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"""
pkgdata is a simple, extensible way for a package to acquire data file
resources.
The getResource function is equivalent to the standard idioms, such as
the following minimal implementation:
import sys, os
def getResource(identifier, pkgname=__name__):
pkgpath = os.path.dirname(sys.modules[pkgname].__file__)
path = os.path.join(pkgpath, identifier)
return file(os.path.normpath(path), mode='rb')
When a __loader__ is present on the module given by __name__, it will defer
getResource to its get_data implementation and return it as a file-like
object (such as StringIO).
"""
__all__ = ['getResource']
import sys
import os
from cStringIO import StringIO
try:
from pkg_resources import resource_stream, resource_exists
except ImportError:
def resource_exists(package_or_requirement, resource_name):
return False
def resource_stream(package_of_requirement, resource_name):
raise NotImplementedError
def getResource(identifier, pkgname=__name__):
"""
Acquire a readable object for a given package name and identifier.
An IOError will be raised if the resource can not be found.
For example:
mydata = getResource('mypkgdata.jpg').read()
Note that the package name must be fully qualified, if given, such
that it would be found in sys.modules.
In some cases, getResource will return a real file object. In that
case, it may be useful to use its name attribute to get the path
rather than use it as a file-like object. For example, you may
be handing data off to a C API.
"""
if resource_exists(pkgname, identifier):
return resource_stream(pkgname, identifier)
mod = sys.modules[pkgname]
fn = getattr(mod, '__file__', None)
if fn is None:
raise IOError, "%r has no __file__!"
path = os.path.join(os.path.dirname(fn), identifier)
loader = getattr(mod, '__loader__', None)
if loader is not None:
try:
data = loader.get_data(path)
except IOError:
pass
else:
return StringIO(data)
return file(os.path.normpath(path), 'rb')
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