increase or decrease dimensions of GCode in .gcode/.gco/.nc files for things like CNC routers

gcsize.py

# gcsize.py - increase or decrease dimensions of GCode in .gcode/.gco/.nc files for things like CNC routers
#
# written by dayt0n

import sys
import os
import re

if len(sys.argv) < 3:
	print("Insufficient arguments\nusage: %s [GCode file] [output] [size multiplier]") % sys.argv[0]
	sys.exit(0)
filename = sys.argv[1]
file = open(filename,"r")
lines = file.readlines()
lines = [re.sub("\ \ +"," ",l.rstrip()) for l in lines] # replace every multiple occurrence of spaces with one space and remove newline chars
print("%s has %d lines") % (filename,len(lines))
newfile = open(sys.argv[2],"w")
print("Resizing by a factor of %s") % sys.argv[3]
for i in range(len(lines)):
	newStr = ""
	if " " in lines[i]:
		if lines[i][0] == " ":
			lines[i] = lines[i][1:]
		splitString = lines[i].split(" ")
		newSplitStr = [] * len(splitString)
		for i in range(len(splitString)):
			if splitString[i][0] == "X" or splitString[i][0] == "Y" or splitString[i][0] == "I" or splitString[i][0] == "J":
				if splitString[i][-1] is ".":
					splitString[i] = splitString[i][:-1] # remove unnecessary period
				newSplitStr.append(splitString[i][0] + str(float(splitString[i][1:]) * float(sys.argv[3]))) # multiply it
			else:
				newSplitStr.append(splitString[i])
		for i in range(len(splitString)):
			newStr += (newSplitStr[i] + " ")
	else:
		newStr = lines[i]
	newfile.write(newStr + "\n")
print("Finished writing to %s") % sys.argv[2]
newfile.close()
file.close()