GSH

GSH: Interactive Gleam Shell
GSH is an interactive Read-Eval-Print Loop (REPL) designed for the Gleam Programming Language, built on the powerful BEAM virtual machine. It provides a seamless and efficient environment for developers to write, debug, and execute Gleam code interactively.

Key Features

• Interactive Environment: Utilize GSH as a standalone REPL or as a live-app bootloader to execute and manage Gleam code efficiently.

• Dynamic Evaluation: Evaluate expressions on-the-fly with rapid feedback, significantly reducing latency for real-time application development.

• Robust Command Set: With built-in commands such as :h for help, :v for version checking, and :cc to recompile the host Gleam project without leaving the shell, GSH enhances the interactive coding experience.

• Smart Suggestions & Autocompletion: Experience advanced capabilities like tab-completion and context-aware suggestions while writing code.

• Resilient Memory Management: GSH uses a single persistent Erlang VM node that optimizes variable binding and executes commands without reintroducing side effects.

Usage Example

To start using GSH:

gleam run -m gsh  

Once inside the shell, interact with your Gleam code, for instance:

import your_app/config  
ok  
config.load()  

Enhanced Development

GSH is particularly useful for:

• Function and Module Debugging: Quickly test functions with mock data.
• Gleam Ecosystem Exploration: Easily interact with the Gleam libraries and frameworks.
• Scratch Pad Usage: Validate logic and trivial constructs swiftly within the interactive environment.

Performance Benefits

GSH boasts a rapid in-memory compilation pipeline that drastically reduces execution latency from approximately 375 milliseconds to under 18 milliseconds, allowing for efficient coding and debugging sessions.

Conclusion

GSH transforms the Gleam programming experience by offering developers a powerful tool for quick iterations, debugging, and interaction with the BEAM ecosystem. With its focus on performance and usability, GSH serves as an invaluable resource for programmers working with Gleam.