restore old files now!

src/color.rs

@@ -0,0 +1,53 @@
+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()
+}));