Automerge prosemirror plugin

Status

Support for all elements in the prosemirror-schema-basic and prosemirror-schema-list except for the hr element is implemented. The next step is to generalize this to allow adapting user provided schemas.

In general this is alpha quality software. There are still a fair number of bugs and the API will probably change, but the core functionality works most of the time.

How to play

This work depends on the @automerge/automerge >= 2.2.0 package, so you'll need to update your dependencies.

There is a fully functional editor in this repository, you can play with that by running npm run playground and then visiting http://localhost:5173.

Example

The API for this library is based around an object called an AutoMirror. This object is used to intercept transactions from Prosemirror and to handle changes received over the network. This is best used in tandem with @automerge/automerge-repo. See the playground/src/Editor.tsx file for a fully featured example.

The workflow when using this library is to first create an AutoMirror object, then use AutoMirror.initialize to create an initial prosemirror document and AutoMirror.schema to get a schema which you pass to prosemirror. Then, you intercept transactions from prosemirror using AutoMirror.intercept and you reconcile patches from the network using AutoMirror.reconcilePatch.

For example

import {AutoMirror} from "@automerge/prosemirror"

//

const handle = repo.find("some-doc-url")
// somehow wait for the handle to be ready before continuing
await handle.whenReady()

// Create an AutoMirror
const autoMirror = new AutoMirror(["text"])

// Create your prosemirror state
let editorConfig = {
  schema: autoMirror.schema, // This _must_ be the schema from the AutoMirror
  ..., // whatever other stuff
  plugins: [
    keymap({
      ...baseKeymap,
      "Mod-b": toggleBold,
      "Mod-i": toggleItalic,
      "Mod-z": undo,
      "Mod-y": redo,
      "Mod-Shift-z": redo,
    }),
  ],
  doc: autoMirror.initialize(handle.docSync())
}

let state = EditorState.create(editorConfig)


const view = new EditorView(editorRoot.current, {
  state,
  dispatchTransaction: (tx: Transaction) => {
    // Here we intercept the transaction
    let newState = autoMirror.intercept(automerge.getHeads(handle.doc), doChange, tx, view.state)
    view.updateState(newState)
  }
})

// This is a callback which you wire up to be called anytime there are changes
// received from elsewhere. The type signature here assuems you're using
// automerge-repo
const onPatch = (p: DocHandlePatchPayload<any>) => {
  const newState = autoMirror.reconcilePatch(
    patchInfo.before,
    doc,
    patches,
    view.state,
  )
  view.updateState(newState)
}
// somehow wire up the callback
handle.on("patch", onPatch)