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