X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/06e95b1e9bcd43c4574840f8174ba4b2c5d281bd..2116eca51f1108ebc924185c87bc363d8e0329b3:/README.md?ds=inline diff --git a/README.md b/README.md index 9685172..ed9f105 100644 --- a/README.md +++ b/README.md @@ -1,674 +1,535 @@ -![Black Logo](https://raw.githubusercontent.com/ambv/black/master/docs/_static/logo2-readme.png) +![Black Logo](https://raw.githubusercontent.com/psf/black/master/docs/_static/logo2-readme.png) + <h2 align="center">The Uncompromising Code Formatter</h2> <p align="center"> -<a href="https://travis-ci.org/ambv/black"><img alt="Build Status" src="https://travis-ci.org/ambv/black.svg?branch=master"></a> -<a href="http://black.readthedocs.io/en/latest/?badge=latest"><img alt="Documentation Status" src="http://readthedocs.org/projects/black/badge/?version=latest"></a> -<a href="https://coveralls.io/github/ambv/black?branch=master"><img alt="Coverage Status" src="https://coveralls.io/repos/github/ambv/black/badge.svg?branch=master"></a> -<a href="https://github.com/ambv/black/blob/master/LICENSE"><img alt="License: MIT" src="http://black.readthedocs.io/en/latest/_static/license.svg"></a> -<a href="https://pypi.python.org/pypi/black"><img alt="PyPI" src="http://black.readthedocs.io/en/latest/_static/pypi.svg"></a> -<a href="https://github.com/ambv/black"><img alt="Code style: black" src="https://img.shields.io/badge/code%20style-black-000000.svg"></a> +<a href="https://travis-ci.com/psf/black"><img alt="Build Status" src="https://travis-ci.com/psf/black.svg?branch=master"></a> +<a href="https://github.com/psf/black/actions"><img alt="Actions Status" src="https://github.com/psf/black/workflows/Test/badge.svg"></a> +<a href="https://github.com/psf/black/actions"><img alt="Actions Status" src="https://github.com/psf/black/workflows/Primer/badge.svg"></a> +<a href="https://black.readthedocs.io/en/stable/?badge=stable"><img alt="Documentation Status" src="https://readthedocs.org/projects/black/badge/?version=stable"></a> +<a href="https://coveralls.io/github/psf/black?branch=master"><img alt="Coverage Status" src="https://coveralls.io/repos/github/psf/black/badge.svg?branch=master"></a> +<a href="https://github.com/psf/black/blob/master/LICENSE"><img alt="License: MIT" src="https://black.readthedocs.io/en/stable/_static/license.svg"></a> +<a href="https://pypi.org/project/black/"><img alt="PyPI" src="https://img.shields.io/pypi/v/black"></a> +<a href="https://pepy.tech/project/black"><img alt="Downloads" src="https://pepy.tech/badge/black"></a> +<a href="https://anaconda.org/conda-forge/black/"><img alt="conda-forge" src="https://img.shields.io/conda/dn/conda-forge/black.svg?label=conda-forge"></a> +<a href="https://github.com/psf/black"><img alt="Code style: black" src="https://img.shields.io/badge/code%20style-black-000000.svg"></a> </p> > âAny color you like.â +_Black_ is the uncompromising Python code formatter. By using it, you agree to cede +control over minutiae of hand-formatting. In return, _Black_ gives you speed, +determinism, and freedom from `pycodestyle` nagging about formatting. You will save time +and mental energy for more important matters. + +Blackened code looks the same regardless of the project you're reading. Formatting +becomes transparent after a while and you can focus on the content instead. -*Black* is the uncompromising Python code formatter. By using it, you -agree to cease control over minutiae of hand-formatting. In return, -*Black* gives you speed, determinism, and freedom from `pycodestyle` -nagging about formatting. You will save time and mental energy for -more important matters. +_Black_ makes code review faster by producing the smallest diffs possible. -Blackened code looks the same regardless of the project you're reading. -Formatting becomes transparent after a while and you can focus on the -content instead. +Try it out now using the [Black Playground](https://black.now.sh). Watch the +[PyCon 2019 talk](https://youtu.be/esZLCuWs_2Y) to learn more. -*Black* makes code review faster by producing the smallest diffs -possible. +--- +_Contents:_ **[Installation and usage](#installation-and-usage)** | +**[Code style](#the-black-code-style)** | **[Pragmatism](#pragmatism)** | +**[pyproject.toml](#pyprojecttoml)** | **[Editor integration](#editor-integration)** | +**[blackd](#blackd)** | **[black-primer](#black-primer)** | +**[Version control integration](#version-control-integration)** | +**[GitHub Actions](#github-actions)** | +**[Ignoring unmodified files](#ignoring-unmodified-files)** | **[Used by](#used-by)** | +**[Testimonials](#testimonials)** | **[Show your style](#show-your-style)** | +**[Contributing](#contributing-to-black)** | **[Change log](#change-log)** | +**[Authors](#authors)** -## Installation and Usage +--- + +## Installation and usage ### Installation -*Black* can be installed by running `pip install black`. It requires -Python 3.6.0+ to run but you can reformat Python 2 code with it, too. +_Black_ can be installed by running `pip install black`. It requires Python 3.6.2+ to +run. If you want to format Python 2 code as well, install with +`pip install black[python2]`. + +#### Install from GitHub +If you can't wait for the latest _hotness_ and want to install from GitHub, use: + +`pip install git+git://github.com/psf/black` ### Usage To get started right away with sensible defaults: -``` +```sh black {source_file_or_directory} ``` -### Command line options - -Black doesn't provide many options. You can list them by running -`black --help`: - -```text -black [OPTIONS] [SRC]... +You can run _Black_ as a package if running it as a script doesn't work: -Options: - -l, --line-length INTEGER Where to wrap around. [default: 88] - --check Don't write the files back, just return the - status. Return code 0 means nothing would - change. Return code 1 means some files would be - reformatted. Return code 123 means there was an - internal error. - --diff Don't write the files back, just output a diff - for each file on stdout. - --fast / --safe If --fast given, skip temporary sanity checks. - [default: --safe] - -q, --quiet Don't emit non-error messages to stderr. Errors - are still emitted, silence those with - 2>/dev/null. - --version Show the version and exit. - --help Show this message and exit. +```sh +python -m black {source_file_or_directory} ``` -*Black* is a well-behaved Unix-style command-line tool: -* it does nothing if no sources are passed to it; -* it will read from standard input and write to standard output if `-` - is used as the filename; -* it only outputs messages to users on standard error; -* exits with code 0 unless an internal error occured (or `--check` was - used). - +### Command line options -### NOTE: This is an early pre-release +_Black_ doesn't provide many options. You can list them by running `black --help`: -*Black* can already successfully format itself and the standard library. -It also sports a decent test suite. However, it is still very new. -Things will probably be wonky for a while. This is made explicit by the -"Alpha" trove classifier, as well as by the "a" in the version number. -What this means for you is that **until the formatter becomes stable, -you should expect some formatting to change in the future**. +```text +Usage: black [OPTIONS] [SRC]... -Also, as a temporary safety measure, *Black* will check that the -reformatted code still produces a valid AST that is equivalent to the -original. This slows it down. If you're feeling confident, use -``--fast``. + The uncompromising code formatter. +Options: + -c, --code TEXT Format the code passed in as a string. + -l, --line-length INTEGER How many characters per line to allow. + [default: 88] + + -t, --target-version [py27|py33|py34|py35|py36|py37|py38|py39] + Python versions that should be supported by + Black's output. [default: per-file auto- + detection] + + --pyi Format all input files like typing stubs + regardless of file extension (useful when + piping source on standard input). + + -S, --skip-string-normalization + Don't normalize string quotes or prefixes. + -C, --skip-magic-trailing-comma + Don't use trailing commas as a reason to + split lines. + + --check Don't write the files back, just return the + status. Return code 0 means nothing would + change. Return code 1 means some files + would be reformatted. Return code 123 means + there was an internal error. + + --diff Don't write the files back, just output a + diff for each file on stdout. + + --color / --no-color Show colored diff. Only applies when + `--diff` is given. + + --fast / --safe If --fast given, skip temporary sanity + checks. [default: --safe] + + --include TEXT A regular expression that matches files and + directories that should be included on + recursive searches. An empty value means + all files are included regardless of the + name. Use forward slashes for directories + on all platforms (Windows, too). Exclusions + are calculated first, inclusions later. + [default: \.pyi?$] + + --exclude TEXT A regular expression that matches files and + directories that should be excluded on + recursive searches. An empty value means no + paths are excluded. Use forward slashes for + directories on all platforms (Windows, too). + Exclusions are calculated first, inclusions + later. [default: /(\.direnv|\.eggs|\.git|\. + hg|\.mypy_cache|\.nox|\.tox|\.venv|venv|\.sv + n|_build|buck-out|build|dist)/] + + --extend-exclude TEXT Like --exclude, but adds additional files + and directories on top of the excluded + ones (useful if you simply want to add to + the default). + + --force-exclude TEXT Like --exclude, but files and directories + matching this regex will be excluded even + when they are passed explicitly as + arguments. + + + --stdin-filename TEXT The name of the file when passing it through + stdin. Useful to make sure Black will + respect --force-exclude option on some + editors that rely on using stdin. + + -q, --quiet Don't emit non-error messages to stderr. + Errors are still emitted; silence those with + 2>/dev/null. + + -v, --verbose Also emit messages to stderr about files + that were not changed or were ignored due to + exclusion patterns. + + --version Show the version and exit. + --config FILE Read configuration from FILE path. + -h, --help Show this message and exit. +``` -## The *Black* code style +_Black_ is a well-behaved Unix-style command-line tool: -*Black* reformats entire files in place. It is not configurable. It -doesn't take previous formatting into account. It doesn't reformat -blocks that start with `# fmt: off` and end with `# fmt: on`. It also -recognizes [YAPF](https://github.com/google/yapf)'s block comments to -the same effect, as a courtesy for straddling code. +- it does nothing if no sources are passed to it; +- it will read from standard input and write to standard output if `-` is used as the + filename; +- it only outputs messages to users on standard error; +- exits with code 0 unless an internal error occurred (or `--check` was used). +### Using _Black_ with other tools -### How *Black* wraps lines +While _Black_ enforces formatting that conforms to PEP 8, other tools may raise warnings +about _Black_'s changes or will overwrite _Black_'s changes. A good example of this is +[isort](https://pypi.org/p/isort). Since _Black_ is barely configurable, these tools +should be configured to neither warn about nor overwrite _Black_'s changes. -*Black* ignores previous formatting and applies uniform horizontal -and vertical whitespace to your code. The rules for horizontal -whitespace are pretty obvious and 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. +Actual details on _Black_ compatible configurations for various tools can be found in +[compatible_configs](https://github.com/psf/black/blob/master/docs/compatible_configs.md#black-compatible-configurations). -As for vertical whitespace, *Black* tries to render one full expression -or simple statement per line. If this fits the allotted line length, -great. -```py3 -# in: +### Migrating your code style without ruining git blame -l = [1, - 2, - 3, -] +A long-standing argument against moving to automated code formatters like _Black_ is +that the migration will clutter up the output of `git blame`. This was a valid argument, +but since Git version 2.23, Git natively supports +[ignoring revisions in blame](https://git-scm.com/docs/git-blame#Documentation/git-blame.txt---ignore-revltrevgt) +with the `--ignore-rev` option. You can also pass a file listing the revisions to ignore +using the `--ignore-revs-file` option. The changes made by the revision will be ignored +when assigning blame. Lines modified by an ignored revision will be blamed on the +previous revision that modified those lines. -# out: +So when migrating your project's code style to _Black_, reformat everything and commit +the changes (preferably in one massive commit). Then put the full 40 characters commit +identifier(s) into a file. -l = [1, 2, 3] +``` +# Migrate code style to Black +5b4ab991dede475d393e9d69ec388fd6bd949699 ``` -If not, *Black* will look at the contents of the first outer matching -brackets and put that in a separate indented line. -```py3 -# in: +Afterwards, you can pass that file to `git blame` and see clean and meaningful blame +information. -l = [[n for n in list_bosses()], [n for n in list_employees()]] +```console +$ git blame important.py --ignore-revs-file .git-blame-ignore-revs +7a1ae265 (John Smith 2019-04-15 15:55:13 -0400 1) def very_important_function(text, file): +abdfd8b0 (Alice Doe 2019-09-23 11:39:32 -0400 2) text = text.lstrip() +7a1ae265 (John Smith 2019-04-15 15:55:13 -0400 3) with open(file, "r+") as f: +7a1ae265 (John Smith 2019-04-15 15:55:13 -0400 4) f.write(formatted) +``` -# out: +You can even configure `git` to automatically ignore revisions listed in a file on every +call to `git blame`. -l = [ - [n for n in list_bosses()], [n for n in list_employees()] -] +```console +$ git config blame.ignoreRevsFile .git-blame-ignore-revs ``` -If that still doesn't fit the bill, it will decompose the internal -expression further using the same rule, indenting matching brackets -every time. If the contents of the matching brackets pair are -comma-separated (like an argument list, or a dict literal, and so on) -then *Black* will first try to keep them on the same line with the -matching brackets. If that doesn't work, it will put all of them in -separate lines. -```py3 -# in: - -def very_important_function(template: str, *variables, file: os.PathLike, debug: bool = False): - """Applies `variables` to the `template` and writes to `file`.""" - with open(file, 'w') as f: - ... - -# out: - -def very_important_function( - template: str, - *variables, - file: os.PathLike, - debug: bool = False, -): - """Applies `variables` to the `template` and writes to `file`.""" - with open(file, "w") as f: - ... -``` +**The one caveat is that GitHub and GitLab do not yet support ignoring revisions using +their native UI of blame.** So blame information will be cluttered with a reformatting +commit on those platforms. (If you'd like this feature, there's an open issue for +[GitLab](https://gitlab.com/gitlab-org/gitlab/-/issues/31423) and please let GitHub +know!) -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). - - -### Line length - -You probably noticed the peculiar default line length. *Black* defaults -to 88 characters per line, which happens to be 10% over 80. This number -was found to produce significantly shorter files than sticking with 80 -(the most popular), or even 79 (used by the standard library). In -general, [90-ish seems like the wise choice](https://youtu.be/wf-BqAjZb8M?t=260). - -If you're paid by the line of code you write, you can pass -`--line-length` with a lower number. *Black* will try to respect that. -However, sometimes it won't be able to without breaking other rules. In -those rare cases, auto-formatted code will exceed your allotted limit. - -You can also increase it, but remember that people with sight disabilities -find it harder to work with line lengths exceeding 100 characters. -It also adversely affects side-by-side diff review on typical screen -resolutions. Long lines also make it harder to present code neatly -in documentation or talk slides. - -If you're using Flake8, you can bump `max-line-length` to 88 and forget -about it. Alternatively, use [Bugbear](https://github.com/PyCQA/flake8-bugbear)'s -B950 warning instead of E501 and keep the max line length at 80 which -you are probably already using. You'd do it like this: -```ini -[flake8] -max-line-length = 80 -... -select = C,E,F,W,B,B950 -ignore = E501 -``` +### NOTE: This is a beta product -You'll find *Black*'s own .flake8 config file is configured like this. -If you're curious about the reasoning behind B950, Bugbear's documentation -explains it. The tl;dr is "it's like highway speed limits, we won't -bother you if you overdo it by a few km/h". - - -### Empty lines - -*Black* avoids spurious vertical whitespace. This is in the spirit of -PEP 8 which says that in-function vertical whitespace should only be -used sparingly. One exception is control flow statements: *Black* will -always emit an extra empty line after ``return``, ``raise``, ``break``, -``continue``, and ``yield``. This is to make changes in control flow -more prominent to readers of your code. - -*Black* will allow single empty lines inside functions, and single and -double empty lines on module level left by the original editors, except -when they're within parenthesized expressions. Since such expressions -are always reformatted to fit minimal space, this whitespace is lost. - -It will also insert proper spacing before and after function definitions. -It's one line before and after inner functions and two lines before and -after module-level functions. *Black* will put those empty lines also -between the function definition and any standalone comments that -immediately precede the given function. If you want to comment on the -entire function, use a docstring or put a leading comment in the function -body. - - -### Trailing commas - -*Black* will add trailing commas to expressions that are split -by comma where each element is on its own line. This includes function -signatures. - -Unnecessary trailing commas are removed if an expression fits in one -line. This makes it 1% more likely that your line won't exceed the -allotted line length limit. Moreover, in this scenario, if you added -another argument to your call, you'd probably fit it in the same line -anyway. That doesn't make diffs any larger. - -One exception to removing trailing commas is tuple expressions with -just one element. In this case *Black* won't touch the single trailing -comma as this would unexpectedly change the underlying data type. Note -that this is also the case when commas are used while indexing. This is -a tuple in disguise: ```numpy_array[3, ]```. - -One exception to adding trailing commas is function signatures -containing `*`, `*args`, or `**kwargs`. In this case a trailing comma -is only safe to use on Python 3.6. *Black* will detect if your file is -already 3.6+ only and use trailing commas in this situation. If you -wonder how it knows, it looks for f-strings and existing use of trailing -commas in function signatures that have stars in them. In other words, -if you'd like a trailing comma in this situation and *Black* didn't -recognize it was safe to do so, put it there manually and *Black* will -keep it. - -### Strings - -*Black* prefers double quotes (`"` and `"""`) over single quotes (`'` -and `'''`). It will replace the latter with the former as long as it -does not result in more backslash escapes than before. - -The main reason to standardize on a single form of quotes is aesthetics. -Having one kind of quotes everywhere reduces reader distraction. -It will also enable a future version of *Black* to merge consecutive -string literals that ended up on the same line (see -[#26](https://github.com/ambv/black/issues/26) for details). - -Why settle on double quotes? They anticipate apostrophes in English -text. They match the docstring standard described in PEP 257. An -empty string in double quotes (`""`) is impossible to confuse with -a one double-quote regardless of fonts and syntax highlighting used. -On top of this, double quotes for strings are consistent with C which -Python interacts a lot with. - -On certain keyboard layouts like US English, typing single quotes is -a bit easier than double quotes. The latter requires use of the Shift -key. My recommendation here is to keep using whatever is faster to type -and let *Black* handle the transformation. - -### Line Breaks & Binary Operators - -*Black* will break a line before a binary operator when splitting a block -of code over multiple lines. This is so that *Black* is compliant with the -recent changes in the [PEP 8](https://www.python.org/dev/peps/pep-0008/#should-a-line-break-before-or-after-a-binary-operator) -style guide, which emphasizes that this approach improves readability. - -This behaviour may raise ``W503 line break before binary operator`` warnings in -style guide enforcement tools like Flake8. Since ``W503`` is not PEP 8 compliant, -you should tell Flake8 to ignore these warnings. - -### Parentheses - -Some parentheses are optional in the Python grammar. Any expression can -be wrapped in a pair of parentheses to form an atom. There are a few -interesting cases: - -- `if (...):` -- `while (...):` -- `for (...) in (...):` -- `assert (...), (...)` -- `from X import (...)` - -In those cases, parentheses are removed when the entire statement fits -in one line, or if the inner expression doesn't have any delimiters to -further split on. Otherwise, the parentheses are always added. +_Black_ is already [successfully used](https://github.com/psf/black#used-by) by many +projects, small and big. It also sports a decent test suite. However, it is still very +new. Things will probably be wonky for a while. This is made explicit by the "Beta" +trove classifier, as well as by the "b" in the version number. What this means for you +is that **until the formatter becomes stable, you should expect some formatting to +change in the future**. That being said, no drastic stylistic changes are planned, +mostly responses to bug reports. +Also, as a temporary safety measure, _Black_ will check that the reformatted code still +produces a valid AST that is equivalent to the original. This slows it down. If you're +feeling confident, use `--fast`. -## Editor integration +## The _Black_ code style -### Emacs +_Black_ is a PEP 8 compliant opinionated formatter. _Black_ reformats entire files in +place. It is not configurable. It doesn't take previous formatting into account. Your +main option of configuring _Black_ is that it doesn't reformat blocks that start with +`# fmt: off` and end with `# fmt: on`, or lines that ends with `# fmt: skip`. Pay +attention that `# fmt: on/off` have to be on the same level of indentation. To learn +more about _Black_'s opinions, to go +[the_black_code_style](https://github.com/psf/black/blob/master/docs/the_black_code_style.md). -Use [proofit404/blacken](https://github.com/proofit404/blacken). +Please refer to this document before submitting an issue. What seems like a bug might be +intended behaviour. +## Pragmatism -### PyCharm +Early versions of _Black_ used to be absolutist in some respects. They took after its +initial author. This was fine at the time as it made the implementation simpler and +there were not many users anyway. Not many edge cases were reported. As a mature tool, +_Black_ does make some exceptions to rules it otherwise holds. This +[section](https://github.com/psf/black/blob/master/docs/the_black_code_style.md#pragmatism) +of `the_black_code_style` describes what those exceptions are and why this is the case. -1. Install `black`. +Please refer to this document before submitting an issue just like with the document +above. What seems like a bug might be intended behaviour. - $ pip install black +## pyproject.toml -2. Locate your `black` installation folder. +_Black_ is able to read project-specific default values for its command line options +from a `pyproject.toml` file. This is especially useful for specifying custom +`--include` and `--exclude`/`--extend-exclude` patterns for your project. - On MacOS / Linux / BSD: +**Pro-tip**: If you're asking yourself "Do I need to configure anything?" the answer is +"No". _Black_ is all about sensible defaults. - $ which black - /usr/local/bin/black # possible location +### What on Earth is a `pyproject.toml` file? - On Windows: +[PEP 518](https://www.python.org/dev/peps/pep-0518/) defines `pyproject.toml` as a +configuration file to store build system requirements for Python projects. With the help +of tools like [Poetry](https://python-poetry.org/) or +[Flit](https://flit.readthedocs.io/en/latest/) it can fully replace the need for +`setup.py` and `setup.cfg` files. - $ where black - %LocalAppData%\Programs\Python\Python36-32\Scripts\black.exe # possible location +### Where _Black_ looks for the file -3. Open External tools in PyCharm with `File -> Settings -> Tools -> External Tools`. +By default _Black_ looks for `pyproject.toml` starting from the common base directory of +all files and directories passed on the command line. If it's not there, it looks in +parent directories. It stops looking when it finds the file, or a `.git` directory, or a +`.hg` directory, or the root of the file system, whichever comes first. -4. Click the + icon to add a new external tool with the following values: - - Name: Black - - Description: Black is the uncompromising Python code formatter. - - Program: <install_location_from_step_2> - - Arguments: $FilePath$ +If you're formatting standard input, _Black_ will look for configuration starting from +the current working directory. -5. Format the currently opened file by selecting `Tools -> External Tools -> black`. - - Alternatively, you can set a keyboard shortcut by navigating to `Preferences -> Keymap`. +You can use a "global" configuration, stored in a specific location in your home +directory. This will be used as a fallback configuration, that is, it will be used if +and only if _Black_ doesn't find any configuration as mentioned above. Depending on your +operating system, this configuration file should be stored as: +- Windows: `~\.black` +- Unix-like (Linux, MacOS, etc.): `$XDG_CONFIG_HOME/black` (`~/.config/black` if the + `XDG_CONFIG_HOME` environment variable is not set) -### Vim +Note that these are paths to the TOML file itself (meaning that they shouldn't be named +as `pyproject.toml`), not directories where you store the configuration. Here, `~` +refers to the path to your home directory. On Windows, this will be something like +`C:\\Users\UserName`. -Commands and shortcuts: +You can also explicitly specify the path to a particular file that you want with +`--config`. In this situation _Black_ will not look for any other file. -* `,=` or `:Black` to format the entire file (ranges not supported); -* `:BlackUpgrade` to upgrade *Black* inside the virtualenv; -* `:BlackVersion` to get the current version of *Black* inside the - virtualenv. +If you're running with `--verbose`, you will see a blue message if a file was found and +used. -Configuration: -* `g:black_fast` (defaults to `0`) -* `g:black_linelength` (defaults to `88`) -* `g:black_virtualenv` (defaults to `~/.vim/black`) +Please note `blackd` will not use `pyproject.toml` configuration. -To install, copy the plugin from [vim/plugin/black.vim](https://github.com/ambv/black/tree/master/vim/plugin/black.vim). -Let me know if this requires any changes to work with Vim 8's builtin -`packadd`, or Pathogen, or Vundle, and so on. +### Configuration format -This plugin **requires Vim 7.0+ built with Python 3.6+ support**. It -needs Python 3.6 to be able to run *Black* inside the Vim process which -is much faster than calling an external command. +As the file extension suggests, `pyproject.toml` is a +[TOML](https://github.com/toml-lang/toml) file. It contains separate sections for +different tools. _Black_ is using the `[tool.black]` section. The option keys are the +same as long names of options on the command line. + +Note that you have to use single-quoted strings in TOML for regular expressions. It's +the equivalent of r-strings in Python. Multiline strings are treated as verbose regular +expressions by Black. Use `[ ]` to denote a significant space character. -On first run, the plugin creates its own virtualenv using the right -Python version and automatically installs *Black*. You can upgrade it later -by calling `:BlackUpgrade` and restarting Vim. +<details> +<summary>Example <code>pyproject.toml</code></summary> -If you need to do anything special to make your virtualenv work and -install *Black* (for example you want to run a version from master), just -create a virtualenv manually and point `g:black_virtualenv` to it. -The plugin will use it. +```toml +[tool.black] +line-length = 88 +target-version = ['py37'] +include = '\.pyi?$' +extend-exclude = ''' +# A regex preceded with ^/ will apply only to files and directories +# in the root of the project. +^/foo.py # exclude a file named foo.py in the root of the project (in addition to the defaults) +''' +``` -**How to get Vim with Python 3.6?** -On Ubuntu 17.10 Vim comes with Python 3.6 by default. -On macOS with HomeBrew run: `brew install vim --with-python3`. -When building Vim from source, use: -`./configure --enable-python3interp=yes`. There's many guides online how -to do this. +</details> +### Lookup hierarchy -### Visual Studio Code +Command-line options have defaults that you can see in `--help`. A `pyproject.toml` can +override those defaults. Finally, options provided by the user on the command line +override both. -Use [joslarson.black-vscode](https://marketplace.visualstudio.com/items?itemName=joslarson.black-vscode). +_Black_ will only ever use one `pyproject.toml` file during an entire run. It doesn't +look for multiple files, and doesn't compose configuration from different levels of the +file hierarchy. -### SublimeText 3 +## Editor integration -Use [sublack plugin](https://github.com/jgirardet/sublack). +_Black_ can be integrated into many editors with plugins. They let you run _Black_ on +your code with the ease of doing it in your editor. To get started using _Black_ in your +editor of choice, please see +[editor_integration](https://github.com/psf/black/blob/master/docs/editor_integration.md). -### Other editors +Patches are welcome for editors without an editor integration or plugin! More +information can be found in +[editor_integration](https://github.com/psf/black/blob/master/docs/editor_integration.md#other-editors). -Atom/Nuclide integration is planned by the author, others will -require external contributions. +## blackd -Patches welcome! ⨠ð° ⨠+`blackd` is a small HTTP server that exposes Black's functionality over a simple +protocol. The main benefit of using it is to avoid paying the cost of starting up a new +Black process every time you want to blacken a file. Please refer to +[blackd](https://github.com/psf/black/blob/master/docs/blackd.md) to get the ball +rolling. -Any tool that can pipe code through *Black* using its stdio mode (just -[use `-` as the file name](http://www.tldp.org/LDP/abs/html/special-chars.html#DASHREF2)). -The formatted code will be returned on stdout (unless `--check` was -passed). *Black* will still emit messages on stderr but that shouldn't -affect your use case. +## black-primer -This can be used for example with PyCharm's [File Watchers](https://www.jetbrains.com/help/pycharm/file-watchers.html). +`black-primer` is a tool built for CI (and humans) to have _Black_ `--check` a number of +(configured in `primer.json`) Git accessible projects in parallel. +[black_primer](https://github.com/psf/black/blob/master/docs/black_primer.md) has more +information regarding its usage and configuration. +(A PR adding Mercurial support will be accepted.) ## Version control integration -Use [pre-commit](https://pre-commit.com/). Once you [have it -installed](https://pre-commit.com/#install), add this to the +Use [pre-commit](https://pre-commit.com/). Once you +[have it installed](https://pre-commit.com/#install), add this to the `.pre-commit-config.yaml` in your repository: + ```yaml repos: -- repo: https://github.com/ambv/black - rev: stable + - repo: https://github.com/psf/black + rev: 20.8b1 # Replace by any tag/version: https://github.com/psf/black/tags hooks: - - id: black - args: [--line-length=88, --safe] - python_version: python3.6 + - id: black + language_version: python3 # Should be a command that runs python3.6+ ``` -Then run `pre-commit install` and you're ready to go. - -`args` in the above config is optional but shows you how you can change -the line length if you really need to. If you're already using Python -3.7, switch the `python_version` accordingly. Finally, `stable` is a tag -that is pinned to the latest release on PyPI. If you'd rather run on -master, this is also an option. - -## Ignoring non-modified files - -*Black* remembers files it already formatted, unless the `--diff` flag is used or -code is passed via standard input. This information is stored per-user. The exact -location of the file depends on the black version and the system on which black -is run. The file is non-portable. The standard location on common operating systems -is: - -* Windows: `C:\\Users\<username>\AppData\Local\black\black\Cache\<version>\cache.pickle` -* macOS: `/Users/<username>/Library/Caches/black/<version>/cache.pickle` -* Linux: `/home/<username>/.cache/black/<version>/cache.pickle` - - -## Testimonials - -**Dusty Phillips**, [writer](https://smile.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=dusty+phillips): - -> Black is opinionated so you don't have to be. - -**Hynek Schlawack**, [creator of `attrs`](http://www.attrs.org/), core -developer of Twisted and CPython: - -> An auto-formatter that doesn't suck is all I want for Xmas! - -**Carl Meyer**, [Django](https://www.djangoproject.com/) core developer: - -> At least the name is good. - -**Kenneth Reitz**, creator of [`requests`](http://python-requests.org/) -and [`pipenv`](https://docs.pipenv.org/): +Then run `pre-commit install` and you're ready to go. -> This vastly improves the formatting of our code. Thanks a ton! +Avoid using `args` in the hook. Instead, store necessary configuration in +`pyproject.toml` so that editors and command-line usage of Black all behave consistently +for your project. See _Black_'s own +[pyproject.toml](https://github.com/psf/black/blob/master/pyproject.toml) for an +example. +If you're already using Python 3.7, switch the `language_version` accordingly. Finally, +`stable` is a branch that tracks the latest release on PyPI. If you'd rather run on +master, this is also an option. -## Show your style +## GitHub Actions -Use the badge in your project's README.md: +Create a file named `.github/workflows/black.yml` inside your repository with: -```markdown -[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black) +```yaml +name: Lint + +on: [push, pull_request] + +jobs: + lint: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - uses: actions/setup-python@v2 + - uses: psf/black@stable + with: + args: ". --check" ``` -Looks like this: [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black) - - -## License - -MIT - +### Inputs -## Contributing to Black +#### `black_args` -In terms of inspiration, *Black* is about as configurable as *gofmt* and -*rustfmt* are. This is deliberate. +**optional**: Black input arguments. Defaults to `. --check --diff`. -Bug reports and fixes are always welcome! However, before you suggest a -new feature or configuration knob, ask yourself why you want it. If it -enables better integration with some workflow, fixes an inconsistency, -speeds things up, and so on - go for it! On the other hand, if your -answer is "because I don't like a particular formatting" then you're not -ready to embrace *Black* yet. Such changes are unlikely to get accepted. -You can still try but prepare to be disappointed. +## Ignoring unmodified files -More details can be found in [CONTRIBUTING](CONTRIBUTING.md). - - -## Change Log - -### 18.4a3 (unreleased) - -* added a "cache"; files already reformatted that haven't changed on disk - won't be reformatted again (#109) - -* `--check` and `--diff` are no longer mutually exclusive (#149) - -* generalized star expression handling, including double stars; this - fixes multiplication making expressions "unsafe" for trailing commas (#132) - -* fixed `--diff` not showing entire path (#130) - -* fixed parsing of complex expressions after star and double stars in - function parameters (#2) - -* fixed invalid splitting on comma in lambda arguments (#133) - -### 18.4a2 - -* fixed parsing of unaligned standalone comments (#99, #112) - -* fixed placement of dictionary unpacking inside dictionary literals (#111) - -* Vim plugin now works on Windows, too - -* fixed unstable formatting when encountering unnecessarily escaped quotes - in a string (#120) - - -### 18.4a1 - -* added `--quiet` (#78) - -* added automatic parentheses management (#4) - -* added [pre-commit](https://pre-commit.com) integration (#103, #104) - -* fixed reporting on `--check` with multiple files (#101, #102) - -* fixed removing backslash escapes from raw strings (#100, #105) - - -### 18.4a0 - -* added `--diff` (#87) - -* add line breaks before all delimiters, except in cases like commas, to - better comply with PEP 8 (#73) - -* standardize string literals to use double quotes (almost) everywhere - (#75) - -* fixed handling of standalone comments within nested bracketed - expressions; Black will no longer produce super long lines or put all - standalone comments at the end of the expression (#22) - -* fixed 18.3a4 regression: don't crash and burn on empty lines with - trailing whitespace (#80) - -* fixed 18.3a4 regression: `# yapf: disable` usage as trailing comment - would cause Black to not emit the rest of the file (#95) - -* when CTRL+C is pressed while formatting many files, Black no longer - freaks out with a flurry of asyncio-related exceptions - -* only allow up to two empty lines on module level and only single empty - lines within functions (#74) - - -### 18.3a4 - -* `# fmt: off` and `# fmt: on` are implemented (#5) - -* automatic detection of deprecated Python 2 forms of print statements - and exec statements in the formatted file (#49) - -* use proper spaces for complex expressions in default values of typed - function arguments (#60) - -* only return exit code 1 when --check is used (#50) - -* don't remove single trailing commas from square bracket indexing - (#59) - -* don't omit whitespace if the previous factor leaf wasn't a math - operator (#55) - -* omit extra space in kwarg unpacking if it's the first argument (#46) - -* omit extra space in [Sphinx auto-attribute comments](http://www.sphinx-doc.org/en/stable/ext/autodoc.html#directive-autoattribute) - (#68) +_Black_ remembers files it has already formatted, unless the `--diff` flag is used or +code is passed via standard input. This information is stored per-user. The exact +location of the file depends on the _Black_ version and the system on which _Black_ is +run. The file is non-portable. The standard location on common operating systems is: +- Windows: + `C:\\Users\<username>\AppData\Local\black\black\Cache\<version>\cache.<line-length>.<file-mode>.pickle` +- macOS: + `/Users/<username>/Library/Caches/black/<version>/cache.<line-length>.<file-mode>.pickle` +- Linux: + `/home/<username>/.cache/black/<version>/cache.<line-length>.<file-mode>.pickle` -### 18.3a3 +`file-mode` is an int flag that determines whether the file was formatted as 3.6+ only, +as .pyi, and whether string normalization was omitted. -* don't remove single empty lines outside of bracketed expressions - (#19) +To override the location of these files on macOS or Linux, set the environment variable +`XDG_CACHE_HOME` to your preferred location. For example, if you want to put the cache +in the directory you're running _Black_ from, set `XDG_CACHE_HOME=.cache`. _Black_ will +then write the above files to `.cache/black/<version>/`. -* added ability to pipe formatting from stdin to stdin (#25) +## Used by -* restored ability to format code with legacy usage of `async` as - a name (#20, #42) +The following notable open-source projects trust _Black_ with enforcing a consistent +code style: pytest, tox, Pyramid, Django Channels, Hypothesis, attrs, SQLAlchemy, +Poetry, PyPA applications (Warehouse, Bandersnatch, Pipenv, virtualenv), pandas, Pillow, +every Datadog Agent Integration, Home Assistant, Zulip. -* even better handling of numpy-style array indexing (#33, again) +The following organizations use _Black_: Facebook, Dropbox, Mozilla, Quora. +Are we missing anyone? Let us know. -### 18.3a2 +## Testimonials -* changed positioning of binary operators to occur at beginning of lines - instead of at the end, following [a recent change to PEP8](https://github.com/python/peps/commit/c59c4376ad233a62ca4b3a6060c81368bd21e85b) - (#21) +**Dusty Phillips**, +[writer](https://smile.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=dusty+phillips): -* ignore empty bracket pairs while splitting. This avoids very weirdly - looking formattings (#34, #35) +> _Black_ is opinionated so you don't have to be. -* remove a trailing comma if there is a single argument to a call +**Hynek Schlawack**, [creator of `attrs`](https://www.attrs.org/), core developer of +Twisted and CPython: -* if top level functions were separated by a comment, don't put four - empty lines after the upper function +> An auto-formatter that doesn't suck is all I want for Xmas! -* fixed unstable formatting of newlines with imports +**Carl Meyer**, [Django](https://www.djangoproject.com/) core developer: -* fixed unintentional folding of post scriptum standalone comments - into last statement if it was a simple statement (#18, #28) +> At least the name is good. -* fixed missing space in numpy-style array indexing (#33) +**Kenneth Reitz**, creator of [`requests`](http://python-requests.org/) and +[`pipenv`](https://readthedocs.org/projects/pipenv/): -* fixed spurious space after star-based unary expressions (#31) +> This vastly improves the formatting of our code. Thanks a ton! +## Show your style -### 18.3a1 +Use the badge in your project's README.md: -* added `--check` +```md +[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) +``` -* only put trailing commas in function signatures and calls if it's - safe to do so. If the file is Python 3.6+ it's always safe, otherwise - only safe if there are no `*args` or `**kwargs` used in the signature - or call. (#8) +Using the badge in README.rst: -* fixed invalid spacing of dots in relative imports (#6, #13) +``` +.. image:: https://img.shields.io/badge/code%20style-black-000000.svg + :target: https://github.com/psf/black +``` -* fixed invalid splitting after comma on unpacked variables in for-loops - (#23) +Looks like this: +[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) -* fixed spurious space in parenthesized set expressions (#7) +## License -* fixed spurious space after opening parentheses and in default - arguments (#14, #17) +MIT -* fixed spurious space after unary operators when the operand was - a complex expression (#15) +## Contributing to _Black_ +In terms of inspiration, _Black_ is about as configurable as _gofmt_. This is +deliberate. -### 18.3a0 +Bug reports and fixes are always welcome! However, before you suggest a new feature or +configuration knob, ask yourself why you want it. If it enables better integration with +some workflow, fixes an inconsistency, speeds things up, and so on - go for it! On the +other hand, if your answer is "because I don't like a particular formatting" then you're +not ready to embrace _Black_ yet. Such changes are unlikely to get accepted. You can +still try but prepare to be disappointed. -* first published version, Happy ð° Day 2018! +More details can be found in +[CONTRIBUTING](https://github.com/psf/black/blob/master/CONTRIBUTING.md). -* alpha quality +## Change log -* date-versioned (see: https://calver.org/) +The log's become rather long. It moved to its own file. +See [CHANGES](https://github.com/psf/black/blob/master/CHANGES.md). ## Authors @@ -676,16 +537,182 @@ Glued together by [Åukasz Langa](mailto:lukasz@langa.pl). Maintained with [Carol Willing](mailto:carolcode@willingconsulting.com), [Carl Meyer](mailto:carl@oddbird.net), -[Mika Naylor](mailto:mail@autophagy.io), and -[Zsolt Dollenstein](mailto:zsol.zsol@gmail.com). +[Jelle Zijlstra](mailto:jelle.zijlstra@gmail.com), +[Mika Naylor](mailto:mail@autophagy.io), +[Zsolt Dollenstein](mailto:zsol.zsol@gmail.com), and +[Cooper Lees](mailto:me@cooperlees.com). Multiple contributions by: -* [Anthony Sottile](mailto:asottile@umich.edu) -* [Artem Malyshev](mailto:proofit404@gmail.com) -* [Daniel M. Capella](mailto:polycitizen@gmail.com) -* [Eli Treuherz](mailto:eli.treuherz@cgi.com) -* Hugo van Kemenade -* [Ivan KataniÄ](mailto:ivan.katanic@gmail.com) -* [Jonas Obrist](mailto:ojiidotch@gmail.com) -* [Osaetin Daniel](mailto:osaetindaniel@gmail.com) -* [Vishwas B Sharma](mailto:sharma.vishwas88@gmail.com) + +- [Abdur-Rahmaan Janhangeer](mailto:arj.python@gmail.com) +- [Adam Johnson](mailto:me@adamj.eu) +- [Adam Williamson](mailto:adamw@happyassassin.net) +- [Alexander Huynh](mailto:github@grande.coffee) +- [Alex Vandiver](mailto:github@chmrr.net) +- [Allan Simon](mailto:allan.simon@supinfo.com) +- Anders-Petter Ljungquist +- [Andrew Thorp](mailto:andrew.thorp.dev@gmail.com) +- [Andrew Zhou](mailto:andrewfzhou@gmail.com) +- [Andrey](mailto:dyuuus@yandex.ru) +- [Andy Freeland](mailto:andy@andyfreeland.net) +- [Anthony Sottile](mailto:asottile@umich.edu) +- [Arjaan Buijk](mailto:arjaan.buijk@gmail.com) +- [Arnav Borbornah](mailto:arnavborborah11@gmail.com) +- [Artem Malyshev](mailto:proofit404@gmail.com) +- [Asger Hautop Drewsen](mailto:asgerdrewsen@gmail.com) +- [Augie Fackler](mailto:raf@durin42.com) +- [Aviskar KC](mailto:aviskarkc10@gmail.com) +- Batuhan TaÅkaya +- [Benjamin Wohlwend](mailto:bw@piquadrat.ch) +- [Benjamin Woodruff](mailto:github@benjam.info) +- [Bharat Raghunathan](mailto:bharatraghunthan9767@gmail.com) +- [Brandt Bucher](mailto:brandtbucher@gmail.com) +- [Brett Cannon](mailto:brett@python.org) +- [Bryan Bugyi](mailto:bryan.bugyi@rutgers.edu) +- [Bryan Forbes](mailto:bryan@reigndropsfall.net) +- [Calum Lind](mailto:calumlind@gmail.com) +- [Charles](mailto:peacech@gmail.com) +- Charles Reid +- [Christian Clauss](mailto:cclauss@bluewin.ch) +- [Christian Heimes](mailto:christian@python.org) +- [Chuck Wooters](mailto:chuck.wooters@microsoft.com) +- [Chris Rose](mailto:offline@offby1.net) +- Codey Oxley +- [Cong](mailto:congusbongus@gmail.com) +- [Cooper Ry Lees](mailto:me@cooperlees.com) +- [Dan Davison](mailto:dandavison7@gmail.com) +- [Daniel Hahler](mailto:github@thequod.de) +- [Daniel M. 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Smith](mailto:greg@krypto.org) +- Gustavo Camargo +- hauntsaninja +- [Hadi Alqattan](mailto:alqattanhadizaki@gmail.com) +- [Heaford](mailto:dan@heaford.com) +- [Hugo Barrera](mailto::hugo@barrera.io) +- Hugo van Kemenade +- [Hynek Schlawack](mailto:hs@ox.cx) +- [Ivan KataniÄ](mailto:ivan.katanic@gmail.com) +- [Jakub Kadlubiec](mailto:jakub.kadlubiec@skyscanner.net) +- [Jakub Warczarek](mailto:jakub.warczarek@gmail.com) +- [Jan Hnátek](mailto:jan.hnatek@gmail.com) +- [Jason Fried](mailto:me@jasonfried.info) +- [Jason Friedland](mailto:jason@friedland.id.au) +- [jgirardet](mailto:ijkl@netc.fr) +- Jim Brännlund +- [Jimmy Jia](mailto:tesrin@gmail.com) +- [Joe Antonakakis](mailto:jma353@cornell.edu) +- [Jon Dufresne](mailto:jon.dufresne@gmail.com) +- [Jonas Obrist](mailto:ojiidotch@gmail.com) +- [Jonty Wareing](mailto:jonty@jonty.co.uk) +- [Jose Nazario](mailto:jose.monkey.org@gmail.com) +- [Joseph Larson](mailto:larson.joseph@gmail.com) +- [Josh Bode](mailto:joshbode@fastmail.com) +- [Josh Holland](mailto:anowlcalledjosh@gmail.com) +- [Joshua Cannon](mailto:joshdcannon@gmail.com) +- [José Padilla](mailto:jpadilla@webapplicate.com) +- [Juan Luis Cano RodrÃguez](mailto:hello@juanlu.space) +- [kaiix](mailto:kvn.hou@gmail.com) +- [Katie McLaughlin](mailto:katie@glasnt.com) +- Katrin Leinweber +- [Keith Smiley](mailto:keithbsmiley@gmail.com) +- [Kenyon Ralph](mailto:kenyon@kenyonralph.com) +- [Kevin Kirsche](mailto:Kev.Kirsche+GitHub@gmail.com) +- [Kyle Hausmann](mailto:kyle.hausmann@gmail.com) +- [Kyle Sunden](mailto:sunden@wisc.edu) +- Lawrence Chan +- [Linus Groh](mailto:mail@linusgroh.de) +- [Loren Carvalho](mailto:comradeloren@gmail.com) +- [Luka Sterbic](mailto:luka.sterbic@gmail.com) +- [LukasDrude](mailto:mail@lukas-drude.de) +- Mahmoud Hossam +- Mariatta +- [Matt VanEseltine](mailto:vaneseltine@gmail.com) +- [Matthew Clapp](mailto:itsayellow+dev@gmail.com) +- [Matthew Walster](mailto:matthew@walster.org) +- Max Smolens +- [Michael Aquilina](mailto:michaelaquilina@gmail.com) +- [Michael Flaxman](mailto:michael.flaxman@gmail.com) +- [Michael J. 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Vascellaro](mailto:S.Vascellaro@gmail.com) +- [Sunil Kapil](mailto:snlkapil@gmail.com) +- [Sébastien Eustace](mailto:sebastien.eustace@gmail.com) +- [Tal Amuyal](mailto:TalAmuyal@gmail.com) +- [Terrance](mailto:git@terrance.allofti.me) +- [Thom Lu](mailto:thomas.c.lu@gmail.com) +- [Thomas Grainger](mailto:tagrain@gmail.com) +- [Tim Gates](mailto:tim.gates@iress.com) +- [Tim Swast](mailto:swast@google.com) +- [Timo](mailto:timo_tk@hotmail.com) +- Toby Fleming +- [Tom Christie](mailto:tom@tomchristie.com) +- [Tony Narlock](mailto:tony@git-pull.com) +- [Tsuyoshi Hombashi](mailto:tsuyoshi.hombashi@gmail.com) +- [Tushar Chandra](mailto:tusharchandra2018@u.northwestern.edu) +- [Tzu-ping Chung](mailto:uranusjr@gmail.com) +- [Utsav Shah](mailto:ukshah2@illinois.edu) +- utsav-dbx +- vezeli +- [Ville Skyttä](mailto:ville.skytta@iki.fi) +- [Vishwas B Sharma](mailto:sharma.vishwas88@gmail.com) +- [Vlad Emelianov](mailto:volshebnyi@gmail.com) +- [williamfzc](mailto:178894043@qq.com) +- [wouter bolsterlee](mailto:wouter@bolsterl.ee) +- Yazdan +- [Yngve Høiseth](mailto:yngve@hoiseth.net) +- [Yurii Karabas](mailto:1998uriyyo@gmail.com) +- [Zac Hatfield-Dodds](mailto:zac@zhd.dev)