$ show Schniz/fnm
fnm (Fast Node Manager) is a cross-platform Node.js version manager built in Rust. It allows users to install, switch between, and manage multiple Node.js versions on a single system. The application features automatic version switching based on directory via .node-version or .nvmrc files, shell integration for Bash, Zsh, Fish, and PowerShell, version aliasing, and the ability to execute commands with specific Node.js versions. Built with performance and reliability in mind, fnm provides a modern alternative to tools like nvm with faster startup times and more robust shell integration.
The LLM identified 3 files worth highlighting for reuse:
Implements a safe pattern for directory operations using a temporary directory that only moves to the target location on success. This prevents leaving the filesystem in an inconsistent state if an operation fails midway. The component is self-contained, well-documented with explanatory comments, and includes tests demonstrating its usage.
Wraps reqwest HTTP responses to display download progress bars using indicatif. Automatically handles content-length headers to show accurate progress and cleans up the progress bar when done. This reusable pattern solves the common problem of providing user feedback during file downloads.
Defines a sophisticated Version enum that handles multiple version formats (semver, LTS, aliases, latest, and system bypass). Provides parsing, string representation, installation path resolution, and alias finding capabilities. This core component demonstrates thoughtful design for version management logic that could be reused in other version tools.