Creating a Ruby hash with key:value lines
===

Here's another "what's the most elegant way to do X in Ruby" type of questions.  Consider the response from a webservice with key:value pairs on each line of the return body, along the lines of

    key1:val1
    key2:val2
    key3:val3

I want to create a Ruby hash with this data, `{"key1" => "val1", ...}`.  Algorithmically I can git 'er done with 

    hash = {}
    body.lines.each do |line|
      key, val = line.split(':')
      hash[key] = val
    end

but I'm guessing there's a one-liner or two-liner that is even more elegant.