In #1082, _version.py was renamed to _black_version.py, but the
py_modules line in setup.py wasn't changed, which meant that when
installed from source, running it failed with something like:
```
Traceback (most recent call last):
File "~/.pyenv/versions/3.6.5/bin/black", line 5, in <module>
from black import patched_main
File "~/.pyenv/versions/3.6.5/lib/python3.6/site-packages/black.py", line 55, in <module>
from _black_version import version as __version__
ModuleNotFoundError: No module named '_black_version'
```
Some users are installing Black as a dependency in their project. Having
a _version.py in site-packages is asking for a conflict sooner or later.
Ideally we shouldn't require a separate version file at all, that's an
additional import we need to make. But I'll leave that bikeshedding for
a different time.
* add test for special unicode symbol which usual re can not process correctly
add regex lib which supports unicode 12.1.0 standard
replace re usage in project in favor to regex
* #455 fix dependency
Black will cache already formatted files using their file size and
modification timestamp. The cache is per-user and will always be used
unless Black is used with --diff or with code provided via standard
input.
* Normalize string quotes
Convert single-quoted strings to double-quoted. Convert triple single-quoted strings to triple double-quoted. Do not touch any strings where conversion would increase the number of backslashes.
Fixes#51.
* reformat Black itself
