Open .rs files on your Mac.
.rs
Rust source with keywords, types, macros, strings and lifetimes in color.
Loper is a free, minimal editor for macOS that opens Rust instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.
Show the file as text
use std::fs;use std::path::Path; /// Counts the lines in a text file.fn count_lines(path: &Path) -> std::io::Result<usize> { let text = fs::read_to_string(path)?; Ok(text.lines().count())} fn main() { let path = Path::new("A001.mhl"); match count_lines(path) { Ok(lines) => println!("{} lines", lines), Err(error) => eprintln!("cannot read: {error}"), }}How to open .rs files
- Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
- Double-click your .rs file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
- Want every .rs file to open in Loper? Choose Loper › Make Loper the Default Editor….
More for developers
Environment files .envMarkdown .mdJSON .jsonYAML .ymlTOML .tomlTypeScript & JavaScript .tsPython .pyShell scripts & dotfiles .shSQL .sqlPlain text .txtINI configuration .iniPython setup.cfg / tool config .cfgJava properties .propertiesHTML .htmlCSS and SCSS .cssJavaScript .jsGo .goLua .luaDiff and patch .diff