From: Antonio Ossa-Guerra <aaossa@uc.cl>
Date: Sat, 12 Nov 2022 01:05:36 +0000 (-0300)
Subject: Remove whitespaces of whitespace-only files (#3348)
X-Git-Url: https://git.madduck.net/etc/vim.git/commitdiff_plain/d97b7898b34b67eb3c6839998920e17ac8c77908?ds=sidebyside;hp=d97b7898b34b67eb3c6839998920e17ac8c77908

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>
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