Update examples

.idea/micronfig.iml

@@ -7,9 +7,11 @@
       <sourceFolder url="file://$MODULE_DIR$/examples/e01_the_cave/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/examples/e02_quick_math/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/examples/e03_order_a_pizza/src" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/examples/e01_the_cave/target" />
       <excludeFolder url="file://$MODULE_DIR$/examples/e02_quick_math/target" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
+      <excludeFolder url="file://$MODULE_DIR$/examples/e03_order_a_pizza/target" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />

examples/e01_the_cave/src/main.rs

@@ -1,9 +1,9 @@
 use std::fmt::{Display, Formatter};
 use std::str::FromStr;
 
+
 fn main() {
-    let echo: String = micronfig::get("ECHO")
+    let echo: String = micronfig::required("ECHO");
-        .expect("ECHO configuration value to be defined");
 
     println!("ECHOing back: {echo}");
 }

examples/e02_quick_math/src/main.rs

@@ -1,6 +1,23 @@
 use std::fmt::{Display, Formatter};
 use std::str::FromStr;
 
+
+fn main() {
+    let first: u64 = micronfig::required("FIRST");
+    let second: u64 = micronfig::required("SECOND");
+    let operator: Operator = micronfig::required("OPERATOR");
+
+    let result = match operator {
+        Operator::Sum => first + second,
+        Operator::Subtraction => first - second,
+        Operator::Multiplication => first * second,
+        Operator::Division => first / second,
+    };
+
+    println!("{first} {operator} {second} = {result}")
+}
+
+
 pub enum Operator {
     Sum,
     Subtraction,
@@ -32,21 +49,3 @@ impl Display for Operator {
         })
     }
 }
-
-fn main() {
-    let first: u64 = micronfig::get("FIRST")
-        .expect("FIRST operand to be properly defined");
-    let second: u64 = micronfig::get("SECOND")
-        .expect("SECOND operand to be properly defined");
-    let operator: Operator = micronfig::get("OPERATOR")
-        .expect("OPERATOR to be properly defined");
-
-    let result = match operator {
-        Operator::Sum => first + second,
-        Operator::Subtraction => first - second,
-        Operator::Multiplication => first * second,
-        Operator::Division => first / second,
-    };
-
-    println!("{first} {operator} {second} = {result}")
-}

examples/e03_order_a_pizza/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "e03_order_a_pizza"
+description = "Order a pizza using micronfig!"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+micronfig = { path = "../.." }

examples/e03_order_a_pizza/src/main.rs

@@ -0,0 +1,114 @@
+use std::fmt::Formatter;
+use std::net::IpAddr;
+use std::str::FromStr;
+
+fn main() {
+    // The name of the person who ordered the pizza.
+    let full_name: String = micronfig::required("FULLNAME");
+
+    // The (IP) address the pizza should be delivered to.
+    let destination: IpAddr = micronfig::required("DESTINATION");
+
+    // The base of the pizza to add toppings on.
+    let pizza_base: PizzaBase = micronfig::required("PIZZABASE");
+
+    // The toppings to add to the pizza.
+    let pizza_toppings: PizzaToppingsList = micronfig::optional("PIZZATOPPINGS")
+        .unwrap_or_else(|| PizzaToppingsList{ list: vec![] });
+
+    // Let's print the order!
+    println!("Pizza Order");
+    println!("===========");
+    println!();
+    println!("Base:");
+    println!("- {}", &pizza_base);
+    println!();
+    println!("Toppings:");
+    for topping in pizza_toppings.list {
+        println!("- {}", &topping);
+    };
+    println!();
+    println!("Deliver to:");
+    println!("{} @ {}", &full_name, &destination)
+}
+
+
+/// A possible base of pizza.
+enum PizzaBase {
+    /// Just the pizza dough, with nothing else on top of it.
+    Blank,
+    /// Pizza dough with tomato on top.
+    Red,
+    /// Pizza dough with mozzarella on top.
+    White,
+    /// Pizza dough with both tomato and mozzarella on top.
+    Margherita,
+}
+
+impl FromStr for PizzaBase {
+    type Err = &'static str;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.to_lowercase().as_str() {
+            // Italian
+            "vuota" => Ok(Self::Blank),
+            "stria" => Ok(Self::Blank),
+            "rossa" => Ok(Self::Red),
+            "marinara" => Ok(Self::Red),
+            "pomodoro" => Ok(Self::Red),
+            "bianca" => Ok(Self::White),
+            "mozzarella" => Ok(Self::White),
+            "regina" => Ok(Self::Margherita),
+            "margherita" => Ok(Self::Margherita),
+            "normale" => Ok(Self::Margherita),
+            "entrambi" => Ok(Self::Margherita),
+            // English
+            "blank" => Ok(Self::Blank),
+            "red" => Ok(Self::Red),
+            "tomato" => Ok(Self::Red),
+            "white" => Ok(Self::White),
+            "cheese" => Ok(Self::White),
+            "both" => Ok(Self::Margherita),
+            "normal" => Ok(Self::Margherita),
+            // Unknown
+            _ => Err("Unknown pizza base; ensure you have written the name in either English or Italian!"),
+        }
+    }
+}
+
+impl std::fmt::Display for PizzaBase {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", match self {
+            PizzaBase::Blank => "Blank (Empty)",
+            PizzaBase::Red => "Red (Tomato)",
+            PizzaBase::White => "White (Mozzarella)",
+            PizzaBase::Margherita => "Margherita (Tomato + Mozzarella)"
+        })
+    }
+}
+
+/// The toppings
+struct PizzaToppingsList {
+    pub list: Vec<String>
+}
+
+impl FromStr for PizzaToppingsList {
+    type Err = &'static str;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let list: Vec<String> = s.split(",").map(|s| s.to_string()).collect();
+
+        for topping in list.iter() {
+            // Ensure compatibility with https://github.com/rust-lang/rust/pull/70645
+            if ["pineapple", "ananas"].contains(&topping.as_str()) {
+                return Err("Ruining pizzas is not allowed by the Rust compiler.")
+            }
+        }
+
+        Ok(
+            PizzaToppingsList {
+                list
+            }
+        )
+    }
+}