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"""macresource - Locate and open the resources needed for a script."""
from Carbon import Res
import os
import sys
class ArgumentError(TypeError): pass
class ResourceFileNotFoundError(ImportError): pass
def need(restype, resid, filename=None, modname=None):
"""Open a resource file, if needed. restype and resid
are required parameters, and identify the resource for which to test. If it
is available we are done. If it is not available we look for a file filename
(default: modname with .rsrc appended) either in the same folder as
where modname was loaded from, or otherwise across sys.path.
Returns the refno of the resource file opened (or None)"""
if modname is None and filename is None:
raise ArgumentError, "Either filename or modname argument (or both) must be given"
if type(resid) is type(1):
try:
h = Res.GetResource(restype, resid)
except Res.Error:
pass
else:
return None
else:
try:
h = Res.GetNamedResource(restype, resid)
except Res.Error:
pass
else:
return None
# Construct a filename if we don't have one
if not filename:
if '.' in modname:
filename = modname.split('.')[-1] + '.rsrc'
else:
filename = modname + '.rsrc'
# Now create a list of folders to search
searchdirs = []
if modname == '__main__':
# If we're main we look in the current directory
searchdirs = [os.curdir]
if sys.modules.has_key(modname):
mod = sys.modules[modname]
if hasattr(mod, '__file__'):
searchdirs = [os.path.split(mod.__file__)[0]]
if not searchdirs:
searchdirs = sys.path
# And look for the file
for dir in searchdirs:
pathname = os.path.join(dir, filename)
if os.path.exists(pathname):
break
else:
raise ResourceFileNotFoundError, filename
refno = Res.FSpOpenResFile(pathname, 1)
# And check that the resource exists now
if type(resid) is type(1):
h = Res.GetResource(restype, resid)
else:
h = Res.GetNamedResource(restype, resid)
return refno
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