feat: add add/remove-class subcommand to wc command

crates/ewwii/src/app.rs

@@ -820,6 +820,36 @@ impl<B: DisplayBackend> App<B> {
                     log::error!("Failed to acquire lock on widget registry");
                 }
             }
+            crate::opts::WidgetControlAction::AddClass { class, widget_name } => {
+                if let Ok(mut maybe_registry) = self.widget_reg_store.lock() {
+                    if let Some(widget_registry) = maybe_registry.as_mut() {
+                        widget_registry.update_class_of_widget_by_name(
+                            &widget_name,
+                            &class,
+                            false,
+                        );
+                    } else {
+                        log::error!("Widget registry is empty");
+                    }
+                } else {
+                    log::error!("Failed to acquire lock on widget registry");
+                }
+            }
+            crate::opts::WidgetControlAction::RemoveClass { class, widget_name } => {
+                if let Ok(mut maybe_registry) = self.widget_reg_store.lock() {
+                    if let Some(widget_registry) = maybe_registry.as_mut() {
+                        widget_registry.update_class_of_widget_by_name(
+                            &widget_name,
+                            &class,
+                            true,
+                        );
+                    } else {
+                        log::error!("Widget registry is empty");
+                    }
+                } else {
+                    log::error!("Failed to acquire lock on widget registry");
+                }
+            }
         }
 
         Ok(())

crates/ewwii/src/opts.rs

@@ -272,6 +272,26 @@ pub enum WidgetControlAction {
         #[arg(long = "widget", short = 'w')]
         widget_name: String,
     },
+
+    /// Add a class to a widget with given name
+    AddClass {
+        /// The class to add to the widget
+        class: String,
+
+        /// Name of the widget to add class to
+        #[arg(long = "widget", short = 'w')]
+        widget_name: String,
+    },
+
+    /// Remove a class to a widget with given name
+    RemoveClass {
+        /// The class to remove from the widget
+        class: String,
+
+        /// Name of the widget to remove class from
+        #[arg(long = "widget", short = 'w')]
+        widget_name: String,
+    },
 }
 
 impl Opt {

crates/ewwii/src/widgets/widget_definitions.rs

@@ -257,6 +257,29 @@ impl WidgetRegistry {
 
         false
     }
+
+    pub fn update_class_of_widget_by_name(
+        &mut self,
+        widget_name: &str,
+        class: &str,
+        remove: bool,
+    ) -> bool {
+        if let Some((&id, _)) = self
+            .widgets
+            .iter()
+            .find(|(_, entry)| entry.widget.widget_name().as_str() == widget_name)
+        {
+            if let Some(entry) = self.widgets.get(&id) {
+                if !remove {
+                    entry.widget.style_context().add_class(class);
+                } else {
+                    entry.widget.style_context().remove_class(class);
+                }
+            }
+        }
+
+        false
+    }
 }
 
 pub(super) fn build_gtk_box(