README.md

$ python app.py [filename]

app.py

import re
import sys

if len(sys.argv) < 2:
    print("Error: file name not given")
    print("Usage: python app.py [filename]")
    exit()

g0pattern = r"^G0.*"
g1pattern = r"^G1.*"
g0re = re.compile(g0pattern)
g1re = re.compile(g1pattern)

Xpattern = r".*X[-\.\d]+"
Ypattern = r".*Y[-\.\d]+"
Zpattern = r".*Z[-\.\d]+"
Xre = re.compile(Xpattern)
Yre = re.compile(Ypattern)
Zre = re.compile(Zpattern)

currentX = 0
currentY = 0
currentZ = 0
fout = open('out.csv','w')
should_update = False

filename = sys.argv[1]
with open(filename) as f:
    lines = f.readlines()
    for line in lines:
        if Xre.match(line): 
            should_update = True
            nextX = re.findall(Xpattern,line)[0].split('X')[1]
            if currentX != nextX:
                currentX = nextX
        if Yre.match(line): 
            should_update = True
            nextY = re.findall(Ypattern,line)[0].split('Y')[1]
            if currentY != nextY:
                currentY = nextY
        if Zre.match(line):
            should_update = True
            nextZ = re.findall(Zpattern,line)[0].split('Z')[1]
            if currentZ != nextZ:
                currentZ = nextZ
        if should_update:
            fout.write("{0},{1},{2}\n".format(currentX,currentY,currentZ))
            should_update = False
fout.close()