53 lines
1.6 KiB
Rust
53 lines
1.6 KiB
Rust
use std::{
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env,
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sync::{LazyLock, OnceLock},
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};
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#[allow(unused_imports)]
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use crate::prelude::*;
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/// The actual, final value for whether color should be used, based on CLI and environment values.
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pub static SHOULD_COLOR: LazyLock<bool> = LazyLock::new(|| is_clicolor_forced() || is_color_reqd());
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/// Initialized from the `--color` value from the CLI, along with `io::stdin().is_terminal()`.
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pub static _CLI_ENABLE_COLOR: OnceLock<bool> = OnceLock::new();
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fn is_color_reqd() -> bool {
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_CLI_ENABLE_COLOR.get().copied().unwrap_or(false)
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}
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fn is_clicolor_forced() -> bool {
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env::var("CLICOLOR_FORCE")
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.map(|value| {
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if value.is_empty() || value == "0" {
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false
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} else {
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true
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}
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})
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.unwrap_or(false)
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}
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/// Silly wrapper around LazyLock<&'static str> to impl Display.
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pub(crate) struct _LazyLockDisplay(LazyLock<&'static str>);
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impl Display for _LazyLockDisplay {
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fn fmt(&self, f: &mut Formatter) -> FmtResult {
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Display::fmt(&*self.0, f)
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}
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}
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pub(crate) const ANSI_GREEN: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
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SHOULD_COLOR.then_some("\x1b[32m").unwrap_or_default()
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}));
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pub(crate) const ANSI_MAGENTA: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
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SHOULD_COLOR.then_some("\x1b[35m").unwrap_or_default()
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}));
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pub(crate) const ANSI_CYAN: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
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SHOULD_COLOR.then_some("\x1b[36m").unwrap_or_default()
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}));
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pub(crate) const ANSI_RESET: _LazyLockDisplay = _LazyLockDisplay(LazyLock::new(|| {
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SHOULD_COLOR.then_some("\x1b[0m").unwrap_or_default()
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}));
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