Small style changes to --list-themes

assets/theme_preview.rs

@@ -1,5 +1,5 @@
-// Output the square of a number.
-fn print_square(num: f64) {
-    let result = f64::powf(num, 2.0);
-    println!("The square of {:.2} is {:.2}.", num, result);
-}
+  // Output the square of a number.
+  fn print_square(num: f64) {
+      let result = f64::powf(num, 2.0);
+      println!("The square of {:.2} is {:.2}.", num, result);
+  }

src/main.rs

@@ -139,10 +139,10 @@ pub fn list_themes(assets: &HighlightingAssets, cfg: &Config) {
     config.files = vec![Some("assets/theme_preview.rs")];
     config.output_components = OutputComponents(style);
     for (theme, _) in themes.iter() {
-        println!("{}\n", Style::new().bold().paint(theme.to_string()));
+        println!("Theme: {}\n", Style::new().bold().paint(theme.to_string()));
         config.theme = theme.to_string();
         let _controller = Controller::new(&config, &assets).run();
-        println!("--------------------------------\n");
+        println!()
     }
 }