From 9db6ac8f202ebdc1453edee01da0b30aee0949d8 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector@hecrj.dev>
Date: Tue, 19 Mar 2024 23:58:17 +0100
Subject: Introduce `auto-detect-theme` feature

---
 core/src/theme.rs | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

(limited to 'core/src')

diff --git a/core/src/theme.rs b/core/src/theme.rs
index 948aaf83..6b2c04da 100644
--- a/core/src/theme.rs
+++ b/core/src/theme.rs
@@ -7,10 +7,9 @@ use std::fmt;
 use std::sync::Arc;
 
 /// A built-in theme.
-#[derive(Debug, Clone, PartialEq, Default)]
+#[derive(Debug, Clone, PartialEq)]
 pub enum Theme {
     /// The built-in light variant.
-    #[default]
     Light,
     /// The built-in dark variant.
     Dark,
@@ -161,6 +160,28 @@ impl Theme {
     }
 }
 
+impl Default for Theme {
+    fn default() -> Self {
+        #[cfg(feature = "auto-detect-theme")]
+        {
+            use once_cell::sync::Lazy;
+
+            static DEFAULT: Lazy<Theme> =
+                Lazy::new(|| match dark_light::detect() {
+                    dark_light::Mode::Dark => Theme::Dark,
+                    dark_light::Mode::Light | dark_light::Mode::Default => {
+                        Theme::Light
+                    }
+                });
+
+            DEFAULT.clone()
+        }
+
+        #[cfg(not(feature = "auto-detect-theme"))]
+        Theme::Light
+    }
+}
+
 impl fmt::Display for Theme {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-- 
cgit