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[etc/vim.git] / docs / pyproject_toml.md
1 [//]: # "NOTE: THIS FILE WAS AUTOGENERATED FROM README.md"
2
3 # pyproject.toml
4
5 _Black_ is able to read project-specific default values for its command line options
6 from a `pyproject.toml` file. This is especially useful for specifying custom
7 `--include` and `--exclude` patterns for your project.
8
9 **Pro-tip**: If you're asking yourself "Do I need to configure anything?" the answer is
10 "No". _Black_ is all about sensible defaults.
11
12 ## What on Earth is a `pyproject.toml` file?
13
14 [PEP 518](https://www.python.org/dev/peps/pep-0518/) defines `pyproject.toml` as a
15 configuration file to store build system requirements for Python projects. With the help
16 of tools like [Poetry](https://python-poetry.org/) or
17 [Flit](https://flit.readthedocs.io/en/latest/) it can fully replace the need for
18 `setup.py` and `setup.cfg` files.
19
20 ## Where _Black_ looks for the file
21
22 By default _Black_ looks for `pyproject.toml` starting from the common base directory of
23 all files and directories passed on the command line. If it's not there, it looks in
24 parent directories. It stops looking when it finds the file, or a `.git` directory, or a
25 `.hg` directory, or the root of the file system, whichever comes first.
26
27 If you're formatting standard input, _Black_ will look for configuration starting from
28 the current working directory.
29
30 You can also explicitly specify the path to a particular file that you want with
31 `--config`. In this situation _Black_ will not look for any other file.
32
33 If you're running with `--verbose`, you will see a blue message if a file was found and
34 used.
35
36 Please note `blackd` will not use `pyproject.toml` configuration.
37
38 ## Configuration format
39
40 As the file extension suggests, `pyproject.toml` is a
41 [TOML](https://github.com/toml-lang/toml) file. It contains separate sections for
42 different tools. _Black_ is using the `[tool.black]` section. The option keys are the
43 same as long names of options on the command line.
44
45 Note that you have to use single-quoted strings in TOML for regular expressions. It's
46 the equivalent of r-strings in Python. Multiline strings are treated as verbose regular
47 expressions by Black. Use `[ ]` to denote a significant space character.
48
49 <details>
50 <summary>Example <code>pyproject.toml</code></summary>
51
52 ```toml
53 [tool.black]
54 line-length = 88
55 target-version = ['py37']
56 include = '\.pyi?$'
57 exclude = '''
58 # A regex preceded with ^/ will apply only to files and directories
59 # in the root of the project.
60 ^/(
61   (
62       \.eggs         # exclude a few common directories in the
63     | \.git          # root of the project
64     | \.hg
65     | \.mypy_cache
66     | \.tox
67     | \.venv
68     | _build
69     | buck-out
70     | build
71     | dist
72   )/
73   | foo.py           # also separately exclude a file named foo.py in
74                      # the root of the project
75 )
76 '''
77 ```
78
79 </details>
80
81 ## Lookup hierarchy
82
83 Command-line options have defaults that you can see in `--help`. A `pyproject.toml` can
84 override those defaults. Finally, options provided by the user on the command line
85 override both.
86
87 _Black_ will only ever use one `pyproject.toml` file during an entire run. It doesn't
88 look for multiple files, and doesn't compose configuration from different levels of the
89 file hierarchy.