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(parent: c23a5c1) | patch
Remove whitespaces of whitespace-only files (#3348)
authorAntonio Ossa-Guerra <aaossa@uc.cl>
Sat, 12 Nov 2022 01:05:36 +0000 (22:05 -0300)
committerGitHub <noreply@github.com>
Sat, 12 Nov 2022 01:05:36 +0000 (20:05 -0500)
commitd97b7898b34b67eb3c6839998920e17ac8c77908
treeb4c81c9475219fff2056e1f7278b7e667e1542b9tree | snapshot
parentc23a5c15aac963b460fdb1327ae875aafafafd41commit | diff
Remove whitespaces of whitespace-only files (#3348)

Currently, empty and whitespace-only (with or without newlines) are
not modified. In some discussions (issues and pull requests) consensus
was to reformat whitespace-only files to empty or single-character
files, preserving line endings when possible. With that said, this
commit introduces the following behaviors:

* Empty files are left as is
* Whitespace-only files (no newline) reformat into empty files
* Whitespace-only files (1 or more newlines) reformat into a single
newline character

To implement these changes, we moved the initial check at
`format_file_contents` that raises `NothingChanged` if the source
(with no whitespaces) is an empty string. In the case of *.ipynb
files, `format_ipynb_string` checks a similar condition and removed
whitespaces. In the case of Python files, `format_str_once` includes a
check on the output that returns the correct newline character if
possible or an empty string otherwise.

Signed-off-by: Antonio Ossa Guerra <aaossa@uc.cl>
CHANGES.md diff | blob | history
src/black/__init__.py diff | blob | history
tests/data/preview/whitespace.py [new file with mode: 0644] blob
tests/test_black.py diff | blob | history
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