * 
+ * @method	PackageInstallationPlugin	getDecoratedObject()
+ * @mixin	PackageInstallationPlugin
+ */
+class DevtoolsPip extends DatabaseObjectDecorator {
+	/**
+	 * @inheritDoc
+	 */
+	protected static $baseClass = PackageInstallationPlugin::class;
+	
+	/**
+	 * Returns true if the PIP class can be found.
+	 * 
+	 * @return      boolean
+	 */
+	public function classExists() {
+		return class_exists($this->getDecoratedObject()->className);
+	}
+	
+	/**
+	 * Returns true if the PIP is expected to be idempotent.
+	 * 
+	 * @return      boolean
+	 */
+	public function isIdempotent() {
+		return is_subclass_of($this->getDecoratedObject()->className, IIdempotentPackageInstallationPlugin::class);
+	}
+	
+	/**
+	 * Returns the default filename of this PIP.
+	 * 
+	 * @return      string
+	 */
+	public function getDefaultFilename() {
+		return call_user_func([$this->getDecoratedObject()->className, 'getDefaultFilename']);
+	}
+	
+	/**
+	 * Returns true if the PIP exists, has a default filename and is idempotent.
+	 * 
+	 * @return      boolean
+	 */
+	public function isSupported() {
+		return $this->classExists() && $this->getDefaultFilename() && $this->isIdempotent();
+	}
+	
+	/**
+	 * Returns the first validation error.
+	 * 
+	 * @return      string
+	 */
+	public function getFirstError() {
+		if (!$this->classExists()) {
+			return WCF::getLanguage()->getDynamicVariable('wcf.acp.devtools.pip.error.className', ['className' => $this->getDecoratedObject()->className]);
+		}
+		else if (!$this->isIdempotent()) {
+			return WCF::getLanguage()->get('wcf.acp.devtools.pip.error.notIdempotent');
+		}
+		else if (!$this->getDefaultFilename()) {
+			return WCF::getLanguage()->get('wcf.acp.devtools.pip.error.defaultFilename');
+		}
+		
+		throw new \LogicException("Please call `isSupported()` to check for potential errors.");
+	}
+	
+	/**
+	 * Returns the list of valid targets for this pip.
+	 * 
+	 * @param       DevtoolsProject         $project
+	 * @return      string[]
+	 */
+	public function getTargets(DevtoolsProject $project) {
+		if (!$this->isSupported()) {
+			return [];
+		}
+		
+		$path = $project->path;
+		$defaultFilename = $this->getDefaultFilename();
+		$targets = [];
+		
+		// the core uses a significantly different file layout
+		if ($project->isCore()) {
+			switch ($this->getDecoratedObject()->pluginName) {
+				case 'acpTemplate':
+				case 'file':
+				case 'template':
+					// these pips are satisfied by definition
+					return [$defaultFilename];
+					
+				case 'language':
+					foreach (glob($path . 'wcfsetup/install/lang/*.xml') as $file) {
+						$targets[] = basename($file);
+					}
+					
+					// `glob()` returns files in an arbitrary order
+					sort($targets, SORT_NATURAL);
+					
+					return $targets;
+			}
+			
+			if (strpos($defaultFilename, '*') !== false) {
+				foreach (glob($path . 'com.woltlab.wcf/' . $defaultFilename) as $file) {
+					$targets[] = basename($file);
+				}
+				
+				// `glob()` returns files in an arbitrary order
+				sort($targets, SORT_NATURAL);
+			}
+			else {
+				if (file_exists($path . 'com.woltlab.wcf/' . $defaultFilename)) {
+					$targets[] = $defaultFilename;
+				}
+			}
+		}
+		else {
+			if (preg_match('~^(?<filename>.*)\.tar$~', $defaultFilename, $match)) {
+				if (is_dir($path . $match['filename'])) {
+					$targets[] = $defaultFilename;
+				}
+				
+				// check for application-specific pips too
+				foreach (ApplicationHandler::getInstance()->getAbbreviations() as $abbreviation) {
+					if (is_dir($path . $match['filename'] . '_' . $abbreviation)) {
+						$targets[] = $match['filename'] . "_{$abbreviation}.tar";
+					}
+				}
+			}
+			else {
+				if (strpos($defaultFilename, '*') !== false) {
+					foreach (glob($path . $defaultFilename) as $file) {
+						$targets[] = basename($file);
+					}
+					
+					// `glob()` returns files in an arbitrary order
+					sort($targets, SORT_NATURAL);
+				}
+				else {
+					if (file_exists($path . $defaultFilename)) {
+						$targets[] = $defaultFilename;
+					}
+				}
+			}
+		}
+		
+		return $targets;
+	}
+	
+	public function getInstructionValue(DevtoolsProject $project, $target) {
+		$defaultFilename = $this->getDefaultFilename();
+		
+		if ($project->isCore()) {
+			switch ($this->getDecoratedObject()->pluginName) {
+				case 'acpTemplate':
+				case 'file':
+				case 'template':
+					throw new NotImplementedException();
+					break;
+				
+				case 'language':
+					$filename = "wcfsetup/install/lang/{$target}";
+					$project->getPackageArchive()->getTar()->registerFile($filename, $project->path . $filename);
+					
+					return $filename;
+					
+				default:
+					$filename = "com.woltlab.wcf/{$target}";
+					$project->getPackageArchive()->getTar()->registerFile($filename, $project->path . $filename);
+					
+					return $filename;
+			}
+		}
+		else {
+			if (strpos($defaultFilename, '*') !== false) {
+				$filename = str_replace('*', $target, $defaultFilename);
+				$project->getPackageArchive()->getTar()->registerFile($filename, $project->path . $filename);
+			}
+		}
+		
+		throw new NotImplementedException();
+	}
+}
\ No newline at end of file
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php
new file mode 100644
index 0000000000..9022c096dd
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php
@@ -0,0 +1,23 @@
+<?php
+namespace wcf\system\devtools\pip;
+use wcf\system\package\plugin\IPackageInstallationPlugin;
+
+/**
+ * Default interface for package installation plugins that indicate to have
+ * no side-effects when run more than once. Furthermore such plugins may not
+ * throw a `SplitNodeException` during its normal operation.
+ * 
+ * This is especially important for the developer tools that rely on PIPs
+ * being invokable at any point, regardless if they have been ran before.
+ * 
+ * Classic examples include the menu-PIPs that will at most update existing
+ * data, but not cause items to be duplicated when evaluated once more. The
+ * opposite is the sql-PIP that (usually) contains non-repeatable instructions.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2017 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\System\Devtools\Pip
+ * @since       3.1
+ */
+interface IIdempotentPackageInstallationPlugin extends IPackageInstallationPlugin {}
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php
index c934b050a6..9d3298ecf9 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php
@@ -234,6 +234,10 @@ class PackageInstallationDispatcher {
 							'debug',
 							'mail_send_method'
 						]);
+						$statement->execute([
+							1,
+							'enable_developer_tools'
+						]);
 					}
 					
 					// update options.inc.php
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php
index 6e794a2a52..a9026f6040 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\acl\option\ACLOptionEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 
@@ -12,7 +13,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class ACLOptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin {
+class ACLOptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php
index af1422c5c2..c6b61b31f4 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\acp\search\provider\ACPSearchProviderEditor;
 use wcf\system\cache\builder\ACPSearchProviderCacheBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 
 /**
@@ -12,7 +13,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class ACPSearchProviderPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class ACPSearchProviderPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php
index e70a901e72..34871b5789 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\application\Application;
 use wcf\data\package\Package;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\package\ACPTemplatesFileHandler;
 use wcf\system\package\PackageArchive;
@@ -15,7 +16,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class ACPTemplatePackageInstallationPlugin extends AbstractPackageInstallationPlugin {
+class ACPTemplatePackageInstallationPlugin extends AbstractPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php
index eb6a89e7ef..9cf09cda94 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php
@@ -1,5 +1,6 @@
 <?php
 namespace wcf\system\package\plugin;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
@@ -12,7 +13,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-abstract class AbstractMenuPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+abstract class AbstractMenuPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php
index 578129ecc0..ad9959f770 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\package\Package;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
@@ -13,7 +14,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-abstract class AbstractOptionPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+abstract class AbstractOptionPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php
index 2735b3c905..8f80ceaa62 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php
@@ -5,6 +5,7 @@ use wcf\data\bbcode\BBCode;
 use wcf\data\bbcode\BBCodeEditor;
 use wcf\data\package\PackageCache;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
@@ -17,7 +18,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  */
-class BBCodePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class BBCodePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php
index dc2aaeb64c..5266bc02d8 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\package\plugin;
 use wcf\data\box\Box;
 use wcf\data\box\BoxEditor;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\language\LanguageFactory;
 use wcf\system\WCF;
@@ -16,7 +17,7 @@ use wcf\system\WCF;
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  * @since	3.0
  */
-class BoxPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class BoxPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php
index e6187480ae..1f8bce012b 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\clipboard\action\ClipboardActionEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 
 /**
@@ -12,7 +13,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  */
-class ClipboardActionPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class ClipboardActionPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php
index 39fda983d5..1306e68363 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\core\object\CoreObjectEditor;
 use wcf\system\cache\builder\CoreObjectCacheBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 
 /**
@@ -12,7 +13,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class CoreObjectPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class CoreObjectPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php
index a21133432d..b83aefd1b4 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\cronjob\CronjobEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 use wcf\util\CronjobUtil;
 use wcf\util\StringUtil;
@@ -14,7 +15,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  */
-class CronjobPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class CronjobPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php
index 3a73d9a942..ee1d778e05 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\package\plugin;
 use wcf\data\event\listener\EventListener;
 use wcf\data\event\listener\EventListenerEditor;
 use wcf\system\cache\builder\EventListenerCacheBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
 
@@ -14,7 +15,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class EventListenerPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class EventListenerPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php
index 762c69956a..a0501a7489 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\application\Application;
 use wcf\data\package\Package;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\package\FilesFileHandler;
 use wcf\system\package\PackageArchive;
@@ -17,7 +18,7 @@ use wcf\util\StyleUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class FilePackageInstallationPlugin extends AbstractPackageInstallationPlugin {
+class FilePackageInstallationPlugin extends AbstractPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php
index 9e2045721e..3813e55ed4 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\package\plugin;
 use wcf\data\language\Language;
 use wcf\data\language\LanguageEditor;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\package\PackageArchive;
 use wcf\system\WCF;
@@ -16,7 +17,7 @@ use wcf\util\XML;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class LanguagePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class LanguagePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php
index 141602630e..b2e5099c0e 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\menu\item\MenuItem;
 use wcf\data\menu\item\MenuItemEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 
@@ -14,7 +15,7 @@ use wcf\system\WCF;
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  * @since	3.0
  */
-class MenuItemPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class MenuItemPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php
index fb572434df..f2f1563a8a 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php
@@ -6,6 +6,7 @@ use wcf\data\menu\Menu;
 use wcf\data\menu\MenuEditor;
 use wcf\data\menu\MenuList;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 
@@ -18,7 +19,7 @@ use wcf\system\WCF;
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  * @since	3.0
  */
-class MenuPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class MenuPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * box meta data per menu
 	 * @var	string[]
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php
index 47d2f0233e..6fa72676e1 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\object\type\definition\ObjectTypeDefinitionEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 
 /**
@@ -11,7 +12,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  */
-class ObjectTypeDefinitionPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class ObjectTypeDefinitionPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php
index b594d71087..f0597d50d6 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\object\type\ObjectTypeEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 
@@ -12,7 +13,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  */
-class ObjectTypePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class ObjectTypePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php
index 44feafe3ae..190106f4b9 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\package\plugin;
 use wcf\data\option\Option;
 use wcf\data\option\OptionEditor;
 use wcf\data\package\Package;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
@@ -15,7 +16,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class OptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin {
+class OptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php
index d7aae82062..e033c38159 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\package\installation\plugin\PackageInstallationPluginEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 
 /**
@@ -11,7 +12,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class PIPPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class PIPPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php
index 5174f79aa4..7daf6a3f32 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\package\plugin;
 use wcf\data\package\PackageCache;
 use wcf\data\page\Page;
 use wcf\data\page\PageEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\language\LanguageFactory;
 use wcf\system\request\RouteHandler;
@@ -19,7 +20,7 @@ use wcf\util\StringUtil;
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  * @since	3.0
  */
-class PagePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class PagePackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php
index 68d0f81125..596a6cf304 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\smiley\SmileyEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 
 /**
@@ -11,7 +12,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\Acp\Package\Plugin
  */
-class SmileyPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class SmileyPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php
index d424c53da5..a3b3d9fcac 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\template\listener\TemplateListenerEditor;
 use wcf\system\cache\builder\TemplateListenerCodeCacheBuilder;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
 
@@ -13,7 +14,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class TemplateListenerPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class TemplateListenerPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php
index 80ec131a70..fcf275bfae 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\application\Application;
 use wcf\data\package\Package;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\package\PackageArchive;
 use wcf\system\package\TemplatesFileHandler;
@@ -15,7 +16,7 @@ use wcf\system\WCF;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class TemplatePackageInstallationPlugin extends AbstractPackageInstallationPlugin {
+class TemplatePackageInstallationPlugin extends AbstractPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php
index 3d173dd672..05b52721ab 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\package\plugin;
 use wcf\data\user\group\option\UserGroupOption;
 use wcf\data\user\group\option\UserGroupOptionEditor;
 use wcf\data\user\group\UserGroup;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
 
@@ -14,7 +15,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class UserGroupOptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin {
+class UserGroupOptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * list of group ids by type
 	 * @var	integer[][]
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php
index 9f130c8e4a..ec90935e00 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php
@@ -2,6 +2,7 @@
 namespace wcf\system\package\plugin;
 use wcf\data\user\notification\event\UserNotificationEvent;
 use wcf\data\user\notification\event\UserNotificationEventEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
@@ -14,7 +15,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class UserNotificationEventPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class UserNotificationEventPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php
index 588ce951e6..3f509b99a8 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php
@@ -4,6 +4,7 @@ use wcf\data\user\option\category\UserOptionCategory;
 use wcf\data\user\option\category\UserOptionCategoryEditor;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\option\UserOptionEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
@@ -16,7 +17,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class UserOptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin {
+class UserOptionPackageInstallationPlugin extends AbstractOptionPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php
index e81c49c83c..23ba0ca631 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\package\plugin;
 use wcf\data\user\profile\menu\item\UserProfileMenuItemEditor;
+use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
 
@@ -12,7 +13,7 @@ use wcf\util\StringUtil;
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	WoltLabSuite\Core\System\Package\Plugin
  */
-class UserProfileMenuPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin {
+class UserProfileMenuPackageInstallationPlugin extends AbstractXMLPackageInstallationPlugin implements IIdempotentPackageInstallationPlugin {
 	/**
 	 * @inheritDoc
 	 */
diff --git a/wcfsetup/install/lang/de.xml b/wcfsetup/install/lang/de.xml
index 34ac9e4638..dfeadd24f3 100644
--- a/wcfsetup/install/lang/de.xml
+++ b/wcfsetup/install/lang/de.xml
@@ -370,6 +370,24 @@
 		<item name="wcf.acp.dataImport.started"><![CDATA[Import begonnen.]]></item>
 	</category>
 	
+	<category name="wcf.acp.devtools">
+		<item name="wcf.acp.devtools.project.action"><![CDATA[Aktionen]]></item>
+		<item name="wcf.acp.devtools.project.add"><![CDATA[Projekt hinzufügen]]></item>
+		<item name="wcf.acp.devtools.project.edit"><![CDATA[Projekt bearbeiten]]></item>
+		<item name="wcf.acp.devtools.project.list"><![CDATA[Projekte]]></item>
+		<item name="wcf.acp.devtools.project.name"><![CDATA[Name]]></item>
+		<item name="wcf.acp.devtools.project.path"><![CDATA[Pfad]]></item>
+		<item name="wcf.acp.devtools.project.sync"><![CDATA[Daten-Abgleich]]></item>
+		<item name="wcf.acp.devtools.pip.defaultFilename"><![CDATA[Suchmuster]]></item>
+		<item name="wcf.acp.devtools.pip.error.notIdempotent"><![CDATA[Das PIP unterstützt keinen wiederholten Import und kann nur bei einem Update verarbeitet werden.]]></item>
+		<item name="wcf.acp.devtools.pip.notice"><![CDATA[Bestehende Anweisungen in der <kbd>package.xml</kbd> werden nicht berücksichtigt; es können somit auch PIPs importiert werden, für die noch keine Anweisungen hinterlegt worden sind. Es werden nur die Standardpfade bei der Suche verwendet, zusätzlich werden anwendungsbezogene Suffixe (z. B. <kbd>files_wcf.tar</kbd>) für <kbd>.tar</kbd>-basierte PIPs unterstützt.]]></item>
+		<item name="wcf.acp.devtools.pip.pluginName"><![CDATA[PIP-Bezeichner]]></item>
+		<item name="wcf.acp.devtools.pip.showOnlyMatches"><![CDATA[Zeige nur übereinstimmende PIPs an]]></item>
+		<item name="wcf.acp.devtools.pip.showOnlyMatches.description"><![CDATA[Es werden nur PIPs angeboten, die für den wiederholten Import geeignet sind und für die es eine Entsprechung auf Basis des Standard-Dateinamens existiert.]]></item>
+		<item name="wcf.acp.devtools.pip.target"><![CDATA[Übereinstimmungen]]></item>
+		<item name="wcf.acp.devtools.pip.target.noMatches"><![CDATA[(Keine Treffer)]]></item>
+	</category>
+	
 	<category name="wcf.acp.exceptionLog">
 		<item name="wcf.acp.exceptionLog"><![CDATA[Protokollierte Fehler]]></item>
 		<item name="wcf.acp.exceptionLog.exception.message"><![CDATA[Fehlermeldung]]></item>
@@ -855,6 +873,8 @@
 		<item name="wcf.acp.menu.link.trophy.list"><![CDATA[Trophäen]]></item>
 		<item name="wcf.acp.menu.link.trophy.add"><![CDATA[Trophäe hinzufügen]]></item>
 		<item name="wcf.acp.menu.link.trophy.edit"><![CDATA[Trophäe bearbeiten]]></item>
+		<item name="wcf.acp.menu.link.devtools"><![CDATA[Entwickler-Werkzeuge]]></item>
+		<item name="wcf.acp.menu.link.devtools.project.list"><![CDATA[Projekte auflisten]]></item>
 	</category>
 	
 	<category name="wcf.acp.notice">
@@ -1313,6 +1333,9 @@ GmbH=Gesellschaft mit beschränkter Haftung]]></item>
 		<item name="wcf.acp.option.module_contact_form"><![CDATA[Kontakt-Formular aktivieren]]></item>
 		<item name="wcf.acp.option.module_contact_form.description"><![CDATA[Aktiviert das Kontakt-Formular, nach Aktivierung können Sie die <a href="{link controller='ContactSettings'}{/link}">Eingabefelder und Empfänger</a> individuell konfigurieren.]]></item>
 		<item name="wcf.acp.option.module_trophy"><![CDATA[Trophäen]]></item>
+		<item name="wcf.acp.option.category.module.developer"><![CDATA[Entwickler]]></item>
+		<item name="wcf.acp.option.enable_developer_tools"><![CDATA[Entwickler-Werkzeuge aktivieren]]></item>
+		<item name="wcf.acp.option.enable_developer_tools.description"><![CDATA[Aktiviert spezielle Werkzeuge die für die Plugin-Entwicklung verwendet werden.]]></item>
 	</category>
 	
 	<category name="wcf.acp.customOption">
diff --git a/wcfsetup/setup/db/install.sql b/wcfsetup/setup/db/install.sql
index e3a9dc04f1..12984db6bc 100644
--- a/wcfsetup/setup/db/install.sql
+++ b/wcfsetup/setup/db/install.sql
@@ -481,6 +481,13 @@ CREATE TABLE wcf1_cronjob_log (
 	error TEXT
 );
 
+DROP TABLE IF EXISTS wcf1_devtools_project;
+CREATE TABLE wcf1_devtools_project (
+	projectID INT(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,
+	name VARCHAR(191) NOT NULL,
+	path TEXT
+);
+
 DROP TABLE IF EXISTS wcf1_edit_history_entry;
 CREATE TABLE wcf1_edit_history_entry (
 	entryID INT(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,