format request, begin download feature implementation

src/app/browser/window/tab/item/page/request.rs

@@ -0,0 +1,34 @@
+use gtk::glib::{Uri, UriFlags};
+
+/// Request type for `Page` with optional value parsed
+pub enum Request {
+    Default(Uri),
+    Download(Uri),
+    Source(Uri),
+    Search(String),
+}
+
+impl Request {
+    // Constructors
+
+    /// Create new `Self` from `request` string
+    pub fn from(request: &str) -> Self {
+        if let Some(postfix) = request.strip_prefix("source:") {
+            if let Ok(uri) = Uri::parse(postfix, UriFlags::NONE) {
+                return Self::Source(uri);
+            }
+        }
+
+        if let Some(postfix) = request.strip_prefix("download:") {
+            if let Ok(uri) = Uri::parse(postfix, UriFlags::NONE) {
+                return Self::Download(uri);
+            }
+        }
+
+        if let Ok(uri) = Uri::parse(request, UriFlags::NONE) {
+            return Self::Default(uri);
+        }
+
+        Self::Search(request.to_string())
+    }
+}