MahiTahi

a Python-based (sequence) CRDT library for collaborative text editing

WARNING: this repo is not maintained anymore

Status: WIP/Proof of concept

This library relies on the ideas presentend in Logoot and LSEQ.

See examples/mqtt_gui.py for an Etherpad-like clone realized with PyQt's QPlainTextEdit widget, MQTT as broadcast channel and Fernet for encryption.

Table of Contents

• Installation
• Usage
• Example
• Running tests
• License

Installation

Download or clone the repository using git:

$ git clone https://github.com/0ip/mahitahi.git

Usage

from mahitahi import Doc

init_doc = Doc()
init_doc.insert(0, "A")
init_doc.insert(1, "B")
init_doc.insert(2, "C")
init_doc.insert(3, "\n")

a_doc = deepcopy(init_doc)
a_doc.site = 1
patch_from_a = a_doc.insert(1, "x")

b_doc = deepcopy(init_doc)
b_doc.site = 2
patch_from_b = b_doc.delete(2)

a_doc.apply_patch(patch_from_b)

assert a_doc.text == "AxB\n"

b_doc.apply_patch(patch_from_a)

assert b_doc.text == "AxB\n"

Example

Starting examples/mqtt_gui.py prompts the user for a "Portal ID". This ID contains the MQTT host, the pad name and the encryption token. It is intented to share this ID with someone you want to edit this pad with, without the need to manually enter these connection details.

Running tests

In order to run tests, make sure to have PyTests installed, then run

$ PYTHONPATH=. pytest

License

This repository has been released under the MIT License.