#!/usr/bin/python
# -*- coding: utf-8 -*-

import os
import string
try:
    from subprocess import getoutput
except ImportError:
    from commands import getoutput
import shutil
import sys

# Variables
xorgfile = "/etc/X11/xorg.conf"
xorgfile_backup = "/etc/X11/xorg.conf.sabayon"
lspci = '/usr/sbin/lspci'
nvidia_settings = "/usr/share/applications/nvidia-settings.desktop"

device_id_prefix = "SabayonVga"
argb_visual_prefix = "--argbvisuals--"
screen_layout_sections = []
device_sections = []
xorg_conf_structure = """
Section "Module"
    SubSection  "extmod"
       Option    "omit xfree86-dga"
    EndSubSection
    Load    "i2c"
    Load    "ddc"
    Load    "vbe"
    Load    "dri"
    Load    "glx"
    Load    "synaptics"
EndSection

Section "ServerFlags"
     Option    "AllowMouseOpenFail"    "true"
EndSection

Section "Monitor"
    Identifier    "Generic Monitor"
    VertRefresh    43 - 60
    HorizSync      28 - 80
EndSection

__device_section__

__screen_section__

Section "DRI"
    Mode 0666
EndSection

Section "ServerLayout"
    Identifier   "Main Layout"
    __screen_layout_section__
EndSection

Section "Extensions"
   #Option "Composite" "Enable"
EndSection
"""

screen_sections = []
screen_section = """
Section "Screen"

    Identifier    "Screen __screen_id__"
    Device        "%s__screen_id__"
    Monitor       "Generic Monitor"
    %sOption       "AddARGBGLXVisuals" "true"

    DefaultDepth 24

    SubSection "Display"
        Depth		8
        ViewPort	0 0
        #Modes		"1024x768" "800x600" "640x480"
    EndSubsection

    SubSection "Display"
        Depth           16
        ViewPort        0 0
        #Modes		"1024x768" "800x600" "640x480"
    EndSubsection

    SubSection "Display"
        Depth           24
        ViewPort        0 0
        #Modes		"1024x768" "800x600" "640x480"
    EndSubsection

EndSection
""" % (device_id_prefix, argb_visual_prefix,)

# cmdlines
options = sys.argv[1:]
dryrun = False
noproprietary = False
nvidia_forcefail = False
nvidia_disablelegacy = False
legacy = False
noopengl = False
noexa = False
livecd = False
steps = []
forced_xdriver = ''
current_arch = os.uname()[4]
if current_arch == "x86_64":
	ld_arch = "elf_x86_64"
else:
	ld_arch = "elf_i386"

fglrx_supported = sorted(getoutput("""/sbin/modinfo fglrx | grep alias | grep pci | cut -d':' -f 3 | cut -d'*' -f 1 | sed 's/.*1002d//' | sed 's/^0000//' | sed 's/sv$//'""").lower().split())

nvidia_71xx_supported = ['0020', '0028', '0029', '002c', '002d', '00a0',
    '0100', '0101', '0103', '0150', '0151', '0152', '0153']
nvidia_96xx_supported = ['0110', '0111', '0112', '0113', '0170', '0171',
    '0172', '0173', '0174', '0175', '0176', '0177', '0178', '0179', '017a',
    '017c', '017d', '0181', '0182', '0183', '0185', '0188', '018a', '018b',
    '018c', '01a0', '01f0', '0200', '0201', '0202', '0203', '0250', '0251',
    '0253', '0258', '0259', '025b', '0280', '0281', '0282', '0286', '0288',
    '0289', '028c']
nvidia_173xx_supported = ['00fa', '00fb', '00fc', '00fd', '00fe', '0301',
    '0302', '0308', '0309', '0311', '0312', '0314', '031a', '031b', '031c',
    '0320', '0321', '0322', '0323', '0324', '0325', '0326', '0327', '0328',
    '032a', '032b', '032c', '032d', '0330', '0331', '0332', '0333', '0334',
    '0338', '033f', '0341', '0342', '0343', '0344', '0347', '0348', '034c',
    '034e']
savage_supported = ['8a20', '8a21', '8a22', '9102', '8c10', '8c11', '8c12',
    '8c13', '8c22', '8c24', '8c26', '8c2a', '8c2b', '8c2c', '8c2d', '8c2e',
    '8c2f', '8a25', '8a26', '8d01', '8d02', '8d03', '8d04']
unichrome_supported = ['3108', '3118', '3157', '3343', '3344', '7205']

lspci_output = ''
for option in options:
	if option == "--dry-run":
		dryrun = True
	elif option.startswith('--with-lspci=') and len(option.split("=")) >= 2:
		option = option.split("=")[1:]
		option = string.join(option,"=")
		if option.startswith('"'): option = option[1:]
		if option.startswith("'"): option = option[1:]
		if option.endswith("'"): option = option[:len(option)-1]
		if option.endswith('"'): option = option[:len(option)-1]
		lspci_output = option
	elif option.startswith('--forced-xdriver=') and len(option.split("=")) == 2:
		forced_xdriver = option.split("=")[1]
	elif option == "--noopengl":
		noopengl = True
	elif option == "--noexa":
		noexa = True

if not lspci_output:
	lspci_output = getoutput(lspci+' -mm -n')

# parse cmdline
f = open("/proc/cmdline","r")
cmdline = f.readline().split()
f.close()
for cmd in cmdline:
	if cmd == "noproprietary":
		noproprietary = True
	elif cmd == "nvidia=forcefail":
		nvidia_forcefail = True
	elif cmd == "nvidia=disablelegacy":
		nvidia_disablelegacy = True
	elif cmd == "legacy":
		legacy = True
	elif cmd == "noopengl":
		noopengl = True
	elif cmd == "cdroot":
		livecd = True
	elif cmd == "noexa":
		noexa = True
	elif cmd.startswith("xdriver=") and (len(cmd.split("=")) == 2):
		if (not forced_xdriver): forced_xdriver = cmd.split("=")[1] # --forced-xdriver= owns


# Functions
def remove_proprietary_opengl():
	if (not dryrun):
		os.system('''
		mount -t tmpfs none /usr/lib/opengl/ati &> /dev/null
		mount -t tmpfs none /usr/lib/opengl/nvidia &> /dev/null
		sed -i '/LIBGL_DRIVERS_PATH/ s/.*//' /etc/profile.env
		''')
		fix_possible_opengl_misconfiguration('xorg-x11')
	else:
		print("I was about to remove proprietary OpenGL libraries")

def remove_tar_members_from_sys(tarpath):
	import tarfile
	tar = tarfile.open(tarpath)
	for el in sorted(tar.getnames(), reverse = True):
		el = "/%s" % (el,)
		if os.path.isfile(el):
			try:
				os.remove(el)
			except OSError:
				pass
		if os.path.isdir(el):
			try:
				os.rmdir(el)
			except OSError:
				pass
	tar.close()

def check_if_driver_is_available(xdriver):
	if os.path.isfile('/usr/lib/xorg/modules/drivers/'+xdriver+'_drv.so'):
		print("check_if_driver_is_available for "+xdriver+": available")
		return True
	print("check_if_driver_is_available for "+xdriver+": not available")
	return False

def check_if_proprietary_driver_system_is_healthy(kernelmod):
	rc = os.system('modprobe '+kernelmod+' &> /dev/null')
	if (rc == 0):
		if kernelmod == "nvidia":
			if os.path.exists('/usr/lib/opengl/nvidia/lib'):
				print("check_if_proprietary_driver_system_is_healthy: nvidia healthy")
				return True
			print("check_if_proprietary_driver_system_is_healthy: nvidia NOT healthy")
			return False
		if kernelmod == "fglrx":
			if os.path.exists('/usr/lib/opengl/ati/lib'):
				print("check_if_proprietary_driver_system_is_healthy: ati healthy")
				return True
			print("check_if_proprietary_driver_system_is_healthy: ati NOT healthy")
			return False
	else:
		return False

def deploy_nvidia_xxxxxx_drivers(ver):
	if (not dryrun):
		# are they available ? we're on livecd...
		if not os.path.isdir("/install-data/drivers"):
			print("No /install-data/drivers available")
			return False
		
		packages = os.listdir("/install-data/drivers")
		packages = [x for x in packages if x.startswith("x11-drivers:nvidia-drivers-"+ver) and x.endswith(".tbz2")]
		if not packages:
			return False
		package_file = "/install-data/drivers/"+packages[0]
		if not os.path.isfile(package_file):
			print(package_file+" does not exist???")
			return False

		from entropy.client.interfaces import Client
		from entropy.const import const_kill_threads
		Equo = Client()

		# prepare system
		idpackage, result = Equo.installed_repository().atomMatch('x11-drivers/nvidia-drivers')
		if idpackage != -1:
			content = Equo.installed_repository().retrieveContent(idpackage)
			for myfile in content:
				if os.path.isfile(myfile) and os.access(myfile,os.W_OK):
					try:
						os.remove(myfile)
					except OSError:
						pass
			del content

		if hasattr(Equo,'destroy'):
			Equo.destroy()
		del Equo
		# Entropy Cacher still running
                const_kill_threads()

		# remove old garbage - copy over - create module
		os.system("tar xjf %s -C / &> /dev/null" % (package_file,))

		# try to check driver status now
		rc = check_if_proprietary_driver_system_is_healthy("nvidia")
		if not rc:
			remove_tar_members_from_sys(package_file)
		return rc
	else:
		print("I was about to run deploy_nvidia_xxxxxx_drivers, ver: %s" % (ver,))
		return False

def set_xorg_device(xdriver, cardnum, total_cards, bus_id):
	if (xdriver not in ("nvidia", "fglrx",)) and \
		(not check_if_driver_is_available(xdriver)):
		xdriver = "vesa" # fallback to vesa
	bus_id_mark = '#'
	if total_cards > 1:
		bus_id_mark = ''

	device_sections.append("""
Section "Device"

    Identifier  "%s%s"
    Driver      "%s"
    %sBusID    "%s"
    #Option "RenderAccel" "on"
    #Option "XAANoOffscreenPixmaps"
    #Option "BusType" "PCI"
    #Option "ColorTiling" "on"
    #Option "EnablePageFlip" "on"
    Option "UseEvents" "True"
    Option "LogoPath" "/usr/share/backgrounds/sabayonlinux-nvidia.png"

EndSection
	""" % (device_id_prefix,cardnum,xdriver,bus_id_mark,bus_id,)
	)

	my_screen_section = screen_section.replace('__screen_id__',str(cardnum))
	# setup Option AddARGBVisuals
	# especially needed for legacy nvidia drivers, but works
	# on all of them
	if xdriver == "nvidia":
		my_screen_section = my_screen_section.replace(argb_visual_prefix,'')
	else:
		my_screen_section = my_screen_section.replace(argb_visual_prefix,'#')
	screen_sections.append(my_screen_section)
	screen_layout_sections.append('Screen %s    "Screen %s"' % (cardnum,cardnum,))


def opengl_activate(profile):
	current = opengl_show()
	default_profile = "xorg-x11"
	if (not dryrun):
		if (livecd):
			if (profile != default_profile) or (profile == default_profile and current != default_profile):
				os.system("opengl-activator "+profile+" &> /dev/null")
		else:
			os.system("eselect opengl set "+profile+" &> /dev/null")
	else:
		print("I was about to set opengl subsystem to: "+profile)

def opengl_show():
	if livecd:
		return getoutput("opengl-activator show").split("\n")[0].strip()
	return getoutput("eselect opengl show").split("\n")[0].strip()

def fix_possible_opengl_misconfiguration(profile):
	# get current subsystem
	current = opengl_show()
	if (not dryrun):
		if (profile in ("ati","nvidia","xorg-x11")) and (profile != current):
			if profile == "ati" or profile == "nvidia":
				os.system("""
				umount /usr/lib/opengl/"""+profile+""" &> /dev/null
				umount /usr/lib/opengl/"""+profile+""" &> /dev/null
				""")
			opengl_activate(profile)
	else:
		print("I was about to fix OpenGL subsystem to: "+profile+" while the current implementation is: "+current)
	
def copy_nvidia_settings_on_desktop():
	if os.path.isfile(nvidia_settings):
		homes = os.listdir("/home")
		homes = [x for x in homes if os.path.isdir("/home/"+x+"/Desktop")]
		for home in homes:
			try:
				full_home = os.path.join("/home", home)
				st = os.stat(full_home)
				dest_path = "/home/" + home + "/Desktop/" + os.path.basename(nvidia_settings)
				shutil.copy2(nvidia_settings, dest_path)
				os.chmod(dest_path, 0o755)
				os.chown(dest_path, st.st_uid, st.st_gid)
			except:
				pass
		if os.path.isdir("/etc/skel/Desktop"):
			dest_path = "/etc/skel/Desktop/"+os.path.basename(nvidia_settings)
			shutil.copy2(nvidia_settings, dest_path)
			os.chmod(dest_path, 0o755)

def copy_ati_settings_on_desktop():
	desktop_files = getoutput('equo query files ati-drivers --quiet | grep ".desktop"').split("\n")
	desktop_files = [x for x in desktop_files if os.path.isfile(x)]
	print("copy_ati_settings_on_desktop: found files: "+str(desktop_files))
	for ati_settings in desktop_files:
		homes = os.listdir("/home")
		homes = [x for x in homes if os.path.isdir("/home/"+x+"/Desktop")]
		for home in homes:
			try:
				full_home = os.path.join("/home", home)
				st = os.stat(full_home)
				dest_path = "/home/"+home+"/Desktop/"+os.path.basename(ati_settings)
				shutil.copy2(ati_settings, dest_path)
				os.chmod(dest_path, 0o755)
				os.chown(dest_path, st.st_uid, st.st_gid)
			except:
				pass
		if os.path.isdir("/etc/skel/Desktop"):
			dest_path = "/etc/skel/Desktop/"+os.path.basename(ati_settings)
			shutil.copy2(nvidia_settings, dest_path)
			os.chmod(dest_path, 0o755)


def generate_nvidia_steps(videocard, cardnumber, total_cards, bus_id):

	comp_id, card_id = extract_pci_ids(videocard)
	drv_string = ''
	done_legacy = False
	if card_id in nvidia_173xx_supported:
		print("NVIDIA 173.xx driver selected")
		drv_string = "17x.xx.xx"
		if livecd:
			rc = deploy_nvidia_xxxxxx_drivers("17")
			if rc:
				print("NVIDIA 17x.xx deployed correctly")
				done_legacy = True
	elif card_id in nvidia_96xx_supported:
		print("NVIDIA 96.xx driver selected")
		drv_string = "9x.xx.xx"
		if livecd:
			rc = deploy_nvidia_xxxxxx_drivers("9")
			if rc:
				print("NVIDIA 96.xx deployed correctly")
				done_legacy = True
	elif card_id in nvidia_71xx_supported:
		print("NVIDIA 7x.xx driver selected")
		drv_string = "7x.xx.xx"
		if livecd:
			rc = deploy_nvidia_xxxxxx_drivers("7")
			if rc:
				print("NVIDIA 7x.xx deployed correctly")
				done_legacy = True
	else:
		print("latest and greatest NVIDIA driver selected or unsupported")

	if check_if_proprietary_driver_system_is_healthy("nvidia"):

		print("NVIDIA proprietary driver %s is loaded" % (drv_string,))
		if done_legacy:
			# then activate nvidia opengl subsystem after resetting it
			steps.append(('opengl_activate','xorg-x11'))
			steps.append(('opengl_activate','nvidia'))
			os.makedirs("/lib/nvidia/legacy")

			f = open("/lib/nvidia/legacy/running","w")
			f.write("NVIDIA %s\n" % (drv_string,))
			f.flush()
			f.close()

			steps.append(('set_xorg_device','nvidia',cardnumber,total_cards,bus_id,))
			steps.append(('fix_possible_opengl_misconfiguration','nvidia'))
			steps.append(('copy_nvidia_settings_on_desktop',))

		else:

			steps.append(('fix_possible_opengl_misconfiguration','nvidia'))
			steps.append(('copy_nvidia_settings_on_desktop',))
			steps.append(('opengl_activate','nvidia'))
			steps.append(('set_xorg_device','nvidia',cardnumber,total_cards,bus_id,))
	else:
		print("NVIDIA drivers couldn't be loaded, switchting to nv driver")
		steps.append(('opengl_activate','xorg-x11'))
		steps.append(('set_xorg_device','nv',cardnumber,total_cards,bus_id,))

def generate_generic_steps():
	if noopengl:
		return
	steps.append(('remove_proprietary_opengl',))
	steps.append(('opengl_activate','xorg-x11',))

def drop_kernel_mod(kmod):
	return os.system("modprobe -r %s &> /dev/null" % (kmod,))

def extract_pci_ids(videocard_str):
	videocard_split = [x.strip() for x in videocard_str.strip().split('"') \
		if x.strip()]
	try:
		card_id = videocard_split[3].split()[-1].lower().strip("[]")
	except IndexError:
		card_id = None
	try:
		company_id = videocard_split[2].split()[-1].lower().strip("[]")
	except IndexError:
		company_id = None

	return company_id, card_id

def extract_vga_cards(lspci_list):
    cards = []
    for item in lspci_list:
        try:
            class_type = item.split()[1].strip('"')
            if class_type == "0300":
                cards.append(item)
        except IndexError:
            continue
    return cards

### APPLICATION

# Create videocards list
videocards = extract_vga_cards(lspci_output.split("\n"))
# Run the program
cardnumber = -1

total_cards = len(videocards)
forced_monitor_modes = False
for videocard in videocards:

	# setup card number
	cardnumber += 1
	print("Card Number: "+str(cardnumber))
	try:
		bus_id = "PCI:%s" % (videocard.split()[0].split(".",1)[0],)
	except (IndexError,ValueError,TypeError,):
		bus_id = None

	steps = []
	if forced_xdriver:
		print("You have chosen to force X driver: "+forced_xdriver)
		if forced_xdriver == "fglrx":
			if noopengl or check_if_proprietary_driver_system_is_healthy("fglrx") or noproprietary:
				steps.append(('opengl_activate','xorg-x11'))
				forced_xdriver = "ati"
				steps.append(('drop_kernel_mod','fglrx',))
			else:
				steps.append(('fix_possible_opengl_misconfiguration','ati'))
				steps.append(('copy_ati_settings_on_desktop',))
				steps.append(('opengl_activate','ati'))
				
		elif forced_xdriver == "nvidia" and (not noproprietary):
			generate_nvidia_steps(videocard, cardnumber, total_cards, bus_id)
		elif forced_xdriver == "vesa":
			forced_monitor_modes = True
		elif forced_xdriver == "sisusb":
			steps.append(('remove_proprietary_opengl',))
		else:
			generate_generic_steps()
		steps.append(('set_xorg_device',forced_xdriver,cardnumber,total_cards,bus_id,))
	else:

		company_id, card_id = extract_pci_ids(videocard)
		print("[%s] company_id: %s | card_id: %s" % (cardnumber, company_id, card_id,))

		if os.path.isfile('/sys/module/sisusbvga'):
			generate_generic_steps()
			steps.append(('set_xorg_device','sisusb',cardnumber,total_cards,bus_id,))
			print("SiS USB!")

		elif company_id == "10c8":
			generate_generic_steps()
			steps.append(('set_xorg_device','neomagic',cardnumber,total_cards,bus_id,))
			print("Neomagic!")
	
		elif company_id == "1078": # Cyrix
			generate_generic_steps()
			print("Cyrix!")
	
		elif company_id == "105d": # Number 9
			generate_generic_steps()
			steps.append(('set_xorg_device','i128',cardnumber,total_cards,bus_id,))
			print("i128!")
	
		elif company_id == "1163": # Rendition
			generate_generic_steps()
			steps.append(('set_xorg_device','rendition',cardnumber,total_cards,bus_id,))
			print("Rendition!")
	
		elif company_id == "100c": # Tseng!
			generate_generic_steps()
			steps.append(('set_xorg_device','tseng',cardnumber,total_cards,bus_id,))
			print("Tseng!")
	
		elif company_id == "121a": # 3dfx
			generate_generic_steps()
			steps.append(('set_xorg_device','tdfx',cardnumber,total_cards,bus_id,))
			print("3Dfx!")
	
		elif company_id == "1023": # Trident
			generate_generic_steps()
			steps.append(('set_xorg_device','trident',cardnumber,total_cards,bus_id,))
			print("Trident!")
	
		elif company_id == "102b": # Matrox
			generate_generic_steps()
			steps.append(('set_xorg_device','mga',cardnumber,total_cards,bus_id,))
			print("Matrox!")
	
		elif company_id == "1013": # Cirrus
			generate_generic_steps()
			steps.append(('set_xorg_device','cirrus',cardnumber,total_cards,bus_id,))
			print("Cirrus!")
		
		elif company_id == "1039": # SiS
			generate_generic_steps()
			steps.append(('set_xorg_device','sis',cardnumber,total_cards,bus_id,))
			print("SiS!")
	
		elif company_id == "18ca": # XGI
			generate_generic_steps()
			steps.append(('set_xorg_device','sis',cardnumber,total_cards,bus_id,))
			print("XGI Volari!")
	
		elif company_id in ["15ad", "fffe"]: # VMware
			generate_generic_steps()
			steps.append(('set_xorg_device','vmware',cardnumber,total_cards,bus_id,))
			print("VMware!")

		elif company_id == "80ee": # VirtualBox, InnoTek
			generate_generic_steps()
			steps.append(('set_xorg_device','vboxvideo',cardnumber,total_cards,bus_id,))
			print("VirtualBox!")

		elif company_id == "5333":
			generate_generic_steps()
			if card_id in savage_supported:
				steps.append(('set_xorg_device','savage',cardnumber,total_cards,bus_id,))
				print("Savage!")
			else:
				steps.append(('set_xorg_device','s3virge',cardnumber,total_cards,bus_id,))
				print("S3Virge!")
	
		elif company_id == "1106": # Via Tech.
			generate_generic_steps()
			if card_id in unichrome_supported:
				if check_if_driver_is_available('openchrome'):
					steps.append(('set_xorg_device','openchrome',cardnumber,total_cards,bus_id,))
				else:
					steps.append(('set_xorg_device','via',cardnumber,total_cards,bus_id,))
				print("UniChrome!")
			else:
				steps.append(('set_xorg_device','via',cardnumber,total_cards,bus_id,))
				print("VIA Tech!")
	
		elif company_id == "126f": # Silicon Motion
			generate_generic_steps()
			steps.append(('set_xorg_device','siliconmotion',cardnumber,total_cards,bus_id,))
			print("Silicon Motion!")
	
		elif company_id == "8086":
			if card_id == "7800": # i740
				generate_generic_steps()
				steps.append(('set_xorg_device','i740',cardnumber,total_cards,bus_id,))
			else:
				generate_generic_steps()
				steps.append(('set_xorg_device','intel',cardnumber,total_cards,bus_id,))
				print("Intel >= 810!")
	
		elif company_id == "10de": # NVIDIA
			if noproprietary:
				steps.append(('set_xorg_device','nv',cardnumber,total_cards,bus_id,))
			else:
				generate_nvidia_steps(videocard, cardnumber, total_cards, bus_id)
			print("NVIDIA!")
		
		elif company_id == "1002":
			print("ATI/AMD!")
			print("total supported ATI cards: %s" % (len(fglrx_supported),))
			print("supported list:", fglrx_supported)
			if card_id in fglrx_supported: # fglrx supported
				print("fglrx driver SUPPORTS this card")
				if noproprietary:
					steps.append(('set_xorg_device','ati',cardnumber,total_cards,bus_id,))
					steps.append(('drop_kernel_mod','fglrx',))
				else:
					if not noopengl:
						steps.append(('fix_possible_opengl_misconfiguration','ati'))
						steps.append(('copy_ati_settings_on_desktop',))
						steps.append(('opengl_activate','ati'))
					steps.append(('set_xorg_device','fglrx',cardnumber,total_cards,bus_id,))
			else:
				# video card not supported by fglrx
				print("NOT supported by fglrx")
				generate_generic_steps()
				# This works for Mach64, Rage128, Radeon and in future RadeonHD driver
				steps.append(('set_xorg_device','ati',cardnumber,total_cards,bus_id,))
				steps.append(('drop_kernel_mod','fglrx',))

		else:
			steps.append(('set_xorg_device','vesa',cardnumber,total_cards,bus_id,))
			print("ATTENTION !!!")
			print("ATTENTION !!!")
			print("ATTENTION !!!")
			print("--> Video Card undetected: "+videocard)
			print("SETTING TO VESA")
			print("Please report this output to Sabayon Linux developers or mail to LXNAY <at> SABAYON <dot> ORG")
	
	# now create the file
	for step in steps:
		if len(step) == 1:
			eval(step[0])()
		else:
			param = step[1:]
			eval(step[0])(*param)


# Generate xorg.conf
xorg_conf_structure = xorg_conf_structure.replace('__device_section__','\n\n'.join(device_sections))
xorg_conf_structure = xorg_conf_structure.replace('__screen_section__','\n\n'.join(screen_sections))
xorg_conf_structure = xorg_conf_structure.replace('__screen_layout_section__','\n    '.join(screen_layout_sections))
if forced_monitor_modes:
	xorg_conf_structure = xorg_conf_structure.replace('#Modes','Modes')
if not dryrun:
	f = open(xorgfile,"w")
	g = open(xorgfile_backup,"w")
	f.write(xorg_conf_structure)
	f.flush()
	f.close()
	g.flush()
	g.close()
raise SystemExit(0)