83 lines
2.6 KiB
Python
83 lines
2.6 KiB
Python
# -*- coding: iso-8859-1 -*-
|
|
# Copyright (C) 2012 Bastian Kleineidam
|
|
"""
|
|
Functions to load plugin modules.
|
|
"""
|
|
import os
|
|
import sys
|
|
import zipfile
|
|
import importlib
|
|
|
|
|
|
def is_frozen ():
|
|
"""Return True if running inside a py2exe-generated executable."""
|
|
return hasattr(sys, "frozen")
|
|
|
|
|
|
def get_modules(folder='plugins'):
|
|
"""Find all valid modules in the plugins subdirectory. A valid module
|
|
must have a .py extension, and is importable.
|
|
@return: all loaded valid modules
|
|
@rtype: iterator of module
|
|
"""
|
|
if is_frozen():
|
|
# find modules in library.zip filename
|
|
zipname = os.path.dirname(os.path.dirname(__file__))
|
|
with zipfile.ZipFile(zipname, 'r') as f:
|
|
prefix = "dosagelib/%s/" % folder
|
|
modnames = [os.path.splitext(n[len(prefix):])[0]
|
|
for n in f.namelist()
|
|
if n.startswith(prefix) and "__init__" not in n]
|
|
else:
|
|
dirname = os.path.join(os.path.dirname(__file__), folder)
|
|
modnames = get_importable_modules(dirname)
|
|
for modname in modnames:
|
|
try:
|
|
name ="..%s.%s" % (folder, modname)
|
|
yield importlib.import_module(name, __name__)
|
|
except ImportError as msg:
|
|
print "ERROR: could not load module %s: %s" % (modname, msg)
|
|
|
|
|
|
def get_importable_modules(folder):
|
|
"""Find all module files in the given folder that end with '.py' and
|
|
don't start with an underscore.
|
|
@return module names
|
|
@rtype: iterator of string
|
|
"""
|
|
for fname in sorted(os.listdir(folder)):
|
|
if fname.endswith('.py') and not fname.startswith('_'):
|
|
yield fname[:-3]
|
|
|
|
|
|
def get_plugins(modules, classobj):
|
|
"""Find all scrapers in all modules.
|
|
@param modules: the modules to search
|
|
@ptype modules: iterator of modules
|
|
@return: found scrapers
|
|
@rytpe: iterator of class objects
|
|
"""
|
|
for module in modules:
|
|
for plugin in get_module_plugins(module, classobj):
|
|
yield plugin
|
|
|
|
|
|
def get_module_plugins(module, classobj):
|
|
"""Return all subclasses of _BasicScraper in the module.
|
|
If the module defines __all__, only those entries will be searched,
|
|
otherwise all objects not starting with '_' will be searched.
|
|
"""
|
|
try:
|
|
names = module.__all__
|
|
except AttributeError:
|
|
names = [x for x in vars(module) if not x.startswith('_')]
|
|
for name in sorted(names):
|
|
try:
|
|
obj = getattr(module, name)
|
|
except AttributeError:
|
|
continue
|
|
try:
|
|
if issubclass(obj, classobj):
|
|
yield obj
|
|
except TypeError:
|
|
continue
|