ansi-pretty-print

A Rust library for pretty-printing structured data with ANSI color support and ligatures. Mostly used for debug outputs for compilers.

Features

• ANSI Color Support: Syntax highlighting with customizable colors
• Indentation Management: Automatic indentation for nested structures
• Ligature Support: Optional use of Unicode ligatures (←, →, ↔, ϕ)
• Semantic Coloring: Different colors for keywords, types, literals, operators, etc.
• Flexible: Toggle colors and ligatures on/off

Installation

Add this to your Cargo.toml:

[dependencies]
ansi-pretty-print = "0.0.1"

Usage

use ansi_pretty_print::Printer;
use std::fmt::Write;

let mut output = String::new();
let mut printer = Printer::new(&mut output)
    .with_colors(true)
    .with_ligature(true);

// Print with semantic coloring
printer.keyword("fn")?;
printer.write(" ")?;
printer.function_name("main")?;
printer.punctuation("()")?;

// Use blocks with automatic indentation
printer.block("", |p| {
    p.line("println!(\"Hello, world!\");")?;
    Ok(())
})?;

println!("{}", output);

License

Licensed under the MIT License. See LICENSE for details.

Copyright (c) 2025 Peter Bjorklund. All Rights Reserved.