provide auto-configuration

diff --git a/dsl.py b/dsl.py
index 47c906ef11bce2aa2edf239fceacaeda00e95aac..d959b074f6a03fca43f9cb08274de227741fb114 100755 (executable)
--- a/dsl.py
+++ b/dsl.py
@@ -6,13 +6,18 @@ from PyQt4 import QtGui
 from selector_window import PositionSelection
 app = QtGui.QApplication(sys.argv)
 
+# for auto-config: common names of internal connectors
+commonInternalConnectorNames = ['LVDS', 'LVDS1']
+
 # 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:
-               result = {}
                for line in file:
                        linenr += 1
                        line = line.strip()
@@ -34,7 +39,7 @@ def getXrandrInformation():
        connector = None # current connector
        for line in p.stdout:
                # 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
@@ -65,22 +70,38 @@ def res2user(res):
                strRatio = '16:%d' % ratio
        return '%dx%d (%s)' %(w, h, strRatio)
 
-def findAvailableConnector(tryConnectors, availableConnectors):
+def findAvailableConnector(tryConnectors):
        for connector in tryConnectors:
-               if connector in availableConnectors: return connector
+               if connector in connectors and connectors[connector]: # if the connector exists and is active (i.e. there is a resolution)
+                       return connector
        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']
+# load connectors and options
 connectors = getXrandrInformation()
-usedExternalConnector = findAvailableConnector(externalConnectors, connectors) # *the* external connector which is actually used
+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:
+       # auto-config
+       internalConnector = findAvailableConnector(commonInternalConnectorNames)
+       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" % internalConnector)
+else:
+       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
@@ -88,6 +109,7 @@ for c in externalConnectors+[internalConnector]:
        args[c] = ["--off"]
 
 # Check what to do
+usedExternalConnector = findAvailableConnector(externalConnectors) # *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]