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https://github.com/dizballanze/gray

Less uncompromising Python code formatter
https://github.com/dizballanze/gray

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Less uncompromising Python code formatter

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README 

        
# gray



[![Package Version](https://badge.fury.io/py/gray.svg)](http://badge.fury.io/py/gray)

[![Build Status](https://travis-ci.org/dizballanze/gray.svg?branch=master)](https://travis-ci.org/dizballanze/gray)



Less uncompromising Python code formatter.



Gray stands on the shoulders of giants:



- [isort](https://timothycrosley.github.io/isort/) - imports sorting and more

- [pyupgrade](https://github.com/asottile/pyupgrade) - automatically upgrades syntax for newer versions of Python

- [autoflake](https://github.com/myint/autoflake) - remove unused imports and variables

- [add-trailing-comma](https://github.com/asottile/add-trailing-comma)

- [trim](https://github.com/myint/trim) - remove trailing whitespaces

- [unify](https://github.com/myint/unify) - unify quotes style

- [fixit](https://github.com/Instagram/Fixit) - various code formatters on LibCST

- [black](https://github.com/psf/black) - optional - the uncompromising Python code formatter



## Usage



```

usage:

            gray myapp.py

            gray myproj/ tests/

            gray --log-level debug --formatters isort,unify ~/app



Less uncompromising Python code formatter.



positional arguments:

  paths                 Paths to format (default: (PosixPath('.'),))



optional arguments:

  -h, --help            show this help message and exit

  --exclude EXCLUDE     A regular expression matching files and directories that should be

                        excluded from formatting. Passing an explicit empty value means not paths

                        get excluded. Use '/' as directory separator, including on Windows.

                        [default: (.*/)?(\.direnv|\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.ven

                        v|venv|\.svn|_build|buck-out|build|dist|__pypackages__)$] (default: (.*/)?

                        (\.direnv|\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|venv|\.svn|_bu

                        ild|buck-out|build|dist|__pypackages__)$)

  --extend-exclude EXTEND_EXCLUDE

                        An additional regular expression to use besides --exclude. This allows to

                        keep the default regex from --exclude. (default: None)

  --pool-size POOL_SIZE

                        process pool size (default: 8)

  --do-not-detect-venv  Don't try to detect virtualenv (default: False)



Logging options:

  --log-level {debug,info,warning,error,fatal}



Formatters options:

  -f FORMATTERS, --formatters FORMATTERS

                        Enabled formatters separated by comma (optional: black) (default: add-

                        trailing-comma,autoflake,fixit,isort,pyupgrade,trim,unify)

  --min-python-version MIN_PYTHON_VERSION

                        Minimum python version to support (default: (3, 9))



pyupgrade options:

  --pyupgrade-keep-percent-format PYUPGRADE_KEEP_PERCENT_FORMAT

                        Do not upgrade percent formatted strings to f-strings (default: False)

  --pyupgrade-keep-mock PYUPGRADE_KEEP_MOCK

                        Disable rewrite of mock imports (default: False)

  --pyupgrade-keep-runtime-typing PYUPGRADE_KEEP_RUNTIME_TYPING

                        Disable pep 585 typing rewrites (default: False)



unify options:

  --unify-quote UNIFY_QUOTE

                        preferred quote (default: ")



isort options:

  --isort-profile ISORT_PROFILE

                        Base profile type to use for configuration. (default: None)

  --isort-line-length ISORT_LINE_LENGTH

                        The max length of an import line (used for wrapping long imports)

                        (default: 80)

  --isort-wrap-length ISORT_WRAP_LENGTH

                        Specifies how long lines that are wrapped should be, if not set

                        line_length is used. NOTE: wrap_length must be LOWER than or equal to

                        line_length (default: None)

  --isort-multi-line-output ISORT_MULTI_LINE_OUTPUT

                        Multi line output (0-grid, 1-vertical, 2-hanging, 3-vert-hanging, 4-vert-

                        grid, 5-vert-grid-grouped, 6-deprecated-alias-for-5, 7-noqa, 8-vertical-

                        hanging-indent-bracket, 9-vertical-prefix-from-module-import, 10-hanging-

                        indent-with-parentheses). (default: 5)

  --isort-known-third-party ISORT_KNOWN_THIRD_PARTY

                        Force isort to recognize a module as being part of a third party library.

                        (default: None)

  --isort-known-first-party ISORT_KNOWN_FIRST_PARTY

                        Force isort to recognize a module as being part of the current python

                        project. (default: None)

  --isort-known-local-folder ISORT_KNOWN_LOCAL_FOLDER

                        Force isort to recognize a module as being a local folder. Generally, this

                        is reserved for relative imports (from . import module). (default: None)

  --isort-virtual-env ISORT_VIRTUAL_ENV

                        virtual env path (default: env)

  --isort-include-trailing-comma ISORT_INCLUDE_TRAILING_COMMA

                        Includes a trailing comma on multi line imports that include parentheses.

                        (default: True)

  --isort-lines-after-imports ISORT_LINES_AFTER_IMPORTS

                        empty lines after imports (default: 2)

  --isort-skip-gitignore ISORT_SKIP_GITIGNORE

                        Treat project as a git repository and ignore files listed in .gitignore.

                        (default: True)

  --isort-use-parentheses ISORT_USE_PARENTHESES

                        Use parentheses for line continuation on length limit instead of slashes.

                        **NOTE**: This is separate from wrap modes, and only affects how

                        individual lines that are too long get continued, not sections of multiple

                        imports.. (default: True)

  --isort-length-sort ISORT_LENGTH_SORT

                        Sort imports by their string length. (default: False)



autoflake options:

  --autoflake-ignore-init-module-imports AUTOFLAKE_IGNORE_INIT_MODULE_IMPORTS

  --autoflake-expand-star-imports AUTOFLAKE_EXPAND_STAR_IMPORTS

  --autoflake-remove-all-unused-imports AUTOFLAKE_REMOVE_ALL_UNUSED_IMPORTS

  --autoflake-remove-duplicate-keys AUTOFLAKE_REMOVE_DUPLICATE_KEYS

  --autoflake-remove-unused-variables AUTOFLAKE_REMOVE_UNUSED_VARIABLES



trim options:

  --trim-leading-newlines TRIM_LEADING_NEWLINES



fixit options:

  --fixit-redundant-fstrings FIXIT_REDUNDANT_FSTRINGS

  --fixit-redundant-lambdas FIXIT_REDUNDANT_LAMBDAS

  --fixit-redundant-list-comprehensions FIXIT_REDUNDANT_LIST_COMPREHENSIONS

  --fixit-to-comprehensions FIXIT_TO_COMPREHENSIONS

  --fixit-to-literals FIXIT_TO_LITERALS

  --fixit-to-fstrings FIXIT_TO_FSTRINGS



black options:

  --black-line-length BLACK_LINE_LENGTH

                        How many characters per line to allow. (default: 88)

  --black-skip-magic-trailing-comma BLACK_SKIP_MAGIC_TRAILING_COMMA

                        Don't use trailing commas as a reason to split lines. (default: False)

  --black-skip-string-normalization BLACK_SKIP_STRING_NORMALIZATION

                        Don't normalize string quotes or prefixes. (default: False)



Args that start with '--' (eg. --exclude) can also be set in a config file (/Users/stephane/.gray

or /etc/gray.conf or ./gray.conf). Config file syntax allows: key=value, flag=true, stuff=[a,b,c]

(for details, see syntax at https://goo.gl/R74nmi). If an arg is specified in more than one place,

then commandline values override config file values which override defaults.

```



## Git Hook



You can setup gray formatting before each commit with pre-commit git hook.

Add following file to `.git/hooks/pre-commit` and make it executable with

`chmod +x .git/hooks/pre-commit`.



```python

#!/usr/bin/env python

from gray.hooks import git_pre_commit



exit(git_pre_commit(stop_on_modify=True))

```



If `stop_on_modify` argument is `True`, hook will prevent commit if there are

any unstaged changes in files you about to commit.



Otherwise, any unstaged changes in this files will be added to the index

by the hook.



## Config file



Gray is looking for config file in `./gray.conf`, `/etc/gray.conf` or `~/.gray`.



Example of grayconf:



```

formatters = add-trailing-comma,isort,unify

min-python-version = 3.5

```



## Features



* TODO



## Git pre-commit hook



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/dizballanze/gray

    rev: master # Replace by any tag/branch: https://github.com/dizballanze/gray/tags

    hooks:

      - id: gray

```



and run `pre-commit install`.



## Using with Sourcetree

Sourcetree may run without `gray` being available via `PATH`.



### MacOS

Make sure `gray` is available via `PATH` and run `open /Applications/Sourcetree.app`.

Or better [create](https://stackoverflow.com/a/281455/1555653) an `Automator` workflow 

with `source ~/.bash_profile && open /Applications/Sourcetree.app` script.