1 files changed, 104 insertions, 0 deletions
diff --git a/vendor/concolor-override/src/lib.rs b/vendor/concolor-override/src/lib.rs
new file mode 100644
index 000000000..8a1bfc09e
--- /dev/null
+++ b/vendor/concolor-override/src/lib.rs
@@ -0,0 +1,104 @@
+//! Global override of color control
+
+#![cfg_attr(not(test), no_std)]
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+
+/// Selection for overriding color output with [`set`][crate::set]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum ColorChoice {
+    Auto,
+    AlwaysAnsi,
+    Always,
+    Never,
+}
+
+impl Default for ColorChoice {
+    fn default() -> Self {
+        Self::Auto
+    }
+}
+
+/// Get the current [`ColorChoice`] state
+pub fn get() -> ColorChoice {
+    USER.get()
+}
+
+/// Override the detected [`ColorChoice`]
+pub fn set(choice: ColorChoice) {
+    USER.set(choice)
+}
+
+static USER: AtomicChoice = AtomicChoice::new();
+
+#[derive(Debug)]
+pub(crate) struct AtomicChoice(AtomicUsize);
+
+impl AtomicChoice {
+    pub(crate) const fn new() -> Self {
+        Self(AtomicUsize::new(Self::from_choice(
+            crate::ColorChoice::Auto,
+        )))
+    }
+
+    pub(crate) fn get(&self) -> crate::ColorChoice {
+        let choice = self.0.load(Ordering::SeqCst);
+        Self::to_choice(choice).unwrap()
+    }
+
+    pub(crate) fn set(&self, choice: crate::ColorChoice) {
+        let choice = Self::from_choice(choice);
+        self.0.store(choice, Ordering::SeqCst);
+    }
+
+    const fn from_choice(choice: crate::ColorChoice) -> usize {
+        match choice {
+            crate::ColorChoice::Auto => 0,
+            crate::ColorChoice::AlwaysAnsi => 1,
+            crate::ColorChoice::Always => 2,
+            crate::ColorChoice::Never => 3,
+        }
+    }
+
+    const fn to_choice(choice: usize) -> Option<crate::ColorChoice> {
+        match choice {
+            0 => Some(crate::ColorChoice::Auto),
+            1 => Some(crate::ColorChoice::AlwaysAnsi),
+            2 => Some(crate::ColorChoice::Always),
+            3 => Some(crate::ColorChoice::Never),
+            _ => None,
+        }
+    }
+}
+
+impl Default for AtomicChoice {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn choice_serialization() {
+        let expected = vec![
+            ColorChoice::Auto,
+            ColorChoice::AlwaysAnsi,
+            ColorChoice::Always,
+            ColorChoice::Never,
+        ];
+        let values: Vec<_> = expected
+            .iter()
+            .cloned()
+            .map(AtomicChoice::from_choice)
+            .collect();
+        let actual: Vec<_> = values
+            .iter()
+            .cloned()
+            .filter_map(AtomicChoice::to_choice)
+            .collect();
+        assert_eq!(expected, actual);
+    }
+}