Building a CLI Tool in Rust: From Zero to Published on crates.io

Most CLI tools are written in Python or Node. They work, but they are slow to start, need a runtime, and distribute poorly. Rust gives you single-binary distribution, sub-millisecond startup, and fearless concurrency. Here is how to build a file searcher called hunt from scratch to published crate. Project Setup cargo new hunt && cd hunt [package] name = "hunt" version = "0.1.0" edition = "2021" description = "A fast file content searcher" license = "MIT" [dependencies] clap = { version = "4" , features = [ "derive" ] } regex = "1" colored = "2" anyhow = "1" ignore = "0.4" Argument Parsing with Clap Clap derive API turns a struct into a full CLI parser: use clap :: Parser ; use std :: path :: PathBuf ; #[derive(Parser, Debug)] #[command(name = "hunt" , about = "Search file contents, fast" )] pub struct Args { /// Regex pattern to search for pub pattern : String , /// Directory or file to search #[arg(default_value = "." )] pub path : PathBuf , /// Case-insensitive search #[arg(short, l