Lots more restaurant stuff regarding modules

restaurant/src/lib.rs

@@ -20,14 +20,85 @@
 //
 
 mod front_of_house {
-    mod hosting {
-        fn add_to_waitlist() {}
+    pub mod hosting {
+        pub fn add_to_waitlist() {}
         fn seat_at_table() {}
     }
 
     mod serving {
         fn take_order() {}
-        fn serve_order() {}
         fn take_payment() {}
+
+    }
+}
+
+fn serve_order() {}
+
+mod back_of_house {
+    pub struct Breakfast {
+        pub toast: String,
+        seasonal_fruit: String,
+    }
+
+    impl Breakfast {
+        pub fn summer(toast: &str) -> Breakfast {
+            Breakfast {
+                toast: String::from(toast),
+                seasonal_fruit: String::from("peaches"),
+            }
+        }
+    }
+
+    pub enum Appetizer {
+        Soup,
+        Salad,
     }
+
+    fn fix_incorrect_order() {
+        cook_order();
+        super::serve_order();
+    }
+
+    fn cook_order() {}
+}
+
+// Either absolute:
+// use crate::front_of_house::hosting;
+// or relaive:
+use front_of_house::hosting;
+// we can also provide new names...
+use crate::front_of_house::hosting as host;
+// Public definitions braught into scope with use are
+// private in this scope except we use «pub use»
+pub use front_of_house::hosting as pubhost;
+
+pub fn eat_at_restaurant() {
+    // Absolute path
+    crate::front_of_house::hosting::add_to_waitlist();
+
+    // Relative path
+    front_of_house::hosting::add_to_waitlist();
+
+    // With use'd path
+    hosting::add_to_waitlist();
+
+    // With renamed used path
+    host::add_to_waitlist();
+
+    pubhost::add_to_waitlist();
+
+    // Order a breakfast in the summer with Rye toast
+    let mut meal = back_of_house::Breakfast::summer("Rye");
+
+    // Change our mind about what bread we'd like
+    meal.toast = String::from("Wheat");
+
+    println!("I'd like {} toast please", meal.toast);
+
+    // The next line won't compile if we uncomment it; we're not allowed
+    // to see or modify the seasonal fruit that comes with the meal
+    // meal.seasonal_fruit = String::from("blueberries");
+
+    let order1 = back_of_house::Appetizer::Soup;
+    let order2 = back_of_house::Appetizer::Salad;
 }