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436e12f290
black/CHANGES.md
Holger Brunn 436e12f290
Add script to ease migration to black (#3038) 
* Add script to ease migration to black

* Update CHANGES.md

Co-authored-by: Cooper Lees <me@cooperlees.com>
2022-06-01 11:20:02 -07:00

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# Change Log
## Unreleased
### Highlights
<!-- Include any especially major or disruptive changes here -->
### Style
<!-- Changes that affect Black's stable style -->
- Fix unstable formatting involving `# fmt: skip` comments without internal spaces
(#2970)
### Preview style
<!-- Changes that affect Black's preview style -->
- Fixed bug where docstrings with triple quotes could exceed max line length (#3044)
- Remove redundant parentheses around awaited objects (#2991)
- Parentheses around return annotations are now managed (#2990)
- Remove unnecessary parentheses from `with` statements (#2926)
### _Blackd_
<!-- Changes to blackd -->
### Configuration
<!-- Changes to how Black can be configured -->
### Documentation
<!-- Major changes to documentation and policies. Small docs changes
don't need a changelog entry. -->
### Integrations
<!-- For example, Docker, GitHub Actions, pre-commit, editors -->
- Add migrate-black.py script to ease migration to black formatted git project (#3038)
### Output
<!-- Changes to Black's terminal output and error messages -->
- Output python version and implementation as part of `--version` flag (#2997)
### Packaging
<!-- Changes to how Black is packaged, such as dependency requirements -->
- Use `tomli` instead of `tomllib` on Python 3.11 builds where `tomllib` is not
available (#2987)
### Parser
- [PEP 654](https://peps.python.org/pep-0654/#except) syntax (for example,
`except *ExceptionGroup:`) is now supported (#3016)
- [PEP 646](https://peps.python.org/pep-0646) syntax (for example,
`Array[Batch, *Shape]` or `def fn(*args: *T) -> None`) is now supported (#3071)
<!-- Changes to the parser or to version autodetection -->
### Performance
<!-- Changes that improve Black's performance. -->
### Vim Plugin
- Fixed strtobool function. It didn't parse true/on/false/off. (#3025)
## 22.3.0
### Preview style
- Code cell separators `#%%` are now standardised to `# %%` (#2919)
- Remove unnecessary parentheses from `except` statements (#2939)
- Remove unnecessary parentheses from tuple unpacking in `for` loops (#2945)
- Avoid magic-trailing-comma in single-element subscripts (#2942)
### Configuration
- Do not format `__pypackages__` directories by default (#2836)
- Add support for specifying stable version with `--required-version` (#2832).
- Avoid crashing when the user has no homedir (#2814)
- Avoid crashing when md5 is not available (#2905)
- Fix handling of directory junctions on Windows (#2904)
### Documentation
- Update pylint config documentation (#2931)
### Integrations
- Move test to disable plugin in Vim/Neovim, which speeds up loading (#2896)
### Output
- In verbose, mode, log when _Black_ is using user-level config (#2861)
### Packaging
- Fix Black to work with Click 8.1.0 (#2966)
- On Python 3.11 and newer, use the standard library's `tomllib` instead of `tomli`
(#2903)
- `black-primer`, the deprecated internal devtool, has been removed and copied to a
[separate repository](https://github.com/cooperlees/black-primer) (#2924)
### Parser
- Black can now parse starred expressions in the target of `for` and `async for`
statements, e.g `for item in *items_1, *items_2: pass` (#2879).
## 22.1.0
At long last, _Black_ is no longer a beta product! This is the first non-beta release
and the first release covered by our new
[stability policy](https://black.readthedocs.io/en/stable/the_black_code_style/index.html#stability-policy).
### Highlights
- **Remove Python 2 support** (#2740)
- Introduce the `--preview` flag (#2752)
### Style
- Deprecate `--experimental-string-processing` and move the functionality under
`--preview` (#2789)
- For stubs, one blank line between class attributes and methods is now kept if there's
at least one pre-existing blank line (#2736)
- Black now normalizes string prefix order (#2297)
- Remove spaces around power operators if both operands are simple (#2726)
- Work around bug that causes unstable formatting in some cases in the presence of the
magic trailing comma (#2807)
- Use parentheses for attribute access on decimal float and int literals (#2799)
- Don't add whitespace for attribute access on hexadecimal, binary, octal, and complex
literals (#2799)
- Treat blank lines in stubs the same inside top-level `if` statements (#2820)
- Fix unstable formatting with semicolons and arithmetic expressions (#2817)
- Fix unstable formatting around magic trailing comma (#2572)
### Parser
- Fix mapping cases that contain as-expressions, like `case {"key": 1 | 2 as password}`
(#2686)
- Fix cases that contain multiple top-level as-expressions, like `case 1 as a, 2 as b`
(#2716)
- Fix call patterns that contain as-expressions with keyword arguments, like
`case Foo(bar=baz as quux)` (#2749)
- Tuple unpacking on `return` and `yield` constructs now implies 3.8+ (#2700)
- Unparenthesized tuples on annotated assignments (e.g
`values: Tuple[int, ...] = 1, 2, 3`) now implies 3.8+ (#2708)
- Fix handling of standalone `match()` or `case()` when there is a trailing newline or a
comment inside of the parentheses. (#2760)
- `from __future__ import annotations` statement now implies Python 3.7+ (#2690)
### Performance
- Speed-up the new backtracking parser about 4X in general (enabled when
`--target-version` is set to 3.10 and higher). (#2728)
- _Black_ is now compiled with [mypyc](https://github.com/mypyc/mypyc) for an overall 2x
speed-up. 64-bit Windows, MacOS, and Linux (not including musl) are supported. (#1009,
#2431)
### Configuration
- Do not accept bare carriage return line endings in pyproject.toml (#2408)
- Add configuration option (`python-cell-magics`) to format cells with custom magics in
Jupyter Notebooks (#2744)
- Allow setting custom cache directory on all platforms with environment variable
`BLACK_CACHE_DIR` (#2739).
- Enable Python 3.10+ by default, without any extra need to specify
`--target-version=py310`. (#2758)
- Make passing `SRC` or `--code` mandatory and mutually exclusive (#2804)
### Output
- Improve error message for invalid regular expression (#2678)
- Improve error message when parsing fails during AST safety check by embedding the
underlying SyntaxError (#2693)
- No longer color diff headers white as it's unreadable in light themed terminals
(#2691)
- Text coloring added in the final statistics (#2712)
- Verbose mode also now describes how a project root was discovered and which paths will
be formatted. (#2526)
### Packaging
- All upper version bounds on dependencies have been removed (#2718)
- `typing-extensions` is no longer a required dependency in Python 3.10+ (#2772)
- Set `click` lower bound to `8.0.0` (#2791)
### Integrations
- Update GitHub action to support containerized runs (#2748)
### Documentation
- Change protocol in pip installation instructions to `https://` (#2761)
- Change HTML theme to Furo primarily for its responsive design and mobile support
(#2793)
- Deprecate the `black-primer` tool (#2809)
- Document Python support policy (#2819)
## 21.12b0
### _Black_
- Fix determination of f-string expression spans (#2654)
- Fix bad formatting of error messages about EOF in multi-line statements (#2343)
- Functions and classes in blocks now have more consistent surrounding spacing (#2472)
#### Jupyter Notebook support
- Cell magics are now only processed if they are known Python cell magics. Earlier, all
cell magics were tokenized, leading to possible indentation errors e.g. with
`%%writefile`. (#2630)
- Fix assignment to environment variables in Jupyter Notebooks (#2642)
#### Python 3.10 support
- Point users to using `--target-version py310` if we detect 3.10-only syntax (#2668)
- Fix `match` statements with open sequence subjects, like `match a, b:` or
`match a, *b:` (#2639) (#2659)
- Fix `match`/`case` statements that contain `match`/`case` soft keywords multiple
times, like `match re.match()` (#2661)
- Fix `case` statements with an inline body (#2665)
- Fix styling of starred expressions inside `match` subject (#2667)
- Fix parser error location on invalid syntax in a `match` statement (#2649)
- Fix Python 3.10 support on platforms without ProcessPoolExecutor (#2631)
- Improve parsing performance on code that uses `match` under `--target-version py310`
up to ~50% (#2670)
### Packaging
- Remove dependency on `regex` (#2644) (#2663)
## 21.11b1
### _Black_
- Bumped regex version minimum to 2021.4.4 to fix Pattern class usage (#2621)
## 21.11b0
### _Black_
- Warn about Python 2 deprecation in more cases by improving Python 2 only syntax
detection (#2592)
- Add experimental PyPy support (#2559)
- Add partial support for the match statement. As it's experimental, it's only enabled
when `--target-version py310` is explicitly specified (#2586)
- Add support for parenthesized with (#2586)
- Declare support for Python 3.10 for running Black (#2562)
### Integrations
- Fixed vim plugin with Python 3.10 by removing deprecated distutils import (#2610)
- The vim plugin now parses `skip_magic_trailing_comma` from pyproject.toml (#2613)
## 21.10b0
### _Black_
- Document stability policy, that will apply for non-beta releases (#2529)
- Add new `--workers` parameter (#2514)
- Fixed feature detection for positional-only arguments in lambdas (#2532)
- Bumped typed-ast version minimum to 1.4.3 for 3.10 compatibility (#2519)
- Fixed a Python 3.10 compatibility issue where the loop argument was still being passed
even though it has been removed (#2580)
- Deprecate Python 2 formatting support (#2523)
### _Blackd_
- Remove dependency on aiohttp-cors (#2500)
- Bump required aiohttp version to 3.7.4 (#2509)
### _Black-Primer_
- Add primer support for --projects (#2555)
- Print primer summary after individual failures (#2570)
### Integrations
- Allow to pass `target_version` in the vim plugin (#1319)
- Install build tools in docker file and use multi-stage build to keep the image size
down (#2582)
## 21.9b0
### Packaging
- Fix missing modules in self-contained binaries (#2466)
- Fix missing toml extra used during installation (#2475)
## 21.8b0
### _Black_
- Add support for formatting Jupyter Notebook files (#2357)
- Move from `appdirs` dependency to `platformdirs` (#2375)
- Present a more user-friendly error if .gitignore is invalid (#2414)
- The failsafe for accidentally added backslashes in f-string expressions has been
hardened to handle more edge cases during quote normalization (#2437)
- Avoid changing a function return type annotation's type to a tuple by adding a
trailing comma (#2384)
- Parsing support has been added for unparenthesized walruses in set literals, set
comprehensions, and indices (#2447).
- Pin `setuptools-scm` build-time dependency version (#2457)
- Exclude typing-extensions version 3.10.0.1 due to it being broken on Python 3.10
(#2460)
### _Blackd_
- Replace sys.exit(-1) with raise ImportError as it plays more nicely with tools that
scan installed packages (#2440)
### Integrations
- The provided pre-commit hooks no longer specify `language_version` to avoid overriding
`default_language_version` (#2430)
## 21.7b0
### _Black_
- Configuration files using TOML features higher than spec v0.5.0 are now supported
(#2301)
- Add primer support and test for code piped into black via STDIN (#2315)
- Fix internal error when `FORCE_OPTIONAL_PARENTHESES` feature is enabled (#2332)
- Accept empty stdin (#2346)
- Provide a more useful error when parsing fails during AST safety checks (#2304)
### Docker
- Add new `latest_release` tag automation to follow latest black release on docker
images (#2374)
### Integrations
- The vim plugin now searches upwards from the directory containing the current buffer
instead of the current working directory for pyproject.toml. (#1871)
- The vim plugin now reads the correct string normalization option in pyproject.toml
(#1869)
- The vim plugin no longer crashes Black when there's boolean values in pyproject.toml
(#1869)
## 21.6b0
### _Black_
- Fix failure caused by `fmt: skip` and indentation (#2281)
- Account for += assignment when deciding whether to split string (#2312)
- Correct max string length calculation when there are string operators (#2292)
- Fixed option usage when using the `--code` flag (#2259)
- Do not call `uvloop.install()` when _Black_ is used as a library (#2303)
- Added `--required-version` option to require a specific version to be running (#2300)
- Fix incorrect custom breakpoint indices when string group contains fake f-strings
(#2311)
- Fix regression where `R` prefixes would be lowercased for docstrings (#2285)
- Fix handling of named escapes (`\N{...}`) when `--experimental-string-processing` is
used (#2319)
### Integrations
- The official Black action now supports choosing what version to use, and supports the
major 3 OSes. (#1940)
## 21.5b2
### _Black_
- A space is no longer inserted into empty docstrings (#2249)
- Fix handling of .gitignore files containing non-ASCII characters on Windows (#2229)
- Respect `.gitignore` files in all levels, not only `root/.gitignore` file (apply
`.gitignore` rules like `git` does) (#2225)
- Restored compatibility with Click 8.0 on Python 3.6 when LANG=C used (#2227)
- Add extra uvloop install + import support if in python env (#2258)
- Fix --experimental-string-processing crash when matching parens are not found (#2283)
- Make sure to split lines that start with a string operator (#2286)
- Fix regular expression that black uses to identify f-expressions (#2287)
### _Blackd_
- Add a lower bound for the `aiohttp-cors` dependency. Only 0.4.0 or higher is
supported. (#2231)
### Packaging
- Release self-contained x86_64 MacOS binaries as part of the GitHub release pipeline
(#2198)
- Always build binaries with the latest available Python (#2260)
### Documentation
- Add discussion of magic comments to FAQ page (#2272)
- `--experimental-string-processing` will be enabled by default in the future (#2273)
- Fix typos discovered by codespell (#2228)
- Fix Vim plugin installation instructions. (#2235)
- Add new Frequently Asked Questions page (#2247)
- Fix encoding + symlink issues preventing proper build on Windows (#2262)
## 21.5b1
### _Black_
- Refactor `src/black/__init__.py` into many files (#2206)
### Documentation
- Replaced all remaining references to the
[`master`](https://github.com/psf/black/tree/main) branch with the
[`main`](https://github.com/psf/black/tree/main) branch. Some additional changes in
the source code were also made. (#2210)
- Sigificantly reorganized the documentation to make much more sense. Check them out by
heading over to [the stable docs on RTD](https://black.readthedocs.io/en/stable/).
(#2174)
## 21.5b0
### _Black_
- Set `--pyi` mode if `--stdin-filename` ends in `.pyi` (#2169)
- Stop detecting target version as Python 3.9+ with pre-PEP-614 decorators that are
being called but with no arguments (#2182)
### _Black-Primer_
- Add `--no-diff` to black-primer to suppress formatting changes (#2187)
## 21.4b2
### _Black_
- Fix crash if the user configuration directory is inaccessible. (#2158)
- Clarify
[circumstances](https://github.com/psf/black/blob/master/docs/the_black_code_style.md#pragmatism)
in which _Black_ may change the AST (#2159)
- Allow `.gitignore` rules to be overridden by specifying `exclude` in `pyproject.toml`
or on the command line. (#2170)
### _Packaging_
- Install `primer.json` (used by `black-primer` by default) with black. (#2154)
## 21.4b1
### _Black_
- Fix crash on docstrings ending with "\\ ". (#2142)
- Fix crash when atypical whitespace is cleaned out of dostrings (#2120)
- Reflect the `--skip-magic-trailing-comma` and `--experimental-string-processing` flags
in the name of the cache file. Without this fix, changes in these flags would not take
effect if the cache had already been populated. (#2131)
- Don't remove necessary parentheses from assignment expression containing assert /
return statements. (#2143)
### _Packaging_
- Bump pathspec to >= 0.8.1 to solve invalid .gitignore exclusion handling
## 21.4b0
### _Black_
- Fixed a rare but annoying formatting instability created by the combination of
optional trailing commas inserted by `Black` and optional parentheses looking at
pre-existing "magic" trailing commas. This fixes issue #1629 and all of its many many
duplicates. (#2126)
- `Black` now processes one-line docstrings by stripping leading and trailing spaces,
and adding a padding space when needed to break up """". (#1740)
- `Black` now cleans up leading non-breaking spaces in comments (#2092)
- `Black` now respects `--skip-string-normalization` when normalizing multiline
docstring quotes (#1637)
- `Black` no longer removes all empty lines between non-function code and decorators
when formatting typing stubs. Now `Black` enforces a single empty line. (#1646)
- `Black` no longer adds an incorrect space after a parenthesized assignment expression
in if/while statements (#1655)
- Added `--skip-magic-trailing-comma` / `-C` to avoid using trailing commas as a reason
to split lines (#1824)
- fixed a crash when PWD=/ on POSIX (#1631)
- fixed "I/O operation on closed file" when using --diff (#1664)
- Prevent coloured diff output being interleaved with multiple files (#1673)
- Added support for PEP 614 relaxed decorator syntax on python 3.9 (#1711)
- Added parsing support for unparenthesized tuples and yield expressions in annotated
assignments (#1835)
- added `--extend-exclude` argument (PR #2005)
- speed up caching by avoiding pathlib (#1950)
- `--diff` correctly indicates when a file doesn't end in a newline (#1662)
- Added `--stdin-filename` argument to allow stdin to respect `--force-exclude` rules
(#1780)
- Lines ending with `fmt: skip` will now be not formatted (#1800)
- PR #2053: Black no longer relies on typed-ast for Python 3.8 and higher
- PR #2053: Python 2 support is now optional, install with
`python3 -m pip install black[python2]` to maintain support.
- Exclude `venv` directory by default (#1683)
- Fixed "Black produced code that is not equivalent to the source" when formatting
Python 2 docstrings (#2037)
### _Packaging_
- Self-contained native _Black_ binaries are now provided for releases via GitHub
Releases (#1743)
## 20.8b1
### _Packaging_
- explicitly depend on Click 7.1.2 or newer as `Black` no longer works with versions
older than 7.0
## 20.8b0
### _Black_
- re-implemented support for explicit trailing commas: now it works consistently within
any bracket pair, including nested structures (#1288 and duplicates)
- `Black` now reindents docstrings when reindenting code around it (#1053)
- `Black` now shows colored diffs (#1266)
- `Black` is now packaged using 'py3' tagged wheels (#1388)
- `Black` now supports Python 3.8 code, e.g. star expressions in return statements
(#1121)
- `Black` no longer normalizes capital R-string prefixes as those have a
community-accepted meaning (#1244)
- `Black` now uses exit code 2 when specified configuration file doesn't exit (#1361)
- `Black` now works on AWS Lambda (#1141)
- added `--force-exclude` argument (#1032)
- removed deprecated `--py36` option (#1236)
- fixed `--diff` output when EOF is encountered (#526)
- fixed `# fmt: off` handling around decorators (#560)
- fixed unstable formatting with some `# type: ignore` comments (#1113)
- fixed invalid removal on organizing brackets followed by indexing (#1575)
- introduced `black-primer`, a CI tool that allows us to run regression tests against
existing open source users of Black (#1402)
- introduced property-based fuzzing to our test suite based on Hypothesis and
Hypothersmith (#1566)
- implemented experimental and disabled by default long string rewrapping (#1132),
hidden under a `--experimental-string-processing` flag while it's being worked on;
this is an undocumented and unsupported feature, you lose Internet points for
depending on it (#1609)
### Vim plugin
- prefer virtualenv packages over global packages (#1383)
## 19.10b0
- added support for PEP 572 assignment expressions (#711)
- added support for PEP 570 positional-only arguments (#943)
- added support for async generators (#593)
- added support for pre-splitting collections by putting an explicit trailing comma
inside (#826)
- added `black -c` as a way to format code passed from the command line (#761)
- --safe now works with Python 2 code (#840)
- fixed grammar selection for Python 2-specific code (#765)
- fixed feature detection for trailing commas in function definitions and call sites
(#763)
- `# fmt: off`/`# fmt: on` comment pairs placed multiple times within the same block of
code now behave correctly (#1005)
- _Black_ no longer crashes on Windows machines with more than 61 cores (#838)
- _Black_ no longer crashes on standalone comments prepended with a backslash (#767)
- _Black_ no longer crashes on `from` ... `import` blocks with comments (#829)
- _Black_ no longer crashes on Python 3.7 on some platform configurations (#494)
- _Black_ no longer fails on comments in from-imports (#671)
- _Black_ no longer fails when the file starts with a backslash (#922)
- _Black_ no longer merges regular comments with type comments (#1027)
- _Black_ no longer splits long lines that contain type comments (#997)
- removed unnecessary parentheses around `yield` expressions (#834)
- added parentheses around long tuples in unpacking assignments (#832)
- added parentheses around complex powers when they are prefixed by a unary operator
(#646)
- fixed bug that led _Black_ format some code with a line length target of 1 (#762)
- _Black_ no longer introduces quotes in f-string subexpressions on string boundaries
(#863)
- if _Black_ puts parenthesis around a single expression, it moves comments to the
wrapped expression instead of after the brackets (#872)
- `blackd` now returns the version of _Black_ in the response headers (#1013)
- `blackd` can now output the diff of formats on source code when the `X-Diff` header is
provided (#969)
## 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](https://github.com/psf/black/blob/18.9b0/README.md#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://www.spyder-ide.org/) 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)
- 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)
- parentheses are now also managed automatically on the right-hand side of assignments
and return statements (#140)
- math operators now use their respective priorities for delimiting multiline
expressions (#148)
- optional parentheses are now omitted on expressions that start or end with a bracket
and only contain a single operator (#177)
- empty parentheses in a class definition are now removed (#145, #180)
- string prefixes are now standardized to lowercase and `u` is removed on Python 3.6+
only code and Python 2.7+ code with the `unicode_literals` future import (#188, #198,
#199)
- typing stub files (`.pyi`) are now formatted in a style that is consistent with PEP
484 (#207, #210)
- progress when reformatting many files is now reported incrementally
- fixed trailers (content with brackets) being unnecessarily exploded into their own
lines after a dedented closing bracket (#119)
- fixed an invalid trailing comma sometimes left in imports (#185)
- fixed non-deterministic formatting when multiple pairs of removable parentheses were
used (#183)
- fixed multiline strings being unnecessarily wrapped in optional parentheses in long
assignments (#215)
- fixed not splitting long from-imports with only a single name
- fixed Python 3.6+ file discovery by also looking at function calls with unpacking.
This fixed non-deterministic formatting if trailing commas where used both in function
signatures with stars and function calls with stars but the former would be
reformatted to a single line.
- fixed crash on dealing with optional parentheses (#193)
- fixed "is", "is not", "in", and "not in" not considered operators for splitting
purposes
- fixed crash when dead symlinks where encountered
## 18.4a4
- don't populate the cache on `--check` (#175)
## 18.4a3
- 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)
- _Black_ no longer enforces putting empty lines behind control flow statements (#90)
- _Black_ now splits imports like "Mode 3 + trailing comma" of isort (#127)
- fixed comment indentation when a standalone comment closes a block (#16, #32)
- fixed standalone comments receiving extra empty lines if immediately preceding a
class, def, or decorator (#56, #154)
- fixed `--diff` not showing entire path (#130)
- fixed parsing of complex expressions after star and double stars in function calls
(#2)
- fixed invalid splitting on comma in lambda arguments (#133)
- fixed missing splits of ternary expressions (#141)
## 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)
## 18.3a3
- don't remove single empty lines outside of bracketed expressions (#19)
- added ability to pipe formatting from stdin to stdin (#25)
- restored ability to format code with legacy usage of `async` as a name (#20, #42)
- even better handling of numpy-style array indexing (#33, again)
## 18.3a2
- changed positioning of binary operators to occur at beginning of lines 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 looking
formattings (#34, #35)
- remove a trailing comma if there is a single argument to a call
- if top level functions were separated by a comment, don't put four empty lines after
the upper function
- fixed unstable formatting of newlines with imports
- fixed unintentional folding of post scriptum standalone comments into last statement
if it was a simple statement (#18, #28)
- fixed missing space in numpy-style array indexing (#33)
- fixed spurious space after star-based unary expressions (#31)
## 18.3a1
- added `--check`
- 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)
- fixed invalid spacing of dots in relative imports (#6, #13)
- fixed invalid splitting after comma on unpacked variables in for-loops (#23)
- fixed spurious space in parenthesized set expressions (#7)
- fixed spurious space after opening parentheses and in default arguments (#14, #17)
- fixed spurious space after unary operators when the operand was a complex expression
(#15)
## 18.3a0
- first published version, Happy 🍰 Day 2018!
- alpha quality
- date-versioned (see: <https://calver.org/>)
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