X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/c4bd2e31ceeac84d68592986fe70920f3d3d0443..5c064a986c388e2be1e448c3e4b28e5f5ba7ce5a:/docs/the_black_code_style/future_style.md diff --git a/docs/the_black_code_style/future_style.md b/docs/the_black_code_style/future_style.md index 6d289d4..f5fc364 100644 --- a/docs/the_black_code_style/future_style.md +++ b/docs/the_black_code_style/future_style.md @@ -51,7 +51,7 @@ with contextlib.ExitStack() as exit_stack: Experimental, potentially disruptive style changes are gathered under the `--preview` CLI flag. At the end of each year, these changes may be adopted into the default style, -as described in [The Black Code Style](./index.rst). Because the functionality is +as described in [The Black Code Style](index.md). Because the functionality is experimental, feedback and issue reports are highly encouraged! ### Improved string processing @@ -62,3 +62,100 @@ plain strings. User-made splits are respected when they do not exceed the line l limit. Line continuation backslashes are converted into parenthesized strings. Unnecessary parentheses are stripped. The stability and status of this feature is tracked in [this issue](https://github.com/psf/black/issues/2188). + +### Improved line breaks + +For assignment expressions, _Black_ now prefers to split and wrap the right side of the +assignment instead of left side. For example: + +```python +some_dict[ + "with_a_long_key" +] = some_looooooooong_module.some_looooooooooooooong_function_name( + first_argument, second_argument, third_argument +) +``` + +will be changed to: + +```python +some_dict["with_a_long_key"] = ( + some_looooooooong_module.some_looooooooooooooong_function_name( + first_argument, second_argument, third_argument + ) +) +``` + +### Improved parentheses management + +For dict literals with long values, they are now wrapped in parentheses. Unnecessary +parentheses are now removed. For example: + +```python +my_dict = { + my_dict = { + "a key in my dict": a_very_long_variable + * and_a_very_long_function_call() + / 100000.0, + "another key": (short_value), +} +``` + +will be changed to: + +```python +my_dict = { + "a key in my dict": ( + a_very_long_variable * and_a_very_long_function_call() / 100000.0 + ), + "another key": short_value, +} +``` + +### Improved multiline string handling + +_Black_ is smarter when formatting multiline strings, especially in function arguments, +to avoid introducing extra line breaks. Previously, it would always consider multiline +strings as not fitting on a single line. With this new feature, _Black_ looks at the +context around the multiline string to decide if it should be inlined or split to a +separate line. For example, when a multiline string is passed to a function, _Black_ +will only split the multiline string if a line is too long or if multiple arguments are +being passed. + +For example, _Black_ will reformat + +```python +textwrap.dedent( + """\ + This is a + multiline string +""" +) +``` + +to: + +```python +textwrap.dedent("""\ + This is a + multiline string +""") +``` + +And: + +```python +MULTILINE = """ +foobar +""".replace( + "\n", "" +) +``` + +to: + +```python +MULTILINE = """ +foobar +""".replace("\n", "") +```