June 2018 Update

Task/Menu/Rust/menu.rust

@@ -0,0 +1,47 @@
+fn menu_select<'a>(items: &'a [&'a str]) -> &'a str {
+    if items.len() == 0 {
+        return "";
+    }
+
+    let stdin = std::io::stdin();
+    let mut buffer = String::new();
+
+    loop {
+        for (i, item) in items.iter().enumerate() {
+            println!("{}) {}", i + 1, item);
+        }
+        print!("Pick a number from 1 to {}: ", items.len());
+
+        // Read the user input:
+        stdin.read_line(&mut buffer).unwrap();
+        println!();
+
+        if let Ok(selected_index) = buffer.trim().parse::<usize>() {
+            if 0 < selected_index {
+                if let Some(selected_item) = items.get(selected_index - 1) {
+                    return selected_item;
+                }
+            }
+        }
+
+        // The buffer will contain the old input, so we need to clear it before we can reuse it.
+        buffer.clear();
+    }
+}
+
+fn main() {
+    // Empty list:
+    let selection = menu_select(&[]);
+    println!("No choice: {:?}", selection);
+
+    // List with items:
+    let items = [
+        "fee fie",
+        "huff and puff",
+        "mirror mirror",
+        "tick tock",
+    ];
+
+    let selection = menu_select(&items);
+    println!("You chose: {}", selection);
+}