euscan: plugin system for handlers

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

pym/euscan/handlers/__init__.py

@@ -1,6 +1,17 @@
-from euscan.handlers import generic, php, pypi, rubygem, kde, cpan, github
+import pkgutil
 
-handlers = [kde, php, pypi, rubygem, cpan, github, generic]
+# autoimport all modules in this directory and append them to handlers list
+handlers = []
+for loader, module_name, is_pkg in  pkgutil.walk_packages(__path__):
+    module = loader.find_module(module_name).load_module(module_name)
+    handlers.append(module)
+
+# sort handlers by priority (e.g.: generic should be run lastly)
+handlers = sorted(
+    handlers,
+    key=lambda handler: handler.PRIORITY,
+    reverse=True
+)
 
 
 def find_best_handler(cpv, url):

pym/euscan/handlers/cpan.py

@@ -7,6 +7,7 @@ from euscan import helpers, output
 
 HANDLER_NAME = "cpan"
 CONFIDENCE = 100.0
+PRIORITY = 100
 
 _cpan_package_name_re = re.compile("mirror://cpan/authors/.*/([^/.]*).*")
 

pym/euscan/handlers/generic.py

@@ -14,6 +14,7 @@ from euscan import CONFIG, SCANDIR_BLACKLIST_URLS, \
 
 HANDLER_NAME = "generic"
 CONFIDENCE = 50.0
+PRIORITY = 0
 
 BRUTEFORCE_HANDLER_NAME = "brute_force"
 BRUTEFORCE_CONFIDENCE = 30.0

pym/euscan/handlers/github.py

@@ -1,4 +1,5 @@
-import json, urllib2
+import json
+import urllib2
 import re
 
 import portage
@@ -7,16 +8,20 @@ from euscan import helpers, output
 
 HANDLER_NAME = "github"
 CONFIDENCE = 100.0
+PRIORITY = 100
+
 
 def can_handle(cpv, url):
     return url.startswith('mirror://github/')
 
+
 def guess_package(cp, url):
     match = re.search('^mirror://github/(.*?)/(.*?)/(.*)$', url)
 
     assert(match)
     return (match.group(1), match.group(2), match.group(3))
 
+
 def scan(cpv, url):
     'http://developer.github.com/v3/repos/downloads/'
 
@@ -46,5 +51,6 @@ def scan(cpv, url):
                 continue
             yield (dl['html_url'], pv, HANDLER_NAME, CONFIDENCE)
 
+
 def brute_force(cpv, url):
     return []

pym/euscan/handlers/kde.py

@@ -1,5 +1,7 @@
 from euscan.handlers import generic
 
+PRIORITY = 100
+
 HANDLER_NAME = "kde"
 
 

pym/euscan/handlers/php.py

@@ -7,6 +7,7 @@ from euscan import helpers, output
 
 HANDLER_NAME = "php"
 CONFIDENCE = 100.0
+PRIORITY = 100
 
 
 def can_handle(cpv, url):

pym/euscan/handlers/pypi.py

@@ -7,6 +7,7 @@ from euscan import helpers, output
 
 HANDLER_NAME = "pypi"
 CONFIDENCE = 100.0
+PRIORITY = 100
 
 
 def can_handle(cpv, url):

pym/euscan/handlers/rubygem.py

@@ -7,6 +7,7 @@ from euscan import helpers, output
 
 HANDLER_NAME = "rubygem"
 CONFIDENCE = 100.0
+PRIORITY = 100
 
 
 def can_handle(cpv, url):