Ewig - Eternal Didactic Text Editor

The eternal text editor — Didactic Ersatz Emacs demonstrating immutable data-structures and the single-atom architecture.

Repository

• Source: https://github.com/bmorphism/ewig (fork of arximboldi/ewig)
• Language: C++ (immer library)
• Pattern: Persistent data structures + single atom state

Core Concept

Ewig demonstrates how to build a text editor using:

1. Immutable data structures - All state changes create new versions
2. Single-atom architecture - One atom holds the entire application state
3. Structural sharing - Efficient memory via shared structure

// Single atom state
atom<editor_state> state;