def __call__(self, *args):
"""Return a Unicode or whatever you passed in as the first arg
(hopefully a string of some kind).
When called with an int as the first arg, return an empty Unicode. An
int is a good hint that I am a ``ParametrizingString``, as there are
only about half a dozen string-returning capabilities on OS X's
terminfo man page which take any param that's not an int, and those are
seldom if ever used on modern terminal emulators. (Most have to do with
programming function keys. Blessings' story for supporting
non-string-returning caps is undeveloped.) And any parametrized
capability in a situation where all capabilities themselves are taken
to be blank are, of course, themselves blank.
When called with a non-int as the first arg (no no args at all), return
the first arg. I am acting as a ``FormattingString``.
"""
if len(args) != 1 or isinstance(args[0], int):
# I am acting as a ParametrizingString.
# tparm can take not only ints but also (at least) strings as its
# second...nth args. But we don't support callably parametrizing
# caps that take non-ints yet, so we can cheap out here. TODO: Go
# through enough of the motions in the capability resolvers to
# determine which of 2 special-purpose classes,
# NullParametrizableString or NullFormattingString, to return, and
# retire this one.
return u''
return args[0] # Should we force even strs in Python 2.x to be
# unicodes? No. How would I know what encoding to use
# to convert it?
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