relnotes/v0.34.0.md
Apart from the usual myriad of bugfixes, improvements and new cops,
this version introduces a results caching functionality. This
functionality will speed up tremendously consecutive RuboCop runs on
the same codebase.
Another news to share with you - the project now has a crowdfunding
campaign [here](https://salt.bountysource.com/teams/rubocop). If you like RuboCop
you might consider supporting its development.
Enjoy!
### New features
* [#2143](https://github.com/rubocop/rubocop/pull/2143): New cop `Performance/CaseWhenSplat` will identify and rearrange `case` `when` statements that contain a `when` condition with a splat. ([@rrosenblum][])
* New cop `Lint/DuplicatedKey` checks for duplicated keys in hashes, which Ruby 2.2 warns against. ([@sliuu][])
* [#2106](https://github.com/rubocop/rubocop/issues/2106): Add `SuspiciousParamNames` option to `Style/OptionHash`. ([@wli][])
* [#2193](https://github.com/rubocop/rubocop/pull/2193): `Style/Next` supports more `Enumerable` methods. ([@rrosenblum][])
* [#2179](https://github.com/rubocop/rubocop/issues/2179): Add `--list-target-files` option to CLI, which prints the files which will be inspected. ([@maxjacobson][])
* New cop `Style/MutableConstant` checks for assignment of mutable objects to constants. ([@bbatsov][])
* New cop `Style/RedundantFreeze` checks for usages of `Object#freeze` on immutable objects. ([@bbatsov][])
* [#1924](https://github.com/rubocop/rubocop/issues/1924): New option `--cache` and configuration parameter `AllCops: UseCache` turn result caching on (default) or off. ([@jonas054][])
* [#2204](https://github.com/rubocop/rubocop/pull/2204): New cop `Style/StringMethods` will check for preferred method `to_sym` over `intern`. ([@imtayadeway][])
### Changes
* [#1351](https://github.com/rubocop/rubocop/issues/1351): Allow class emitter methods in `Style/MethodName`. ([@jonas054][])
* [#2126](https://github.com/rubocop/rubocop/pull/2126): `Style/RescueModifier` can now auto-correct. ([@rrosenblum][])
* [#2109](https://github.com/rubocop/rubocop/issues/2109): Allow alignment with a token on the nearest line with same indentation in `Style/ExtraSpacing`. ([@jonas054][])
* `Lint/EndAlignment` handles the `case` keyword. ([@lumeet][])
* [#2146](https://github.com/rubocop/rubocop/pull/2146): Add STDIN support. ([@caseywebdev][])
* [#2175](https://github.com/rubocop/rubocop/pull/2175): Files that are excluded from a cop (e.g. using the `Exclude:` config option) are no longer being processed by that cop. ([@bquorning][])
* `Rails/ActionFilter` now handles complete list of methods found in the Rails 4.2 [release notes](https://github.com/rails/rails/blob/4115a12da1409c753c747fd4bab6e612c0c6e51a/guides/source/4_2_release_notes.md#notable-changes-1). ([@MGerrior][])
* [*2138](https://github.com/rubocop/rubocop/issues/2138): Change the offense in `Style/Next` to highlight the condition instead of the iteration. ([@rrosenblum][])
* `Style/EmptyLineBetweenDefs` now handles class methods as well. ([@unmanbearpig][])
* Improve handling of `super` in `Style/SymbolProc`. ([@lumeet][])
* `Style/SymbolProc` is applied to methods receiving arguments. ([@lumeet][])
* [#1839](https://github.com/rubocop/rubocop/issues/1839): Remove Rainbow monkey patching of String which conflicts with other gems like colorize. ([@daviddavis][])
* `Style/HashSyntax` is now a bit faster when checking Ruby 1.9 syntax hash keys. ([@bquorning][])
* `Lint/DeprecatedClassMethods` is now a whole lot faster. ([@bquorning][])
* `Lint/BlockAlignment`, `Style/IndentationWidth`, and `Style/MultilineOperationIndentation` are now quite a bit faster. ([@bquorning][])
### Bug Fixes
* [#2123](https://github.com/rubocop/rubocop/pull/2123): Fix handing of dynamic widths `Lint/FormatParameterMismatch`. ([@edmz][])
* [#2116](https://github.com/rubocop/rubocop/pull/2116): Fix named params (using hash) `Lint/FormatParameterMismatch`. ([@edmz][])
* [#2135](https://github.com/rubocop/rubocop/issues/2135): Ignore `super` and `zsuper` nodes in `Style/SymbolProc`. ([@bbatsov][])
* [#2165](https://github.com/rubocop/rubocop/issues/2165): Fix a NPE in `Style/Alias`. ([@bbatsov][])
* [#2168](https://github.com/rubocop/rubocop/issues/2168): Fix a NPE in `Rails/TimeZone`. ([@bbatsov][])
* [#2169](https://github.com/rubocop/rubocop/issues/2169): Fix a NPE in `Rails/Date`. ([@bbatsov][])
* [#2105](https://github.com/rubocop/rubocop/pull/2105): Fix a warning that was thrown when enabling `Style/OptionHash`. ([@wli][])
* [#2107](https://github.com/rubocop/rubocop/pull/2107): Fix auto-correct of `Style/ParallelAssignment` for nested expressions. ([@rrosenblum][])
* [#2111](https://github.com/rubocop/rubocop/issues/2111): Deal with byte order mark in `Style/InitialIndentation`. ([@jonas054][])
* [#2113](https://github.com/rubocop/rubocop/issues/2113): Handle non-string tokens in `Style/ExtraSpacing`. ([@jonas054][])
* [#2129](https://github.com/rubocop/rubocop/issues/2129): Handle empty interpolations in `Style/SpaceInsideStringInterpolation`. ([@lumeet][])
* [#2119](https://github.com/rubocop/rubocop/issues/2119): Do not raise an error in `Style/RescueEnsureAlignment` and `Style/RescueModifier` when processing an excluded file. ([@rrosenblum][])
* [#2149](https://github.com/rubocop/rubocop/issues/2149): Do not register an offense in `Rails/Date` when `Date#to_time` is called with a time zone argument. ([@maxjacobson][])
* Do not register a `Rails/TimeZone` offense when using Time.new safely. ([@maxjacobson][])
* [#2124](https://github.com/rubocop/rubocop/issues/2124): Fix bug in `Style/EmptyLineBetweenDefs` when there are only comments between method definitions. ([@lumeet][])
* [#2154](https://github.com/rubocop/rubocop/issues/2154): `Performance/StringReplacement` can auto-correct replacements with backslash in them. ([@rrosenblum][])
* [#2009](https://github.com/rubocop/rubocop/issues/2009): Fix bug in `RuboCop::ConfigLoader.load_file` when `safe_yaml` is required. ([@eitoball][])
* [#2155](https://github.com/rubocop/rubocop/issues/2155): Configuration `EndAlignment: AlignWith: variable` only applies when the operands of `=` are on the same line. ([@jonas054][])
* Fix bug in `Style/IndentationWidth` when `rescue` or `ensure` is preceded by an empty body. ([@lumeet][])
* [#2183](https://github.com/rubocop/rubocop/issues/2183): Fix bug in `Style/BlockDelimiters` when auto-correcting adjacent braces. ([@lumeet][])
* [#2199](https://github.com/rubocop/rubocop/issues/2199): Make `rubocop` exit with error when there are only `Lint/UnneededDisable` offenses. ([@jonas054][])
* Fix handling of empty parentheses when auto-correcting in `Style/SymbolProc`. ([@lumeet][])
[@bbatsov]: https://github.com/bbatsov
[@jonas054]: https://github.com/jonas054
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[@Koronen]: https://github.com/Koronen
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[@unmanbearpig]: https://github.com/unmanbearpig
[@maxjacobson]: https://github.com/maxjacobson
[@sliuu]: https://github.com/sliuu
[@edmz]: https://github.com/edmz
[@syndbg]: https://github.com/syndbg
[@wli]: https://github.com/wli
[@caseywebdev]: https://github.com/caseywebdev
[@MGerrior]: https://github.com/MGerrior
[@imtayadeway]: https://github.com/imtayadeway