blazer

A blazing-fast, dependency-minimal Rust library for styling, coloring, and enhancing command-line interfaces.

Basic Example:

use blazer::Stylize;

println!("{}", "Success!".green().bold());
println!("{}", "Warning!".yellow().underline());
println!("{}", "Error!".white().on_red().bold());
println!("{}", "Custom".rgb(255, 140, 0));

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Table of Contents

• Overview
• Installation
• Features
  • Text Styling
  • Progress Bars
  • Spinners
  • Tables
  • CLI Symbols
  • Terminal Utilities
• Color Support
• API Documentation
• Examples
• Terminal Compatibility
• Contributing
• License

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Overview

blazer gives you a clean, ergonomic API for every common CLI visual need — from simple colored output to animated spinners and formatted tables — with zero mandatory runtime dependencies beyond libc (Unix only) and the standard library.

Concern	Solution
Colors & styles	Stylize trait (chainable)
Progress feedback	ProgressBar widget
Indeterminate feedback	Spinner (background thread)
Tabular data	Table with box-drawing
Symbol/icon shorthand	symbols module (✔ ✗ ➜ …)
Terminal introspection	terminal module (size, color check)

---

Installation

Add blazer to your Cargo.toml:

[dependencies]

blazer = "0.1"

Or use the command line:

cargo add blazer

---

Features

Text Styling

The Stylize trait implements on &str and String, giving you chainable methods for foreground colors, background colors, and text attributes.

use blazer::Stylize;

// 16 standard ANSI colors + 16 bright variants
println!("{}", "red".red());
println!("{}", "bright blue".bright_blue());

// Text attributes (chain freely)
println!("{}", "bold italic underline".bold().italic().underline());
println!("{}", "dim strikethrough".dim().strikethrough());
println!("{}", "reversed".reverse());

// Background colors
println!("{}", "white on magenta".white().on_magenta());
println!("{}", "black on yellow".black().on_yellow());

// Custom foreground / background
println!("{}", "indigo".rgb(75, 0, 130));
println!("{}", "salmon bg".white().on_rgb(250, 128, 114));

// 256-color palette (0-255)
println!("{}", "orange".fixed(202));

Every styled string automatically resets at the end, so you never have to worry about leaking styles into subsequent output.

---

Progress Bars

ProgressBar renders a customizable bar directly to the terminal, updating in place on each draw call.

use blazer::progress::ProgressBar;
use std::{thread, time::Duration};

fn main() {
    let mut bar = ProgressBar::new(100)
        .with_label("Downloading")
        .with_width(50)
        .with_chars('▓', '░');

    for i in 0..=100 {
        bar.set_position(i);
        bar.draw();
        thread::sleep(Duration::from_millis(20));
    }

    bar.finish_with_message("Download complete!");
}

Output:

Downloading [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100% Download complete!

Builder options:

Method	Description
with_width(n)	Set bar width in characters
with_chars(filled, empty)	Choose fill characters
with_label("text")	Display a label before the bar
show_percentage(bool)	Toggle the trailing percentage
inc(delta)	Increment progress
finish() / finish_with_message(msg)	Complete the bar

---

Spinners

Spinner animates on a background thread so your main thread stays free.

use blazer::spinner::Spinner;
use blazer::symbols::frames;
use std::{thread, time::Duration};

fn main() {
    let mut spinner = Spinner::new("Fetching data…")
        .with_frames(frames::ARROW)
        .with_interval(Duration::from_millis(100));

    spinner.start();
    thread::sleep(Duration::from_secs(3));
    spinner.stop("✓ Data fetched successfully!");
}

Built-in frame sets in blazer::symbols::frames:

Constant	Animation	Example frames
DOTS	Classic braille dots	⠋ ⠙ ⠹ ⠸ ⠼ ⠴ …
LINE	Simple ASCII (portable)	`- \
BAR	Growing / shrinking bar	▁ ▃ ▄ ▅ ▆ ▇ █
ARROW	Rotating arrow	← ↖ ↑ ↗ → ↘ ↓ ↙

You can also supply your own &'static [&'static str].

---

Tables

Table renders customizable, neatly aligned, box-drawn tables with flexible padding and border configurations.

use blazer::table::{Alignment, Borders, Padding, Table};

fn main() {
    let mut table = Table::new(vec!["Package", "Version", "Status"])
        .with_borders(Borders::ASCII)
        .with_alignment(Alignment::Left);

    table.add_row(vec!["serde", "1.0.188", "✔"]);
    table.add_row(vec!["tokio", "1.32.0", "✔"]);
    table.add_row(vec!["blazer", "0.1.0", "✔"]);

    println!("{table}");
}

Output:

+----------+---------+--------+
| Package  | Version | Status |
+----------+---------+--------+
| serde    | 1.0.188 | ✔      |
| tokio    | 1.32.0  | ✔      |
| blazer   | 0.1.0   | ✔      |
+----------+---------+--------+

Border Presets (Borders)

Constant	Preview	Description
Borders::SINGLE	─ │ ┼	Standard single-line box drawing
Borders::DOUBLE	═ ║ ╬	Heavy double-line box drawing
Borders::ASCII	- | +	Plain ASCII characters for maximum portability
Borders::DASHED	╌ ╎ ┼	Dashed Unicode border style
Borders::DOTTED	┄ ┊ ┼	Dotted Unicode border style
Borders::EMPTY	(None)	Completely borderless rendering

You can also create fully custom borders or turn off borders with .borderless().

// Custom border
let custom_borders = Borders::empty().horizontal('-').vertical('|');

// Borderless helper
let table = Table::new(vec!["Key", "Value"]).borderless();

Padding Options (Padding)

Control left, right, and fill character properties on cells:

// Uniform spacing
let pad = Padding::uniform(2);

// Asymmetric padding
let pad = Padding::new(1, 3, ' ');

// Custom fill character
let pad = Padding::uniform_with_fill(1, '.');

---

CLI Symbols

Ready-to-use Unicode symbols for common CLI meaning, living in blazer::symbols:

use blazer::symbols::*;
use blazer::Stylize;

println!("{} {}", CHECK.green().bold(), "Build passed");
println!("{} {}", CROSS.red().bold(), "Tests failed");
println!("{} {}", WARNING.yellow().bold(), "Deprecated API");
println!("{} {}", INFO.cyan(), "Tip: run --help");
println!("{} {}", ARROW_RIGHT.magenta(), "Continue? [y/N]");

Constant	Glyph	Typical use
CHECK	✔	Success / passed
CROSS	✖	Failure / error
WARNING	⚠	Warning / caution
INFO	ℹ	Informational note
ARROW_RIGHT	➜	Prompt / direction
BULLET	•	List item
STAR	★	Favorite / rating
HOURGLASS	⌛	Waiting / processing
HEART	♥	Appreciation
ELLIPSIS	…	Truncation

---

Terminal Utilities

use blazer::terminal;

// Get terminal size (columns, rows)
if let Some((cols, rows)) = terminal::size() {
    println!("Terminal is {} cols × {} rows", cols, rows);
}

// Check color support (respects NO_COLOR and TERM=dumb)
if terminal::supports_color() {
    // render with colors
} else {
    // render plain text
}

size() uses an ioctl call on Unix and GetConsoleScreenBufferInfo on Windows, falling back to the COLUMNS/LINES environment variables.

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Color Support

Mode	Color variant	ANSI codes	Notes
Standard (16)	Black … White	30–37 / 40–47	Most portable
Bright (16)	BrightBlack … BrightWhite	90–97 / 100–107	Widely supported
256-color	Fixed(0..=255)	38;5;n / 48;5;n	Modern terminals
Truecolor (RGB)	Rgb(r, g, b)	38;2;r;g;b / 48;2;r;g;b	xterm-256, iTerm2, Kitty, Alacritty, Windows Terminal

Recommendation: use terminal::supports_color() to detect basic support and feature-detect COLORTERM=truecolor (or truecolor/24bit in TERM) if you need to gate RGB output.

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API Documentation

Full API documentation is available on docs.rs/blazer.

To generate and browse it locally:

cargo doc --open

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Examples

Runnable examples live in the examples/ directory:

cargo run --example basic_colors   # Color and style showcase

cargo run --example progress_bar   # Animated progress bar

cargo run --example spinner_demo   # Background spinner

cargo run --example table_demo     # Box-drawn table

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Terminal Compatibility

Terminal / Environment	Status
Windows Terminal	✅ Full support
iTerm2 (macOS)	✅ Full support
Alacritty	✅ Full support
Kitty	✅ Full support
GNOME Terminal	✅ Full support
xterm-256color	✅ Full support
VS Code integrated terminal	✅ Full support
cmd.exe / legacy conhost	⚠️ Basic colors
dumb / NO_COLOR set	⚠️ Plain text
CI (GitHub Actions, etc.)	⚠️ Basic colors

When in doubt, call terminal::supports_color() and degrade gracefully.

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MSRV

The minimum supported Rust version is 1.70.

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Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-thing)
3. Run cargo fmt, cargo clippy, and cargo test
4. Open a pull request

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License

Licensed under the MIT License.