Lowers hotend on ramming, must include ; RAMMING_TEMP: XXX in filament start gcode

lowerhotendonramming_v2.py

#!/usr/bin/env python

import fileinput
import re

ramming_temp_pattern = re.compile(r'\;\s+RAMMING_TEMP:\s+([0-9]{1,3})')
tool_unload_pattern = re.compile(r'(\; CP TOOLCHANGE UNLOAD\n)')
tool_load_pattern = re.compile(r'(\; CP TOOLCHANGE LOAD\n)')
temp_pattern = re.compile(r'M104 S([0-9]{1,3})')
empty_grid_pattern = re.compile(r'\; CP TOOLCHANGE END\n')
curtemp = ''
ramming_temp = ''

for line in fileinput.input(inplace=True, backup='.bak'):
    temp = temp_pattern.search(line)
    clear_ramming_temp = empty_grid_pattern.search(line)
    ramming_temp_search = ramming_temp_pattern.search(line)

    if temp:
        curtemp = int(temp.group(1))

    if ramming_temp_search:
        ramming_temp = int(ramming_temp_search.group(1))

    if clear_ramming_temp:
        ramming_temp = None

    if tool_unload_pattern.search(line) and ramming_temp:
        print tool_unload_pattern.sub(r'\1M104 S%s; Set ramming temp\n' % ramming_temp, line),
    elif tool_load_pattern.search(line) and ramming_temp:
        print tool_load_pattern.sub(r'\1M104 S%s; Return to printing temp\n' % curtemp, line),
    else:
        print line,