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This avoids the unportable 5 pointer hack, but requires enumerating in
the callback.
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This will allow us to implement e.g. enumerator_cleaner without having to
use that unportable 5 pointer forwarding or having to define a callback for
each instance.
A generic implementation for enumerate() is provided so only venumerate()
has to be implemented, which may be simplified by using the VA_ARGS_VGET()
macro.
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While glob should return a NULL terminated gl_pathv when having no matches,
at least on OS X this is not true when using GLOB_DOOFFS. Rely on the
number of matches returned in gl_pathc, which seems to be more reliable in
error cases.
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This enumerator is a wrapper around glob(3). If that function is not
supported NULL is returned. If no files match or an error occurs during
the pattern expansion an error is logged and the enumerator simply returns
no items.
RFC: if GLOB_ERR is not supplied glob returns GLOB_NOMATCH if e.g. the
base directory of the pattern does not exist, which would otherwise
result in an error. This way there is at least a clear error message in
case of a typo.
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Since we always search for the nearest separator (and strip them from
the front of the next token) there can't be any separators left at the
end of a token.
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