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write cache in --check mode (#453)

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Fixes #448.

This diff makes us always write to the cache in normal mode, except
if the file is already in the cache, and it makes us write to the
cache in --check mode if the file is already well formatted.

I also fixed some related docstrings.

WriteBack.NO is now used only in tests.
This commit is contained in:
Jelle Zijlstra 2018-08-17 07:40:37 -07:00 committed by Łukasz Langa
parent cc48bc56ca
commit 9e15cacc67
1 changed files with 23 additions and 7 deletions
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30
black.py
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@ -94,11 +94,12 @@ class WriteBack(Enum):
NO = 0
YES = 1
DIFF = 2
CHECK = 3
@classmethod
def from_configuration(cls, *, check: bool, diff: bool) -> "WriteBack":
if check and not diff:
return cls.NO
return cls.CHECK
return cls.DIFF if diff else cls.YES
@ -398,7 +399,14 @@ def reformat_one(
mode=mode,
):
changed = Changed.YES
if write_back == WriteBack.YES and changed is not Changed.NO:
if write_back is WriteBack.YES:
should_write = changed is not Changed.CACHED
elif write_back is WriteBack.CHECK:
should_write = changed is Changed.NO
else:
should_write = False
if should_write:
write_cache(cache, [src], line_length, mode)
report.done(src, changed)
except Exception as exc:
@ -466,11 +474,17 @@ async def schedule_formatting(
elif task.exception():
report.failed(src, str(task.exception()))
else:
formatted.append(src)
report.done(src, Changed.YES if task.result() else Changed.NO)
changed = Changed.YES if task.result() else Changed.NO
# In normal mode, write all files to the cache.
if write_back is WriteBack.YES:
formatted.append(src)
# In check mode, write only unchanged files to the cache.
elif write_back is WriteBack.CHECK and changed is Changed.NO:
formatted.append(src)
report.done(src, changed)
if cancelled:
await asyncio.gather(*cancelled, loop=loop, return_exceptions=True)
if write_back == WriteBack.YES and formatted:
if write_back in (WriteBack.YES, WriteBack.CHECK) and formatted:
write_cache(cache, formatted, line_length, mode)
@ -484,7 +498,8 @@ def format_file_in_place(
) -> bool:
"""Format file under `src` path. Return True if changed.
If `write_back` is True, write reformatted code back to stdout.
If `write_back` is DIFF, write a diff to stdout. If it is YES, write reformatted
code to the file.
`line_length` and `fast` options are passed to :func:`format_file_contents`.
"""
if src.suffix == ".pyi":
@ -533,7 +548,8 @@ def format_stdin_to_stdout(
) -> bool:
"""Format file on stdin. Return True if changed.
If `write_back` is True, write reformatted code back to stdout.
If `write_back` is YES, write reformatted code back to stdout. If it is DIFF,
write a diff to stdout.
`line_length`, `fast`, `is_pyi`, and `force_py36` arguments are passed to
:func:`format_file_contents`.
"""