- Improved error handling.

gui/Gui/Attackwindow.py

@@ -31,7 +31,10 @@ class AttackDisplay(wx.ScrolledWindow):
         # [CC][X] The below statement might be iffy on older versions.
         # (Python 2.3? What settings?)
         # Cf. bug report Vimal Subra
-        self.SetBackgroundColour(wx.Colour(255,255,255))
+        try:
+            self.SetBackgroundColour(wx.Colour(255,255,255))
+        except:
+            pass
 
         self.Bind(wx.EVT_SIZE, self.OnSize)
         self.Image = wx.StaticBitmap(self, -1, wx.EmptyBitmap(1,1))
@@ -137,8 +140,13 @@ class AttackDisplay(wx.ScrolledWindow):
 class AttackWindow(wx.Frame):
     def __init__(self,cl):
         super(AttackWindow, self).__init__(None, size=(800,800))
+
         # [CC][X] Same here; no background set for safety.
-        #self.SetBackgroundColour('Default')
+        try:
+            self.SetBackgroundColour('Default')
+        except:
+            pass
+
         self.claim = cl
 
         # TODO maybe fitting defaults should come from Preferences.

gui/Gui/Scytherthread.py

@@ -13,15 +13,15 @@ import StringIO
 #---------------------------------------------------------------------------
 
 """ Import scyther components """
-import Scyther.XMLReader as XMLReader
-import Scyther.Claim as Claim
-import Scyther.Scyther as Scyther
+import Scyther.Scyther
+import Scyther.Error
 
 """ Import scyther-gui components """
 import Tempfile
 import Preference
 import Attackwindow
 import Icon
+import Error
 
 #---------------------------------------------------------------------------
 if Preference.usePIL():
@@ -54,7 +54,8 @@ class ScytherThread(threading.Thread):
         """ Convert spdl to result (using Scyther)
         """
 
-        scyther = Scyther.Scyther()
+        scyther = Scyther.Scyther.Scyther()
+
         scyther.options = self.options
         scyther.setInput(self.spdl)
 
@@ -496,10 +497,18 @@ class ScytherRun(object):
         self.verifywin.Center()
         self.verifywin.Show(True)
 
+        # Check sanity of Scyther thing here (as opposed to the thread)
+        # which makes error reporting somewhat easier
+        try:
+            Scyther.Scyther.Check()
+        except Scyther.Error.BinaryError, e:
+            # e.file is the supposed location of the binary
+            text = "Could not find Scyther binary at\n%s" % (e.file)
+            Error.ShowAndExit(text)
+        
         # start the thread
         
         self.verifywin.SetCursor(wx.StockCursor(wx.CURSOR_WAIT))
-
         t = ScytherThread(self.spdl, self.options, self.verificationDone)
         t.start()
 

gui/Scyther/Scyther.py

@@ -16,10 +16,19 @@ import tempfile
 
 """ Import scyther components """
 import XMLReader
+import Error
 from Misc import *
 
 #---------------------------------------------------------------------------
 
+"""
+Globals
+"""
+
+FirstCheck = True
+
+#---------------------------------------------------------------------------
+
 """
 The default path for the binaries is set in __init__.py in the (current)
 directory 'Scyther'.
@@ -37,6 +46,39 @@ def getBinDir():
 
 #---------------------------------------------------------------------------
 
+def Check():
+    """
+    Various dynamic checks that can be performed before starting the
+    backend.
+    """
+
+    global FirstCheck
+
+    # First time
+    if FirstCheck:
+        """
+        Perform any checks that only need to be done the first time.
+        """
+        FirstCheck = False
+
+    # Every time
+    
+    # Check Scyther backend program availability
+    program = getScytherBackend()
+    CheckSanity(program)
+
+#---------------------------------------------------------------------------
+
+def CheckSanity(program):
+    """
+    This is where the existence is checked of the Scyther backend.
+    """
+
+    if not os.path.isfile(program):
+        raise Error.BinaryError, program
+
+#---------------------------------------------------------------------------
+
 def getScytherBackend():
     # Where is my executable?
     #
@@ -47,12 +89,12 @@ def getScytherBackend():
         """ linux """
         scythername = "scyther-linux"
 
-    elif "darwin" in sys.platform:
+    # elif "darwin" in sys.platform:
 
-        """ OS X """
-        # Preferably, we test for architecture (PPC/Intel) until we
-        # know how to build a universal binary
-        scythername = "scyther-osx"
+    #     """ OS X """
+    #     # Preferably, we test for architecture (PPC/Intel) until we
+    #     # know how to build a universal binary
+    #     scythername = "scyther-osx"
 
     elif sys.platform.startswith('win'):
 
@@ -62,14 +104,9 @@ def getScytherBackend():
     else:
 
         """ Unsupported"""
-        print "ERROR: I'm sorry, the %s platform is unsupported at the moment" % (sys.platform)
-        sys.exit()
+        raise Error.UnknownPlatformError, sys.platform
 
     program = os.path.join(getBinDir(),scythername)
-    if not os.path.isfile(program):
-        print "I can't find the Scyther executable at %s" % (program)
-        return None
-
     return program
 
 #---------------------------------------------------------------------------

gui/Scyther/__init__.py

@@ -9,3 +9,4 @@ import os.path
 
 bindir = os.path.join(__path__[0],"Bin")
 Scyther.setBinDir(bindir)
+