dynix/src/color.rs

// SPDX-FileCopyrightText: 2026 Qyriad <qyriad@qyriad.me>
//
// SPDX-License-Identifier: EUPL-1.1

use std::{
    env,
    sync::{LazyLock, OnceLock},
};

#[allow(unused_imports)]
use crate::prelude::*;

/// The actual, final value for whether color should be used, based on CLI and environment values.
pub static SHOULD_COLOR: LazyLock<bool> = LazyLock::new(|| is_clicolor_forced() || is_color_reqd());

/// Initialized from the `--color` value from the CLI, along with `io::stdin().is_terminal()`.
pub static _CLI_ENABLE_COLOR: OnceLock<bool> = OnceLock::new();

fn is_color_reqd() -> bool {
    _CLI_ENABLE_COLOR.get().copied().unwrap_or(false)
}

fn is_clicolor_forced() -> bool {
    env::var("CLICOLOR_FORCE")
        .map(|value| {
            if value.is_empty() || value == "0" {
                false
            } else {
                true
            }
        })
        .unwrap_or(false)
}

/// Silly wrapper around LazyLock<&'static str> to impl Display.
pub(crate) struct _LazyLockDisplay(LazyLock<&'static str>);
impl Display for _LazyLockDisplay {
    fn fmt(&self, f: &mut Formatter) -> FmtResult {
        Display::fmt(&*self.0, f)
    }
}

pub(crate) const ANSI_GREEN: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
    SHOULD_COLOR.then_some("\x1b[32m").unwrap_or_default()
}));

pub(crate) const ANSI_MAGENTA: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
    SHOULD_COLOR.then_some("\x1b[35m").unwrap_or_default()
}));

pub(crate) const ANSI_CYAN: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
    SHOULD_COLOR.then_some("\x1b[36m").unwrap_or_default()
}));

pub(crate) const ANSI_RESET: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
    SHOULD_COLOR.then_some("\x1b[0m").unwrap_or_default()
}));