euscan: Adding support for disabling handlers

Signed-off-by: volpino <fox91@anche.no>

pym/euscan/__init__.py

@@ -7,6 +7,7 @@ __version__ = "git"
 
 import ConfigParser
 import os
+from ast import literal_eval
 
 
 CONFIG = {
@@ -29,6 +30,7 @@ CONFIG = {
     'ignore-pre-release': False,
     'ignore-pre-release-if-stable': False,
     'ebuild-uri': False,
+    'handlers-exclude': [],
 }
 
 config = ConfigParser.ConfigParser()
@@ -36,7 +38,7 @@ config.read(['/etc/euscan.conf', os.path.expanduser('~/.euscan.conf')])
 if config.has_section("euscan"):
     for key, value in config.items("euscan"):
         if key in CONFIG:
-            CONFIG[key] = value
+            CONFIG[key] = literal_eval(value)
 
 BLACKLIST_VERSIONS = [
     # Compatibility package for running binaries linked against a

pym/euscan/handlers/__init__.py

@@ -37,7 +37,8 @@ def find_best_handler(kind, pkg, *args):
     Find the best handler for the given package
     """
     for handler in handlers[kind]:
-        if handler.can_handle(pkg, *args):
+        if (handler.HANDLER_NAME not in CONFIG["handlers-exclude"] and
+            handler.can_handle(pkg, *args)):
             return handler
     return None
 
@@ -149,8 +150,11 @@ def scan_url(pkg, urls, options, on_progress=None):
 
             try:
                 url_handler = find_best_handler('url', pkg, url)
-                for o in options:
-                    versions += url_handler.scan_url(pkg, url, o)
+                if url_handler:
+                    for o in options:
+                        versions += url_handler.scan_url(pkg, url, o)
+                else:
+                    output.eerror("Can't find a suitable handler!")
             except Exception as e:
                 output.ewarn(
                     "Handler failed: [%s] %s" %