Moved the generation of workflow list from dialogs.py to workflow.py, as

a step in the process of making command line options to the program.

system/workflow.py

@@ -1,6 +1,48 @@
 
 import gtk
 import logger
+import sys
+import os
+
+def _workflow_classes(modname):
+    """Returns a list of all subclasses of Workflow in a given module"""
+    workflow_classes = []
+
+    __import__('workflows.%s' % modname)
+    module = sys.modules['workflows.%s' % modname]
+
+    d = module.__dict__
+    for wf in d.values():
+        try:
+            if issubclass(wf, Workflow):
+                workflow_classes.append(wf)
+        except TypeError, e:
+            pass
+    return workflow_classes
+        
+def workflow_list():
+    """Returns a ListStore containing all new workflows"""
+    retval = []
+
+    # List all .py files that can contain workflow classes
+    wf_path = sys.modules['workflows'].__path__
+    wf_files = []
+
+    for dir in wf_path:
+        for fn in os.listdir(dir):
+            if fn.endswith('.py') and ('#' not in fn):
+                wf_files.append(fn[:-3])
+
+    # Try to load each file and look for Workflow derived classes
+    for fn in wf_files:
+        try:
+            for wf in _workflow_classes(fn):
+                retval.append(wf)
+        except Exception, e:
+            logger.log('warning', 'Cannot load workflow: %s' % fn)
+            logger.log('warning', e)
+
+    return retval
 
 class Workflow:
     """Defines a workflow that contains a set of analysis stages.