Make the default macOS theme depend on Dark Mode

We frequently get complaints from macOS users that bat does not work on
their default macOS terminal background, which is white.

Pay the price of slightly increased startup time to get a better default
on macOS. To avoid the slightly increased startup time, simply specify a
theme explicitly via `--theme`, `BAT_THEME`, or `~/.config/bat`.

src/assets.rs

@@ -69,10 +69,56 @@ impl HighlightingAssets {
         }
     }
 
+    /// The default theme.
+    ///
+    /// ### Windows and Linux
+    ///
+    /// Windows and most Linux distributions has a dark terminal theme by
+    /// default. On these platforms, this function always returns a theme that
+    /// looks good on a dark background.
+    ///
+    /// ### macOS
+    ///
+    /// On macOS the default terminal background is light, but it is common that
+    /// Dark Mode active, which makes the terminal background dark. On this
+    /// platform, the default theme depends on
+    /// ```bash
+    /// defaults read -globalDomain AppleInterfaceStyle
+    /// ````
+    /// To avoid the overhead of the check on macOS, simply specify a theme
+    /// explicitly via `--theme`, `BAT_THEME`, or `~/.config/bat`.
+    ///
+    /// See <https://github.com/sharkdp/bat/issues/1746> and
+    /// <https://github.com/sharkdp/bat/issues/1928> for more context.
     pub fn default_theme() -> &'static str {
+        #[cfg(not(target_os = "macos"))]
+        {
+            Self::default_dark_theme()
+        }
+        #[cfg(target_os = "macos")]
+        {
+            if macos_dark_mode_active() {
+                Self::default_dark_theme()
+            } else {
+                Self::default_light_theme()
+            }
+        }
+    }
+
+    /**
+     * The default theme that looks good on a dark background.
+     */
+    fn default_dark_theme() -> &'static str {
         "Monokai Extended"
     }
 
+    /**
+     * The default theme that looks good on a light background.
+     */
+    fn default_light_theme() -> &'static str {
+        "Monokai Extended Light"
+    }
+
     pub fn from_cache(cache_path: &Path) -> Result<Self> {
         Ok(HighlightingAssets::new(
             SerializedSyntaxSet::FromFile(cache_path.join("syntaxes.bin")),
@@ -352,6 +398,16 @@ fn asset_from_cache<T: serde::de::DeserializeOwned>(
         .map_err(|_| format!("Could not parse cached {}", description).into())
 }
 
+#[cfg(target_os = "macos")]
+fn macos_dark_mode_active() -> bool {
+    let mut defaults_cmd = std::process::Command::new("defaults");
+    defaults_cmd.args(&["read", "-globalDomain", "AppleInterfaceStyle"]);
+    match defaults_cmd.output() {
+        Ok(output) => output.stdout == b"Dark\n",
+        _ => false,
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;