A-M baby

Task/Menu/D/menu.d

@@ -0,0 +1,34 @@
+import std.stdio, std.conv, std.string, std.array;
+
+string menuSelect(in string[] entries) {
+    static int validChoice(in string input,
+                           in int nEntries) pure nothrow {
+        try {
+            immutable n = to!int(input);
+            return (n >= 0 && n <= nEntries) ? n : -1;
+        } catch (Exception e) // very generic
+            return -1; // not valid
+    }
+
+    if (entries.empty)
+        return "";
+
+    while (true) {
+        writeln("Choose one:");
+        foreach (i, const string entry; entries)
+            writefln("  %d) %s", i, entry);
+        writef("> ");
+        immutable input = readln().chomp();
+        immutable choice = validChoice(input, entries.length-1);
+        if (choice != -1)
+            return entries[choice]; // we have a valid choice
+        else
+            writeln("Wrong choice.");
+    }
+}
+
+void main() {
+    immutable items = ["fee fie", "huff and puff",
+                       "mirror mirror", "tick tock"];
+    writeln("You chose '", menuSelect(items), "'.");
+}