10 files changed, 1046 insertions, 0 deletions
diff --git a/web_src/js/features/comp/ComboMarkdownEditor.js b/web_src/js/features/comp/ComboMarkdownEditor.js
new file mode 100644
index 00000000..70e92de0
--- /dev/null
+++ b/web_src/js/features/comp/ComboMarkdownEditor.js
@@ -0,0 +1,413 @@
+import '@github/markdown-toolbar-element';
+import '@github/text-expander-element';
+import $ from 'jquery';
+import {attachTribute} from '../tribute.js';
+import {hideElem, showElem, autosize, isElemVisible} from '../../utils/dom.js';
+import {initEasyMDEPaste, initTextareaPaste} from './Paste.js';
+import {handleGlobalEnterQuickSubmit} from './QuickSubmit.js';
+import {renderPreviewPanelContent} from '../repo-editor.js';
+import {easyMDEToolbarActions} from './EasyMDEToolbarActions.js';
+import {initTextExpander} from './TextExpander.js';
+import {showErrorToast} from '../../modules/toast.js';
+import {POST} from '../../modules/fetch.js';
+
+let elementIdCounter = 0;
+
+/**
+ * validate if the given textarea is non-empty.
+ * @param {HTMLElement} textarea - The textarea element to be validated.
+ * @returns {boolean} returns true if validation succeeded.
+ */
+export function validateTextareaNonEmpty(textarea) {
+  // When using EasyMDE, the original edit area HTML element is hidden, breaking HTML5 input validation.
+  // The workaround (https://github.com/sparksuite/simplemde-markdown-editor/issues/324) doesn't work with contenteditable, so we just show an alert.
+  if (!textarea.value) {
+    if (isElemVisible(textarea)) {
+      textarea.required = true;
+      const form = textarea.closest('form');
+      form?.reportValidity();
+    } else {
+      // The alert won't hurt users too much, because we are dropping the EasyMDE and the check only occurs in a few places.
+      showErrorToast('Require non-empty content');
+    }
+    return false;
+  }
+  return true;
+}
+
+class ComboMarkdownEditor {
+  constructor(container, options = {}) {
+    container._giteaComboMarkdownEditor = this;
+    this.options = options;
+    this.container = container;
+  }
+
+  async init() {
+    this.prepareEasyMDEToolbarActions();
+    this.setupContainer();
+    this.setupTab();
+    this.setupDropzone();
+    this.setupTextarea();
+
+    await this.switchToUserPreference();
+  }
+
+  applyEditorHeights(el, heights) {
+    if (!heights) return;
+    if (heights.minHeight) el.style.minHeight = heights.minHeight;
+    if (heights.height) el.style.height = heights.height;
+    if (heights.maxHeight) el.style.maxHeight = heights.maxHeight;
+  }
+
+  setupContainer() {
+    initTextExpander(this.container.querySelector('text-expander'));
+    this.container.addEventListener('ce-editor-content-changed', (e) => this.options?.onContentChanged?.(this, e));
+  }
+
+  setupTextarea() {
+    this.textarea = this.container.querySelector('.markdown-text-editor');
+    this.textarea._giteaComboMarkdownEditor = this;
+    this.textarea.id = `_combo_markdown_editor_${String(elementIdCounter++)}`;
+    this.textarea.addEventListener('input', (e) => this.options?.onContentChanged?.(this, e));
+    this.applyEditorHeights(this.textarea, this.options.editorHeights);
+
+    if (this.textarea.getAttribute('data-disable-autosize') !== 'true') {
+      this.textareaAutosize = autosize(this.textarea, {viewportMarginBottom: 130});
+    }
+
+    this.textareaMarkdownToolbar = this.container.querySelector('markdown-toolbar');
+    this.textareaMarkdownToolbar.setAttribute('for', this.textarea.id);
+    for (const el of this.textareaMarkdownToolbar.querySelectorAll('.markdown-toolbar-button')) {
+      // upstream bug: The role code is never executed in base MarkdownButtonElement https://github.com/github/markdown-toolbar-element/issues/70
+      el.setAttribute('role', 'button');
+      // the editor usually is in a form, so the buttons should have "type=button", avoiding conflicting with the form's submit.
+      if (el.nodeName === 'BUTTON' && !el.getAttribute('type')) el.setAttribute('type', 'button');
+    }
+    this.textareaMarkdownToolbar.querySelector('button[data-md-action="indent"]')?.addEventListener('click', () => {
+      this.indentSelection(false);
+    });
+    this.textareaMarkdownToolbar.querySelector('button[data-md-action="unindent"]')?.addEventListener('click', () => {
+      this.indentSelection(true);
+    });
+
+    this.textarea.addEventListener('keydown', (e) => {
+      if (e.shiftKey) {
+        e.target._shiftDown = true;
+      }
+      if (e.key === 'Enter' && !e.shiftKey && !e.ctrlKey && !e.altKey) {
+        if (!this.breakLine()) return; // Nothing changed, let the default handler work.
+        this.options?.onContentChanged?.(this, e);
+        e.preventDefault();
+      }
+    });
+    this.textarea.addEventListener('keyup', (e) => {
+      if (!e.shiftKey) {
+        e.target._shiftDown = false;
+      }
+    });
+
+    const monospaceButton = this.container.querySelector('.markdown-switch-monospace');
+    const monospaceEnabled = localStorage?.getItem('markdown-editor-monospace') === 'true';
+    const monospaceText = monospaceButton.getAttribute(monospaceEnabled ? 'data-disable-text' : 'data-enable-text');
+    monospaceButton.setAttribute('data-tooltip-content', monospaceText);
+    monospaceButton.setAttribute('aria-checked', String(monospaceEnabled));
+
+    monospaceButton?.addEventListener('click', (e) => {
+      e.preventDefault();
+      const enabled = localStorage?.getItem('markdown-editor-monospace') !== 'true';
+      localStorage.setItem('markdown-editor-monospace', String(enabled));
+      this.textarea.classList.toggle('tw-font-mono', enabled);
+      const text = monospaceButton.getAttribute(enabled ? 'data-disable-text' : 'data-enable-text');
+      monospaceButton.setAttribute('data-tooltip-content', text);
+      monospaceButton.setAttribute('aria-checked', String(enabled));
+    });
+
+    const easymdeButton = this.container.querySelector('.markdown-switch-easymde');
+    easymdeButton?.addEventListener('click', async (e) => {
+      e.preventDefault();
+      this.userPreferredEditor = 'easymde';
+      await this.switchToEasyMDE();
+    });
+
+    if (this.dropzone) {
+      initTextareaPaste(this.textarea, this.dropzone);
+    }
+  }
+
+  setupDropzone() {
+    const dropzoneParentContainer = this.container.getAttribute('data-dropzone-parent-container');
+    if (dropzoneParentContainer) {
+      this.dropzone = this.container.closest(this.container.getAttribute('data-dropzone-parent-container'))?.querySelector('.dropzone');
+    }
+  }
+
+  setupTab() {
+    const $container = $(this.container);
+    const tabs = $container[0].querySelectorAll('.tabular.menu > .item');
+
+    // Fomantic Tab requires the "data-tab" to be globally unique.
+    // So here it uses our defined "data-tab-for" and "data-tab-panel" to generate the "data-tab" attribute for Fomantic.
+    const tabEditor = Array.from(tabs).find((tab) => tab.getAttribute('data-tab-for') === 'markdown-writer');
+    const tabPreviewer = Array.from(tabs).find((tab) => tab.getAttribute('data-tab-for') === 'markdown-previewer');
+    tabEditor.setAttribute('data-tab', `markdown-writer-${elementIdCounter}`);
+    tabPreviewer.setAttribute('data-tab', `markdown-previewer-${elementIdCounter}`);
+    const panelEditor = $container[0].querySelector('.ui.tab[data-tab-panel="markdown-writer"]');
+    const panelPreviewer = $container[0].querySelector('.ui.tab[data-tab-panel="markdown-previewer"]');
+    panelEditor.setAttribute('data-tab', `markdown-writer-${elementIdCounter}`);
+    panelPreviewer.setAttribute('data-tab', `markdown-previewer-${elementIdCounter}`);
+    elementIdCounter++;
+
+    tabEditor.addEventListener('click', () => {
+      requestAnimationFrame(() => {
+        this.focus();
+      });
+    });
+
+    $(tabs).tab();
+
+    this.previewUrl = tabPreviewer.getAttribute('data-preview-url');
+    this.previewContext = tabPreviewer.getAttribute('data-preview-context');
+    this.previewMode = this.options.previewMode ?? 'comment';
+    this.previewWiki = this.options.previewWiki ?? false;
+    tabPreviewer.addEventListener('click', async () => {
+      const formData = new FormData();
+      formData.append('mode', this.previewMode);
+      formData.append('context', this.previewContext);
+      formData.append('text', this.value());
+      formData.append('wiki', this.previewWiki);
+      const response = await POST(this.previewUrl, {data: formData});
+      const data = await response.text();
+      renderPreviewPanelContent($(panelPreviewer), data);
+    });
+  }
+
+  prepareEasyMDEToolbarActions() {
+    this.easyMDEToolbarDefault = [
+      'bold', 'italic', 'strikethrough', '|', 'heading-1', 'heading-2', 'heading-3',
+      'heading-bigger', 'heading-smaller', '|', 'code', 'quote', '|', 'gitea-checkbox-empty',
+      'gitea-checkbox-checked', '|', 'unordered-list', 'ordered-list', '|', 'link', 'image',
+      'table', 'horizontal-rule', '|', 'gitea-switch-to-textarea',
+    ];
+  }
+
+  parseEasyMDEToolbar(EasyMDE, actions) {
+    this.easyMDEToolbarActions = this.easyMDEToolbarActions || easyMDEToolbarActions(EasyMDE, this);
+    const processed = [];
+    for (const action of actions) {
+      const actionButton = this.easyMDEToolbarActions[action];
+      if (!actionButton) throw new Error(`Unknown EasyMDE toolbar action ${action}`);
+      processed.push(actionButton);
+    }
+    return processed;
+  }
+
+  async switchToUserPreference() {
+    if (this.userPreferredEditor === 'easymde') {
+      await this.switchToEasyMDE();
+    } else {
+      this.switchToTextarea();
+    }
+  }
+
+  switchToTextarea() {
+    if (!this.easyMDE) return;
+    showElem(this.textareaMarkdownToolbar);
+    if (this.easyMDE) {
+      this.easyMDE.toTextArea();
+      this.easyMDE = null;
+    }
+  }
+
+  async switchToEasyMDE() {
+    if (this.easyMDE) return;
+    // EasyMDE's CSS should be loaded via webpack config, otherwise our own styles can not overwrite the default styles.
+    const {default: EasyMDE} = await import(/* webpackChunkName: "easymde" */'easymde');
+    const easyMDEOpt = {
+      autoDownloadFontAwesome: false,
+      element: this.textarea,
+      forceSync: true,
+      renderingConfig: {singleLineBreaks: false},
+      indentWithTabs: false,
+      tabSize: 4,
+      spellChecker: false,
+      inputStyle: 'contenteditable', // nativeSpellcheck requires contenteditable
+      nativeSpellcheck: true,
+      ...this.options.easyMDEOptions,
+    };
+    easyMDEOpt.toolbar = this.parseEasyMDEToolbar(EasyMDE, easyMDEOpt.toolbar ?? this.easyMDEToolbarDefault);
+
+    this.easyMDE = new EasyMDE(easyMDEOpt);
+    this.easyMDE.codemirror.on('change', (...args) => {this.options?.onContentChanged?.(this, ...args)});
+    this.easyMDE.codemirror.setOption('extraKeys', {
+      'Cmd-Enter': (cm) => handleGlobalEnterQuickSubmit(cm.getTextArea()),
+      'Ctrl-Enter': (cm) => handleGlobalEnterQuickSubmit(cm.getTextArea()),
+      Enter: (cm) => {
+        const tributeContainer = document.querySelector('.tribute-container');
+        if (!tributeContainer || tributeContainer.style.display === 'none') {
+          cm.execCommand('newlineAndIndent');
+        }
+      },
+      Up: (cm) => {
+        const tributeContainer = document.querySelector('.tribute-container');
+        if (!tributeContainer || tributeContainer.style.display === 'none') {
+          return cm.execCommand('goLineUp');
+        }
+      },
+      Down: (cm) => {
+        const tributeContainer = document.querySelector('.tribute-container');
+        if (!tributeContainer || tributeContainer.style.display === 'none') {
+          return cm.execCommand('goLineDown');
+        }
+      },
+    });
+    this.applyEditorHeights(this.container.querySelector('.CodeMirror-scroll'), this.options.editorHeights);
+    await attachTribute(this.easyMDE.codemirror.getInputField(), {mentions: true, emoji: true});
+    initEasyMDEPaste(this.easyMDE, this.dropzone);
+    hideElem(this.textareaMarkdownToolbar);
+  }
+
+  value(v = undefined) {
+    if (v === undefined) {
+      if (this.easyMDE) {
+        return this.easyMDE.value();
+      }
+      return this.textarea.value;
+    }
+
+    if (this.easyMDE) {
+      this.easyMDE.value(v);
+    } else {
+      this.textarea.value = v;
+    }
+    this.textareaAutosize?.resizeToFit();
+  }
+
+  focus() {
+    if (this.easyMDE) {
+      this.easyMDE.codemirror.focus();
+    } else {
+      this.textarea.focus();
+    }
+  }
+
+  moveCursorToEnd() {
+    this.textarea.focus();
+    this.textarea.setSelectionRange(this.textarea.value.length, this.textarea.value.length);
+    if (this.easyMDE) {
+      this.easyMDE.codemirror.focus();
+      this.easyMDE.codemirror.setCursor(this.easyMDE.codemirror.lineCount(), 0);
+    }
+  }
+
+  indentSelection(unindent) {
+    // Indent with 4 spaces, unindent 4 spaces or fewer or a lost tab.
+    const indentPrefix = '    ';
+    const unindentRegex = /^( {1,4}|\t)/;
+
+    // Indent all lines that are included in the selection, partially or whole, while preserving the original selection at the end.
+    const lines = this.textarea.value.split('\n');
+    const changedLines = [];
+    // The current selection or cursor position.
+    const [start, end] = [this.textarea.selectionStart, this.textarea.selectionEnd];
+    // The range containing whole lines that will effectively be replaced.
+    let [editStart, editEnd] = [start, end];
+    // The range that needs to be re-selected to match previous selection.
+    let [newStart, newEnd] = [start, end];
+    // The start and end position of the current line (where end points to the newline or EOF)
+    let [lineStart, lineEnd] = [0, 0];
+
+    for (const line of lines) {
+      lineEnd = lineStart + line.length + 1;
+      if (lineEnd <= start) {
+        lineStart = lineEnd;
+        continue;
+      }
+
+      const updated = unindent ? line.replace(unindentRegex, '') : indentPrefix + line;
+      changedLines.push(updated);
+      const move = updated.length - line.length;
+
+      if (start >= lineStart && start < lineEnd) {
+        editStart = lineStart;
+        newStart = Math.max(start + move, lineStart);
+      }
+
+      newEnd += move;
+      editEnd = lineEnd - 1;
+      lineStart = lineEnd;
+      if (lineStart > end) break;
+    }
+
+    // Update changed lines whole.
+    const text = changedLines.join('\n');
+    this.textarea.focus();
+    this.textarea.setSelectionRange(editStart, editEnd);
+    if (!document.execCommand('insertText', false, text)) {
+      // execCommand is deprecated, but setRangeText (and any other direct value modifications) erases the native undo history.
+      // So only fall back to it if execCommand fails.
+      this.textarea.setRangeText(text);
+    }
+
+    // Set selection to (effectively) be the same as before.
+    this.textarea.setSelectionRange(newStart, Math.max(newStart, newEnd));
+  }
+
+  breakLine() {
+    const [start, end] = [this.textarea.selectionStart, this.textarea.selectionEnd];
+
+    // Do nothing if a range is selected
+    if (start !== end) return false;
+
+    const value = this.textarea.value;
+    // Find the beginning of the current line.
+    const lineStart = Math.max(0, value.lastIndexOf('\n', start - 1) + 1);
+    // Find the end and extract the line.
+    const lineEnd = value.indexOf('\n', start);
+    const line = value.slice(lineStart, lineEnd < 0 ? value.length : lineEnd);
+    // Match any whitespace at the start + any repeatable prefix + exactly one space after.
+    const prefix = line.match(/^\s*((\d+)[.)]\s|[-*+]\s+(\[[ x]\]\s?)?|(>\s+)+)?/);
+
+    // Defer to browser if we can't do anything more useful, or if the cursor is inside the prefix.
+    if (!prefix || !prefix[0].length || lineStart + prefix[0].length > start) return false;
+
+    // Insert newline + prefix.
+    let text = `\n${prefix[0]}`;
+    // Increment a number if present. (perhaps detecting repeating 1. and not doing that then would be a good idea)
+    const num = text.match(/\d+/);
+    if (num) text = text.replace(num[0], Number(num[0]) + 1);
+    text = text.replace('[x]', '[ ]');
+
+    if (!document.execCommand('insertText', false, text)) {
+      this.textarea.setRangeText(text);
+    }
+
+    return true;
+  }
+
+  get userPreferredEditor() {
+    return window.localStorage.getItem(`markdown-editor-${this.options.useScene ?? 'default'}`);
+  }
+  set userPreferredEditor(s) {
+    window.localStorage.setItem(`markdown-editor-${this.options.useScene ?? 'default'}`, s);
+  }
+}
+
+export function getComboMarkdownEditor(el) {
+  if (el instanceof $) el = el[0];
+  return el?._giteaComboMarkdownEditor;
+}
+
+export async function initComboMarkdownEditor(container, options = {}) {
+  if (container instanceof $) {
+    if (container.length !== 1) {
+      throw new Error('initComboMarkdownEditor: container must be a single element');
+    }
+    container = container[0];
+  }
+  if (!container) {
+    throw new Error('initComboMarkdownEditor: container is null');
+  }
+  const editor = new ComboMarkdownEditor(container, options);
+  await editor.init();
+  return editor;
+}
diff --git a/web_src/js/features/comp/ConfirmModal.js b/web_src/js/features/comp/ConfirmModal.js
new file mode 100644
index 00000000..e64996a3
--- /dev/null
+++ b/web_src/js/features/comp/ConfirmModal.js
@@ -0,0 +1,30 @@
+import $ from 'jquery';
+import {svg} from '../../svg.js';
+import {htmlEscape} from 'escape-goat';
+
+const {i18n} = window.config;
+
+export async function confirmModal(opts = {content: '', buttonColor: 'primary'}) {
+  return new Promise((resolve) => {
+    const $modal = $(`
+<div class="ui g-modal-confirm modal">
+  <div class="content">${htmlEscape(opts.content)}</div>
+  <div class="actions">
+    <button class="ui cancel button">${svg('octicon-x')} ${i18n.modal_cancel}</button>
+    <button class="ui ${opts.buttonColor || 'primary'} ok button">${svg('octicon-check')} ${i18n.modal_confirm}</button>
+  </div>
+</div>
+`);
+
+    $modal.appendTo(document.body);
+    $modal.modal({
+      onApprove() {
+        resolve(true);
+      },
+      onHidden() {
+        $modal.remove();
+        resolve(false);
+      },
+    }).modal('show');
+  });
+}
diff --git a/web_src/js/features/comp/EasyMDEToolbarActions.js b/web_src/js/features/comp/EasyMDEToolbarActions.js
new file mode 100644
index 00000000..35abb877
--- /dev/null
+++ b/web_src/js/features/comp/EasyMDEToolbarActions.js
@@ -0,0 +1,152 @@
+import {svg} from '../../svg.js';
+
+export function easyMDEToolbarActions(EasyMDE, editor) {
+  const actions = {
+    '|': '|',
+    'heading-1': {
+      action: EasyMDE.toggleHeading1,
+      icon: svg('octicon-heading'),
+      title: 'Heading 1',
+    },
+    'heading-2': {
+      action: EasyMDE.toggleHeading2,
+      icon: svg('octicon-heading'),
+      title: 'Heading 2',
+    },
+    'heading-3': {
+      action: EasyMDE.toggleHeading3,
+      icon: svg('octicon-heading'),
+      title: 'Heading 3',
+    },
+    'heading-smaller': {
+      action: EasyMDE.toggleHeadingSmaller,
+      icon: svg('octicon-heading'),
+      title: 'Decrease Heading',
+    },
+    'heading-bigger': {
+      action: EasyMDE.toggleHeadingBigger,
+      icon: svg('octicon-heading'),
+      title: 'Increase Heading',
+    },
+    'bold': {
+      action: EasyMDE.toggleBold,
+      icon: svg('octicon-bold'),
+      title: 'Bold',
+    },
+    'italic': {
+      action: EasyMDE.toggleItalic,
+      icon: svg('octicon-italic'),
+      title: 'Italic',
+    },
+    'strikethrough': {
+      action: EasyMDE.toggleStrikethrough,
+      icon: svg('octicon-strikethrough'),
+      title: 'Strikethrough',
+    },
+    'quote': {
+      action: EasyMDE.toggleBlockquote,
+      icon: svg('octicon-quote'),
+      title: 'Quote',
+    },
+    'code': {
+      action: EasyMDE.toggleCodeBlock,
+      icon: svg('octicon-code'),
+      title: 'Code',
+    },
+    'link': {
+      action: EasyMDE.drawLink,
+      icon: svg('octicon-link'),
+      title: 'Link',
+    },
+    'unordered-list': {
+      action: EasyMDE.toggleUnorderedList,
+      icon: svg('octicon-list-unordered'),
+      title: 'Unordered List',
+    },
+    'ordered-list': {
+      action: EasyMDE.toggleOrderedList,
+      icon: svg('octicon-list-ordered'),
+      title: 'Ordered List',
+    },
+    'image': {
+      action: EasyMDE.drawImage,
+      icon: svg('octicon-image'),
+      title: 'Image',
+    },
+    'table': {
+      action: EasyMDE.drawTable,
+      icon: svg('octicon-table'),
+      title: 'Table',
+    },
+    'horizontal-rule': {
+      action: EasyMDE.drawHorizontalRule,
+      icon: svg('octicon-horizontal-rule'),
+      title: 'Horizontal Rule',
+    },
+    'preview': {
+      action: EasyMDE.togglePreview,
+      icon: svg('octicon-eye'),
+      title: 'Preview',
+    },
+    'fullscreen': {
+      action: EasyMDE.toggleFullScreen,
+      icon: svg('octicon-screen-full'),
+      title: 'Fullscreen',
+    },
+    'side-by-side': {
+      action: EasyMDE.toggleSideBySide,
+      icon: svg('octicon-columns'),
+      title: 'Side by Side',
+    },
+
+    // Forgejo custom actions
+    'gitea-checkbox-empty': {
+      action(e) {
+        const cm = e.codemirror;
+        cm.replaceSelection(`\n- [ ] ${cm.getSelection()}`);
+        cm.focus();
+      },
+      icon: svg('gitea-empty-checkbox'),
+      title: 'Add Checkbox (empty)',
+    },
+    'gitea-checkbox-checked': {
+      action(e) {
+        const cm = e.codemirror;
+        cm.replaceSelection(`\n- [x] ${cm.getSelection()}`);
+        cm.focus();
+      },
+      icon: svg('octicon-checkbox'),
+      title: 'Add Checkbox (checked)',
+    },
+    'gitea-switch-to-textarea': {
+      action: () => {
+        editor.userPreferredEditor = 'textarea';
+        editor.switchToTextarea();
+      },
+      icon: svg('octicon-arrow-switch'),
+      title: 'Revert to simple textarea',
+    },
+    'gitea-code-inline': {
+      action(e) {
+        const cm = e.codemirror;
+        const selection = cm.getSelection();
+        cm.replaceSelection(`\`${selection}\``);
+        if (!selection) {
+          const cursorPos = cm.getCursor();
+          cm.setCursor(cursorPos.line, cursorPos.ch - 1);
+        }
+        cm.focus();
+      },
+      icon: svg('octicon-chevron-right'),
+      title: 'Add Inline Code',
+    },
+  };
+
+  for (const [key, value] of Object.entries(actions)) {
+    if (typeof value !== 'string') {
+      value.name = key;
+    }
+  }
+
+  return actions;
+}
diff --git a/web_src/js/features/comp/LabelEdit.js b/web_src/js/features/comp/LabelEdit.js
new file mode 100644
index 00000000..2cc75cc6
--- /dev/null
+++ b/web_src/js/features/comp/LabelEdit.js
@@ -0,0 +1,96 @@
+import $ from 'jquery';
+
+function isExclusiveScopeName(name) {
+  return /.*[^/]\/[^/].*/.test(name);
+}
+
+function updateExclusiveLabelEdit(form) {
+  const nameInput = document.querySelector(`${form} .label-name-input`);
+  const exclusiveField = document.querySelector(`${form} .label-exclusive-input-field`);
+  const exclusiveCheckbox = document.querySelector(`${form} .label-exclusive-input`);
+  const exclusiveWarning = document.querySelector(`${form} .label-exclusive-warning`);
+
+  if (isExclusiveScopeName(nameInput.value)) {
+    exclusiveField?.classList.remove('muted');
+    exclusiveField?.removeAttribute('aria-disabled');
+    if (exclusiveCheckbox.checked && exclusiveCheckbox.getAttribute('data-exclusive-warn')) {
+      exclusiveWarning?.classList.remove('tw-hidden');
+    } else {
+      exclusiveWarning?.classList.add('tw-hidden');
+    }
+  } else {
+    exclusiveField?.classList.add('muted');
+    exclusiveField?.setAttribute('aria-disabled', 'true');
+    exclusiveWarning?.classList.add('tw-hidden');
+  }
+}
+
+export function initCompLabelEdit(selector) {
+  if (!$(selector).length) return;
+
+  // Create label
+  $('.new-label.button').on('click', () => {
+    updateExclusiveLabelEdit('.new-label');
+    $('.new-label.modal').modal({
+      onApprove() {
+        const form = document.querySelector('.new-label.form');
+        if (!form.checkValidity()) {
+          form.reportValidity();
+          return false;
+        }
+        $('.new-label.form').trigger('submit');
+      },
+    }).modal('show');
+    return false;
+  });
+
+  // Edit label
+  $('.edit-label-button').on('click', function () {
+    $('#label-modal-id').val($(this).data('id'));
+
+    const $nameInput = $('.edit-label .label-name-input');
+    $nameInput.val($(this).data('title'));
+
+    const $isArchivedCheckbox = $('.edit-label .label-is-archived-input');
+    $isArchivedCheckbox[0].checked = this.hasAttribute('data-is-archived');
+
+    const $exclusiveCheckbox = $('.edit-label .label-exclusive-input');
+    $exclusiveCheckbox[0].checked = this.hasAttribute('data-exclusive');
+    // Warn when label was previously not exclusive and used in issues
+    $exclusiveCheckbox.data('exclusive-warn',
+      $(this).data('num-issues') > 0 &&
+      (!this.hasAttribute('data-exclusive') || !isExclusiveScopeName($nameInput.val())));
+    updateExclusiveLabelEdit('.edit-label');
+
+    $('.edit-label .label-desc-input').val(this.getAttribute('data-description'));
+
+    const colorInput = document.querySelector('.edit-label .js-color-picker-input input');
+    colorInput.value = this.getAttribute('data-color');
+    colorInput.dispatchEvent(new Event('input', {bubbles: true}));
+
+    $('.edit-label.modal').modal({
+      onApprove() {
+        const form = document.querySelector('.edit-label.form');
+        if (!form.checkValidity()) {
+          form.reportValidity();
+          return false;
+        }
+        $('.edit-label.form').trigger('submit');
+      },
+    }).modal('show');
+    return false;
+  });
+
+  $('.new-label .label-name-input').on('input', () => {
+    updateExclusiveLabelEdit('.new-label');
+  });
+  $('.new-label .label-exclusive-input').on('change', () => {
+    updateExclusiveLabelEdit('.new-label');
+  });
+  $('.edit-label .label-name-input').on('input', () => {
+    updateExclusiveLabelEdit('.edit-label');
+  });
+  $('.edit-label .label-exclusive-input').on('change', () => {
+    updateExclusiveLabelEdit('.edit-label');
+  });
+}
diff --git a/web_src/js/features/comp/Paste.js b/web_src/js/features/comp/Paste.js
new file mode 100644
index 00000000..aab6997a
--- /dev/null
+++ b/web_src/js/features/comp/Paste.js
@@ -0,0 +1,144 @@
+import {POST} from '../../modules/fetch.js';
+import {getPastedContent, replaceTextareaSelection} from '../../utils/dom.js';
+import {isUrl} from '../../utils/url.js';
+
+async function uploadFile(file, uploadUrl) {
+  const formData = new FormData();
+  formData.append('file', file, file.name);
+
+  const res = await POST(uploadUrl, {data: formData});
+  return await res.json();
+}
+
+function triggerEditorContentChanged(target) {
+  target.dispatchEvent(new CustomEvent('ce-editor-content-changed', {bubbles: true}));
+}
+
+class TextareaEditor {
+  constructor(editor) {
+    this.editor = editor;
+  }
+
+  insertPlaceholder(value) {
+    const editor = this.editor;
+    const startPos = editor.selectionStart;
+    const endPos = editor.selectionEnd;
+    editor.value = editor.value.substring(0, startPos) + value + editor.value.substring(endPos);
+    editor.selectionStart = startPos;
+    editor.selectionEnd = startPos + value.length;
+    editor.focus();
+    triggerEditorContentChanged(editor);
+  }
+
+  replacePlaceholder(oldVal, newVal) {
+    const editor = this.editor;
+    const startPos = editor.selectionStart;
+    const endPos = editor.selectionEnd;
+    if (editor.value.substring(startPos, endPos) === oldVal) {
+      editor.value = editor.value.substring(0, startPos) + newVal + editor.value.substring(endPos);
+      editor.selectionEnd = startPos + newVal.length;
+    } else {
+      editor.value = editor.value.replace(oldVal, newVal);
+      editor.selectionEnd -= oldVal.length;
+      editor.selectionEnd += newVal.length;
+    }
+    editor.selectionStart = editor.selectionEnd;
+    editor.focus();
+    triggerEditorContentChanged(editor);
+  }
+}
+
+class CodeMirrorEditor {
+  constructor(editor) {
+    this.editor = editor;
+  }
+
+  insertPlaceholder(value) {
+    const editor = this.editor;
+    const startPoint = editor.getCursor('start');
+    const endPoint = editor.getCursor('end');
+    editor.replaceSelection(value);
+    endPoint.ch = startPoint.ch + value.length;
+    editor.setSelection(startPoint, endPoint);
+    editor.focus();
+    triggerEditorContentChanged(editor.getTextArea());
+  }
+
+  replacePlaceholder(oldVal, newVal) {
+    const editor = this.editor;
+    const endPoint = editor.getCursor('end');
+    if (editor.getSelection() === oldVal) {
+      editor.replaceSelection(newVal);
+    } else {
+      editor.setValue(editor.getValue().replace(oldVal, newVal));
+    }
+    endPoint.ch -= oldVal.length;
+    endPoint.ch += newVal.length;
+    editor.setSelection(endPoint, endPoint);
+    editor.focus();
+    triggerEditorContentChanged(editor.getTextArea());
+  }
+}
+
+async function handleClipboardImages(editor, dropzone, images, e) {
+  const uploadUrl = dropzone.getAttribute('data-upload-url');
+  const filesContainer = dropzone.querySelector('.files');
+
+  if (!dropzone || !uploadUrl || !filesContainer || !images.length) return;
+
+  e.preventDefault();
+  e.stopPropagation();
+
+  for (const img of images) {
+    const name = img.name.slice(0, img.name.lastIndexOf('.'));
+
+    const placeholder = `![${name}](uploading ...)`;
+    editor.insertPlaceholder(placeholder);
+
+    const {uuid} = await uploadFile(img, uploadUrl);
+
+    const url = `/attachments/${uuid}`;
+    const text = `![${name}](${url})`;
+    editor.replacePlaceholder(placeholder, text);
+
+    const input = document.createElement('input');
+    input.setAttribute('name', 'files');
+    input.setAttribute('type', 'hidden');
+    input.setAttribute('id', uuid);
+    input.value = uuid;
+    filesContainer.append(input);
+  }
+}
+
+function handleClipboardText(textarea, text, e) {
+  // when pasting links over selected text, turn it into [text](link), except when shift key is held
+  const {value, selectionStart, selectionEnd, _shiftDown} = textarea;
+  if (_shiftDown) return;
+  const selectedText = value.substring(selectionStart, selectionEnd);
+  const trimmedText = text.trim();
+  if (selectedText && isUrl(trimmedText)) {
+    e.stopPropagation();
+    e.preventDefault();
+    replaceTextareaSelection(textarea, `[${selectedText}](${trimmedText})`);
+  }
+}
+
+export function initEasyMDEPaste(easyMDE, dropzone) {
+  easyMDE.codemirror.on('paste', (_, e) => {
+    const {images} = getPastedContent(e);
+    if (images.length) {
+      handleClipboardImages(new CodeMirrorEditor(easyMDE.codemirror), dropzone, images, e);
+    }
+  });
+}
+
+export function initTextareaPaste(textarea, dropzone) {
+  textarea.addEventListener('paste', (e) => {
+    const {images, text} = getPastedContent(e);
+    if (images.length) {
+      handleClipboardImages(new TextareaEditor(textarea), dropzone, images, e);
+    } else if (text) {
+      handleClipboardText(textarea, text, e);
+    }
+  });
+}
diff --git a/web_src/js/features/comp/QuickSubmit.js b/web_src/js/features/comp/QuickSubmit.js
new file mode 100644
index 00000000..e6d7080b
--- /dev/null
+++ b/web_src/js/features/comp/QuickSubmit.js
@@ -0,0 +1,17 @@
+export function handleGlobalEnterQuickSubmit(target) {
+  const form = target.closest('form');
+  if (form) {
+    if (!form.checkValidity()) {
+      form.reportValidity();
+      return;
+    }
+
+    // here use the event to trigger the submit event (instead of calling `submit()` method directly)
+    // otherwise the `areYouSure` handler won't be executed, then there will be an annoying "confirm to leave" dialog
+    form.dispatchEvent(new SubmitEvent('submit', {bubbles: true, cancelable: true}));
+  } else {
+    // if no form, then the editor is for an AJAX request, dispatch an event to the target, let the target's event handler to do the AJAX request.
+    // the 'ce-' prefix means this is a CustomEvent
+    target.dispatchEvent(new CustomEvent('ce-quick-submit', {bubbles: true}));
+  }
+}
diff --git a/web_src/js/features/comp/ReactionSelector.js b/web_src/js/features/comp/ReactionSelector.js
new file mode 100644
index 00000000..fd4601fb
--- /dev/null
+++ b/web_src/js/features/comp/ReactionSelector.js
@@ -0,0 +1,38 @@
+import $ from 'jquery';
+import {POST} from '../../modules/fetch.js';
+
+export function initCompReactionSelector($parent) {
+  $parent.find(`.select-reaction .item.reaction, .comment-reaction-button`).on('click', async function (e) {
+    e.preventDefault();
+
+    if (this.classList.contains('disabled')) return;
+
+    const actionUrl = this.closest('[data-action-url]')?.getAttribute('data-action-url');
+    const reactionContent = this.getAttribute('data-reaction-content');
+    const hasReacted = this.closest('.comment')?.querySelector(`.ui.segment.reactions a[data-reaction-content="${reactionContent}"]`)?.getAttribute('data-has-reacted') === 'true';
+
+    const res = await POST(`${actionUrl}/${hasReacted ? 'unreact' : 'react'}`, {
+      data: new URLSearchParams({content: reactionContent}),
+    });
+
+    const data = await res.json();
+    if (data && (data.html || data.empty)) {
+      const $content = $(this).closest('.content');
+      let $react = $content.find('.segment.reactions');
+      if ((!data.empty || data.html === '') && $react.length > 0) {
+        $react.remove();
+      }
+      if (!data.empty) {
+        const $attachments = $content.find('.segment.bottom:first');
+        $react = $(data.html);
+        if ($attachments.length > 0) {
+          $react.insertBefore($attachments);
+        } else {
+          $react.appendTo($content);
+        }
+        $react.find('.dropdown').dropdown();
+        initCompReactionSelector($react);
+      }
+    }
+  });
+}
diff --git a/web_src/js/features/comp/SearchUserBox.js b/web_src/js/features/comp/SearchUserBox.js
new file mode 100644
index 00000000..081c4742
--- /dev/null
+++ b/web_src/js/features/comp/SearchUserBox.js
@@ -0,0 +1,51 @@
+import $ from 'jquery';
+import {htmlEscape} from 'escape-goat';
+
+const {appSubUrl} = window.config;
+const looksLikeEmailAddressCheck = /^\S+@\S+$/;
+
+export function initCompSearchUserBox() {
+  const searchUserBox = document.getElementById('search-user-box');
+  if (!searchUserBox) return;
+
+  const $searchUserBox = $(searchUserBox);
+  const allowEmailInput = searchUserBox.getAttribute('data-allow-email') === 'true';
+  const allowEmailDescription = searchUserBox.getAttribute('data-allow-email-description') ?? undefined;
+  $searchUserBox.search({
+    minCharacters: 2,
+    apiSettings: {
+      url: `${appSubUrl}/user/search?active=1&q={query}`,
+      onResponse(response) {
+        const items = [];
+        const searchQuery = $searchUserBox.find('input').val();
+        const searchQueryUppercase = searchQuery.toUpperCase();
+        $.each(response.data, (_i, item) => {
+          const resultItem = {
+            title: item.login,
+            image: item.avatar_url,
+          };
+          if (item.full_name) {
+            resultItem.description = htmlEscape(item.full_name);
+          }
+          if (searchQueryUppercase === item.login.toUpperCase()) {
+            items.unshift(resultItem);
+          } else {
+            items.push(resultItem);
+          }
+        });
+
+        if (allowEmailInput && !items.length && looksLikeEmailAddressCheck.test(searchQuery)) {
+          const resultItem = {
+            title: searchQuery,
+            description: allowEmailDescription,
+          };
+          items.push(resultItem);
+        }
+
+        return {results: items};
+      },
+    },
+    searchFields: ['login', 'full_name'],
+    showNoResults: false,
+  });
+}
diff --git a/web_src/js/features/comp/TextExpander.js b/web_src/js/features/comp/TextExpander.js
new file mode 100644
index 00000000..128a2ddf
--- /dev/null
+++ b/web_src/js/features/comp/TextExpander.js
@@ -0,0 +1,61 @@
+import {matchEmoji, matchMention} from '../../utils/match.js';
+import {emojiString} from '../emoji.js';
+
+export function initTextExpander(expander) {
+  expander?.addEventListener('text-expander-change', ({detail: {key, provide, text}}) => {
+    if (key === ':') {
+      const matches = matchEmoji(text);
+      if (!matches.length) return provide({matched: false});
+
+      const ul = document.createElement('ul');
+      ul.classList.add('suggestions');
+      for (const name of matches) {
+        const emoji = emojiString(name);
+        const li = document.createElement('li');
+        li.setAttribute('role', 'option');
+        li.setAttribute('data-value', emoji);
+        li.textContent = `${emoji} ${name}`;
+        ul.append(li);
+      }
+
+      provide({matched: true, fragment: ul});
+    } else if (key === '@') {
+      const matches = matchMention(text);
+      if (!matches.length) return provide({matched: false});
+
+      const ul = document.createElement('ul');
+      ul.classList.add('suggestions');
+      for (const {value, name, fullname, avatar} of matches) {
+        const li = document.createElement('li');
+        li.setAttribute('role', 'option');
+        li.setAttribute('data-value', `${key}${value}`);
+
+        const img = document.createElement('img');
+        img.src = avatar;
+        li.append(img);
+
+        const nameSpan = document.createElement('span');
+        nameSpan.textContent = name;
+        li.append(nameSpan);
+
+        if (fullname && fullname.toLowerCase() !== name) {
+          const fullnameSpan = document.createElement('span');
+          fullnameSpan.classList.add('fullname');
+          fullnameSpan.textContent = fullname;
+          li.append(fullnameSpan);
+        }
+
+        ul.append(li);
+      }
+
+      provide({matched: true, fragment: ul});
+    }
+  });
+  expander?.addEventListener('text-expander-value', ({detail}) => {
+    if (detail?.item) {
+      // add a space after @mentions as it's likely the user wants one
+      const suffix = detail.key === '@' ? ' ' : '';
+      detail.value = `${detail.item.getAttribute('data-value')}${suffix}`;
+    }
+  });
+}
diff --git a/web_src/js/features/comp/WebHookEditor.js b/web_src/js/features/comp/WebHookEditor.js
new file mode 100644
index 00000000..d74b59fd
--- /dev/null
+++ b/web_src/js/features/comp/WebHookEditor.js
@@ -0,0 +1,44 @@
+import {POST} from '../../modules/fetch.js';
+import {hideElem, showElem, toggleElem} from '../../utils/dom.js';
+
+export function initCompWebHookEditor() {
+  if (!document.querySelectorAll('.new.webhook').length) {
+    return;
+  }
+
+  for (const input of document.querySelectorAll('.events.checkbox input')) {
+    input.addEventListener('change', function () {
+      if (this.checked) {
+        showElem('.events.fields');
+      }
+    });
+  }
+
+  for (const input of document.querySelectorAll('.non-events.checkbox input')) {
+    input.addEventListener('change', function () {
+      if (this.checked) {
+        hideElem('.events.fields');
+      }
+    });
+  }
+
+  // some webhooks (like Gitea) allow to set the request method (GET/POST), and it would toggle the "Content Type" field
+  const httpMethodInput = document.getElementById('http_method');
+  if (httpMethodInput) {
+    const updateContentType = function () {
+      const visible = httpMethodInput.value === 'POST';
+      toggleElem(document.getElementById('content_type').closest('.field'), visible);
+    };
+    updateContentType();
+    httpMethodInput.addEventListener('change', updateContentType);
+  }
+
+  // Test delivery
+  document.getElementById('test-delivery')?.addEventListener('click', async function () {
+    this.classList.add('is-loading', 'disabled');
+    await POST(this.getAttribute('data-link'));
+    setTimeout(() => {
+      window.location.href = this.getAttribute('data-redirect');
+    }, 5000);
+  });
+}