Added a "code editor" form type

assets/css/easyadmin-theme/forms.scss

@@ -468,3 +468,8 @@ form .invalid-feedback > .d-block + .d-block {
     text-align: right;
     top: 0;
 }
+
+// EasyAdminCodeType
+.field-easyadmin_code_editor .form-widget {
+    flex-basis: 65%;
+}

assets/css/form-type-code-editor.css

@@ -0,0 +1,24 @@
+@import '~codemirror/lib/codemirror.css';
+
+.CodeMirror {
+  font: 13px/1.5 SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Ubuntu Mono", "Courier New", monospace;
+  height: auto;
+  min-height: 45px;
+}
+
+.CodeMirror-wrap {
+  box-shadow: 0 0 0 1px rgba(43, 45, 80, .16), 0 0 0 1px rgba(6, 122, 184, 0), 0 0 0 2px rgba(6, 122, 184, 0), 0 1px 1px rgba(0, 0, 0, .08);;
+  border-radius: var(--border-radius);
+}
+
+.CodeMirror-gutters {
+  background: var(--gray-100);
+}
+
+.CodeMirror-linenumber {
+  color: var(--text-muted);
+}
+
+.CodeMirror-lines {
+  padding-bottom: 5px;
+}

assets/js/app.js

@@ -28,6 +28,7 @@ window.addEventListener('load', function() {
     $(document).on('easyadmin.collection.item-added', createAutoCompleteFields);
     createContentResizer();
     createNavigationToggler();
+    createCodeEditorFields();
 });
 
 function createNullableControls() {
@@ -138,3 +139,23 @@ function createNavigationToggler() {
         }
     });
 }
+
+// Code editor fields require extra JavaScript dependencies, which are loaded
+// dynamically only when there are code editor fields in the page
+function createCodeEditorFields()
+{
+    const codeEditorElements = document.querySelectorAll('[data-easyadmin-code-editor]');
+    if (codeEditorElements.length === 0) {
+        return;
+    }
+
+    const codeEditorJs = document.createElement('script');
+    codeEditorJs.setAttribute('src', codeEditorElements[0].dataset.jsUrl);
+
+    const codeEditorCss = document.createElement('link');
+    codeEditorCss.setAttribute('rel', 'stylesheet');
+    codeEditorCss.setAttribute('href', codeEditorElements[0].dataset.cssUrl);
+
+    document.querySelector('head').appendChild(codeEditorCss);
+    document.querySelector('body').appendChild(codeEditorJs);
+}

assets/js/form-type-code-editor.js

@@ -0,0 +1,31 @@
+require('../css/form-type-code-editor.css');
+
+import CodeMirror from 'codemirror';
+
+import 'codemirror/mode/css/css';
+import 'codemirror/mode/dockerfile/dockerfile';
+import 'codemirror/mode/javascript/javascript';
+import 'codemirror/mode/markdown/markdown';
+import 'codemirror/mode/nginx/nginx';
+import 'codemirror/mode/php/php';
+import 'codemirror/mode/shell/shell';
+import 'codemirror/mode/sql/sql';
+import 'codemirror/mode/twig/twig';
+import 'codemirror/mode/xml/xml';
+import 'codemirror/mode/yaml-frontmatter/yaml-frontmatter';
+import 'codemirror/mode/yaml/yaml';
+
+document.querySelectorAll('[data-easyadmin-code-editor]').forEach(function(codeBlock) {
+    CodeMirror.fromTextArea(codeBlock, {
+        autocapitalize: false,
+        autocorrect: false,
+        indentWithTabs: codeBlock.dataset.indentWithTabs,
+        lineNumbers: true,
+        lineWrapping: true,
+        mode: codeBlock.dataset.language,
+        scrollbarStyle: 'native',
+        spellcheck: false,
+        tabSize: codeBlock.dataset.tabSize,
+        theme: 'default',
+    });
+});

doc/book/edit-new-configuration.rst

@@ -384,8 +384,8 @@ These are the options that you can define for each field:
   done internally by the bundle). The allowed values are:
 
   * Any of the `Symfony Form types`_.
-  * Any of the custom EasyAdmin form types: ``easyadmin_autocomplete`` (they are
-    explained later in this chapter).
+  * Any of the custom EasyAdmin form types: ``code_editor``, ``easyadmin_autocomplete``
+    (they are explained later in this chapter).
 * ``type_options`` (optional), a hash with the options passed to the Symfony
   Form type used to render the field.
 
@@ -555,6 +555,56 @@ change this value (globally or per entity):
                     max_results: 5
         # ...
 
+Code Editor
+-----------
+
+It displays a JavaScript-based editor for source code. It provides advanced
+features such as code highlighting and smart indenting.
+
+.. code-block:: yaml
+
+    # config/packages/easy_admin.yaml
+    easy_admin:
+        entities:
+            Server:
+                class: App\Entity\Server
+                form:
+                    fields:
+                        - { property: 'config', type: 'code_editor', language: 'nginx' }
+                        # ...
+        # ...
+
+This type defines the following configuration options:
+
+* ``height``: the initial height of code blocks is the same as their contents
+  and it grows automatically as you add more contents. This option, which must
+  be an integer, sets the height of the code block element in pixels. If
+  contents don't fit, a scrollbar is displayed.
+* ``language``: sets the programming language used for the syntax highlighting
+  of the code (the language can't be autodetected from the contents). The available
+  languages are: ``css``, ``dockerfile``, ``js`` (equivalent to ``javascript``),
+  ``markdown``, ``nginx``, ``php``, ``shell``, ``sql``, ``twig``, ``xml``,
+  ``yaml-frontmatter`` (used in some blogs, CMS systems and static site
+  generators), ``yaml``.
+* ``tab_size``: an integer (default: ``4``) that defines the indention size (no
+  matter if the code uses white spaces or tabs).
+* ``indent_with_tabs``: if this boolean option is set to ``true``, code is
+   indented with real tabs instead of white spaces (default: ``false``).
+
+.. code-block:: yaml
+
+    # config/packages/easy_admin.yaml
+    easy_admin:
+        entities:
+            ExamQuestion:
+                class: App\Entity\ExamQuestion
+                form:
+                    fields:
+                        - { property: 'question', type: 'code_editor', language: 'yaml', height: 150, tab_size: 4 }
+                        - { property: 'codeSample', type: 'code_editor', language: 'php', height: 600, tab_size: 2 }
+                        # ...
+        # ...
+
 .. _edit-new-advanced-form-design:
 
 Advanced Form Design

package.json

@@ -4,6 +4,7 @@
     "@symfony/webpack-encore": "^0.21",
     "bootstrap": "^4.1.0",
     "bootstrap-rtl": "^3.3.4",
+    "codemirror": "^5.47.0",
     "cssnano": "^4.1.7",
     "featherlight": "^1.7.13",
     "jquery": "^3.3.1",

src/Form/Type/CodeEditorType.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace EasyCorp\Bundle\EasyAdminBundle\Form\Type;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\TextareaType;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\OptionsResolver\Options;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+/**
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+class CodeEditorType extends AbstractType
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function buildView(FormView $view, FormInterface $form, array $options): void
+    {
+        $view->vars['height'] = $options['height'];
+        $view->vars['tabSize'] = $options['tab_size'];
+        $view->vars['indentWithTabs'] = $options['indent_with_tabs'];
+        $view->vars['language'] = $options['language'];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver): void
+    {
+        $resolver->setDefaults([
+            'height' => null,
+            'tab_size' => 4,
+            'indent_with_tabs' => false,
+            // the code editor can't autodetect the language, so 'markdown' is used when
+            // no language is selected explicitly (because it's the most similar to regular text)
+            'language' => 'markdown',
+        ]);
+        $resolver->setAllowedTypes('height', ['null', 'int']);
+        $resolver->setAllowedTypes('tab_size', 'int');
+        $resolver->setAllowedTypes('indent_with_tabs', 'bool');
+        $resolver->setAllowedTypes('language', 'string');
+        $resolver->setAllowedValues('language', ['css', 'dockerfile', 'js', 'javascript', 'markdown', 'nginx', 'php', 'shell', 'sql', 'twig', 'xml', 'yaml-frontmatter', 'yaml']);
+
+        // define some programming language shortcuts for better UX (e.g. 'js' === 'javascript')
+        $resolver->setNormalizer('language', static function (Options $options, $language) {
+            if ('js' === $language) {
+                $language = 'javascript';
+            }
+
+            return $language;
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParent(): string
+    {
+        return TextareaType::class;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getBlockPrefix(): string
+    {
+        return 'easyadmin_code_editor';
+    }
+}

src/Form/Type/Configurator/CodeEditorTypeConfigurator.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace EasyCorp\Bundle\EasyAdminBundle\Form\Type\Configurator;
+
+use EasyCorp\Bundle\EasyAdminBundle\Form\Type\CodeEditorType;
+use Symfony\Component\Form\FormConfigInterface;
+
+/**
+ * This configurator is applied to any form field of type 'code_editor'.
+ *
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class CodeEditorTypeConfigurator implements TypeConfiguratorInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function configure($name, array $options, array $metadata, FormConfigInterface $parentConfig): array
+    {
+        if (isset($metadata['height'])) {
+            $options['height'] = $metadata['height'];
+        }
+        if (isset($metadata['tab_size'])) {
+            $options['tab_size'] = $metadata['tab_size'];
+        }
+        if (isset($metadata['indent_with_tabs'])) {
+            $options['indent_with_tabs'] = $metadata['indent_with_tabs'];
+        }
+        if (isset($metadata['language'])) {
+            $options['language'] = $metadata['language'];
+        }
+
+        return $options;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supports($type, array $options, array $metadata): bool
+    {
+        return \in_array($type, ['code_editor', CodeEditorType::class], true);
+    }
+}

src/Form/Util/FormTypeHelper.php

@@ -2,6 +2,7 @@
 
 namespace EasyCorp\Bundle\EasyAdminBundle\Form\Util;
 
+use EasyCorp\Bundle\EasyAdminBundle\Form\Type\CodeEditorType;
 use EasyCorp\Bundle\EasyAdminBundle\Form\Type\EasyAdminAutocompleteType;
 use EasyCorp\Bundle\EasyAdminBundle\Form\Type\EasyAdminDividerType;
 use EasyCorp\Bundle\EasyAdminBundle\Form\Type\EasyAdminFormType;
@@ -59,6 +60,9 @@ final class FormTypeHelper
         'button' => ButtonType::class,
         'checkbox' => CheckboxType::class,
         'choice' => ChoiceType::class,
+        // allow using underscore and dashes to improve DX
+        'code-editor' => CodeEditorType::class,
+        'code_editor' => CodeEditorType::class,
         'collection' => CollectionType::class,
         'color' => ColorType::class,
         'country' => CountryType::class,

src/Resources/config/form.xml

@@ -45,6 +45,11 @@
 
         <!-- Type Configurators -->
 
+        <service id="easyadmin.form.type.configurator.code_editor" public="false"
+                 class="EasyCorp\Bundle\EasyAdminBundle\Form\Type\Configurator\CodeEditorTypeConfigurator">
+            <tag name="easyadmin.form.type.configurator" priority="50" />
+        </service>
+
         <service id="easyadmin.form.type.configurator.textarea" public="false"
                  class="EasyCorp\Bundle\EasyAdminBundle\Form\Type\Configurator\TextareaTypeConfigurator">
             <tag name="easyadmin.form.type.configurator" priority="40" />