Update terminal-colorsaurus to 0.4.0

Excerpt from the [changelog](https://github.com/bash/terminal-colorsaurus/blob/0.4.0/changelog.md):

> * ⚡ Renamed «color scheme» to «color palette».
> * ⚡ Removed `is_dark_on_light` and `is_light_on_dark` functions. Use `color_scheme` instead.
> * Add new convenience function `color_scheme` which returns a nice `Dark / Light` enum.
> * Add support for urxvt's `rgba:` color format.
> * Further refined the documentation (more organized terminal list, new terminals tested).
> * Improved handling of ambigous color palettes (e.g. when background color is the same as foreground).
> * Queries are now terminated with `ST` (the standard string terminator) instead of `BEL` (which is an xterm extension).

Cargo.lock

@@ -1323,9 +1323,9 @@ dependencies = [
 
 [[package]]
 name = "terminal-colorsaurus"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a11d4fd698c3b697b6f712fa75f62f7b15119f41b0bb660741dd02297f534d78"
+checksum = "fc3b74af7c844e628c5dafa421ec59283e9f0bed5cb49956439316ec6d8728f1"
 dependencies = [
  "libc",
  "memchr",

Cargo.toml

@@ -68,7 +68,7 @@ bytesize = { version = "1.3.0" }
 encoding_rs = "0.8.33"
 os_str_bytes = { version = "~7.0", optional = true }
 run_script = { version = "^0.10.1", optional = true}
-terminal-colorsaurus = { version = "0.3.3" }
+terminal-colorsaurus = { version = "0.4.0" }
 
 [dependencies.git2]
 version = "0.18"

src/theme.rs

@@ -92,6 +92,15 @@ pub enum ColorScheme {
     Light,
 }
 
+impl From<terminal_colorsaurus::ColorScheme> for ColorScheme {
+    fn from(scheme: terminal_colorsaurus::ColorScheme) -> Self {
+        match scheme {
+            terminal_colorsaurus::ColorScheme::Dark => ColorScheme::Dark,
+            terminal_colorsaurus::ColorScheme::Light => ColorScheme::Light,
+        }
+    }
+}
+
 fn theme_from_detector(options: ThemeOptions, detector: &dyn ColorSchemeDetector) -> String {
     // Implementation note: This function is mostly pure (i.e. it has no side effects) for the sake of testing.
     // All the side effects (e.g. querying the terminal for its colors) are performed in the detector.
@@ -145,12 +154,9 @@ impl ColorSchemeDetector for TerminalColorSchemeDetector {
 
     fn detect(&self) -> Option<ColorScheme> {
         use terminal_colorsaurus::{color_scheme, QueryOptions};
-        let colors = color_scheme(QueryOptions::default()).ok()?;
-        if colors.is_light_on_dark() {
-            Some(ColorScheme::Dark)
-        } else {
-            Some(ColorScheme::Light)
-        }
+        color_scheme(QueryOptions::default())
+            .map(ColorScheme::from)
+            .ok()
     }
 }