let the GUI module directly return a ScreenSetup instance

[lilass.git] / dsl.py

diff --git a/dsl.py b/dsl.py
index 47c906ef11bce2aa2edf239fceacaeda00e95aac..52bcd08bcccf9b8c89e3b7650509b098841a586b 100755 (executable)
--- a/dsl.py
+++ b/dsl.py
@@ -1,18 +1,69 @@
 #!/usr/bin/python
 # DSL - easy Display Setup for Laptops
 #!/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 (gpl.txt); if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 
 

-import os, sys, re, subprocess
-from PyQt4 import QtGui
-from selector_window import PositionSelection
-app = QtGui.QApplication(sys.argv)
+import 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
 
 # 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:
        # read config file
        linenr = 0
        with open(file) as file:

-               result = {}

                for line in file:
                        linenr += 1
                        line = line.strip()
                for line in file:
                        linenr += 1
                        line = line.strip()


@@ -21,20 +72,26 @@ def loadConfigFile(file):
                                # parse line
                                pos = line.index("=") # will raise exception when substring is not found
                                curKey = line[:pos].strip()
                                # parse line
                                pos = line.index("=") # will raise exception when substring is not found
                                curKey = line[:pos].strip()

-                               value = line[pos+1:]
-                               result[curKey] = shlex.split(value)
+                               result[curKey] = shlex.split(line[pos+1:]) # shlex.split also strips

                        except Exception:
                        except Exception:

-                               raise Exception("Invalid config, line %d: Error parsing line (quoting issue?)" % linenr)
+                               raise Exception("Invalid config, line %d: Error parsing line (may be a quoting issue)." % linenr)

        # add some convencience get functions
        return result
 
        # 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:
 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?
                # 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:
                        connector = m.groups()[0]
                        assert connector not in connectors


@@ -45,14 +102,23 @@ def getXrandrInformation():
                if m is not None:
                        assert connector is not None
                        connectors[connector].append((int(m.groups()[0]), int(m.groups()[1])))
                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()
        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
 
        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)
 
 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
 def res2user(res):
        (w, h) = res
        # get ratio


@@ -65,60 +131,77 @@ def res2user(res):
                strRatio = '16:%d' % ratio
        return '%dx%d (%s)' %(w, h, strRatio)
 
                strRatio = '16:%d' % ratio
        return '%dx%d (%s)' %(w, h, strRatio)
 

-def findAvailableConnector(tryConnectors, availableConnectors):
+# return the first available connector from those listed in tryConnectors, skipping disabled connectors
+def findAvailableConnector(tryConnectors, allConnectors):

        for connector in tryConnectors:
        for connector in tryConnectors:

-               if connector in availableConnectors: return connector
+               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 None
 

-# load options
-config = loadConfigFile(os.getenv('HOME') + '/.dsl.conf')
-if len(config['internalConnector']) != 1:
-       raise Exception("You must specify exactly one internal connector")
-if len(config['externalConnectors']) < 1:
-       raise Exception("You must specify at least one external connector")
-# use options
-internalConnector = config['internalConnector'][0]
-externalConnectors = config['externalConnectors']
-connectors = getXrandrInformation()
-usedExternalConnector = findAvailableConnector(externalConnectors, connectors) # *the* external connector which is actually used
-
-# default: screen off
-args = {} # maps connector names to xrand arguments
-for c in externalConnectors+[internalConnector]:
-       args[c] = ["--off"]
-
-# Check what to do
-if usedExternalConnector is not None: # there's an external screen connected, we need to ask what to do
-       internalResolutions = connectors[internalConnector]
-       externalResolutions = connectors[usedExternalConnector]
-       extPosition = PositionSelection(usedExternalConnector, 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[usedExternalConnector] = ["--mode", extResolution] # set external screen to desired resolution
-       if extPosition.extOnly.isChecked():
-               args[usedExternalConnector] += ["--primary"]
+# 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:
        else:

-               # there are two screens
-               args[internalConnector] = ["--mode", intResolution] # set internal screen to desired resolution
-               # set position
-               if extPosition.posLeft.isChecked():
-                       args[usedExternalConnector] += ["--left-of", internalConnector]
-               else:
-                       args[usedExternalConnector] += ["--right-of", internalConnector]
-               # set primary screen
-               if extPosition.primExt.isChecked():
-                       args[usedExternalConnector] += ["--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:
+               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:
+               # 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 ask what to do
+                       # get setup
+                       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:
                else:

-                       args[internalConnector] += ["--primary"]
-else:
-       # use first resolution
-       args[internalConnector] = ["--mode", res2xrandr(connectors[internalConnector][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