How can I set python-black to format only extra newlines?

[avatar-lavventura]

I was wondering would it be possible to set python-black only to remove the extra new-lines?

Following link was dead I was not able to open it: https://black.readthedocs.io/en/stable/pyproject_toml.html

[wbolster]

i do not understand your question/problem. please give more details and examples

i've fixed the broken link in the readme in 01f1f4269136cfb36938567854383628730faaab

[avatar-lavventura]

I want to use python-black inside emacs only to fix extra new lines and nothing else, if possible.

Example:

def mkdir(path) -> None:
    if not os.path.isdir(path):
        os.makedirs(path)

def mkdirs(paths) -> None:
    for path in paths:
        mkdir(path)

converted into:

def mkdir(path) -> None:
    if not os.path.isdir(path):
        os.makedirs(path)

def mkdirs(paths) -> None:
    for path in paths:
        mkdir(path)

I just want to use this behavior of python-black inside emacs, is it possible?

[wbolster]

i still don't understand what this means:

and nothing else

this package (or actually, black itself) happily converts your example input into your example output. so what exactly doesn't work which you expect/wish to work?

[avatar-lavventura]

Actually main problem was after each save when python-black reformats a change the cursor location also changes to the location where the format occurs, which makes my job very difficult during coding. For that reason. I just want to apply convert formant only for removing extra new-lines.

• nothing else => example I don't want black to be applied on:

# in:

j = [1,
     2,
     3
]

# out:

j = [1, 2, 3]

[wbolster]

your example input is not black compliant so if you run black it will obviously change it. if you don't want that to happen on save, don't use the -on-save mode, e.g. use a shortcut instead to do it manually.

i am not sure what ‘removing extra newlines’ really means, but in any case black is an all-or-nothing approach (but see readme notes on black-macchiato for partial formatting) so doing only a subset of formatting is impossible.