initial commit

Model/Config/Source/Editors.php

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+<?php
+
+namespace Mnm\Whoops\Model\Config\Source;
+
+class Editors implements \Magento\Framework\Option\ArrayInterface
+{
+    public function toOptionArray()
+    {
+        return [
+            ['label' => 'Select default editor', 'value' => ''],
+            ['label' => 'phpstorm', 'value' => 'phpstorm'],
+            ['label' => 'vscode', 'value' => 'vscode'],
+            ['label' => 'sublime', 'value' => 'sublime'],
+            ['label' => 'textmate', 'value' => 'textmate'],
+            ['label' => 'emacs', 'value' => 'emacs'],
+            ['label' => 'macvim', 'value' => 'macvim'],
+            ['label' => 'idea', 'value' => 'idea'],
+        ];
+    }
+}

Plugin/ErrorHandler.php

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+<?php
+/**
+ * Whoops plugin for Magento 2
+ */
+
+namespace Mnm\Whoops\Plugin;
+
+class ErrorHandler
+{
+    private $appState;
+
+    private $request;
+
+    private $scopeConfig;
+
+    private $run;
+
+    public function __construct(
+        \Magento\Framework\App\State $appState,
+        \Magento\Framework\App\RequestInterface $request,
+        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
+    ) {
+        $this->appState = $appState;
+        $this->request = $request;
+        $this->scopeConfig = $scopeConfig;
+        $this->run = new \Whoops\Run;
+    }
+
+    public function beforelaunch()
+    {
+        if ($this->appState->getMode() == \Magento\Framework\App\State::MODE_DEVELOPER) {
+            if ($this->request->isXmlHttpRequest()) {
+                $handler = new \Whoops\Handler\JsonResponseHandler;
+            } else {
+                $handler = new \Whoops\Handler\PrettyPageHandler;
+                $editor = $this->scopeConfig->getValue('dev/debug/default_editor');
+                if ($editor) {
+                    $handler->setEditor($editor);
+                }
+            }
+            $this->run->pushHandler($handler);
+            $this->run->register();
+        }
+    }
+
+    public function beforeCatchException(
+        \Magento\Framework\App\Http $subject,
+        \Magento\Framework\App\Bootstrap $bootstrap,
+        \Exception $exception
+    ) {
+        if ($this->appState->getMode() == \Magento\Framework\App\State::MODE_DEVELOPER) {
+            $this->run->handleException($exception);
+        }
+    }
+}

README.md

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+# magento2 whoops error handler
+
+This is magento 2 module that adds Whoops error handling.
+
+    composer require --dev vaseemishak/magento2-whoops
+
+    ./bin/magento module:enable Mnm_Whoops
+    ./bin/magento setup:upgrade
+
+You can set default editor to open file with error from Whoops error page.
+    Magento admin page -> Stores -> Configuration -> Advanced -> Developer -> Debug -> Default editor for whoops

composer.json

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+{
+  "name": "vaseemishak/magento2-whoops",
+  "type": "magento2-module",
+  "license": "OSL-3.0",
+  "description": "Magento 2 Whoops error handler",
+  "require": {
+    "magento/framework": "^100.1.0|^101.0.0|^102.0.0",
+    "filp/whoops": "^2.1",
+    "php": ">=7.0.0",
+    "symfony/var-dumper": "3.2.*"
+  },
+  "autoload": {
+    "psr-4": {
+      "Mnm\\Whoops\\": ""
+    },
+    "files": [
+      "registration.php"
+    ]
+  }
+}

etc/adminhtml/system.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
+    <system>
+        <section id="dev">
+            <group id="debug">
+                <field id="default_editor" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="0" showInStore="0">
+                    <label>Default editor for whoops</label>
+                    <source_model>Mnm\Whoops\Model\Config\Source\Editors</source_model>
+                </field>
+            </group>
+        </section>
+    </system>
+</config>

etc/config.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
+    <default>
+        <dev>
+            <debug>
+                <default_editor></default_editor>
+            </debug>
+        </dev>
+    </default>
+</config>

etc/di.xml

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+<?xml version="1.0" ?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <type name="Magento\Framework\App\Http">
+        <plugin name="Mnm_Whoops_Plugin" type="\Mnm\Whoops\Plugin\ErrorHandler" />
+    </type>
+</config>

etc/module.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Mnm_Whoops" setup_version="1.0.0">
+    </module>
+</config>

registration.php

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+<?php
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(
+    ComponentRegistrar::MODULE,
+    'Mnm_Whoops',
+    __DIR__
+);