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class Menu
attr_accessor :prompt
attr_accessor :entries
def initialize
@entries = []
end
def choice(name, &action)
entries << { :name => name, :action => action }
end
end
def choose
menu = Menu.new
yield menu
choice = nil
while choice.nil?
menu.entries.each_with_index do |entry, i|
puts "#{i+1}. #{entry[:name]}"
end
print menu.prompt unless menu.prompt.nil?
reply = $stdin.gets.chomp
i = reply.to_i
if i > 0
choice = menu.entries[i-1]
else
possible = menu.entries.find_all {|e| e[:name].to_s.start_with? reply }
case possible.size
when 0 then puts "No such option"
when 1 then choice = possible.first
else puts "Multiple options match: #{possible.map{|e| e[:name]}.join(' ')}"
end
end
end
choice[:action].call
end
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