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#!/usr/bin/env python
"""
Miscellaneous functions/objects used by Cheetah but also useful standalone.
"""
import os # Used in mkdirsWithPyInitFile.
import sys # Used in die.
##################################################
## MISCELLANEOUS FUNCTIONS
def die(reason):
sys.stderr.write(reason + '\n')
sys.exit(1)
def useOrRaise(thing, errmsg=''):
"""Raise 'thing' if it's a subclass of Exception. Otherwise return it.
Called by: Cheetah.Servlet.cgiImport()
"""
if isinstance(thing, type) and issubclass(thing, Exception):
raise thing(errmsg)
return thing
def checkKeywords(dic, legalKeywords, what='argument'):
"""Verify no illegal keyword arguments were passed to a function.
in : dic, dictionary (**kw in the calling routine).
legalKeywords, list of strings, the keywords that are allowed.
what, string, suffix for error message (see function source).
out: None.
exc: TypeError if 'dic' contains a key not in 'legalKeywords'.
called by: Cheetah.Template.__init__()
"""
# XXX legalKeywords could be a set when sets get added to Python.
for k in dic.keys(): # Can be dic.iterkeys() if Python >= 2.2.
if k not in legalKeywords:
raise TypeError("'%s' is not a valid %s" % (k, what))
def removeFromList(list_, *elements):
"""Save as list_.remove(each element) but don't raise an error if
element is missing. Modifies 'list_' in place! Returns None.
"""
for elm in elements:
try:
list_.remove(elm)
except ValueError:
pass
def mkdirsWithPyInitFiles(path):
"""Same as os.makedirs (mkdir 'path' and all missing parent directories)
but also puts a Python '__init__.py' file in every directory it
creates. Does nothing (without creating an '__init__.py' file) if the
directory already exists.
"""
dir, fil = os.path.split(path)
if dir and not os.path.exists(dir):
mkdirsWithPyInitFiles(dir)
if not os.path.exists(path):
os.mkdir(path)
init = os.path.join(path, "__init__.py")
f = open(init, 'w') # Open and close to produce empty file.
f.close()
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