Reworking elements to implement the Builder pattern

src/html/mod.rs

@@ -10,6 +10,28 @@ pub(crate) struct Page {
     body: Vec<Box<dyn Render>>,
 }
 
+pub(crate) struct PageBuilder {
+    title: Option<String>,
+    head: Option<Vec<Box<dyn Render>>>
+    body: Option<Vec<Box<dyn Render>>>
+}
+
+impl PageBuilder {
+    pub(crate) fn new() -> Self {
+        Self {
+            title: None,
+            head: None,
+            body: None,
+        }
+    }
+
+    pub(crate) fn title<T>(mut self, title: T)
+    where T: Into<String>
+    {
+        self.title = Some(title.into());
+    }
+}
+
 impl Render for Vec<Box<dyn Render>> {
     fn render(&self) -> String {
         let mut result = String::new();
@@ -45,6 +67,10 @@ impl Render for Page {
 }
 
 impl Page {
+    pub(crate) fn builder() -> PageBuilder {
+        PageBuilder::new()
+    }
+
     pub(crate) fn new<T>(title: T) -> Self
     where
         T: Into<String>,