#!/usr/bin/python
# DSL - easy Display Setup for Laptops
+# Copyright (C) 2012 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
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-import sys, re, subprocess
-from PyQt4 import QtGui
-from selector_window import PositionSelection
-app = QtGui.QApplication(sys.argv)
+import argparse, sys, os, re, subprocess
+import gui
+# 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
+
+# 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(file):
+ import shlex
+ result = {}
+ if not os.path.exists(file):
+ return result # no config file
+ # read config file
+ linenr = 0
+ with open(file) as file:
+ for line in file:
+ linenr += 1
+ line = line.strip()
+ if not len(line) or line.startswith("#"): continue # skip empty and comment lines
+ try:
+ # parse line
+ pos = line.index("=") # will raise exception when substring is not found
+ curKey = line[:pos].strip()
+ result[curKey] = shlex.split(line[pos+1:]) # shlex.split also strips
+ except Exception:
+ raise Exception("Invalid config, line %d: Error parsing line (may be a quoting issue)." % linenr)
+ # add some convencience get functions
+ return result
+
+# 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():
p = subprocess.Popen(["xrandr", "-q"], stdout=subprocess.PIPE)
connectors = {} # map of connector names to a list of resolutions
connector = None # current connector
for line in p.stdout:
+ # 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]+) connected ', line)
+ m = re.search(r'^([\w\-]+) (dis)?connected ', line)
if m is not None:
connector = m.groups()[0]
assert connector not in connectors
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
+ # be sure to always proprly finish up with the xrandr
p.communicate()
- if p.returncode != 0: raise Exception("Querying xrandr for data failed")
+ # if everything succeededso far, check return code
+ if p.returncode != 0: raise Exception("Querying xrandr for data failed.")
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
strRatio = '16:%d' % ratio
return '%dx%d (%s)' %(w, h, strRatio)
-# Check screen setup
-internalName = "LVDS1"
-externalNames = ["HDMI1", "DP1", "VGA1"]
-connectors = getXrandrInformation()
-internalResolutions = connectors[internalName] # there must be a screen assoicated to the internal connector
-externalName = None # *the* external connector which is actually used
-externalResolutions = None # resultions of the external connector
-args = {} # maps connector names to xrand arguments
+# 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
-# look for enabled external screen, disable all the others
-for name in externalNames:
- if externalResolutions is None and name in connectors:
- externalName = name
- externalResolutions = connectors[name]
+# 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
+ 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:
- args[name] = ["--off"]
-
-# Check what to do
-if externalName is not None: # we need to ask what to do
- extPosition = PositionSelection(externalName, map(res2user, internalResolutions), map(res2user, externalResolutions))
- extPosition.exec_()
- if not extPosition.result(): sys.exit(1) # the user canceled
- extResolution = res2xrandr(externalResolutions[extPosition.extResolutions.currentIndex()])
- intResolution = res2xrandr(internalResolutions[extPosition.intResolutions.currentIndex()])
- # build command-line
- args[externalName] = ["--mode", extResolution] # we definitely want an external screen
- if extPosition.extOnly.isChecked():
- args[internalName] = ["--off"]
- args[externalName] += ["--primary"]
+ # 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)
else:
- # there are two screens
- args[internalName] = ["--mode", intResolution]
- if extPosition.posLeft.isChecked():
- args[externalName] += ["--left-of", internalName]
- else:
- args[externalName] += ["--right-of", internalName]
- if extPosition.primExt.isChecked():
- args[externalName] += ["--primary"]
+ externalConnectors = 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)
+
+# if we run top-level
+if __name__ == "__main__":
+ try:
+ # parse command-line arguments
+ parser = argparse.ArgumentParser(description='easy Display Setup for Laptops')
+ parser.add_argument("-r, --relative-position",
+ dest="rel_position", choices=('left', 'right', 'external-only'),
+ help="Position of external screen relative to internal one")
+ cmdArgs = parser.parse_args()
+
+ # load connectors and classify them
+ connectors = getXrandrInformation()
+ (internalConnector, externalConnectors) = classifyConnectors(connectors)
+
+ # default: screen off
+ connectorArgs = {} # maps connector names to xrand arguments
+ for c in externalConnectors+[internalConnector]:
+ connectorArgs[c] = ["--off"]
+
+ # check whether we got an external screen or not
+ # Check what to do
+ usedExternalConnector = findAvailableConnector(externalConnectors, connectors) # *the* external connector which is actually used
+ if usedExternalConnector is not None:
+ # 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
+ else:
+ relPosition = RelativeScreenPosition.EXTERNAL_ONLY
+ setup = ScreenSetup(relPosition, connectors[internalConnector][0], connectors[usedExternalConnector][0]) # use default resolutions
+ else:
+ # use GUI
+ setup = gui.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)
else:
- args[internalName] += ["--primary"]
-else:
- args[internalName] = ["--mode", res2xrandr(internalResolutions[0]), "--primary"]
-# and do it
-call = ["xrandr"]
-for name in args:
- call += ["--output", name] + args[name]
-print "Call that will be made:",call
-subprocess.check_call(call)
+ # use first resolution of internal connector
+ connectorArgs[internalConnector] = ["--mode", res2xrandr(connectors[internalConnector][0]), "--primary"]
+
+ # 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)
+ except Exception as e:
+ gui.error(str(e))
+ raise
projects / lilass.git / blobdiff