Respect --detect-color-scheme flag when listing themes

src/bin/bat/app.rs

@@ -427,7 +427,16 @@ impl App {
             .matches
             .get_one::<String>("theme-light")
             .map(|t| ThemeRequest::from_str(t).unwrap());
-        let detect_color_scheme = match self
+        ThemeOptions {
+            theme,
+            theme_dark,
+            theme_light,
+            detect_color_scheme: self.detect_color_scheme(),
+        }
+    }
+
+    pub(crate) fn detect_color_scheme(&self) -> DetectColorScheme {
+        match self
             .matches
             .get_one::<String>("detect-color-scheme")
             .map(|s| s.as_str())
@@ -436,12 +445,6 @@ impl App {
             Some("never") => DetectColorScheme::Never,
             Some("always") => DetectColorScheme::Always,
             _ => unreachable!("other values for --detect-color-scheme are not allowed"),
-        };
-        ThemeOptions {
-            theme,
-            theme_dark,
-            theme_light,
-            detect_color_scheme,
         }
     }
 }

src/bin/bat/main.rs

@@ -189,7 +189,12 @@ fn theme_preview_file<'a>() -> Input<'a> {
     Input::from_reader(Box::new(BufReader::new(THEME_PREVIEW_DATA)))
 }
 
-pub fn list_themes(cfg: &Config, config_dir: &Path, cache_dir: &Path) -> Result<()> {
+pub fn list_themes(
+    cfg: &Config,
+    config_dir: &Path,
+    cache_dir: &Path,
+    detect_color_scheme: DetectColorScheme,
+) -> Result<()> {
     let assets = assets_from_cache_or_binary(cfg.use_custom_assets, cache_dir)?;
     let mut config = cfg.clone();
     let mut style = HashSet::new();
@@ -200,7 +205,7 @@ pub fn list_themes(cfg: &Config, config_dir: &Path, cache_dir: &Path) -> Result<
     let stdout = io::stdout();
     let mut stdout = stdout.lock();
 
-    let default_theme_name = default_theme(color_scheme(DetectColorScheme::Auto));
+    let default_theme_name = default_theme(color_scheme(detect_color_scheme));
     for theme in assets.themes() {
         let default_theme_info = if default_theme_name == theme {
             " (default)"
@@ -375,7 +380,7 @@ fn run() -> Result<bool> {
                 };
                 run_controller(inputs, &plain_config, cache_dir)
             } else if app.matches.get_flag("list-themes") {
-                list_themes(&config, config_dir, cache_dir)?;
+                list_themes(&config, config_dir, cache_dir, app.detect_color_scheme())?;
                 Ok(true)
             } else if app.matches.get_flag("config-file") {
                 println!("{}", config_file().to_string_lossy());