X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/6417c99bfdbdc057e4a10aeff9967a751f4f85e9..6ae8457a8628345c59fed22c58728ffa258a3e76:/docs/the_black_code_style/current_style.md diff --git a/docs/the_black_code_style/current_style.md b/docs/the_black_code_style/current_style.md index 5be7ba6..3db49e2 100644 --- a/docs/the_black_code_style/current_style.md +++ b/docs/the_black_code_style/current_style.md @@ -2,11 +2,16 @@ ## Code style -_Black_ reformats entire files in place. Style configuration options are deliberately -limited and rarely added. It doesn't take previous formatting into account, except for -the magic trailing comma and preserving newlines. It doesn't reformat blocks that start -with `# fmt: off` and end with `# fmt: on`, or lines that ends with `# fmt: skip`. -`# fmt: on/off` have to be on the same level of indentation. It also recognizes +_Black_ aims for consistency, generality, readability and reducing git diffs. Similar +language constructs are formatted with similar rules. Style configuration options are +deliberately limited and rarely added. Previous formatting is taken into account as +little as possible, with rare exceptions like the magic trailing comma. The coding style +used by _Black_ can be viewed as a strict subset of PEP 8. + +_Black_ reformats entire files in place. It doesn't reformat lines that end with +`# fmt: skip` or blocks that start with `# fmt: off` and end with `# fmt: on`. +`# fmt: on/off` must be on the same level of indentation and in the same block, meaning +no unindents beyond the initial indentation level between them. It also recognizes [YAPF](https://github.com/google/yapf)'s block comments to the same effect, as a courtesy for straddling code. @@ -18,8 +23,7 @@ running `black --preview`. _Black_ ignores previous formatting and applies uniform horizontal and vertical whitespace to your code. The rules for horizontal whitespace can be summarized as: do -whatever makes `pycodestyle` happy. The coding style used by _Black_ can be viewed as a -strict subset of PEP 8. +whatever makes `pycodestyle` happy. As for vertical whitespace, _Black_ tries to render one full expression or simple statement per line. If this fits the allotted line length, great. @@ -81,6 +85,19 @@ def very_important_function( ... ``` +If a data structure literal (tuple, list, set, dict) or a line of "from" imports cannot +fit in the allotted length, it's always split into one element per line. This minimizes +diffs as well as enables readers of code to find which commit introduced a particular +entry. This also makes _Black_ compatible with +[isort](../guides/using_black_with_other_tools.md#isort) with the ready-made `black` +profile or manual configuration. + +You might have noticed that closing brackets are always dedented and that a trailing +comma is always added. Such formatting produces smaller diffs; when you add or remove an +element, it's always just one line. Also, having the closing bracket dedented provides a +clear delimiter between two distinct sections of the code that otherwise share the same +indentation level (like the arguments list and the docstring in the example above). + (labels/why-no-backslashes)= _Black_ prefers parentheses over backslashes, and will remove backslashes if found. @@ -123,19 +140,6 @@ If you're reaching for backslashes, that's a clear signal that you can do better slightly refactor your code. I hope some of the examples above show you that there are many ways in which you can do it. -You might have noticed that closing brackets are always dedented and that a trailing -comma is always added. Such formatting produces smaller diffs; when you add or remove an -element, it's always just one line. Also, having the closing bracket dedented provides a -clear delimiter between two distinct sections of the code that otherwise share the same -indentation level (like the arguments list and the docstring in the example above). - -If a data structure literal (tuple, list, set, dict) or a line of "from" imports cannot -fit in the allotted length, it's always split into one element per line. This minimizes -diffs as well as enables readers of code to find which commit introduced a particular -entry. This also makes _Black_ compatible with -[isort](../guides/using_black_with_other_tools.md#isort) with the ready-made `black` -profile or manual configuration. - ### Line length You probably noticed the peculiar default line length. _Black_ defaults to 88 characters @@ -396,16 +400,11 @@ recommended code style for those files is more terse than PEP 8: _Black_ enforces the above rules. There are additional guidelines for formatting `.pyi` file that are not enforced yet but might be in a future version of the formatter: -- all function bodies should be empty (contain `...` instead of the body); -- do not use docstrings; - prefer `...` over `pass`; -- for arguments with a default, use `...` instead of the actual default; - avoid using string literals in type annotations, stub files support forward references natively (like Python 3.7 code with `from __future__ import annotations`); - use variable annotations instead of type comments, even for stubs that target older - versions of Python; -- for arguments that default to `None`, use `Optional[]` explicitly; -- use `float` instead of `Union[int, float]`. + versions of Python. ## Pragmatism