command

Command

Command is behavioral design pattern that converts requests or simple operations into objects.

In 🦀 Rust, a command instance should NOT hold a permanent reference to global context, instead the latter should be passed from top to down as a mutable parameter of the "execute" method:

fn execute(&mut self, app: &mut cursive::Cursive) -> bool;

Text Editor: Commands and Undo

How to launch:

cargo run --bin command

Key points:

• Each button runs a separate command.
• Because a command is represented as an object, it can be pushed into a history array in order to be undone later.
• TUI is created with cursive crate.

Reference

This example is inspired by Command in Java (Example).