added notice when grass help is not configured

git-svn-id: http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin@194 881b9c09-3ef8-f3c2-ec3d-21d735c97f4d

src/sextante/core/WrongHelpFileException.py

@@ -0,0 +1,5 @@
+class WrongHelpFileException(Exception):
+
+    def __init__(self, msg):
+        Exception.__init__(self)
+        self.msg = msg

src/sextante/grass/GrassAlgorithm.py

@@ -21,6 +21,7 @@
 from sextante.core.SextanteUtils import SextanteUtils
 from sextante.parameters.ParameterSelection import ParameterSelection
 from sextante.core.LayerExporter import LayerExporter
+from sextante.core.WrongHelpFileException import WrongHelpFileException
 
 class GrassAlgorithm(GeoAlgorithm):
 
@@ -40,10 +41,13 @@ def getIcon(self):
 
     def helpFile(self):
         folder = GrassUtils.grassHelpPath()
-        if str(folder).strip() != "":
-            helpfile = str(folder) + os.sep + self.grassName + ".html"
+        #if str(folder).strip() != "":
+        helpfile = str(folder) + os.sep + self.grassName + ".html"
+        if os.path.exists(helpfile):
             return helpfile
-        return None
+        else:
+            raise WrongHelpFileException("Grass help folder is not correctly configured.\nPlease configure it")
+        #return None
 
     def getParameterDescriptions(self):
         descs = {}

src/sextante/gui/ParametersDialog.py

@@ -27,6 +27,7 @@
 from sextante.outputs.OutputRaster import OutputRaster
 from sextante.outputs.OutputVector import OutputVector
 from sextante.outputs.OutputTable import OutputTable
+from sextante.core.WrongHelpFileException import WrongHelpFileException
 
 try:
     _fromUtf8 = QtCore.QString.fromUtf8
@@ -79,11 +80,14 @@ def setupUi(self, dialog, alg):
         QtCore.QMetaObject.connectSlotsByName(dialog)
 
     def showHelp(self):
-        if self.alg.helpFile():
-            dlg = HTMLViewerDialog(self.alg.helpFile())
-            dlg.exec_()
-        else:
-            QMessageBox.warning(self.dialog, "No help available", "No help is available for the current algorithm.")
+        try:
+            if self.alg.helpFile():
+                dlg = HTMLViewerDialog(self.alg.helpFile())
+                dlg.exec_()
+            else:
+                    QMessageBox.warning(self.dialog, "No help available", "No help is available for the current algorithm.")
+        except WrongHelpFileException, e:
+            QMessageBox.warning(self.dialog, "Help", e.msg)
 
 
     def setParamValues(self):

src/sextante/modeler/ModelerParametersDialog.py

@@ -23,6 +23,7 @@
 from sextante.parameters.ParameterFile import ParameterFile
 from sextante.outputs.OutputFile import OutputFile
 from sextante.gui.HTMLViewerDialog import HTMLViewerDialog
+from sextante.core.WrongHelpFileException import WrongHelpFileException
 
 class ModelerParametersDialog(QtGui.QDialog):
 
@@ -73,11 +74,14 @@ def setupUi(self):
         QtCore.QMetaObject.connectSlotsByName(self)
 
     def showHelp(self):
-        if self.alg.helpFile():
-            dlg = HTMLViewerDialog(self.alg.helpFile())
-            dlg.exec_()
-        else:
-            QMessageBox.warning(self.dialog, "No help available", "No help is available for this algorithm.")
+        try:
+            if self.alg.helpFile():
+                dlg = HTMLViewerDialog(self.alg.helpFile())
+                dlg.exec_()
+            else:
+                    QMessageBox.warning(self.dialog, "No help available", "No help is available for the current algorithm.")
+        except WrongHelpFileException, e:
+            QMessageBox.warning(self.dialog, "Help", e.msg)
 
     def getRasterLayers(self):
         layers = []