From: Gavin Kistner <gavin@...>
Date: 2005-06-13T22:24:35+09:00
Subject: [Highline] Custom validation

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For this week's Ruby Quiz, I would like to use Highline for user  
input. I understand how to get it to validate input based on a  
regexp, but I'd like to do more (after that is automatically handled,  
if possible).

After I get Highline to ensure that a user's input matches a square  
on the board (which can be done with the simple regexp) I'd like it  
to further ensure that there is a piece on the board, and that piece  
belongs to the player whose turn it is.

Is it possible to pass a custom post-validation block to to a  
Highline::Question, which will use the return value of that block to  
determine if the question should be asked again? (If not, consider  
this a feature request.)

I suppose it's not much different to do:

piece = nil
while !piece
     loc = ask( "Piece to move:" ){ |q|
         q.responses[ :not_valid ] = "Please specify a board  
location, such as a8 or c3"
         q.validate = /[a-h][1-8]/i
     }
     piece = board[ loc ]
     if piece && piece.color != board.turn_color
         puts "You can't move the piece at #{loc}, because it is not  
yours!"
         piece = nil
     end
end


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