X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/3ad0f5855c46410652b27b5e09c6f22314241757..de806405d2934b629d67e2a6317ad7e826765a20:/README.md?ds=inline diff --git a/README.md b/README.md index 3eb8ee4..cdd8a52 100644 --- a/README.md +++ b/README.md @@ -1,13 +1,14 @@ -![Black Logo](https://raw.githubusercontent.com/ambv/black/master/docs/_static/logo2-readme.png) +![Black Logo](https://raw.githubusercontent.com/python/black/master/docs/_static/logo2-readme.png)

The Uncompromising Code Formatter

-Build Status -Documentation Status -Coverage Status -License: MIT -PyPI -Code style: black +Build Status +Documentation Status +Coverage Status +License: MIT +PyPI +Downloads +Code style: black

> “Any color you like.” @@ -26,8 +27,26 @@ content instead. *Black* makes code review faster by producing the smallest diffs possible. +Try it out now using the [Black Playground](https://black.now.sh). -## Installation and Usage +--- + +*Contents:* **[Installation and usage](#installation-and-usage)** | +**[Code style](#the-black-code-style)** | +**[pyproject.toml](#pyprojecttoml)** | +**[Editor integration](#editor-integration)** | +**[blackd](#blackd)** | +**[Version control integration](#version-control-integration)** | +**[Ignoring unmodified files](#ignoring-unmodified-files)** | +**[Testimonials](#testimonials)** | +**[Show your style](#show-your-style)** | +**[Contributing](#contributing-to-black)** | +**[Change Log](#change-log)** | +**[Authors](#authors)** + +--- + +## Installation and usage ### Installation @@ -45,28 +64,65 @@ black {source_file_or_directory} ### Command line options -Black doesn't provide many options. You can list them by running +*Black* doesn't provide many options. You can list them by running `black --help`: ```text black [OPTIONS] [SRC]... 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. + -l, --line-length INTEGER How many characters per line to allow. + [default: 88] + -t, --target-version [py27|py33|py34|py35|py36|py37|py38] + Python versions that should be supported by + Black's output. [default: per-file auto- + detection] + --py36 Allow using Python 3.6-only syntax on all + input files. This will put trailing commas + in function signatures and calls also after + *args and **kwargs. Deprecated; use + --target-version instead. [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. + --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] + --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: /(\.eggs|\.git|\.hg|\.mypy + _cache|\.nox|\.tox|\.venv|_build|buck- + out|build|dist)/] + -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 + --exclude=. + --version Show the version and exit. + --config PATH Read configuration from PATH. + -h, --help Show this message and exit. ``` *Black* is a well-behaved Unix-style command-line tool: @@ -78,14 +134,16 @@ Options: used). -### NOTE: This is an early pre-release +### NOTE: This is a beta product -*Black* can already successfully format itself and the standard library. +*Black* is already successfully used by several 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 -"Alpha" trove classifier, as well as by the "a" in the version number. +"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**. +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 @@ -97,7 +155,8 @@ original. This slows it down. If you're feeling confident, use *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 +blocks that start with `# fmt: off` and end with `# fmt: on`. `# fmt: on/off` +have to be on the same level of indentation. It also recognizes [YAPF](https://github.com/google/yapf)'s block comments to the same effect, as a courtesy for straddling code. @@ -131,13 +190,13 @@ brackets and put that in a separate indented line. ```py3 # in: -l = [[n for n in list_bosses()], [n for n in list_employees()]] +ImportantClass.important_method(exc, limit, lookup_lines, capture_locals, extra_argument) # out: -l = [ - [n for n in list_bosses()], [n for n in list_employees()] -] +ImportantClass.important_method( + exc, limit, lookup_lines, capture_locals, extra_argument +) ``` If that still doesn't fit the bill, it will decompose the internal @@ -150,7 +209,7 @@ separate lines. ```py3 # in: -def very_important_function(template: str, *variables, file: os.PathLike, debug: bool = False): +def very_important_function(template: str, *variables, file: os.PathLike, engine: str, header: bool = True, debug: bool = False): """Applies `variables` to the `template` and writes to `file`.""" with open(file, 'w') as f: ... @@ -161,6 +220,8 @@ def very_important_function( template: str, *variables, file: os.PathLike, + engine: str, + header: bool = True, debug: bool = False, ): """Applies `variables` to the `template` and writes to `file`.""" @@ -176,14 +237,30 @@ 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 line of "from" imports cannot fit in the allotted length, it's always split -into one per line. Imports tend to change often and this minimizes diffs, as well -as enables readers of code to easily find which commit introduced a particular -import. This exception also makes *Black* compatible with -[isort](https://pypi.org/p/isort/). Use `multi_line_output=3`, -`include_trailing_comma=True`, `force_grid_wrap=0`, and `line_length=88` in your -isort config. +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](https://pypi.org/p/isort/) with +the following configuration. +
+A compatible `.isort.cfg` + +``` +[settings] +multi_line_output=3 +include_trailing_comma=True +force_grid_wrap=0 +use_parentheses=True +line_length=88 +``` + +The equivalent command line is: +``` +$ isort --multi-line=3 --trailing-comma --force-grid-wrap=0 --use-parentheses --line-width=88 [ file.py ] +``` +
### Line length @@ -217,7 +294,8 @@ ignore = E501 ``` 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 +If you're curious about the reasoning behind B950, +[Bugbear's documentation](https://github.com/PyCQA/flake8-bugbear#opinionated-warnings) 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". @@ -235,9 +313,17 @@ 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 not put empty lines between -function/class definitions and standalone comments that immediately precede -the given function/class. +after module-level functions and classes. *Black* will not put empty +lines between function/class definitions and standalone comments that +immediately precede the given function/class. + +*Black* will enforce single empty lines between a class-level docstring +and the first following field or method. This conforms to +[PEP 257](https://www.python.org/dev/peps/pep-0257/#multi-line-docstrings). + +*Black* won't insert empty lines after function docstrings unless that +empty line is required due to an inner function starting immediately +after. ### Trailing commas @@ -268,6 +354,7 @@ 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 (`'` @@ -283,11 +370,11 @@ 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). +[#26](https://github.com/python/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 +text. They match the docstring standard described in [PEP 257](https://www.python.org/dev/peps/pep-0257/#what-is-a-docstring). +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. @@ -297,7 +384,21 @@ 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 +If you are adopting *Black* in a large project with pre-existing string +conventions (like the popular ["single quotes for data, double quotes for +human-readable strings"](https://stackoverflow.com/a/56190)), you can +pass `--skip-string-normalization` on the command line. This is meant as +an adoption helper, avoid using this for new projects. + +### Numeric literals + +*Black* standardizes most numeric literals to use lowercase letters for the +syntactic parts and uppercase letters for the digits themselves: `0xAB` +instead of `0XAB` and `1e10` instead of `1E10`. Python 2 long literals are +styled as `2L` instead of `2l` to avoid confusion between `l` and `1`. + + +### 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 @@ -308,6 +409,7 @@ 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. + ### Slices PEP 8 [recommends](https://www.python.org/dev/peps/pep-0008/#whitespace-in-expressions-and-statements) @@ -321,6 +423,7 @@ This behaviour may raise ``E203 whitespace before ':'`` warnings in style guide enforcement tools like Flake8. Since ``E203`` 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 @@ -354,13 +457,14 @@ return not (this or that) decision = (maybe.this() and values > 0) or (maybe.that() and values < 0) ``` + ### Call chains Some popular APIs, like ORMs, use call chaining. This API style is known as a [fluent interface](https://en.wikipedia.org/wiki/Fluent_interface). -*Black* formats those treating dots that follow a call or an indexing +*Black* formats those by treating dots that follow a call or an indexing operation like a very low priority delimiter. It's easier to show the -behavior than to explain it. Look at the example:: +behavior than to explain it. Look at the example: ```py3 def example(session): result = ( @@ -374,6 +478,7 @@ def example(session): ) ``` + ### Typing stub files PEP 484 describes the syntax for type hints in Python. One of the @@ -412,6 +517,102 @@ a future version of the formatter: * use `float` instead of `Union[int, float]`. +## pyproject.toml + +*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` +patterns for your project. + +**Pro-tip**: If you're asking yourself "Do I need to configure anything?" +the answer is "No". *Black* is all about sensible defaults. + + +### What on Earth is a `pyproject.toml` file? + +[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://poetry.eustace.io/) or +[Flit](https://flit.readthedocs.io/en/latest/) it can fully replace the +need for `setup.py` and `setup.cfg` files. + + +### Where *Black* looks for the file + +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. + +If you're formatting standard input, *Black* will look for configuration +starting from the current working directory. + +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. + +If you're running with `--verbose`, you will see a blue message if +a file was found and used. + +Please note `blackd` will not use `pyproject.toml` configuration. + + +### Configuration format + +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. + +
+Example `pyproject.toml` + +```toml +[tool.black] +line-length = 88 +target-version = ['py37'] +include = '\.pyi?$' +exclude = ''' + +( + /( + \.eggs # exclude a few common directories in the + | \.git # root of the project + | \.hg + | \.mypy_cache + | \.tox + | \.venv + | _build + | buck-out + | build + | dist + )/ + | foo.py # also separately exclude a file named foo.py in + # the root of the project +) +''' +``` + +
+ +### Lookup hierarchy + +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. + +*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. + + ## Editor integration ### Emacs @@ -419,41 +620,67 @@ a future version of the formatter: Use [proofit404/blacken](https://github.com/proofit404/blacken). -### PyCharm +### PyCharm/IntelliJ IDEA 1. Install `black`. - $ pip install black +```console +$ pip install black +``` 2. Locate your `black` installation folder. - On MacOS / Linux / BSD: + On macOS / Linux / BSD: - $ which black - /usr/local/bin/black # possible location +```console +$ which black +/usr/local/bin/black # possible location +``` On Windows: - $ where black - %LocalAppData%\Programs\Python\Python36-32\Scripts\black.exe # possible location +```console +$ where black +%LocalAppData%\Programs\Python\Python36-32\Scripts\black.exe # possible location +``` + +3. Open External tools in PyCharm/IntelliJ IDEA + + On macOS: + +```PyCharm -> Preferences -> Tools -> External Tools``` -3. Open External tools in PyCharm with `File -> Settings -> Tools -> External Tools`. + On Windows / Linux / BSD: + +```File -> Settings -> Tools -> External Tools``` 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: - - Arguments: $FilePath$ + - Arguments: `"$FilePath$"` 5. Format the currently opened file by selecting `Tools -> External Tools -> black`. - - Alternatively, you can set a keyboard shortcut by navigating to `Preferences -> Keymap`. + - Alternatively, you can set a keyboard shortcut by navigating to `Preferences or Settings -> Keymap -> External Tools -> External Tools - Black`. +6. Optionally, run Black on every file save: + + 1. Make sure you have the [File Watcher](https://plugins.jetbrains.com/plugin/7177-file-watchers) plugin installed. + 2. Go to `Preferences or Settings -> Tools -> File Watchers` and click `+` to add a new watcher: + - Name: Black + - File type: Python + - Scope: Project Files + - Program: + - Arguments: `$FilePath$` + - Output paths to refresh: `$FilePath$` + - Working directory: `$ProjectFileDir$` + - Uncheck "Auto-save edited files to trigger the watcher" ### Vim Commands and shortcuts: -* `,=` or `:Black` to format the entire file (ranges not supported); +* `: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. @@ -461,21 +688,22 @@ Commands and shortcuts: Configuration: * `g:black_fast` (defaults to `0`) * `g:black_linelength` (defaults to `88`) +* `g:black_skip_string_normalization` (defaults to `0`) * `g:black_virtualenv` (defaults to `~/.vim/black`) To install with [vim-plug](https://github.com/junegunn/vim-plug): ``` -Plug 'ambv/black', +Plug 'python/black' ``` or with [Vundle](https://github.com/VundleVim/Vundle.vim): ``` -Plugin 'ambv/black' +Plugin 'python/black' ``` -or you can copy the plugin from [plugin/black.vim](https://github.com/ambv/black/tree/master/plugin/black.vim). +or you can copy the plugin from [plugin/black.vim](https://github.com/python/black/tree/master/plugin/black.vim). Let me know if this requires any changes to work with Vim 8's builtin `packadd`, or Pathogen, and so on. @@ -492,9 +720,15 @@ install *Black* (for example you want to run a version from master), create a virtualenv manually and point `g:black_virtualenv` to it. The plugin will use it. +To run *Black* on save, add the following line to `.vimrc` or `init.vim`: + +``` +autocmd BufWritePre *.py execute ':Black' +``` + **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`. +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. @@ -502,31 +736,118 @@ to do this. ### Visual Studio Code -Use [joslarson.black-vscode](https://marketplace.visualstudio.com/items?itemName=joslarson.black-vscode). +Use the [Python extension](https://marketplace.visualstudio.com/items?itemName=ms-python.python) +([instructions](https://code.visualstudio.com/docs/python/editing#_formatting)). + ### SublimeText 3 Use [sublack plugin](https://github.com/jgirardet/sublack). -### IPython Notebook Magic + +### Jupyter Notebook Magic Use [blackcellmagic](https://github.com/csurfer/blackcellmagic). + +### Python Language Server + +If your editor supports the [Language Server Protocol](https://langserver.org/) +(Atom, Sublime Text, Visual Studio Code and many more), you can use +the [Python Language Server](https://github.com/palantir/python-language-server) with the +[pyls-black](https://github.com/rupert/pyls-black) plugin. + + +### Atom/Nuclide + +Use [python-black](https://atom.io/packages/python-black). + + ### Other editors -Atom/Nuclide integration is planned by the author, others will -require external contributions. +Other editors will require external contributions. Patches welcome! ✨ 🍰 ✨ 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)). +[use `-` as the file name](https://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. -This can be used for example with PyCharm's [File Watchers](https://www.jetbrains.com/help/pycharm/file-watchers.html). +This can be used for example with PyCharm's or IntelliJ's [File Watchers](https://www.jetbrains.com/help/pycharm/file-watchers.html). + +## blackd + +`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. + +### Usage +`blackd` is not packaged alongside *Black* by default because it has additional +dependencies. You will need to do `pip install black[d]` to install it. + +You can start the server on the default port, binding only to the local interface +by running `blackd`. You will see a single line mentioning the server's version, +and the host and port it's listening on. `blackd` will then print an access log +similar to most web servers on standard output, merged with any exception traces +caused by invalid formatting requests. + +`blackd` provides even less options than *Black*. You can see them by running +`blackd --help`: + +```text +Usage: blackd [OPTIONS] + +Options: + --bind-host TEXT Address to bind the server to. + --bind-port INTEGER Port to listen on + --version Show the version and exit. + -h, --help Show this message and exit. +``` + +### Protocol + +`blackd` only accepts `POST` requests at the `/` path. The body of the request +should contain the python source code to be formatted, encoded +according to the `charset` field in the `Content-Type` request header. If no +`charset` is specified, `blackd` assumes `UTF-8`. + +There are a few HTTP headers that control how the source is formatted. These +correspond to command line flags for *Black*. There is one exception to this: +`X-Protocol-Version` which if present, should have the value `1`, otherwise the +request is rejected with `HTTP 501` (Not Implemented). + +The headers controlling how code is formatted are: + + - `X-Line-Length`: corresponds to the `--line-length` command line flag. + - `X-Skip-String-Normalization`: corresponds to the `--skip-string-normalization` + command line flag. If present and its value is not the empty string, no string + normalization will be performed. + - `X-Fast-Or-Safe`: if set to `fast`, `blackd` will act as *Black* does when + passed the `--fast` command line flag. + - `X-Python-Variant`: if set to `pyi`, `blackd` will act as *Black* does when + passed the `--pyi` command line flag. Otherwise, its value must correspond to + a Python version or a set of comma-separated Python versions, optionally + prefixed with `py`. For example, to request code that is compatible + with Python 3.5 and 3.6, set the header to `py3.5,py3.6`. + +If any of these headers are set to invalid values, `blackd` returns a `HTTP 400` +error response, mentioning the name of the problematic header in the message body. + +Apart from the above, `blackd` can produce the following response codes: + + - `HTTP 204`: If the input is already well-formatted. The response body is + empty. + - `HTTP 200`: If formatting was needed on the input. The response body + contains the blackened Python code, and the `Content-Type` header is set + accordingly. + - `HTTP 400`: If the input contains a syntax error. Details of the error are + returned in the response body. + - `HTTP 500`: If there was any kind of error while trying to format the input. + The response body contains a textual representation of the error. ## Version control integration @@ -535,42 +856,47 @@ 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 +- repo: https://github.com/python/black rev: stable hooks: - id: black - args: [--line-length=88, --safe] - python_version: python3.6 + language_version: 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. +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` +for an example. +If you're already using Python 3.7, switch the `language_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 +## Ignoring unmodified files + +*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 +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\\AppData\Local\black\black\Cache\\cache..pickle` -* macOS: `/Users//Library/Caches/black//cache..pickle` -* Linux: `/home//.cache/black//cache..pickle` +* Windows: `C:\\Users\\AppData\Local\black\black\Cache\\cache...pickle` +* macOS: `/Users//Library/Caches/black//cache...pickle` +* Linux: `/home//.cache/black//cache...pickle` + +`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. ## 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. +> *Black* is opinionated so you don't have to be. -**Hynek Schlawack**, [creator of `attrs`](http://www.attrs.org/), core +**Hynek Schlawack**, [creator of `attrs`](https://www.attrs.org/), core developer of Twisted and CPython: > An auto-formatter that doesn't suck is all I want for Xmas! @@ -590,10 +916,16 @@ and [`pipenv`](https://docs.pipenv.org/): Use the badge in your project's README.md: ```markdown -[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black) +[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/python/black) ``` -Looks like this: [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black) +Using the badge in README.rst: +``` +.. image:: https://img.shields.io/badge/code%20style-black-000000.svg + :target: https://github.com/python/black +``` + +Looks like this: [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/python/black) ## License @@ -601,7 +933,7 @@ Looks like this: [![Code style: black](https://img.shields.io/badge/code%20style MIT -## Contributing to Black +## Contributing to *Black* In terms of inspiration, *Black* is about as configurable as *gofmt*. This is deliberate. @@ -619,9 +951,206 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md). ## Change Log -### 18.5a0 (unreleased) +### 19.5b0 + +* don't produce invalid code for `from` ... `import` blocks with comments + (#829) + +* fix grammar selection (#765) + +* fix feature detection for trailing commas in function definitions and + call sites (#763) + +* fix bug that led *Black* format some code with a line length target of 1 + (#762) + +### 19.3b0 + +* new option `--target-version` to control which Python versions + *Black*-formatted code should target (#618) + +* deprecated `--py36` (use `--target-version=py36` instead) (#724) + +* *Black* no longer normalizes numeric literals to include `_` separators (#696) + +* long `del` statements are now split into multiple lines (#698) + +* type comments are no longer mangled in function signatures + +* improved performance of formatting deeply nested data structures (#509) + +* *Black* now properly formats multiple files in parallel on + Windows (#632) + +* *Black* now creates cache files atomically which allows it to be used + in parallel pipelines (like `xargs -P8`) (#673) + +* *Black* now correctly indents comments in files that were previously + formatted with tabs (#262) + +* `blackd` now supports CORS (#622) + +### 18.9b0 + +* numeric literals are now formatted by *Black* (#452, #461, #464, #469): + + * numeric literals are normalized to include `_` separators on Python 3.6+ code + + * added `--skip-numeric-underscore-normalization` to disable the above behavior and + leave numeric underscores as they were in the input + + * code with `_` in numeric literals is recognized as Python 3.6+ + + * most letters in numeric literals are lowercased (e.g., in `1e10`, `0x01`) + + * hexadecimal digits are always uppercased (e.g. `0xBADC0DE`) + +* added `blackd`, see [its documentation](#blackd) for more info (#349) + +* adjacent string literals are now correctly split into multiple lines (#463) + +* trailing comma is now added to single imports that don't fit on a line (#250) + +* cache is now populated when `--check` is successful for a file which speeds up + consecutive checks of properly formatted unmodified files (#448) + +* whitespace at the beginning of the file is now removed (#399) + +* fixed mangling [pweave](http://mpastell.com/pweave/) and + [Spyder IDE](https://pythonhosted.org/spyder/) special comments (#532) + +* fixed unstable formatting when unpacking big tuples (#267) + +* fixed parsing of `__future__` imports with renames (#389) + +* fixed scope of `# fmt: off` when directly preceding `yield` and other nodes (#385) + +* fixed formatting of lambda expressions with default arguments (#468) + +* fixed ``async for`` statements: *Black* no longer breaks them into separate + lines (#372) + +* note: the Vim plugin stopped registering ``,=`` as a default chord as it turned out + to be a bad idea (#415) + + +### 18.6b4 + +* hotfix: don't freeze when multiple comments directly precede `# fmt: off` (#371) + + +### 18.6b3 + +* typing stub files (`.pyi`) now have blank lines added after constants (#340) + +* `# fmt: off` and `# fmt: on` are now much more dependable: + + * they now work also within bracket pairs (#329) + + * they now correctly work across function/class boundaries (#335) + + * they now work when an indentation block starts with empty lines or misaligned + comments (#334) + +* made Click not fail on invalid environments; note that Click is right but the + likelihood we'll need to access non-ASCII file paths when dealing with Python source + code is low (#277) + +* fixed improper formatting of f-strings with quotes inside interpolated + expressions (#322) + +* fixed unnecessary slowdown when long list literals where found in a file + +* fixed unnecessary slowdown on AST nodes with very many siblings + +* fixed cannibalizing backslashes during string normalization + +* fixed a crash due to symbolic links pointing outside of the project directory (#338) + + +### 18.6b2 + +* added `--config` (#65) + +* added `-h` equivalent to `--help` (#316) + +* fixed improper unmodified file caching when `-S` was used + +* fixed extra space in string unpacking (#305) + +* fixed formatting of empty triple quoted strings (#313) + +* fixed unnecessary slowdown in comment placement calculation on lines without + comments + + +### 18.6b1 + +* hotfix: don't output human-facing information on stdout (#299) + +* hotfix: don't output cake emoji on non-zero return code (#300) + + +### 18.6b0 + +* added `--include` and `--exclude` (#270) + +* added `--skip-string-normalization` (#118) + +* added `--verbose` (#283) + +* the header output in `--diff` now actually conforms to the unified diff spec + +* fixed long trivial assignments being wrapped in unnecessary parentheses (#273) + +* fixed unnecessary parentheses when a line contained multiline strings (#232) + +* fixed stdin handling not working correctly if an old version of Click was + used (#276) + +* *Black* now preserves line endings when formatting a file in place (#258) + + +### 18.5b1 + +* added `--pyi` (#249) + +* added `--py36` (#249) + +* Python grammar pickle caches are stored with the formatting caches, making + *Black* work in environments where site-packages is not user-writable (#192) + +* *Black* now enforces a PEP 257 empty line after a class-level docstring + (and/or fields) and the first method + +* fixed invalid code produced when standalone comments were present in a trailer + that was omitted from line splitting on a large expression (#237) + +* fixed optional parentheses being removed within `# fmt: off` sections (#224) + +* fixed invalid code produced when stars in very long imports were incorrectly + wrapped in optional parentheses (#234) + +* fixed unstable formatting when inline comments were moved around in + a trailer that was omitted from line splitting on a large expression + (#238) + +* fixed extra empty line between a class declaration and the first + method if no class docstring or fields are present (#219) + +* fixed extra empty line between a function signature and an inner + function or inner class (#196) + + +### 18.5b0 + +* call chains are now formatted according to the + [fluent interfaces](https://en.wikipedia.org/wiki/Fluent_interface) + style (#67) -* call chains are now formatted according to the [fluent interfaces](https://en.wikipedia.org/wiki/Fluent_interface) style (#67) +* data structure literals (tuples, lists, dictionaries, and sets) are + now also always exploded like imports when they don't fit in a single + line (#152) * slices are now formatted according to PEP 8 (#178) @@ -686,10 +1215,10 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md). * generalized star expression handling, including double stars; this fixes multiplication making expressions "unsafe" for trailing commas (#132) -* Black no longer enforces putting empty lines behind control flow statements +* *Black* no longer enforces putting empty lines behind control flow statements (#90) -* Black now splits imports like "Mode 3 + trailing comma" of isort (#127) +* *Black* now splits imports like "Mode 3 + trailing comma" of isort (#127) * fixed comment indentation when a standalone comment closes a block (#16, #32) @@ -742,16 +1271,16 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md). (#75) * fixed handling of standalone comments within nested bracketed - expressions; Black will no longer produce super long lines or put all + 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) + would cause *Black* to not emit the rest of the file (#95) -* when CTRL+C is pressed while formatting many files, Black no longer +* 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 @@ -798,7 +1327,7 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md). ### 18.3a2 * 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) + instead of at the end, following [a recent change to PEP 8](https://github.com/python/peps/commit/c59c4376ad233a62ca4b3a6060c81368bd21e85b) (#21) * ignore empty bracket pairs while splitting. This avoids very weirdly @@ -857,6 +1386,7 @@ Glued together by [Łukasz Langa](mailto:lukasz@langa.pl). Maintained with [Carol Willing](mailto:carolcode@willingconsulting.com), [Carl Meyer](mailto:carl@oddbird.net), +[Jelle Zijlstra](mailto:jelle.zijlstra@gmail.com), [Mika Naylor](mailto:mail@autophagy.io), and [Zsolt Dollenstein](mailto:zsol.zsol@gmail.com). @@ -865,12 +1395,19 @@ Multiple contributions by: * [Artem Malyshev](mailto:proofit404@gmail.com) * [Christian Heimes](mailto:christian@python.org) * [Daniel M. Capella](mailto:polycitizen@gmail.com) -* [Eli Treuherz](mailto:eli.treuherz@cgi.com) +* [Eli Treuherz](mailto:eli@treuherz.com) +* hauntsaninja * Hugo van Kemenade * [Ivan Katanić](mailto:ivan.katanic@gmail.com) -* [Jelle Zijlstra](mailto:jelle.zijlstra@gmail.com) * [Jonas Obrist](mailto:ojiidotch@gmail.com) +* [Luka Sterbic](mailto:luka.sterbic@gmail.com) * [Miguel Gaiowski](mailto:miggaiowski@gmail.com) +* [Miroslav Shubernetskiy](mailto:miroslav@miki725.com) +* [Neraste](mailto:neraste.herr10@gmail.com) * [Osaetin Daniel](mailto:osaetindaniel@gmail.com) +* [Peter Bengtsson](mailto:mail@peterbe.com) +* [Stavros Korokithakis](mailto:hi@stavros.io) * [Sunil Kapil](mailto:snlkapil@gmail.com) +* [Utsav Shah](mailto:ukshah2@illinois.edu) * [Vishwas B Sharma](mailto:sharma.vishwas88@gmail.com) +* [Chuck Wooters](mailto:chuck.wooters@microsoft.com)