Ultimaker Cura script to head nozzle and bed at the same time

HeatBedAndNozzleAtTheSameTime.py

from ..Script import Script
import re

##  Modifies G-Code to start nozzle heating without waiting for bed reaching
#   defined temperature which speeds up print start.
#
#   Due to technical limitations, the search can't cross the border between
#   layers.

class HeatBedAndNozzleAtTheSameTime(Script):
    def getSettingDataString(self):
        return """{
            "name": "Heat bed and nozzle at the same time",
            "key": "HeatBedAndNozzleAtTheSameTime",
            "metadata": {},
            "version": 2,
            "settings": {}
        }"""

    def execute(self, data):
        for layerno, layer in enumerate(data):
            bed_temperature, bed_temperature_line = None, -1
            nozzle_temperature, nozzle_temperature_line = None, -1

            lines = layer.split('\n')
            for lineno, line in enumerate(lines):
                if line.startswith('M190'):
                    m = re.search(' S(\d+)', line)
                    if m:
                        bed_temperature = int(m.group(1))
                        bed_temperature_line = lineno
                        break

            for lineno, line in enumerate(lines):
                if line.startswith('M104'):
                    m = re.search(' S(\d+)', line)
                    if m:
                        nozzle_temperature = int(m.group(1))
                        nozzle_temperature_line = lineno
                        break

            if bed_temperature or nozzle_temperature:
                commands = []
                temperature_line = len(lines)
                if bed_temperature >= 0:
                    commands.append('M140 S%d' % bed_temperature)
                    temperature_line = min(temperature_line, bed_temperature_line)
                if nozzle_temperature >= 0:
                    commands.append('M104 S%d' % nozzle_temperature)
                    temperature_line = min(temperature_line, nozzle_temperature_line)

                data[layerno] = '\n'.join(
                    lines[:temperature_line] + commands + lines[temperature_line:]
                )
                break

        return data