WIP

apps/client/src/features/editor/components/slash-menu/menu-items.ts

@@ -20,6 +20,7 @@ import {
   IconCalendar,
   IconAppWindow,
   IconSitemap,
+  IconLayoutColumns,
 } from "@tabler/icons-react";
 import {
   CommandProps,
@@ -243,6 +244,51 @@ const CommandGroups: SlashMenuGroupedItemsType = {
           .insertTable({ rows: 3, cols: 3, withHeaderRow: true })
           .run(),
     },
+    {
+      title: "Columns",
+      description: "Insert 2 columns layout.",
+      searchTerms: ["columns", "layout", "grid", "side by side"],
+      icon: IconLayoutColumns,
+      command: ({ editor, range }: CommandProps) => {
+        editor
+          .chain()
+          .focus()
+          .deleteRange(range)
+          .insertContent({
+            type: "column_container",
+            content: [
+              {
+                type: "column",
+                attrs: { colWidth: 200 },
+                content: [
+                  {
+                    type: "paragraph",
+                  },
+                ],
+              },
+              {
+                type: "column",
+                attrs: { colWidth: 200 },
+                content: [
+                  {
+                    type: "paragraph",
+                  },
+                ],
+              },
+              {
+                type: "column",
+                attrs: { colWidth: 200 },
+                content: [
+                  {
+                    type: "paragraph",
+                  },
+                ],
+              },
+            ],
+          })
+          .run();
+      },
+    },
     {
       title: "Toggle block",
       description: "Insert collapsible block.",

apps/client/src/features/editor/extensions/extensions.ts

@@ -46,6 +46,7 @@ import {
   Heading,
   Highlight,
   UniqueID,
+  ColumnsExtension,
 } from "@docmost/editor-ext";
 import {
   randomElement,
@@ -229,6 +230,7 @@ export const mainExtensions = [
   Subpages.configure({
     view: SubpagesView,
   }),
+  ColumnsExtension,
   MarkdownClipboard.configure({
     transformPastedText: true,
   }),

apps/client/src/features/editor/styles/column.css

@@ -0,0 +1,123 @@
+.resize-cursor {
+    cursor: col-resize;
+}
+
+.prosemirror-column-container {
+    display: flex;
+    flex-direction: row;
+    width: calc(100% - 8px);
+    gap: 12px;
+    margin: 16px 0;
+}
+
+.prosemirror-column-container.has-focus .prosemirror-column,
+.prosemirror-column-container:hover .prosemirror-column {
+    background-color: rgba(100, 106, 115, 0.05);
+}
+
+.prosemirror-column-container .prosemirror-column {
+    position: relative;
+    border-radius: 8px;
+    min-width: 50px;
+    padding: 12px;
+    background-color: transparent;
+    transition: background-color 0.2s ease;
+}
+
+.prosemirror-column-container
+.prosemirror-column
+> :not(div.grid-resize-handle):nth-child(1),
+.prosemirror-column-container
+.prosemirror-column
+> div.grid-resize-handle
++ :nth-child(2) {
+    margin-top: 0;
+}
+
+.prosemirror-column-container .prosemirror-column > :nth-last-child(1) {
+    margin-bottom: 0;
+}
+
+.prosemirror-column-container .prosemirror-column .grid-resize-handle {
+    position: absolute;
+    right: -7px;
+    top: 0;
+    bottom: 0;
+    width: 2px;
+    z-index: 20;
+    background-color: #336df4;
+    pointer-events: none;
+}
+
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button {
+    top: -8px;
+    left: -9px;
+    width: 12px;
+    height: 12px;
+    background-color: #007bff;
+    border: 4px solid white;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    position: relative;
+    pointer-events: auto;
+    cursor: pointer;
+    transition: transform 0.1s ease-in-out;
+}
+
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button:hover {
+    transform: scale(1.35);
+}
+
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button
+.plus {
+    position: relative;
+    width: 8px;
+    height: 8px;
+}
+
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button
+.plus::before,
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button
+.plus::after {
+    content: '';
+    position: absolute;
+    background-color: white;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+}
+
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button
+.plus::before {
+    width: 8px;
+    height: 2px;
+}
+
+.prosemirror-column-container
+.prosemirror-column
+.grid-resize-handle
+.circle-button
+.plus::after {
+    width: 24px;
+    height: 8px;
+}

apps/client/src/features/editor/styles/index.css

@@ -13,3 +13,4 @@
 @import "./mention.css";
 @import "./ordered-list.css";
 @import "./highlight.css";
+@import "./column.css";

apps/server/src/collaboration/collaboration.util.ts

@@ -35,6 +35,7 @@ import {
   Subpages,
   Highlight,
   UniqueID,
+  ColumnsExtension,
   addUniqueIdsToDoc,
 } from '@docmost/editor-ext';
 import { generateText, getSchema, JSONContent } from '@tiptap/core';
@@ -88,6 +89,7 @@ export const tiptapExtensions = [
   Embed,
   Mention,
   Subpages,
+  ColumnsExtension
 ] as any;
 
 export function jsonToHtml(tiptapJson: any) {

apps/server/src/database/migrations/20260111T163516-add-new-indexes.ts

@@ -1,196 +0,0 @@
-import { type Kysely, sql } from 'kysely';
-
-export async function up(db: Kysely<any>): Promise<void> {
-  await db.schema
-    .createIndex('idx_group_users_user_id')
-    .ifNotExists()
-    .on('group_users')
-    .column('user_id')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_space_members_user_id')
-    .ifNotExists()
-    .on('space_members')
-    .column('user_id')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_space_members_group_id')
-    .ifNotExists()
-    .on('space_members')
-    .column('group_id')
-    .execute();
-
-  // Page tree
-  await sql`
-    CREATE INDEX IF NOT EXISTS idx_pages_space_parent_position
-    ON pages (space_id, parent_page_id, position COLLATE "C")
-    WHERE deleted_at IS NULL
-  `.execute(db);
-
-  await sql`
-    CREATE INDEX IF NOT EXISTS idx_pages_parent_page_id
-    ON pages (parent_page_id)
-    WHERE deleted_at IS NULL
-  `.execute(db);
-
-  // Recent pages query
-  await sql`
-    CREATE INDEX IF NOT EXISTS idx_pages_space_updated
-    ON pages (space_id, updated_at DESC)
-    WHERE deleted_at IS NULL
-  `.execute(db);
-
-  // Trash view
-  await sql`
-    CREATE INDEX IF NOT EXISTS idx_pages_space_deleted
-    ON pages (space_id, deleted_at DESC)
-    WHERE deleted_at IS NOT NULL
-  `.execute(db);
-
-  await sql`
-    CREATE UNIQUE INDEX IF NOT EXISTS idx_workspaces_hostname_lower
-    ON workspaces (LOWER(hostname))
-  `.execute(db);
-
-  await db.schema
-    .createIndex('idx_workspaces_created_at')
-    .ifNotExists()
-    .on('workspaces')
-    .column('created_at')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_users_workspace_deleted_created')
-    .ifNotExists()
-    .on('users')
-    .columns(['workspace_id', 'deleted_at', 'created_at'])
-    .execute();
-
-  await sql`
-    CREATE INDEX IF NOT EXISTS idx_users_workspace_email_lower
-    ON users (workspace_id, LOWER(email))
-  `.execute(db);
-
-  await sql`
-    CREATE UNIQUE INDEX IF NOT EXISTS idx_spaces_workspace_slug_lower
-    ON spaces (workspace_id, LOWER(slug))
-  `.execute(db);
-
-  await db.schema
-    .createIndex('idx_spaces_workspace_created')
-    .ifNotExists()
-    .on('spaces')
-    .columns(['workspace_id', 'created_at'])
-    .execute();
-
-  await sql`
-    CREATE UNIQUE INDEX IF NOT EXISTS idx_groups_workspace_name_lower
-    ON groups (workspace_id, LOWER(name))
-  `.execute(db);
-
-  await db.schema
-    .createIndex('idx_groups_workspace_id')
-    .ifNotExists()
-    .on('groups')
-    .column('workspace_id')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_shares_page_id')
-    .ifNotExists()
-    .on('shares')
-    .column('page_id')
-    .execute();
-
-  await sql`
-    CREATE UNIQUE INDEX IF NOT EXISTS idx_shares_key_lower
-    ON shares (LOWER(key))
-  `.execute(db);
-
-  await db.schema
-    .createIndex('idx_attachments_page_id')
-    .ifNotExists()
-    .on('attachments')
-    .column('page_id')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_attachments_space_id')
-    .ifNotExists()
-    .on('attachments')
-    .column('space_id')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_comments_page_id')
-    .ifNotExists()
-    .on('comments')
-    .columns(['page_id', 'created_at'])
-    .execute();
-
-  await db.schema
-    .createIndex('idx_comments_parent_comment_id')
-    .ifNotExists()
-    .on('comments')
-    .column('parent_comment_id')
-    .execute();
-
-  await sql`
-    CREATE INDEX IF NOT EXISTS idx_page_history_page_created
-    ON page_history (page_id, created_at DESC)
-  `.execute(db);
-}
-
-export async function down(db: Kysely<any>): Promise<void> {
-  await db.schema.dropIndex('idx_group_users_user_id').ifExists().execute();
-  await db.schema.dropIndex('idx_space_members_user_id').ifExists().execute();
-  await db.schema.dropIndex('idx_space_members_group_id').ifExists().execute();
-  await db.schema
-    .dropIndex('idx_pages_space_parent_position')
-    .ifExists()
-    .execute();
-  await db.schema.dropIndex('idx_pages_parent_page_id').ifExists().execute();
-  await db.schema.dropIndex('idx_pages_space_updated').ifExists().execute();
-  await db.schema.dropIndex('idx_pages_space_deleted').ifExists().execute();
-  await db.schema
-    .dropIndex('idx_workspaces_hostname_lower')
-    .ifExists()
-    .execute();
-  await db.schema.dropIndex('idx_workspaces_created_at').ifExists().execute();
-  await db.schema
-    .dropIndex('idx_users_workspace_deleted_created')
-    .ifExists()
-    .execute();
-  await db.schema
-    .dropIndex('idx_users_workspace_email_lower')
-    .ifExists()
-    .execute();
-  await db.schema
-    .dropIndex('idx_spaces_workspace_slug_lower')
-    .ifExists()
-    .execute();
-  await db.schema
-    .dropIndex('idx_spaces_workspace_created')
-    .ifExists()
-    .execute();
-  await db.schema
-    .dropIndex('idx_groups_workspace_name_lower')
-    .ifExists()
-    .execute();
-  await db.schema.dropIndex('idx_groups_workspace_id').ifExists().execute();
-  await db.schema.dropIndex('idx_shares_page_id').ifExists().execute();
-  await db.schema.dropIndex('idx_shares_key_lower').ifExists().execute();
-  await db.schema.dropIndex('idx_attachments_page_id').ifExists().execute();
-  await db.schema.dropIndex('idx_attachments_space_id').ifExists().execute();
-  await db.schema.dropIndex('idx_comments_page_id').ifExists().execute();
-  await db.schema
-    .dropIndex('idx_comments_parent_comment_id')
-    .ifExists()
-    .execute();
-  await db.schema
-    .dropIndex('idx_page_history_page_created')
-    .ifExists()
-    .execute();
-}

packages/editor-ext/src/index.ts

@@ -23,3 +23,4 @@ export * from "./lib/subpages";
 export * from "./lib/highlight";
 export * from "./lib/heading/heading";
 export * from "./lib/unique-id";
+export * from "./lib/columns";

packages/editor-ext/src/lib/columns/dom.ts

@@ -0,0 +1,152 @@
+import { EditorState } from '@tiptap/pm/state';
+import { Decoration, DecorationSet, EditorView } from '@tiptap/pm/view';
+import { gridResizingPluginKey } from './state';
+import {
+  draggedWidth,
+  findBoundaryPosition,
+  getColumnInfoAtPos,
+  updateColumnNodeWidth,
+} from './utils';
+
+function updateActiveHandle(view: EditorView, value: number) {
+  view.dispatch(
+    view.state.tr.setMeta(gridResizingPluginKey, {
+      setHandle: value,
+    }),
+  );
+}
+
+export function handleMouseMove(
+  view: EditorView,
+  event: MouseEvent,
+  handleWidth: number,
+): boolean {
+  const pluginState = gridResizingPluginKey.getState(view.state);
+  if (!pluginState) return false;
+
+  // TODO: limit call？
+
+  if (pluginState.dragging) return false;
+
+  const boundaryPos = findBoundaryPosition(view, event, handleWidth);
+  if (boundaryPos !== pluginState.activeHandle) {
+    updateActiveHandle(view, boundaryPos);
+  }
+  return false;
+}
+
+export function handleMouseLeave(view: EditorView) {
+  const pluginState = gridResizingPluginKey.getState(view.state);
+  if (!pluginState) return false;
+  if (pluginState.activeHandle > -1 && !pluginState.dragging) {
+    updateActiveHandle(view, -1);
+  }
+  return false;
+}
+
+export function handleMouseDown(
+  view: EditorView,
+  event: MouseEvent,
+  columnMinWidth: number,
+): boolean {
+  const pluginState = gridResizingPluginKey.getState(view.state);
+  if (!pluginState) return false;
+  if (pluginState.activeHandle === -1) return false;
+  if (pluginState.dragging) return false;
+
+  const columnInfo = getColumnInfoAtPos(view, pluginState.activeHandle);
+  if (!columnInfo) return false;
+
+  const { domWidth, $pos, node } = columnInfo;
+  const nodeAttrs = { ...(node.attrs || {}) };
+  const nodePos = $pos.before();
+
+  view.dispatch(
+    view.state.tr.setMeta(gridResizingPluginKey, {
+      setDragging: { startX: event.clientX, startWidth: domWidth },
+    }),
+  );
+
+  const win = view.dom.ownerDocument.defaultView || window;
+
+  const finish = (e: MouseEvent) => {
+    win.removeEventListener('mouseup', finish);
+    win.removeEventListener('mousemove', move);
+
+    const pluginState = gridResizingPluginKey.getState(view.state);
+    if (!pluginState?.dragging) return;
+
+    const finalWidth = draggedWidth(pluginState.dragging, e, columnMinWidth);
+    updateColumnNodeWidth(view, nodePos, nodeAttrs, finalWidth);
+    view.dispatch(
+      view.state.tr.setMeta(gridResizingPluginKey, {
+        setDragging: null,
+      }),
+    );
+  };
+
+  const move = (e: MouseEvent) => {
+    if (!e.buttons) {
+      finish(e);
+      return;
+    }
+    const pluginState = gridResizingPluginKey.getState(view.state);
+    if (!pluginState?.dragging) return;
+
+    const newWidth = draggedWidth(pluginState.dragging, e, columnMinWidth);
+    updateColumnNodeWidth(view, nodePos, nodeAttrs, newWidth);
+  };
+
+  win.addEventListener('mouseup', finish);
+  win.addEventListener('mousemove', move);
+
+  updateColumnNodeWidth(view, nodePos, nodeAttrs, domWidth);
+
+  event.preventDefault();
+  return true;
+}
+
+export function handleGridDecorations(
+  state: EditorState,
+  boundaryPos: number,
+): DecorationSet {
+  const decorations = [];
+  const $pos = state.doc.resolve(boundaryPos);
+  if ($pos.nodeAfter !== null) {
+    const widget = document.createElement('div');
+    widget.className = 'grid-resize-handle';
+    const circleButton = document.createElement('div');
+    circleButton.className = 'circle-button';
+    widget.appendChild(circleButton);
+    const plusIcon = document.createElement('div');
+    plusIcon.className = 'plus';
+    circleButton.appendChild(plusIcon);
+    decorations.push(Decoration.widget(boundaryPos, widget));
+  }
+  return DecorationSet.create(state.doc, decorations);
+}
+
+export function handleMouseUp(view: EditorView, event: MouseEvent): boolean {
+  const div = event.target as HTMLElement;
+  if (!div) return false;
+  if (div.className !== 'circle-button' && div.className !== 'plus')
+    return false;
+  const column = div.closest('.prosemirror-column');
+  if (!column) return false;
+  const boundryPos = view.posAtDOM(column, 0);
+  if (!boundryPos) return false;
+  const $pos = view.state.doc.resolve(boundryPos);
+  const { state } = view;
+  view.dispatch(
+    state.tr.insert(
+      $pos.pos + $pos.parent.nodeSize - 1,
+      state.schema.nodes.column.create(
+        {
+          colWidth: 100,
+        },
+        state.schema.nodes.paragraph.create(),
+      ),
+    ),
+  );
+  return true;
+}

packages/editor-ext/src/lib/columns/index.ts

@@ -0,0 +1,4 @@
+export * from './schema';
+export * from './resize';
+export * from './keymap';
+export * from './tiptap';

packages/editor-ext/src/lib/columns/keymap.ts

@@ -0,0 +1,63 @@
+import { liftTarget, canSplit } from "@tiptap/pm/transform";
+import { TextSelection, Command } from "@tiptap/pm/state";
+import {
+  splitBlock,
+  chainCommands,
+  newlineInCode,
+  createParagraphNear,
+} from "@tiptap/pm/commands";
+import { keymap } from "@tiptap/pm/keymap";
+import { ResolvedPos } from "@tiptap/pm/model";
+
+function findParentColumn($pos: ResolvedPos) {
+  for (let depth = $pos.depth; depth > 0; depth--) {
+    const node = $pos.node(depth);
+    if (node.type.name === "column") {
+      return { node, depth };
+    }
+  }
+  return null;
+}
+
+export const liftEmptyBlock: Command = (state, dispatch) => {
+  const { $cursor } = state.selection as TextSelection;
+  if (!$cursor || $cursor.parent.content.size) return false;
+  if ("column" === $cursor.node($cursor.depth - 1).type.name) return false;
+  if ($cursor.depth > 1 && $cursor.after() != $cursor.end(-1)) {
+    const before = $cursor.before();
+    if (canSplit(state.doc, before)) {
+      if (dispatch) dispatch(state.tr.split(before).scrollIntoView());
+      return true;
+    }
+  }
+  const range = $cursor.blockRange(),
+    target = range && liftTarget(range);
+  if (target == null) return false;
+  if (dispatch) dispatch(state.tr.lift(range!, target).scrollIntoView());
+  return true;
+};
+
+export const columnsKeymap = keymap({
+  Enter: chainCommands(
+    newlineInCode,
+    createParagraphNear,
+    liftEmptyBlock,
+    splitBlock,
+  ),
+  "Mod-a": (state, dispatch, view) => {
+    const { selection } = state;
+    const { $from } = selection;
+    const found = findParentColumn($from);
+    if (found) {
+      const { depth } = found;
+      const start = $from.start(depth);
+      const end = $from.end(depth);
+      const tr = state.tr.setSelection(
+        TextSelection.create(state.doc, start, end),
+      );
+      if (dispatch) dispatch(tr);
+      return true;
+    }
+    return false;
+  },
+} as { [key: string]: Command });

packages/editor-ext/src/lib/columns/resize.ts

@@ -0,0 +1,62 @@
+import { Plugin } from '@tiptap/pm/state';
+import {
+  handleGridDecorations,
+  handleMouseDown,
+  handleMouseLeave,
+  handleMouseMove,
+  handleMouseUp,
+} from './dom';
+import { GridResizeState, gridResizingPluginKey } from './state';
+
+export function gridResizingPlugin(options?: {
+  handleWidth?: number;
+  columnMinWidth?: number;
+}) {
+  const handleWidth = options?.handleWidth ?? 2;
+  const columnMinWidth = options?.columnMinWidth ?? 50;
+
+  return new Plugin<GridResizeState>({
+    key: gridResizingPluginKey,
+
+    state: {
+      init: () => new GridResizeState(-1, false),
+      apply: (tr, prev) => {
+        return prev.apply(tr);
+      },
+    },
+
+    props: {
+      attributes: (state): Record<string, string> => {
+        const pluginState = gridResizingPluginKey.getState(state);
+        if (pluginState && pluginState.activeHandle > -1) {
+          return { class: 'resize-cursor' };
+        }
+        return {};
+      },
+
+      // The main event handlers
+      handleDOMEvents: {
+        mousemove: (view, event: MouseEvent) => {
+          return handleMouseMove(view, event, handleWidth);
+        },
+        mouseleave: (view) => {
+          return handleMouseLeave(view);
+        },
+        mousedown: (view, event: MouseEvent) => {
+          return handleMouseDown(view, event, columnMinWidth);
+        },
+        mouseup: (view, event: MouseEvent) => {
+          return handleMouseUp(view, event);
+        },
+      },
+
+      decorations: (state) => {
+        const pluginState = gridResizingPluginKey.getState(state);
+        if (!pluginState) return null;
+        if (pluginState.activeHandle === -1) return null;
+
+        return handleGridDecorations(state, pluginState.activeHandle);
+      },
+    },
+  });
+}

packages/editor-ext/src/lib/columns/schema.ts

@@ -0,0 +1,51 @@
+import { NodeSpec } from '@tiptap/pm/model';
+
+export type ColumnNodes = Record<'column' | 'column_container', NodeSpec>;
+
+export function columnNodes(): ColumnNodes {
+  return {
+    column: {
+      group: 'block',
+      content: 'block+',
+      attrs: {
+        colWidth: { default: 200 },
+      },
+      parseDOM: [
+        {
+          tag: 'div.prosemirror-column',
+          getAttrs(dom) {
+            if (!(dom instanceof HTMLElement)) return false;
+            const width = dom.style.width.replace('px', '') || 200;
+            return {
+              colWidth: width,
+            };
+          },
+        },
+      ],
+      toDOM(node) {
+        const { colWidth } = node.attrs;
+        const style = colWidth ? `width: ${colWidth}px;` : '';
+        return [
+          'div',
+          {
+            class: 'prosemirror-column',
+            style,
+          },
+          0,
+        ];
+      },
+    },
+    column_container: {
+      group: 'block',
+      content: 'column+',
+      parseDOM: [
+        {
+          tag: 'div.prosemirror-column-container',
+        },
+      ],
+      toDOM() {
+        return ['div', { class: 'prosemirror-column-container' }, 0];
+      },
+    },
+  };
+}

packages/editor-ext/src/lib/columns/state.ts

@@ -0,0 +1,33 @@
+import { PluginKey, Transaction } from '@tiptap/pm/state';
+
+export const gridResizingPluginKey = new PluginKey<GridResizeState>(
+  'gridResizingPlugin',
+);
+
+export type Dragging = {
+  startX: number;
+  startWidth: number;
+};
+
+export class GridResizeState {
+  constructor(
+    public activeHandle: number,
+    public dragging: Dragging | false,
+  ) {}
+
+  apply(tr: Transaction): GridResizeState {
+    const action = tr.getMeta(gridResizingPluginKey);
+    if (!action) return this;
+
+    if (typeof action.setHandle === 'number') {
+      return new GridResizeState(action.setHandle, false);
+    }
+    if (action.setDragging !== undefined) {
+      return new GridResizeState(this.activeHandle, action.setDragging);
+    }
+    if (this.activeHandle > -1 && tr.docChanged) {
+      // remap when doc changes
+    }
+    return this;
+  }
+}

packages/editor-ext/src/lib/columns/tiptap.ts

@@ -0,0 +1,84 @@
+import { Node, mergeAttributes, Extension } from '@tiptap/core';
+import { columnsKeymap } from './keymap';
+import { gridResizingPlugin } from './resize';
+
+const Column = Node.create({
+  name: 'column',
+
+  group: 'block',
+  content: 'block+',
+
+  addAttributes() {
+    return {
+      colWidth: {
+        default: 200,
+        parseHTML: (element) => {
+          const width = (element as HTMLElement).style.width.replace('px', '');
+          return Number(width) || 200;
+        },
+        renderHTML: (attributes) => {
+          const style = attributes.colWidth
+            ? `width: ${attributes.colWidth}px;`
+            : '';
+          return { style };
+        },
+      },
+    };
+  },
+
+  parseHTML() {
+    return [
+      {
+        tag: 'div.prosemirror-column',
+      },
+    ];
+  },
+
+  renderHTML({ HTMLAttributes }) {
+    return [
+      'div',
+      mergeAttributes(HTMLAttributes, { class: 'prosemirror-column' }),
+      0,
+    ];
+  },
+});
+
+const ColumnContainer = Node.create({
+  name: 'column_container',
+
+  group: 'block',
+  content: 'column+',
+
+  parseHTML() {
+    return [
+      {
+        tag: 'div.prosemirror-column-container',
+      },
+    ];
+  },
+
+  renderHTML({ HTMLAttributes }) {
+    return [
+      'div',
+      mergeAttributes(HTMLAttributes, {
+        class: 'prosemirror-column-container',
+      }),
+      0,
+    ];
+  },
+});
+
+export const ColumnsExtension = Extension.create({
+  name: 'columns',
+
+  addExtensions() {
+    return [Column, ColumnContainer];
+  },
+
+  addProseMirrorPlugins() {
+    return [
+      gridResizingPlugin({ handleWidth: 2, columnMinWidth: 50 }),
+      columnsKeymap,
+    ];
+  },
+});

packages/editor-ext/src/lib/columns/utils.ts

@@ -0,0 +1,75 @@
+import { EditorView } from '@tiptap/pm/view';
+import { type Dragging } from './state';
+
+export function findBoundaryPosition(
+  view: EditorView,
+  event: MouseEvent,
+  handleWidth: number,
+): number {
+  const gridDOM = event
+    .composedPath()
+    .find((el) =>
+      (el as HTMLElement).classList?.contains('prosemirror-column-container'),
+    ) as HTMLElement | undefined;
+  if (!gridDOM) return -1;
+
+  const children = Array.from(gridDOM.children).filter((el) =>
+    el.classList.contains('prosemirror-column'),
+  );
+  for (let i = 0; i < children.length; i++) {
+    const colEl = children[i] as HTMLElement;
+    const rect = colEl.getBoundingClientRect();
+    if (
+      event.clientX >= rect.right - handleWidth - 2 &&
+      event.clientX <= rect.right + 10 + handleWidth
+    ) {
+      const pos = view.posAtDOM(colEl, 0);
+      if (pos != null) {
+        return pos;
+      }
+    }
+  }
+
+  return -1;
+}
+
+export function draggedWidth(
+  dragging: Dragging,
+  event: MouseEvent,
+  minWidth: number,
+): number {
+  const offset = event.clientX - dragging.startX;
+  return Math.max(minWidth, dragging.startWidth + offset);
+}
+
+export function updateColumnNodeWidth(
+  view: EditorView,
+  pos: number,
+  attrs: Record<string, string>,
+  width: number,
+) {
+  view.dispatch(
+    view.state.tr.setNodeMarkup(pos, undefined, {
+      ...attrs,
+      colWidth: width - 12 * 2,
+    }),
+  );
+}
+
+export function getColumnInfoAtPos(view: EditorView, boundaryPos: number) {
+  const $pos = view.state.doc.resolve(boundaryPos);
+  const node = $pos.parent;
+  if (!node || node.type.name !== 'column') return null;
+
+  const dom = view.domAtPos($pos.pos);
+  if (!dom.node) return null;
+
+  const columnEl =
+    dom.node instanceof HTMLElement
+      ? dom.node
+      : (dom.node.childNodes[dom.offset] as HTMLElement);
+
+  const domWidth = columnEl.offsetWidth;
+
+  return { $pos, node, columnEl, domWidth };
+}