implement base button sensitivity update

src/browser/main/tab/page/navigation.rs

@@ -65,7 +65,7 @@ impl Navigation {
 
     // Actions
     pub fn update(&self) {
-        self.base.update();
+        self.base.update(self.request.uri());
         self.history.update();
         self.reload.update(!self.request.is_empty());
         self.request.update();

src/browser/main/tab/page/navigation/base.rs

@@ -1,4 +1,4 @@
-use gtk::Button;
+use gtk::{glib::Uri, prelude::WidgetExt, Button};
 
 pub struct Base {
     widget: Button,
@@ -18,8 +18,11 @@ impl Base {
     }
 
     // Actions
-    pub fn update(&self) {
+    pub fn update(&self, uri: Option<Uri>) {
-        // @TODO
+        self.widget.set_sensitive(match uri {
+            Some(uri) => "/" != uri.path(),
+            None => false,
+        });
     }
 
     // Getters

src/browser/main/tab/page/navigation/request.rs

@@ -1,5 +1,5 @@
 use gtk::{
-    glib::GString,
+    glib::{GString, Uri, UriFlags},
     prelude::{EditableExt, EntryExt, WidgetExt},
     Entry,
 };
@@ -66,4 +66,11 @@ impl Request {
     pub fn text(&self) -> GString {
         self.widget.text()
     }
+
+    pub fn uri(&self) -> Option<Uri> {
+        match Uri::parse(&self.widget.text(), UriFlags::NONE) {
+            Ok(uri) => Some(uri),
+            _ => None,
+        }
+    }
 }