Konamio

gem install konamio

and

require "konamio"

Default Usage

> Konamio::Sequence::Requisition.new.execute!
Enter konami code (or hit escape)
Good job, you.
=> #<Konamio::Result:0x937ddb4
  @data={:data=>{:confirmation=>"Good job, you."}},
  @success=true>

Configuration

Sequences

You can configure it to listen for any ascii based sequence you want. This can be specified using a string ("foobar") or an array of recognized symbols and one character strings (escaped characters are okay, e.g. [:up, "1", "2", "3", "\t"]):

> Konamio::Sequence::Requisition.new({
    sequence:     "a".upto("z").to_a.reverse,
    prompt:       "Say the alphabet backwards",
    confirmation: "Okay, you can go"
  }).execute!
Say the alphabet backwards
Okay, you can go
=> #<Konamio::Result:0x9265788
  @data={:data=>{:confirmation=>"Okay, you can go"}},
  @success=true>

Output

There are three dialogs that Konamio might send to standard out.

1. :prompt is the dialog displayed initially, and each time the user fails to supply the proper sequence.
2. :confirmation is displayed when the required sequence is entered properly.
3. :cancellation is displayed when user terminates by pressing the escape key.

You can customize any of these dialogs, or disable them individually by passing a falsey value.

Success!

It would be boring if all Konamio did was return a result object. In fact, Konamio::Sequence::Requisition#execute! takes a block, and will execute that block when the sequence has been successfully entered. You're limited only by your imagination and the context of your application.

The following code would prompt the user to enter the konami code twice:

Konamio::Sequence::Requisition.new.execute! { Konamio::Sequence::Requisition.new.execute! }

This would give you +30 lives:

Konamio::Sequence::Requisition.new.execute! { 30.times { puts "+1up" } }

More fun

"Password protect" your rails console by doing the following:

1. Follow these instructions to obtain a .irbrc file that loads your local .irbrc
2. Add this gem to your rails project, then create a .irbrc file for the project containing

require "konamio"
Konamio::Sequence::Requisition.new(prompt: false, confirmation: false, cancellation: false).execute!

to require console users to enter the konami code. This funny trick obviously does not provide any real protection, but it would certainly make for a nasty practical joke.