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Remove whitespaces of whitespace-only files #3348

Merged
merged 7 commits into from
Nov 12, 2022
Merged

Commits on Oct 21, 2022

  1. Remove whitespaces of whitespace-only files

    Currently, empty and whitespace-only (with or without newlines) are
    not modified. In some discussions (issues and pull requests) consesus
    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 <[email protected]>
    aaossa committed Oct 21, 2022
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Commits on Oct 24, 2022

  1. Test expected behavior on whitespace-only input

    This commit introduces two tests and modifies other two tests. The
    introduced tests verify the expected behaviour on files containing a
    single newline character via 1) `format_str` and 2)
    `format_file_in_place`. In the other hand, the first modified test
    (`test_format_file_contents`) verify that `NothingChanged` is raised
    on files containing only a single newline, and that whitespace-only
    files are properly formatted to a single newline character. The second
    modified test (`test_reformat_one_with_stdin_empty`) validates the
    expected behavior when the input is passed via stdin.
    
    Before the fix introduced in the previous commit, these tests (and a
    couple of others) failed on cases covering whitespace-only files. Now,
    these tests are passed for all cases.
    
    Signed-off-by: Antonio Ossa Guerra <[email protected]>
    aaossa committed Oct 24, 2022
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  2. Update CHANGES.md

    Add entry about new behavior on whitespace-only files: removing
    whitespace characters and return a single newline (if present) or an
    empty file
    
    Signed-off-by: Antonio Ossa Guerra <[email protected]>
    aaossa committed Oct 24, 2022
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Commits on Oct 26, 2022

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Commits on Nov 11, 2022

  1. Move whitespace-only behavior to preview style

    The new criteria to reformat empty and whitespace-only files should go
    into the preview style
    
    Signed-off-by: Antonio Ossa Guerra <[email protected]>
    aaossa committed Nov 11, 2022
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  2. Minor improvements on code readability

    Adding comments on a non-intuitive behavior ar `_format_str_once`, and
    improving the `test_one_empty_line` test readability by using a
    pre-defined function that implements the same assertions
    
    Signed-off-by: Antonio Ossa Guerra <[email protected]>
    aaossa committed Nov 11, 2022
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