Stories with Tag REPL

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

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  Posted: 2025-03-06 19:32:12

  Verbose tl;dr

  Shelgon is a Rust framework designed for creating interactive REPL (Read-Eval-Print Loop) shells. It offers a structured approach to building REPLs by providing features like command parsing, history management, autocompletion, and help text generation. Developers can define commands with associated functions, arguments, and descriptions, allowing for easy extensibility and a user-friendly experience. Shelgon aims to simplify the process of building robust and interactive command-line interfaces within Rust applications.

  Nishant Joshi has introduced Shelgon, a Rust framework designed to simplify the creation of interactive Read-Eval-Print Loops (REPLs). REPLs provide a dynamic environment where users can input commands, have them executed, and see the results immediately, making them powerful tools for experimentation, debugging, and interactive development. Shelgon aims to streamline the process of building these interactive shells by offering a structured and efficient approach within the Rust programming language.

  The framework leverages Rust's ownership and borrowing system to ensure memory safety and prevent common concurrency issues often encountered in REPL development. It provides developers with a set of pre-built components and abstractions, handling the complexities of command parsing, execution, and output formatting. This allows developers to focus on the core logic of their REPL, defining the specific commands and their behavior, rather than grappling with the underlying infrastructure.

  Shelgon employs a modular architecture, enabling developers to customize and extend the functionality of their REPLs with ease. It supports the integration of custom command parsers, allowing for flexibility in handling different input formats. Furthermore, Shelgon facilitates the creation of interactive help systems and auto-completion features, enhancing the user experience within the REPL environment.

  The project emphasizes simplicity and ease of use, aiming to provide a clear and intuitive API for developers. The stated goal is to empower Rust developers to quickly and efficiently build robust and feature-rich REPLs for a wide range of applications, from scripting and prototyping to embedded systems and command-line utilities. By abstracting away the low-level details of REPL management, Shelgon allows developers to concentrate on the unique aspects of their specific use case, ultimately fostering a more productive and enjoyable development experience.

  • Rust
  • REPL
  • shell
  • Framework
  • interactive
  • cli
  • Command-Line Interface
  • developer tools
  • terminal
  • tui
  • Text User Interface
  • Open Source
  • GitHub

  Summary of Comments ( 7 )
  https://news.ycombinator.com/item?id=43284227

  Verbose tl;dr

  HN users generally praised Shelgon for its clean design and the potential usefulness of a framework for building REPLs in Rust. Several commenters expressed interest in using it for their own projects, highlighting the need for such a tool. One user specifically appreciated the use of async/await for asynchronous operations. Some discussion revolved around alternative approaches and existing REPL libraries in Rust, such as rustyline and repl_rs, with comparisons to Python's prompt_toolkit. The project's relative simplicity and focus were seen as positive attributes. A few users suggested minor improvements, like adding command history and tab completion, features the author confirmed were planned or already partially implemented. Overall, the reception was positive, with commenters recognizing the value Shelgon brings to the Rust ecosystem.

  The Hacker News post titled "Show HN: Shelgon: A Framework for Building Interactive REPL Shells in Rust" generated a modest discussion with a few interesting comments. No one expressed outright negativity toward the project.

  One commenter pointed out that the project appears similar to rustyline, a popular Rust library for creating command-line interfaces, and asked the author about the advantages of Shelgon over this established solution. This comment highlighted a common concern when introducing a new tool in a space with existing options: demonstrating a clear and compelling reason for its existence. The author responded by explaining that Shelgon is designed to be more flexible and extensible than rustyline, particularly for building complex REPLs with features beyond basic line editing. They specifically mentioned the ability to easily create custom keybindings and widgets, suggesting Shelgon might be better suited for highly interactive interfaces.

  Another commenter expressed their interest in the project, mentioning their own struggles with creating a REPL in Rust and hoping that Shelgon would simplify the process. This comment underscores the potential value of such a framework for the Rust community.

  Other comments were shorter and more general, offering words of encouragement or simply acknowledging the project's existence. One commenter suggested publishing the project to crates.io, the central package registry for the Rust ecosystem, to increase its visibility and accessibility. This is a standard recommendation for new Rust projects seeking wider adoption.

  Overall, the comments reflect a generally positive reception to Shelgon. The most compelling points revolve around its potential advantages over existing solutions like rustyline, its ability to address a specific need within the Rust community for easier REPL creation, and the practical advice regarding publishing on crates.io. There wasn't a large volume of discussion, but the existing comments provide valuable feedback and context for the project.

• Show HN: Iterm-Mcp – AI Terminal/REPL Control for iTerm2

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  Posted: 2025-01-30 18:14:46

  Verbose tl;dr

  iterm-mcp is a plugin that brings AI-powered control to iTerm2, allowing users to interact with their terminal and REPLs using natural language. It leverages large language models to translate commands like "list files larger than 1MB" into the appropriate shell commands, and can even generate code snippets within the terminal. The plugin aims to simplify complex terminal interactions and improve productivity by bridging the gap between human intention and shell execution.

  The Hacker News post introduces iterm-mcp, a new tool designed to enhance the iTerm2 terminal experience by integrating AI-powered control specifically for Terminals and REPLs (Read-Eval-Print Loops). iterm-mcp leverages the power of Large Language Models (LLMs) to provide intelligent assistance and automation within the iTerm2 environment.

  The project aims to streamline common terminal tasks and improve the interactive coding experience within REPLs. Instead of manually searching documentation or recalling complex commands, users can interact with the LLM through natural language queries. For instance, a user could ask the AI to explain a specific error message, generate a command to perform a certain action, or even refactor a piece of code directly within the REPL.

  iterm-mcp achieves this functionality by acting as a bridge between iTerm2 and a chosen LLM. It captures the context of the current terminal session, including the command history, the output of previous commands, and the current state of the REPL. This context is then fed to the LLM, allowing it to generate relevant and accurate responses. The responses are then presented within iTerm2, enabling a seamless workflow.

  The project is open-source and available on GitHub, encouraging community contributions and further development. While initially focused on iTerm2, the underlying principles could potentially be adapted to other terminal emulators in the future. The stated goal is to transform the terminal from a purely text-based interface into a more intelligent and interactive environment, empowering users with the capabilities of AI. The post implies that iterm-mcp can significantly boost productivity for developers and anyone who frequently interacts with the terminal or REPLs.

  • iTerm2
  • terminal
  • REPL
  • AI
  • shell
  • cli
  • command-line
  • productivity
  • macOS
  • Automation
  • Tool
  • Open Source
  • GitHub
  • iterm-mcp

  Summary of Comments ( 9 )
  https://news.ycombinator.com/item?id=42880449

  Verbose tl;dr

  HN users generally expressed interest in iterm-mcp, praising its innovative approach to terminal interaction. Several commenters highlighted the potential for improved workflow efficiency through features like AI-powered command generation and execution. Some questioned the reliance on OpenAI's APIs, citing cost and privacy concerns, while others suggested alternative local models or incorporating existing tools like copilot. The discussion also touched on the possibility of extending the tool beyond iTerm2 to other terminals. A few users requested a demo video to better understand the functionality. Overall, the reception was positive, with many acknowledging the project's potential while also offering constructive feedback for improvement.

  The Hacker News post for "Show HN: Iterm-Mcp – AI Terminal/REPL Control for iTerm2" has generated several comments discussing the project's potential, limitations, and alternative approaches.

  Several commenters express excitement about the possibilities of AI-driven terminal control. One user envisions using it to automate complex tasks, like setting up development environments or debugging Kubernetes clusters. They highlight the potential time savings and reduced cognitive load such a tool could offer. Another commenter suggests integrating it with other AI tools to create even more powerful workflows, specifically mentioning GitHub Copilot. The general sentiment among these positive comments is that this project represents a promising direction for terminal interaction.

  However, other commenters express concerns and skepticism. One recurring theme is the potential for security risks. Giving an AI control over a terminal could have serious consequences if the AI makes mistakes or is exploited by malicious actors. Commenters raise questions about how to ensure the safety and reliability of such a system. There are suggestions for sandboxing and careful permission management to mitigate these risks. Another concern revolves around the complexity of training the AI model. Some users question whether the benefits outweigh the effort required to train the AI effectively, particularly for niche or specialized tasks.

  Several commenters mention existing tools and alternative approaches. Some point to existing automation tools like shell scripts and tmux, suggesting that these might be sufficient for many tasks. Others mention alternative AI-driven coding assistants, like GitHub Copilot, as potentially overlapping in functionality. One commenter proposes a more limited approach, focusing on specific tasks like generating shell commands based on natural language input, rather than granting full terminal control.

  A few commenters offer constructive feedback and suggestions for the project. One user requests support for fish shell, while another suggests integrating with existing terminal multiplexers like tmux. Another commenter expresses interest in seeing a demo video to better understand the project's capabilities.

  Overall, the comments reflect a mixture of excitement and caution regarding the prospect of AI-driven terminal control. While many see the potential for increased productivity and automation, there are also significant concerns about security and complexity that need to be addressed. The discussion highlights the need for careful consideration of the trade-offs involved in granting AI control over such a powerful environment.