#!/usr/bin/python3
# DSL - easy Display Setup for Laptops
-# Copyright (C) 2012-201
4 Ralf Jung <post@ralfj.de>
+# Copyright (C) 2012-201
5 Ralf Jung <post@ralfj.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
import argparse, sys, os, re, subprocess
-from gui import getFrontend
-frontend = getFrontend("cli") # the fallback, until we got a proper frontend. This is guaranteed to be available.
+from enum import Enum
+import gui, screen
+frontend = gui.getFrontend("cli") # the fallback, until we got a proper frontend. This is guaranteed to be available.
-# for auto-config: common names of internal connectors
-commonInternalConnectorNames = ['LVDS', 'LVDS0', 'LVDS1', 'LVDS-0', 'LVDS-1']
-# this is as close as one can get to an enum in Python
-class RelativeScreenPosition:
- LEFT = 0
- RIGHT = 1
- EXTERNAL_ONLY = 2
+# for auto-config: common names of internal connectors
+commonInternalConnectorPrefixes = ['LVDS', 'eDP']
+commonInternalConnectorSuffices = ['', '0', '1', '-0', '-1']
+def commonInternalConnectorNames():
+ for prefix in commonInternalConnectorPrefixes:
+ for suffix in commonInternalConnectorSuffices:
+ yield prefix+suffix
-# storing what's necessary for screen setup
-class ScreenSetup:
- def __init__(self, relPosition, intResolution, extResolution, extIsPrimary = False):
- '''relPosition must be one of the RelativeScreenPosition members, the resolutions must be (width, height) pairs'''
- self.relPosition = relPosition
- self.intResolution = intResolution # value doesn't matter if the internal screen is disabled
- self.extResolution = extResolution
- self.extIsPrimary = extIsPrimary or self.relPosition == RelativeScreenPosition.EXTERNAL_ONLY # external is always primary if it is the only one
-
- def getInternalArgs(self):
- if self.relPosition == RelativeScreenPosition.EXTERNAL_ONLY:
- return ["--off"]
- args = ["--mode", res2xrandr(self.intResolution)] # set internal screen to desired resolution
- if not self.extIsPrimary:
- args.append('--primary')
- return args
-
- def getExternalArgs(self, intName):
- args = ["--mode", res2xrandr(self.extResolution)] # set external screen to desired resolution
- if self.extIsPrimary:
- args.append('--primary')
- if self.relPosition == RelativeScreenPosition.LEFT:
- args += ['--left-of', intName]
- elif self.relPosition == RelativeScreenPosition.RIGHT:
- args += ['--right-of', intName]
- return args
# Load a section-less config file: maps parameter names to space-separated lists of strings (with shell quotation)
def loadConfigFile(filename):
# add some convencience get functions
return result
-# helper function: execute a process, return output as iterator, throw exception if there was an error
-# you *must* iterate to the end if you use this!
-def processOutputGen(*args):
- with subprocess.Popen(args, stdout=subprocess.PIPE) as p:
- for line in p.stdout:
- yield line.decode("utf-8")
- if p.returncode != 0:
- raise Exception("Error executing "+str(args))
-def processOutputIt(*args):
- return list(processOutputGen(*args)) # list() iterates over the generator
-
-# Run xrandr and return a dict of output names mapped to lists of available resolutions, each being a (width, height) pair.
-# An empty list indicates that the connector is disabled.
-def getXrandrInformation():
- connectors = {} # map of connector names to a list of resolutions
- connector = None # current connector
- for line in processOutputGen("xrandr", "-q"):
- # screen?
- m = re.search(r'^Screen [0-9]+: ', line)
- if m is not None: # ignore this line
- connector = None
- continue
- # new connector?
- m = re.search(r'^([\w\-]+) (dis)?connected ', line)
- if m is not None:
- connector = m.groups()[0]
- assert connector not in connectors
- connectors[connector] = []
- continue
- # new resolution?
- m = re.search(r'^ ([\d]+)x([\d]+) +', line)
- if m is not None:
- assert connector is not None
- connectors[connector].append((int(m.groups()[0]), int(m.groups()[1])))
- continue
- # unknown line
- # not fatal as my xrandr shows strange stuff when a display is enabled, but not connected
- #raise Exception("Unknown line in xrandr output:\n"+line)
- print("Warning: Unknown xrandr line %s" % line)
- return connectors
-
-# convert a (width, height) pair into a string accepted by xrandr as argument for --mode
-def res2xrandr(res):
- (w, h) = res
- return str(w)+'x'+str(h)
-# convert a (width, height) pair into a string to be displayed to the user
-def res2user(res):
- (w, h) = res
- # get ratio
- ratio = int(round(16.0*h/w))
- if ratio == 12: # 16:12 = 4:3
- strRatio = '4:3'
- elif ratio == 13: # 16:12.8 = 5:4
- strRatio = '5:4'
- else: # let's just hope this will never be 14 or more...
- strRatio = '16:%d' % ratio
- return '%dx%d (%s)' %(w, h, strRatio)
+# Make sure the backlight is turned on
+def turnOnBacklight():
+ try:
+ backlight = float(subprocess.check_output(["xbacklight", "-get"]).strip())
+ if backlight == 0: # it's completely turned off, we better enable it
+ subprocess.check_call(["xbacklight", "-set", "100"])
+ except FileNotFoundError:
+ print("xbacklight has not been found, unable to turn your laptop backlight on.")
+ except subprocess.CalledProcessError:
+ print("xbacklight returned an error while attempting to turn your laptop backlight on.")
-# return the first available connector from those listed in tryConnectors, skipping disabled connectors
-def findAvailableConnector(tryConnectors, allConnectors):
- for connector in tryConnectors:
- if connector in allConnectors and allConnectors[connector]: # if the connector exists and is active (i.e. there is a resolution)
- return connector
- return None
-# Return a (internalConnector, externalConnectors) pair: The name of the internal connector, and a list of external connectors.
-# Use the config file at ~/.dsl.conf and fall back to auto-detection
-def classifyConnectors(allConnectors):
- config = loadConfigFile(os.getenv('HOME') + '/.dsl.conf')
- # find internal connector
+# return the current sceen situation, using the configuration to control connecor detection
+def situationByConfig(config):
+ # internal connectors
if 'internalConnector' in config:
if len(config['internalConnector']) != 1:
raise Exception("You must specify exactly one internal connector.")
- internalConnector = config['internalConnector'][0]
- if not internalConnector in allConnectors:
- raise Exception("Connector %s does not exist, there is an error in your config file." % internalConnector)
- else:
- # auto-config
- internalConnector = findAvailableConnector(commonInternalConnectorNames, allConnectors)
- if internalConnector is None:
- raise Exception("Could not automatically find internal connector, please use ~/.dsl.conf to specify it manually.")
- # all the rest is external then, obviously - unless the user wants to do that manually
- if 'externalConnectors' in config:
- externalConnectors = config['externalConnectors']
- for connector in externalConnectors:
- if not connector in allConnectors:
- raise Exception("Connector %s does not exist, there is an error in your config file." % connector)
- if connector == internalConnector:
- raise Exception("%s is both internal and external, that doesn't make sense." % connector)
+ internalConnectors = config['internalConnector']
else:
- externalConnectors = list(allConnectors.keys())
- externalConnectors.remove(internalConnector)
- if not externalConnectors:
- raise Exception("No external connector found - either your config is wrong, or your machine has only one connector.")
- # done!
- return (internalConnector, externalConnectors)
+ internalConnectors = commonInternalConnectorNames()
+ # run!
+ return screen.ScreenSituation(internalConnectors, config.get('externalConnectors'))
+
# if we run top-level
if __name__ == "__main__":
try:
+ # how do we filter the RelativeScreenPosition for the CLI?
+ relPosFilter = str.lower
+
# parse command-line arguments
parser = argparse.ArgumentParser(description='easy Display Setup for Laptops')
parser.add_argument("-f", "--frontend",
dest="frontend",
help="The frontend to be used for user interaction")
parser.add_argument("-r", "--relative-position",
- dest="rel_position", choices=('left', 'right', 'external-only'),
- help="Position of external screen relative to internal one")
+ dest="rel_position", choices=list(map(relPosFilter, screen.RelativeScreenPosition.__members__.keys())),
+ help="Set the position of external screen relative to internal one.")
+ parser.add_argument("-e", "--external-only",
+ dest="external_only", action='store_true',
+ help="If an external screen is connected, disable all the others.")
parser.add_argument("-i", "--internal-only",
dest="internal_only", action='store_true',
- help="Enable internal screen, disable all the others (as if no external screen was connected")
+ help="Enable internal screen, disable all the others.")
cmdArgs = parser.parse_args()
+
+ # load frontend early (for error mssages)
+ frontend = gui.getFrontend(cmdArgs.frontend)
- # load frontend
- frontend = getFrontend(cmdArgs.frontend)
-
- # load connectors and classify them
- connectors = getXrandrInformation()
- (internalConnector, externalConnectors) = classifyConnectors(connectors)
+ # load configuration
+ config = loadConfigFile(os.getenv('HOME') + '/.dsl.conf')
- # default: screen off
- connectorArgs = {} # maps connector names to xrand arguments
- for c in externalConnectors+[internalConnector]:
- connectorArgs[c] = ["--off"]
+ # see what situation we are in
+ situation = situationByConfig(config)
- # check whether we got an external screen or not
- # Check what to do
- usedExternalConnector = findAvailableConnector(externalConnectors, connectors) # *the* external connector which is actually used
- hasExternal = not cmdArgs.internal_only and usedExternalConnector is not None
- if hasExternal:
- # there's an external screen connected, we need to get a setup
- if cmdArgs.rel_position is not None:
- # use command-line arguments (can we do this relPosition stuff more elegant?)
- if cmdArgs.rel_position == 'left':
- relPosition = RelativeScreenPosition.LEFT
- elif cmdArgs.rel_position == 'right':
- relPosition = RelativeScreenPosition.RIGHT
+ # construct the ScreenSetup
+ setup = None
+ if not cmdArgs.internal_only and situation.externalResolutions() is not None:
+ # there's an external screen connected that we may want to use
+ if cmdArgs.external_only:
+ setup = screen.ScreenSetup(intResolution = None, extResolution = situation.externalResolutions()[0])
+ elif cmdArgs.rel_position is not None:
+ # construct automatically, based on CLI arguments
+ # first, figure out the desired RelativeScreenPosition... waht a bad hack...
+ relPos = list(filter(lambda relPosItem: relPosFilter(relPosItem[0]) == cmdArgs.rel_position, screen.RelativeScreenPosition.__members__.items()))
+ assert len(relPos) == 1, "CLI argument is ambigue"
+ relPos = relPos[0][1]
+ # now we construct the ScreenSetup
+ if relPos == screen.RelativeScreenPosition.MIRROR:
+ res = situation.commonResolutions()[0]
+ setup = screen.ScreenSetup(res, res, relPos)
else:
- relPosition = RelativeScreenPosition.EXTERNAL_ONLY
- setup = ScreenSetup(relPosition, connectors[internalConnector][0], connectors[usedExternalConnector][0]) # use default resolutions
+ setup = screen.ScreenSetup(intResolution = situation.internalResolutions()[0], extResolution = situation.externalResolutions()[0], relPosition = relPos)
else:
- # use GUI
- setup = frontend.setup(connectors[internalConnector], connectors[usedExternalConnector])
- if setup is None: sys.exit(1) # the user canceled
- # apply it
- connectorArgs[internalConnector] = setup.getInternalArgs()
- connectorArgs[usedExternalConnector] = setup.getExternalArgs(internalConnector)
+ # ask the user
+ setup = frontend.setup(situation)
+ if setup is None: sys.exit(1) # the user canceled
else:
# use first resolution of internal connector
- connectorArgs[internalConnector] = ["--mode", res2xrandr(connectors[internalConnector][0]), "--primary"]
+ setup = screen.ScreenSetup(intResolution = situation.internalResolutions()[0], extResolution = None)
- # and do it
- call = ["xrandr"]
- for name in connectorArgs:
- call += ["--output", name] + connectorArgs[name]
- print("Call that will be made:",call)
- subprocess.check_call(call)
+ # call xrandr
+ xrandrCall = situation.forXrandr(setup)
+ print("Call that will be made:",xrandrCall)
+ subprocess.check_call(xrandrCall)
# make sure the internal screen is really, *really* turned on if there is no external screen
- if not hasExternal:
- backlight = float(subprocess.check_output(["xbacklight", "-get"]).strip())
- if backlight == 0: # it's completely turned off, we better enable it
- subprocess.check_call(["xbacklight", "-set", "100"])
+ if setup.extResolution is None:
+ turnOnBacklight()
except Exception as e:
frontend.error(str(e))
raise
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