Provide a library function/method for converting a glob to an uncompiled regex string.

[kwlzn]

currently, the way to get a regex string for a given gitignore-style glob is:

>>> pathspec.GitIgnorePattern('/dist/').regex.pattern
'^dist/.*$'

which incurs the glob->regex translation inside GitIgnorePattern.__init__ which in turn calls RegexPattern.__init__ which automatically compiles the regex.

for the simple case of just wanting to convert a glob into a non-compiled regex string, it'd be great to have a utility function/method that could both be used inside GitIgnorePattern.__init__ and outside as part of the public API.

[cpburnz]

I could make a class method part of RegexPattern to convert the glob patterns to the regular expression strings.

@classmethod
def pattern_to_regex(cls, pattern) -> (regex, include)

GitIgnorePattern would then implement it and use it inside of its __init__(). If you want access to the raw regex string, you could acquire it via:

>>> pathspec.GitIgnorePattern.pattern_to_regex('/dist/')
('^dist/.*$', True)

[kwlzn]

sgtm!

[cpburnz]

@kwlzn This has been implemented.

[kwlzn]

@cpburnz awesome, thank you!