X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/df0aeeeee0378f2d2cdc33cbb38e17c3b8b53bde..80de2372e4ec385c082c38f365414ac3622a4010:/docs/the_black_code_style/current_style.md?ds=sidebyside diff --git a/docs/the_black_code_style/current_style.md b/docs/the_black_code_style/current_style.md index 0bf5894..56b9252 100644 --- a/docs/the_black_code_style/current_style.md +++ b/docs/the_black_code_style/current_style.md @@ -8,9 +8,10 @@ deliberately limited and rarely added. Previous formatting is taken into account 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 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_ 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. @@ -84,6 +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. @@ -126,19 +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 @@ -399,16 +400,16 @@ 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. + +### Line endings + +_Black_ will normalize line endings (`\n` or `\r\n`) based on the first line ending of +the file. ## Pragmatism @@ -456,15 +457,15 @@ the latter are treated as true raw strings with no special semantics. ### AST before and after formatting -When run with `--safe`, _Black_ checks that the code before and after is semantically -equivalent. This check is done by comparing the AST of the source with the AST of the -target. There are three limited cases in which the AST does differ: +When run with `--safe` (the default), _Black_ checks that the code before and after is +semantically equivalent. This check is done by comparing the AST of the source with the +AST of the target. There are three limited cases in which the AST does differ: 1. _Black_ cleans up leading and trailing whitespace of docstrings, re-indenting them if needed. It's been one of the most popular user-reported features for the formatter to fix whitespace issues with docstrings. While the result is technically an AST - difference, due to the various possibilities of forming docstrings, all realtime use - of docstrings that we're aware of sanitizes indentation and leading/trailing + difference, due to the various possibilities of forming docstrings, all real-world + uses of docstrings that we're aware of sanitize indentation and leading/trailing whitespace anyway. 1. _Black_ manages optional parentheses for some statements. In the case of the `del`