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black/docs/change_log.md
Richard Si 1d2d7264ec
Fix incorrect space before colon in if/while stmts (#1655) 
* Fix incorrect space before colon in if/while stmts

Previously Black would format this code

```
if (foo := True):
	print(foo)
```

as

```
if (foo := True) :
	print(foo)
```

adding an incorrect space after the RPAR. Buggy code in the
normalize_invisible_parens function caused the colon to be wrapped in
invisible parentheses. The LPAR of that pair was then prefixed with a
single space at the request of the whitespace function.

This commit fixes the accidental skipping of a pre-condition check
which must return True before parenthesis normalization of a specific
child Leaf or Node can happen. The pre-condition check being skipped
was why the colon was wrapped in invisible parentheses.

* Add an entry in CHANGES.md
2020-08-31 14:20:05 -07:00

516 lines
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[//]: # "NOTE: THIS FILE WAS AUTOGENERATED FROM CHANGES.md"
## Change Log
### Unreleased
#### _Black_
- `Black` now respects `--skip-string-normalization` when normalizing multiline
docstring quotes (#1637)
- `Black` no longer adds an incorrect space after a parenthesized assignment expression
in if/while statements (#1655)
- fixed a crash when PWD=/ on POSIX (#1631)
### 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](#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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