:feat: Add hooks for mode and layout changes

src/app.rs

@@ -381,8 +381,8 @@ impl App {
         self.msg_out.push_back(MsgOut::Enque(task));
         self
     }
-
-    pub fn handle_batch_external_msgs(mut self, msgs: Vec<ExternalMsg>) -> Result<Self> {
+    
+    pub fn handle_batch_external_msgs(self, msgs: Vec<ExternalMsg>) -> Result<Self> {
         for task in msgs
             .into_iter()
             .map(|msg| Task::new(MsgIn::External(msg), None))
@@ -1112,6 +1112,13 @@ impl App {
                 self.config.general.read_only,
                 self.config.general.global_key_bindings.to_owned(),
             );
+             
+            // Hooks
+            if !self.hooks.on_mode_switch.is_empty() {
+                let msgs = self.hooks.on_mode_switch.clone();
+                self = self.handle_batch_external_msgs(msgs)?
+            }
+
             Ok(self)
         } else {
             self.log_error(format!("Mode not found: {}", mode))
@@ -1130,6 +1137,13 @@ impl App {
                 self.config.general.read_only,
                 self.config.general.global_key_bindings.to_owned(),
             );
+            
+            // Hooks
+            if !self.hooks.on_mode_switch.is_empty() {
+                let msgs = self.hooks.on_mode_switch.clone();
+                self = self.handle_batch_external_msgs(msgs)?
+            }
+
             Ok(self)
         } else {
             self.log_error(format!("Builtin mode not found: {}", mode))
@@ -1148,6 +1162,13 @@ impl App {
                 self.config.general.read_only,
                 self.config.general.global_key_bindings.to_owned(),
             );
+
+            // Hooks
+            if !self.hooks.on_mode_switch.is_empty() {
+                let msgs = self.hooks.on_mode_switch.clone();
+                self = self.handle_batch_external_msgs(msgs)?
+            }
+
             Ok(self)
         } else {
             self.log_error(format!("Custom mode not found: {}", mode))
@@ -1157,6 +1178,13 @@ impl App {
     fn switch_layout(mut self, layout: &str) -> Result<Self> {
         if let Some(l) = self.config.layouts.get(layout) {
             self.layout = l.to_owned();
+            
+            // Hooks
+            if !self.hooks.on_layout_switch.is_empty() {
+                let msgs = self.hooks.on_layout_switch.clone();
+                self = self.handle_batch_external_msgs(msgs)?
+            }
+
             Ok(self)
         } else {
             self.log_error(format!("Layout not found: {}", layout))
@@ -1166,6 +1194,13 @@ impl App {
     fn switch_layout_builtin(mut self, layout: &str) -> Result<Self> {
         if let Some(l) = self.config.layouts.builtin.get(layout) {
             self.layout = l.to_owned();
+            
+            // Hooks
+            if !self.hooks.on_layout_switch.is_empty() {
+                let msgs = self.hooks.on_layout_switch.clone();
+                self = self.handle_batch_external_msgs(msgs)?
+            }
+
             Ok(self)
         } else {
             self.log_error(format!("Builtin layout not found: {}", layout))
@@ -1175,6 +1210,13 @@ impl App {
     fn switch_layout_custom(mut self, layout: &str) -> Result<Self> {
         if let Some(l) = self.config.layouts.get_custom(layout) {
             self.layout = l.to_owned();
+            
+            // Hooks
+            if !self.hooks.on_layout_switch.is_empty() {
+                let msgs = self.hooks.on_layout_switch.clone();
+                self = self.handle_batch_external_msgs(msgs)?
+            }
+
             Ok(self)
         } else {
             self.log_error(format!("Custom layout not found: {}", layout))

src/config.rs

@@ -624,6 +624,12 @@ pub struct Hooks {
 
     #[serde(default)]
     pub on_focus_change: Vec<ExternalMsg>,
+
+    #[serde(default)]
+    pub on_mode_switch: Vec<ExternalMsg>,
+
+    #[serde(default)]
+    pub on_layout_switch: Vec<ExternalMsg>,
     // TODO After cleanup or Runner::run
     // #[serde(default)]
     // pub before_quit: Vec<ExternalMsg>,
@@ -634,6 +640,8 @@ impl Hooks {
         self.on_load.extend(other.on_load);
         self.on_directory_change.extend(other.on_directory_change);
         self.on_focus_change.extend(other.on_focus_change);
+        self.on_mode_switch.extend(other.on_mode_switch);
+        self.on_layout_switch.extend(other.on_layout_switch);
         self
     }
 }