String parser for "key :value" text file

noawk.rb

#!/usr/bin/env ruby
#
# KING SABRI | @KINGSABRI
# Usage:
#   ruby noawk.rb file.txt
#
# One-liner:
# ruby -e 'h={};File.read("text.txt").split("\n").map{|l|l.split(":", 2)}.map{|k, v|k.strip!;v.strip!; h[k] ? h[k] << v : h[k] = [v]};h.each {|k, v| puts "#{k}:\t#{v.join(", ")}"}'
#

file = File.read(ARGV[0]).split("\n")
def parser(file)
  hash = {}         # Datastore
    
  splitter = file.map { |line| line.split(':', 2) }
  
  splitter.each do |k, v|
    k.strip!        # leading and trailing whitespace
    v.strip!        # leading and trailing whitespace
    
    if hash[k]      # if this key exists
      hash[k] << v  # add this value to the key's array
    else            # if not
      hash[k] = [v] # create the new key and add an array contains this value
    end
    
  end
    
  hash              # return the hash
end 

parser(file).each {|k, v| puts "#{k}:\t#{v.join(', ')}"}