Detects whether a terminal supports color, and gives details about that support

Related tags

Command-line supports-color
Overview

Detects whether a terminal supports color, and gives details about that support. It takes into account the NO_COLOR environment variable.

This crate is a Rust port of @sindresorhus' NPM package by the same name.

Example

use supports_color::Stream;

if let Some(support) = supports_color::on(Stream::Stdout) {
    if support.has_16m {
        println!("16 million (RGB) colors are supported");
    } else if support.has_256 {
        println!("256-bit colors are supported.");
    } else if support.has_basic {
        println!("Only basic ANSI colors are supported.");
    }
} else {
    println!("No color support.");
}
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Comments
  • `atty` is potentially unsound, not very alive and should be replaced with `is-terminal`

    `atty` is potentially unsound, not very alive and should be replaced with `is-terminal`

    Some links explaining the problem

    • https://github.com/softprops/atty/pull/51
    • https://github.com/clap-rs/clap/pull/4249#discussion_r1029107456
    • https://github.com/rustsec/advisory-db/issues/1457

    I can prepare a pull request if you like

    opened by pacak 2
  • Various improvements

    Various improvements

    This PR removes some string allocations in the supports_color function.

    I originally wanted to use Result::as_deref for this, but since I wasn't sure what the minimum supported Rust version is, and Result::as_deref is only available since 1.47, I just wrote a helper function instead.

    Other changes:

    • I removed min since it is guaranteed to be 0 everywhere where it is used
    • I reordered some code paths to do less work by returning earlier if FORCE_COLOR or NO_COLOR is set
    • I fixed the tests, which were flaky; cargo runs tests in parallel, which does not work properly if multiple tests read and write environment variables. The solution was to add a lock that ensures the tests run sequentially.
    opened by Aloso 2
  • Ignore unit tests on GH action

    Ignore unit tests on GH action

    I just realized that the unit-tests is much trickier than it looks.

    1. GH action does not play nice with atty::is. Unit-tests couldn't be run in CI reliably.
    2. Cargo run tests in parallel by default, and this affects reliability of the unit-test. Unit-test should be run with cargo test -- --test-threads=1. Mght want to put this information somewhere. Another option is to remove unit-test altogether.
    opened by dswij 1
Releases(v1.3.1)
Owner
Kat Marchán
rustacean 🦀, @NuGet team 🍫. Formerly @npmjs 😩
Kat Marchán
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