Using Python to add text lines in a gcode file

[buran]

Something like this

from collections import deque

def process_code(in_code, insert_code):
   insert_at = deque()
   new_code = []
   next_insert = -1
   for i, line in enumerate(in_code.split('\n')):
       if insert_at and i >= next_insert:
           next_insert = insert_at.popleft()
       new_code.append(line)
       if i == next_insert:
           new_code.append(insert_code)
       if line.startswith(';LAYER:'):
           insert_at.append(i+2)
   return '\n'.join(new_code)
   
if __name__ == '__main__':

   in_code=""";LAYER_COUNT:191  
;LAYER:0  
M106 S255  
G0 F3600 X99.873 Y99.731 Z0.3  
;TYPE:WALL-INNER  
G1 F1800 X100.034 Y99.574 E0.02699  
G1 X100.225 Y99.441 E0.05491  
G1 X100.445 Y99.339 E0.08401  
;TIME_ELAPSED:18.234693  
;LAYER:1  
M107  
G0 F5400 X99.456 Y98.484 Z0.45  
;TYPE:WALL-INNER  
M106 255  
G1 F3300 X99.604 Y98.363 E47.83319  
G1 X99.774 Y98.299 E47.84409  
G1 X100.033 Y98.238 E47.86005  
G0 X99.568 Y98.521  
;TIME_ELAPSED:37.123855  
;LAYER:2  
M107  
G0 F7200 X98.896 Y97.697 Z0.6  
;TYPE:WALL-INNER  
M106 255  
G1 F4800 X99.103 Y97.5 E80.19273  
G1 X99.378 Y97.417 E80.20996  
G1 X99.486 Y97.403 E80.2165  
G0 X107.174 Y111.477  
;TIME_ELAPSED:1240.100936  
M107  

;End of Gcode  """

   insert_code = """G0 X100 Y50  
G1 F100 X100 Y10  
G1 F20 X110 Y10  
G1 F100 X110 Y170  
G1 F100 X110 Y10  
G1 F20 X100 Y10  
G0 X100 Y50"""

   print process_code(in_code, insert_code)