# A simple script to convert the output of Skeinforge 
# into a form useable by EMC2. 
#
# This code:
#   1) Removes all M codes
#   2) Replaces 'E' with 'A', as the A axis is used to control the extruder motor
#   3) Adds "M30" as the final line so that AXIS does not complain about the file
#   4) Allows the A values to be scaled by the #1 variable
#   5) Sets the A position to 0 before it is otherwise used.
#   6) Sets EMC2 into G64 mode with a precision specification of 0.1mm
#
# The code is hereby released into the public domain.
#
# To run the code:
#    awk -f fixup.awk inputfile.gcode > outputfile.ngc
#

BEGIN{ print "#1=1"; }
NR==3{ print "G92 A0"; print "G64 P0.1"; }
/^M/{ next; }
/E/{ i = index($0,"E");
	b = substr($0,0,i-1);
	i = i + 1;
      n = "";
	c = substr($0,i,1);
	while( ( c >= "0" && c <= "9" ) || c == "." || c == "-" )
	{
	      n = n  c;
		i = i + 1;
		c = substr($0,i,1);
	}
	nn = n + 0;
	print b  "A[" nn "*#1]"   substr($0,i+1);
	next;
}
{ print $0 }
END{ print "M30"; }