jahfer / ot

Implementation of full Operational Transform editor in Clojure. Library version: https://github.com/jahfer/othello

ot

ot is a basic implementation of Operational Transforms, used to resolve concurrent edits of a document from multiple sources.

Is this what I want?

Probably not. This is a first-pass at the idea. The library extracted from this is probably what you're interested in: jahfer/othello. There's also an implementation using that library available at jahfer/othello-editor.

Usage

Start server:

$ lein server

Start server using reloaded pattern:

$ lein repl
ot.repl> (go) # change code...
ot.repl> (reset)

Compile and watch cljs + cljx:

$ lein client # runs tests on compile!
$ lein cljx auto

Run tests:

$ lein cleantest

Run specific group of tests:

$ lein do cljx, clj-test # or...
$ lein do cljx, cljs-test

References

• Understanding and Applying Operational Transformation
• Operational Transform on Wikipedia
• OT FAQ
• Google Wave Operational Transformation
• OT Explained

License

Copyright © 2015 EPL

Distributed under the Eclipse Public License version 1.0.

ot's Issues

Incorrect caret tracking

Bug
When text is inserted before the caret, the caret does not move. If text is typed after the user's caret, the editor behaves as expected (does not move the caret).

Expected behaviour
It should increment n times where n is the number of characters inserted before the caret.

Composition tree for fast playback of history

Chunk history into a tree of blocks. Allows skimming through history efficiently.

See presentation from Google I/O