abstract the dialogue away so it can be implementing using an abritrary GUI frontend...

[lilass.git] / dsl.py

diff --git a/dsl.py b/dsl.py
index d8d88c977dc38be086137a38c6aa7217d5a087b0..1c4ec1e867e2eef94d26ec7fdbf36716e0ac115b 100755 (executable)
--- a/dsl.py
+++ b/dsl.py
@@ -1,18 +1,68 @@
 #!/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 sys, re, subprocess
-from PyQt4 import QtGui
-from selector_window import PositionSelection
-app = QtGui.QApplication(sys.argv)
+import 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
+
+# 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 (quoting issue?)." % linenr)
+       # add some convencience get functions
+       return result

 
 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


@@ -23,8 +73,15 @@ 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
 
 def res2xrandr(res):
        return connectors
 
 def res2xrandr(res):


@@ -43,51 +100,89 @@ 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)
 

-# 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
+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]
+# the main function
+def main():
+       # load connectors and options
+       connectors = getXrandrInformation()
+       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 connectors:
+                       raise Exception("Connector %s does not exist, there is an error in your config file." % internalConnector)

        else:
        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, connectors)
+               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 connectors:
+                               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:
        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 = connectors.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.")
+
+       # default: screen off
+       args = {} # maps connector names to xrand arguments
+       for c in externalConnectors+[internalConnector]:
+               args[c] = ["--off"]
+
+       # 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
+               internalResolutions = connectors[internalConnector]
+               externalResolutions = connectors[usedExternalConnector]
+               dialogue = gui.getDialogue(usedExternalConnector, map(res2user, internalResolutions), map(res2user, externalResolutions))
+               if not dialogue.run(): sys.exit(1) # the user canceled
+               extResolution = res2xrandr(externalResolutions[dialogue.getExtResolutionIndex()])
+               intResolution = res2xrandr(internalResolutions[dialogue.getIntResolutionIndex()])
+               relPosition = dialogue.getRelativeScreenPosition()
+               # build command-line
+               args[usedExternalConnector] = ["--mode", extResolution] # set external screen to desired resolution
+               if relPosition == RelativeScreenPosition.EXTERNAL_ONLY:
+                       args[usedExternalConnector] += ["--primary"]

                else:
                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)
+                       # there are two screens
+                       args[internalConnector] = ["--mode", intResolution] # set internal screen to desired resolution
+                       # set position
+                       if relPosition == RelativeScreenPosition.LEFT:
+                               args[usedExternalConnector] += ["--left-of", internalConnector]
+                       else:
+                               args[usedExternalConnector] += ["--right-of", internalConnector]
+                       # set primary screen
+                       if dialogue.externalIsPrimary():
+                               args[usedExternalConnector] += ["--primary"]
+                       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)
+
+# if we run top-level
+if __name__ == "__main__":
+       try:
+               main()
+       except Exception as e:
+               gui.error(str(e))
+               raise