Search box with Ruby Shoes - ruby

Question

I have a short script that uses regular expressions to search a file for a specific phrase that a user types in. Basically, it's a simple search box.
I'm now trying to make this search box have a GUI, so that users are able to type into a box, and have their matches 'alerted' to them.
I'm new to using ruby shoes in any great detail, and have been using the examples on TheShoeBox website.
Can anyone point out where I'm going wrong with my code?
Here is my command line version that works:
string = File.read('db.txt')
puts "Enter what you're looking for below"
begin
while(true)
break if string.empty?
print "Search> "; STDOUT.flush; phrase = gets.chop
break if phrase.empty?
names = string.split(/\n/)
matches = names.select { |name| name[/#{phrase}/i] }
puts "\n \n"
puts matches
puts "\n \n"
end
end
Here is my attempt at using it within Ruby Shoes:
Shoes.app :title => "Search v0.1", :width => 300, :height => 150 do
string = File.read('db.txt')
names = string.split(/\n/)
matches = names.select { |name| name[/#{phrase}/i] }
def search(text)
text.tr! "A-Za-z", "N-ZA-Mn-za-m"
end
#usage = <<USAGE
Search - This will search for the inputted text within the database
USAGE
stack :margin => 10 do
para #usage
#input = edit_box :width => 200
end
flow :margin => 10 do
button('Search') { #output.matches }
end
stack(:margin => 0) { #output = para }
end
Many thanks

Answer 1

Well, for starters, the first code bit can be neatened up.
file = File.open 'db.txt', 'rb'
puts "Enter (regex) search term or quit:"
exit 1 unless file.size > 0
loop do
puts
print "query> "
redo if ( query = gets.chomp ).empty?
exit 0 if query == "quit"
file.each_line do |line|
puts "#{file.lineno}: #{line}" if line =~ /#{query}/i
end
file.rewind
end
The rb option lets it work as expected in Windows (especially with Shoes, you should try and be platform-independent). chomp strips off \r\n and \n but not a for example, while chop just blindly takes off the last character. loop do end is nicer than while true. Also why store matches in a variable? Just read through the file line by line (which allows for CRLF endings) as opposed to splitting by \n although the residual \r wouldn't really pose much of a problem...
As for the Shoes bit:
Shoes.app :title => "Search v0.2", :width => 500, :height => 600 do
#file = File.open 'db.txt', 'rb'
def search( file, query )
file.rewind
file.select {|line| line =~ /#{query}/i }.map {|match| match.chomp }
end
stack :margin => 10 do
#input = edit_line :width => 400
button "search" do
matches = search( #file, #input.text )
#output.clear
#output.append do
matches.empty? ?
title( "Nothing found :(" ) :
title( "Results\n" )
end
matches.each do |match|
#output.append { para match }
end
end
#output = stack { title "Search for something." }
end
end
You never defined #output.matches or called your search() method. See if it makes sense now.