gistfile1.rb

#!/usr/bin/env ruby

# can be called like this:
#
# spec_run.rb foo.rb
# spec_run.rb foo_spec.rb
# spec_run.rb foo.rb -e "some test case"

ruby_file = "" + ARGV.shift

ruby_file.gsub! '.rb', ''
ruby_file.gsub! '_spec', ''

args = ARGV.collect do |arg|
  if arg.include?(' ')
    '"%s"' % arg
  else
    arg
  end
end

system "spec -c #{args * ' '} #{ruby_file}_spec.rb"