Show HN: Shelgon: A Framework for Building Interactive REPL Shells in Rust

I've been working on Shelgon, a framework that lets you build your own custom REPL shells and interactive CLI applications in Rust.You can use Shelgon to:- Create a custom shell with only a few lines of code - Build interactive debugging tools with persistent state between commands - Develop domain-specific language interpreters with shell-like interfaces - Add REPL capabilities to existing applicationsGetting started is straightforward - implement a single trait that handles your command execution logic, and Shelgon takes care of the terminal UI, input handling, and async runtime integration.For example, a simple echo shell takes less than 50 lines of code, including a full implementation of command history, cursor movement, and tab completion.Repository: https://github.com/nishantjoshi00/shelgon Comments URL: https://news.ycombinator.com/item?id=43284227 Points: 11 # Comments: 0

Mar 6, 2025 - 20:59

Show HN: Shelgon: A Framework for Building Interactive REPL Shells in Rust

I've been working on Shelgon, a framework that lets you build your own custom REPL shells and interactive CLI applications in Rust.

You can use Shelgon to:

- Create a custom shell with only a few lines of code - Build interactive debugging tools with persistent state between commands - Develop domain-specific language interpreters with shell-like interfaces - Add REPL capabilities to existing applications

Getting started is straightforward - implement a single trait that handles your command execution logic, and Shelgon takes care of the terminal UI, input handling, and async runtime integration.

For example, a simple echo shell takes less than 50 lines of code, including a full implementation of command history, cursor movement, and tab completion.