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…
Shelgon: A Framework for Building Interactive REPL Shells in Rust launched on March 6, 2025 with 130 votes, #337 of 7,215 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Shelgon is a Rust framework for building custom REPL shells and interactive CLI applications. Developers can create command-line tools with persistent state, domain-specific language interpreters, or debugging interfaces by implementing a single trait, while the framework handles terminal UI, input processing, and async runtime. A basic echo shell requires fewer than 50 lines of code and includes command history, cursor navigation, and tab completion.
written from the facts on this page · September 2026
From the sources
Contribute to NishantJoshi00/shelgon development by creating an account on GitHub.
Shelgon is a robust Rust framework for building interactive REPL (Read-Eval-Print Loop) applications and custom shells. It provides a flexible, type-safe foundation with built-in terminal UI capabilities using ratatui . [ dependencies ] shelgon = " 0.1.0 " tokio = { version = " 1.43.0 " , features = [ " full " ] } anyhow = " 1.0.95 " Quick Start Create a simple echo shell: use shelgon :: { command , renderer } ; struct EchoExecutor { } impl command :: New for EchoExecutor { fn new ( ) -> anyhow :: Result < ( Self , ( ) ) > { Ok ( ( Self { } , ( ) ) ) } } impl command :: Execute for EchoExecutor { type Context = ( ) ; fn prompt ( & self , _ : & Self :: Context ) -> String { "$" . to_string (…from github.com
In the maker’s words, at launch
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…
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