convert g-code to acceptable format for sprinter or marlin.

gc4marlin.rb

#!/usr/bin/env ruby
lastcmd="G0"
while line = gets
  print "#{lastcmd}" if /^\s/ =~ line
  print line
  if /G(\d+)/ =~ line then
    case $1.to_i
    when 0 .. 3
      lastcmd=$&
    end
  end
end

Here is my functional version in python.
G0 and G1 Speeds are detailed in each line, and asuming default when isn`t defined yet

https://gist.github.com/pablinhob/5b4a28e6b459bf64f90c