Changelog

All notable changes to this project will be documented in this file.
This project adheres to Semantic Versioning.

Unreleased

Added

Fixed

Incorrect indentation with multiple interfaces (#1003)
Empty line before primary constructor is not reported and formatted-out (#1004)
Fix '.editorconfig' generation for "import-ordering" rule (#1011)
Fix "filename" rule will not work when '.editorconfig' file is not found (#997)
EditorConfig generation for import-ordering (#1011)
Internal error (no-unused-imports) (#996)
Fix false positive when argument list is after multiline dot-qualified expression (argument-list-wrapping) (#893)
Fix indentation for function types after a newline (indent) (#918)
Don't remove the equals sign for a default argument (no-line-break-before-assignment) (#1039)
Fix internal error in no-unused-imports (#1040)
Fix false positives when declaration has tail comments (spacing-between-declarations-with-comments) (#1053)
Fix false positive after else keyword (argument-list-wrapping) (#1047)
Fix formatting with comments (colon-spacing) (#1057)
Fix IndexOutOfBoundsException in argument-list-wrapping-rule formatting file with many corrections (#1081)
Fix formatting in arguments (multiline-if-else) (#1079)
Fix experimental:annotation-spacing-rule autocorrection with comments
Migrate from klob dependency and fix negated globs passed to CLI are no longer worked (#999) Breaking: absolute paths globs will no longer work, check updated README

Changed

Update Gradle shadow plugin to 6.1.0 version
Align with Kotlin plugin on how alias pattern is represented for imports layout rule (#753)
Align with Kotlin plugin on how subpackages are represented (#753)
Deprecated custom kotlin_imports_layout EditorConfig property. Please use ij_kotlin_imports_layout to ensure that the Kotlin IDE plugin and ktlint use same imports layout (#753)
Deprecated idea and ascii shortcuts as the ij_kotlin_imports_layout property does not support those. Please check README on how to achieve those with patterns (#753)
Update Gradle to 6.8.1 version
Update Kotlin to 1.4.30 version. Fixes #1063.

Removed

0.40.0 - 2020-12-04

Special thanks to t-kameyama for the huge number of bugfixes in this release!

Added

Initial implementation IDE integration via '.editorconfig' based on rules default values (#701)
CLI subcommand generateEditorConfig to generate '.editorconfig' content for Kotlin files (#701)
A new capability to generate baseline and run ktlint against it with --baseline cli option (#707)

Fixed

Do not report when semicolon is before annotation/comment/kdoc and lambda (#825)
Fix false positive when import directive has backticks and alias (#910)
@receiver annotations with parameters are not required to be on a separate line (#885)
Fix false positive "File annotations should be separated from file contents with a blank line" in kts files (#914)
Fix false positive Missing newline after "->" when when entry has a nested if/else block (#901)
Allow an inline block comment in argument-list-wrapping (#926)
Fix false positive for line-breaks inside lambdas in argument-list-wrapping (#861) (#870)
Fix wrong indentation inside an if-condition in argument-list-wrapping (#854) (#864)
Fix false positive for method after string template in argument-list-wrapping (#842) (#859)
Fix false positive when a comment is not between declarations in spacing-between-declarations-with-comments(#865)
Fix formatting with comments (multiline-if-else) (#944)
Do not insert unnecessary spacings inside multiline if-else condition (indent) (#871) (#900)
Correctly indent primary constructor parameters when class has multiline type parameter (parameter-list-wrapping) (#921) (#938)
Correctly indent property delegates (indent) (#939)
Fix false positive for semicolon between empty enum entry and member (no-semicolons) (#957)
Fix wrong indentation for class delegates (indent) (#960) (#963) (#877)
Fix wrong indentation in named arguments (indent) (#964)
Fix wrong indentation when a function has multiline type arguments (parameter-list-wrapping) (#965)
Fix false positive for spacing-between-declarations-with-annotations (#970)
Fix ParseException when an assigment contains comments (no-line-break-before-assignment) (#956)
Fix false positive when right brace is after a try-catch block (spacing-around-keyword) (#978)
Fix false positive for control flow with empty body (no-semicolons) (#955)
Fix incorrect indentation for multi-line call expressions in conditions (indent) (#959)
Fix false positive for trailing comma before right parentheses|bracket|angle (spacing-around-comma) (#975)
Fix ktlint CLI could skip checking some of explicetly passed files (#942)

Changed

'import-ordering' now supports `.editorconfig' default value generation (#701)
Update Gradle to 6.7.1 version

0.39.0 - 2020-09-14

Added

Add new applyToIDEA location for IDEA 2020.1.x and above on MacOs
Debug output: print loaded .editorconfig content
Extract argument-list-wrapping rule into experimental ruleset
Split annotation-spacing into separate experimental rule

Fixed

Do not enforce raw strings opening quote to be on a separate line (#711)
False negative with multiline type parameter list in function signature for parameter-list-wrapping(#680)
Alternative .editorconfig path is ignored on stdin input (#869)
False positive with semicolons before annotations/comments/kdoc (#825)
Do not report when string-template expression is a keyword (#883)
False positive for subclass imports in no-unused-imports (#845)
False positive for static java function imports in no-unused-imports (#872)
Missing signature for KtLint CLI artifact published to Github release (#895)
Crash in annotation rule (#868)
False-positive unused import violation (#902)

Changed

Ktlint object internal code cleanup
Deprecate some of public methods in Ktlint object that should not be exposed as public api
Update Kotlin to 1.4.10 version
Make RuleSet class open so it can be inherited

0.38.1 - 2020-08-24

Minor release to support projects using mixed 1.3/1.4 Kotlin versions (e.g. Gradle plugins)

Changed

Compile with apiLevel = 1.3

0.38.0 - 2020-08-21

New release with Kotlin 1.4.0 support and several enhancements and bugfixes.

Added

Experimental SpacingAroundAngleBracketsRule (#769)
Checksum generation for executable Jar (#695)
Enable Gradle dependency verification
parameter-list-wrapping rule now also considers function arguments while wrapping (#620)
Publish snapshots built against kotlin development versions
Initial support for tab-based indentation (#128)

Fixed

Safe-called wrapped trailing lambdas indented correctly (#776)
provideDelegate imports are not marked as unused anymore (#669)
Set continuation indent to 4 in IDE integration codestyle (#775)
No empty lines between annotation and annotated target (#688)
Unused imports reported correctly (#526) (#405)
No false empty lines inserted in multiline if-else block (#793)
No-wildcard-imports properly handles custom infix function with asterisk (#799)
Do not require else to be in the same line of a right brace if the right brace is not part of the if statement (#756)
Brace-less if-else bodies starting with parens indented correctly (#829)
If-condition with multiline call expression inside indented correctly (#796)

Changed

Update Gradle to 6.6 version
Update ec4j to 0.2.2 version. Now it should report path to .editorconfig file on failed parsing and allow empty .editorconfig files.
Update Kotlin to 1.4.0 version (#830)

0.37.2 - 2020-06-16

Minor release to fix further bugs in ImportOrderingRule.

Fixed

Imports with aliases no longer removed (#766)

0.37.1 - 2020-06-08

Minor release to fix some bugs in the 0.37.0 release.

Fixed

Invalid path exception error on Windows machines when loading properties from .editorconfig (#761)
Imports with as no longer removed (#766)
The contents of raw strings are no longer modified by the indent rule (#682)

0.37.0 - 2020-06-02

Thank you to Tapchicoma and romtsn for all their hard work on this release!

Added

Gradle wrapper validation (#684)
Experimental SpacingAroundDoubleColon rule (#722]
Experimental SpacingBetweenDeclarationsWithCommentsRule and SpacingBetweenDeclarationsWithAnnotationsRule. Fixes ([#721]pinterest#721)
kotlin_imports_layout config for .editorconfig file so that import ordering is configurable. Fixes (#527)

Changed

Kotlin was updated to 1.3.70 version
Loading properties from .editorconfig was fully delegated to ec4j library. This fixes ability to override properties for specific files/directories (#742)
Promote experimental "indent" rule to standard one, old standard "indent" rule is removed
Functions to calculate line/column are now public so they can be used by 3rd party tools (#725)
AnnotationRule now handles file annotations as well (#714)

Fixed

Ignore keywords in KDoc comments (#671)
Allow multiple spaces in KDoc comments (#706)
Trailing comment no longer reported as incorrect indentation (#710]
Annotated function types no longer reported as an error (#737)
FinalNewlineRule no longer reports error for empty files (#723)
EOL comments will no longer cause AnnotationRule to report an error (#736)
Formatter will no longer break class declaration with trailing comment (#728)
Formatting for single line if/else statements (#174)
Exception in NoLineBreakBeforeAssignmentRule (#693)

Removed

Removed Maven; builds all run under Gradle (#445)
Old standard IndentRule

0.36.0 - 2019-12-03

Added

HTML reporter (#641)
Experimental rule to lint enum entry names (#638)
@Suppress("RemoveCurlyBracesFromTemplate") now respected (#263)

Upgraded

Gradle version to 5.6.2 (#616)
Kotlin to 1.3.60 (#658)

Fixed

.git directory now discovered instead of hardcoded (#623)
Several bugs with the experimental annotation rule (#628) (#642) (#654) (#624)
Allow newline after lambda return type (#643)
Allow empty first line in a function that returns an anonymous object (#655)
Indentation with lambda argument (#627)
ktlint can now lint UTF-8 files with BOM (#630
Indentation with newline before return type (#663)
Build/tests on Windows (#640)
Allow whitespace after ( followed by a comment (#664)

0.35.0 - 2019-10-12

Added

Support for specifying color for output via --color-name command line flag. (#585)
Support for custom rulesets and providers on Java 9+ (#573)

Deprecated

--apply-to-idea flag; use applyToIDEA subcommand instead (#554)
--apply-to-idea-project flag; use applyToIDEAProject subcommand instead (#593)
0.0.0-SNAPSHOT builds; snapshot builds are now versioned, e.g. 0.35.0-SNAPSHOT (#588)
- Note: When using the new snapshot builds, you may need to add an explicit dependency on kotlin-compiler-embeddable to your ruleset project.

Removed

Support for loading 3rd party rulesets via Maven (#566)

Upgraded

Kotlin version to 1.3.50 (#565) (#611)

Fixed

Bugs with spacing in experimental AnnotationRule (#552) (#601
Brackets would be removed from empty companion object (#600)
Bugs with experimental IndentationRule (#597) (#599)
Erroneous space between } and ] (#596)
Spacing around multiplication sign in lambdas (#598)
--version output with gradle-built JAR (#613)

0.34.2 - 2019-07-22

Minor bugfix release for 0.34.0. (Note: 0.34.1 deprecated/deleted due to regression in disabled_flags .editorconfig support.)

Added

Support for globally disabling rules via --disabled_rules command line flag. (#534)

Fixed

Regression with --stdin flag for printAST command (#528)
Regressions with NoUnusedImports rule (#531, #526)
- Note: this re-introduces #405
Indentation for enums with multi-line initializers (#518)

0.34.0 - 2019-07-15

Added

Support for Kotlin 1.3.41
Support for globally disabling rules via custom disabled_rules property in .editorconfig (#503)
experimental:no-empty-first-line-in-method-block (#474)
Unit tests for ruleset providers

Upgraded

AssertJ from 3.9.0 to 3.12.2 (#520)

Enabled

Final newline by default (#446)
no-wildcard-import (Re-enabled after temporarily disabling in 0.33.0)
experimental:annotation (#509)
experimental:multiline-if-else (no autocorrection)
experimental:package-name (currently only disallows underscores in package names)

Deprecated

MavenDependencyResolver. Scheduled to be removed in 0.35.0 (#468)
--install-git-pre-commit-hook flag; use installGitPreCommitHook subcommand instead (#487)
--print-ast flag; use printAST subcommand instead (#500)

Removed

Support for --ruleset-repository and --ruleset-update flags

Fixed

import-ordering will now refuse to format import lists that contain top-level comments (#408)
no-unused-imports reporting false negatives or false positives in some cases (#405) and (#506)
experimental:indent incorrectly formatting a lambda's closing brace (#479)

0.33.0 - 2019-05-28

Added

Support for Kotlin 1.3.31

Disabled

No wildcard imports rule (#48). Developers wishing to still enforce this rule should add the code into a custom ruleset.

Fixed

Spec file parsing is now platform-agnostic (#365)
Unnecessary newline after -> in some cases (#403)
SpacingAroundCommaRule will no longer move code into comments
Made newlines after = less aggressive (#368) (#380)
Erroneous newline when parameter comments are used (#433)

0.32.0 - 2019-04-22

Added

experimental/import-ordering rule (#189). Use ktlint --experimental to enabled.
Support for Kotlin 1.3.30
Build now compatible with jitpack
ktlint now part of Homebrew core (shyiko/ktlint tap deprecated)

Fixed

Incorrectly flagging a missing newline for functions with no parameters (#327).
Semicolons now allowed in KDocs (#362).
Spaces now disallowed after super (#369).
Annotations in function parameters now checked for indentation (#374]

Changed

Code now lives in com.pinterest package
groupId now com.pinterest
Custom ruleset META-INF.services file must be renamed to com.pinterest.ktlint.core.RuleSetProvider

0.31.0 - 2019-03-10

Added

dot-spacing rule (#293).
experimental/indent rule (#338).
Use ktlint --experimental to enable.

Fixed

Spacing check around < & > operators.

Changed

no-multi-spaces rule (horizontal alignment of comments is no longer allowed) (#269).
colon-spacing rule (: must not appear at the beginning of the line).
package-name rule (disabled until #208 is resolved).
--print-ast to output com.pinterest.ktlint.core.ast.ElementType.* as node.elementType, e.g.

$ echo 'fun f() {}' | ./ktlint/target/ktlint --print-ast --color --stdin
1: ~.psi.KtFile (FILE)
1:   ~.psi.KtPackageDirective (PACKAGE_DIRECTIVE) ""
1:   ~.psi.KtImportList (IMPORT_LIST) ""
1:   ~.psi.KtScript (SCRIPT)
1:     ~.psi.KtBlockExpression (BLOCK)
1:       ~.psi.KtNamedFunction (FUN)
1:         ~.c.i.p.impl.source.tree.LeafPsiElement (FUN_KEYWORD) "fun"
1:         ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) " "
1:         ~.c.i.p.impl.source.tree.LeafPsiElement (IDENTIFIER) "f"
1:         ~.psi.KtParameterList (VALUE_PARAMETER_LIST)
1:           ~.c.i.p.impl.source.tree.LeafPsiElement (LPAR) "("
1:           ~.c.i.p.impl.source.tree.LeafPsiElement (RPAR) ")"
1:         ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) " "
1:         ~.psi.KtBlockExpression (BLOCK)
1:           ~.c.i.p.impl.source.tree.LeafPsiElement (LBRACE) "{"
1:           ~.c.i.p.impl.source.tree.LeafPsiElement (RBRACE) "}"
1:       ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) "\n"

   format: <line_number:> <node.psi::class> (<node.elementType>) "<node.text>"
   legend: ~ = org.jetbrains.kotlin, c.i.p = com.intellij.psi

kotlin-compiler version to 1.3.21 (from 1.3.20).

Removed

Dependency on JCenter (#349).

0.30.0 - 2019-02-03

Fixed

Missing newline before ")" (#327).

Changed

kotlin-compiler version to 1.3.20 (from 1.2.71) (#331).

Security

--ruleset/--reporter switched to HTTPS (#332).

0.29.0 - 2018-10-02

Fixed

no-semi rule to preserve semicolon after companion object; (see #281 for details).
"line number off by one" when end_of_line=CRLF is used (#286).

Changed

package-name rule not to check file location (until #280 can be properly addressed).
comment-spacing rule not to flag //region & //endregion comments (#278).
kotlin-compiler version to 1.2.71 (from 1.2.51).

0.28.0 - 2018-09-05

Fixed

ktlint hanging in case of unhandled exception in a reporter (#277).

Changed

package-name rule (directories containing . in their names are no longer considered to be invalid) (#276).

0.27.0 - 2018-08-06

Changed

ktlint output (report location is now printed only if there are style violations) (#267).

0.26.0 - 2018-07-30

Changed

max-line-length rule (multi-line strings are no longer checked) (#262).

0.25.1 - 2018-07-25

Fixed

json reporter \ and control characters escaping (#256).

0.25.0 - 2018-07-25

Added

package-name rule (#246).
--editorconfig=path/to/.editorconfig (#250).
Support for end_of_line=native (.editorconfig) (#225).
tab -> space * indent_size auto-correction (--format/-F).

Fixed

"Unnecessary semicolon" false positive (#255).
(cannot be auto-corrected) reporting.
OOM in --debug mode while trying to print root=true <- root=false .editorconfig chain.

Changed

kotlin-compiler version to 1.2.51 (from 1.2.50).

0.24.0 - 2018-06-22

Added

paren-spacing rule (#223).
Report location output (#218, #224).
An indication that some lint errors cannot be auto-corrected (#219).
Git hook to automatically check files for style violations on push (an alternative to existing ktlint --install-git-pre-commit-hook)
(execute ktlint --install-git-pre-push-hook to install) (#229).
Support for end_of_line=crlf (.editorconfig) (#225).

Fixed

.editorconfig path resolution
(you no longer need to be inside project directory for .editorconfig to be loaded) (#207).
NPE in case of I/O error (klob@0.2.1).

Changed

comment-spacing rule to exclude //noinspection (#212).
kotlin-compiler version to 1.2.50 (from 1.2.41) (#226).

0.23.1 - 2018-05-04

Fixed

ClassCastException: cannot be cast to LeafPsiElement (#205).

0.23.0 - 2018-05-02

Added

comment-spacing (#198),
filename (#194) rules.
parameter-list-wrapping left parenthesis placement check (#201).
parameter-list-wrapping auto-correction when max_line_length is exceeded (#200).

Fixed

"Unused import" false positive (x.y.zNNN import inside x.y.z package) (#204).

Changed

kotlin-compiler version to 1.2.41 (from 1.2.40).

0.22.0 - 2018-04-22

Added

--apply-to-idea-project (as an alternative to (global) --apply-to-idea) (#178).
Check to verify that annotations are placed before the modifiers (#183).
Access to PsiFile location information (#194).

Fixed

--format commenting out operators (chain-wrapping rule) (#193).

Changed

indent rule (continuation_indent_size is now ignored) (#171).
NOTE: if you have a custom continuation_indent_size (and gcd(indent_size, continuation_indent_size) == 1) ktlint won't check the indentation.
--apply-to-idea to inherit "Predefined style / Kotlin style guide" (Kotlin plugin 1.2.20+).
kotlin-compiler version to 1.2.40 (from 1.2.30).

0.21.0 - 2018-03-29

Changed

indent rule to ignore where <type constraint list> clause (#180).

0.20.0 - 2018-03-20

Added

Ability to load 3rd party reporters from the command-line (e.g. --reporter=<name>,artifact=<group_id>:<artifact_id>:<version>) (#176).
--ruleset/--reporter dependency tree validation.

Fixed

Handling of spaces in --reporter=...,output=<path_to_a_file> (#177).
+, -, *, /, %, &&, || wrapping (#168).

Changed

comma-spacing rule to be more strict (#173).
no-line-break-after-else rule to allow multi-line if/else without curly braces.

0.19.0 - 2018-03-04

Changed

Lambda formatting: if lambda is assigned a label, there should be no space between the label and the opening curly brace (#167).

0.18.0 - 2018-03-01

Added

Java 9 support (#152).

Changed

kotlin-compiler version to 1.2.30 (from 1.2.20).

0.17.1 - 2018-02-28

Fixed

Internal Error (parameter-list-wrapping) when indent_size=unset (#165).

0.17.0 - 2018-02-28

Fixed

+/- wrapping inside catch block, after else and if (..) (#160).
Multi-line parameter declaration indentation (#161).
Expected indentation reported by indent rule.

Changed

Error code returned by ktlint --format/-F when some of the errors cannot be auto-corrected (previously it was 0 instead of expected 1) (#162).

0.16.1 - 2018-02-27

Fixed

Handling of negative number condition in when block (#160).

0.16.0 - 2018-02-27

Added

parameter-list-wrapping rule (#130).
+, -, *, /, %, &&, || wrapping check (now part of chain-wrapping rule).

Fixed

Unused componentN import (where N > 5) false positive (#142).
max-line-length error suppression (#158).

Changed

modifier-order rule to match official Kotlin Coding Conventions (#146)
(override modifier should be placed before suspend/tailrec, not after)

0.15.1 - 2018-02-14

Fixed

Race condition when multiple rules try to modify AST node that gets detached as a result of mutation (#154).

0.15.0 - 2018-01-18

Added

no-line-break-after-else rule (#125).

Changed

kotlin-compiler version to 1.2.20 (from 1.2.0).

0.14.0 - 2017-11-30

Changed

continuation_indent_size to 4 when --android profile is used (android/kotlin-guides#37).

Fixed

Maven integration (#117).

0.13.0 - 2017-11-28

Added

no-line-break-before-assignment (#105),
chain-wrapping (#23) (when wrapping chained calls ., ?. and ?: should be placed on the next line),
range-spacing (no spaces around range (..) operator) rules.
--print-ast CLI option which can be used to dump AST of the file
(see README / Creating a ruleset / AST for more details)
--color CLI option for colored output (where supported, e.g. --print-ast, default (plain) reporter, etc)

Changed

.editorconfig property resolution.
An explicit [*.{kt,kts}] is not required anymore (ktlint looks for sections containing *.kt (or *.kts) and will fallback to [*] whenever property cannot be found elsewhere).
Also, a search for .editorconfig will no longer stop on first (closest) .editorconfig (unless it contains root=true).
max-line-length rule to assume max_line_length=100 when ktlint --android ... is used
(per Android Kotlin Style Guide).
kotlin-compiler version to 1.2.0 (from 1.1.51).

Fixed

no-empty-class-body auto-correction at the end of file (#109).
max-line-length rule when applied to KDoc (#112)
(previously KDoc was subject to max-line-length even though regular comments were not).
Spacing around = in @annotation|s (op-spacing).
Spacing around generic type parameters of functions (e.g. fun <T>f(): T {} -> fun <T> f(): T {}).
no-consecutive-blank-lines not triggering at the end of file (when exactly 2 blank lines are present) (#108)
indent continuation_indent_size % indent_size != 0 case (#76)
indent rule skipping first parameter indentation check.
final-newline rule in the context of kotlin script.
Git hook (previously files containing space character (among others) in their names were ignored)
Exit code when file cannot be linted due to the invalid syntax or internal error.

0.12.1 - 2017-11-13

Fixed

A conflict between org.eclipse.aether:aether-*:1.1.0 and org.eclipse.aether:aether-*:1.0.0.v20140518 (#100).

0.12.0 - 2017-11-10

Added

--android (-a) CLI option (turns on Android Kotlin Style Guide compatibility)
(right now it's used only by ktlint --apply-to-idea).

Changed

ktlint --apply-to-idea to account for indent_size & continuation_indent_size in .editorconfig (if any).

Removed

ktlint-intellij-idea-integration binary (deprecated in 0.9.0).

Fixed

"Unused import" false positive (component1..component5).

0.11.1 - 2017-10-26

Fixed

--reporter's output handling (previously parent directory was expected to exist) (#97).

0.11.0 - 2017-10-25

Added

no-blank-line-before-rbrace rule (#65).

Fixed

Redundant space inserted between } and :: (curly-spacing).

0.10.2 - 2017-10-25 [YANKED]

This release contains changes that were meant for 0.11.0 and so it was retagged as such.

0.10.1 - 2017-10-22

Fixed

Redundant space inserted between } and [key]/(...) (curly-spacing) (#91).

0.10.0 - 2017-10-10

Added

Git hook to automatically check files for style violations on commit
(execute ktlint --install-git-pre-commit-hook to install).
Ability to specify multiple reporters
(output can be controlled with --reporter=<name>,output=<path/to/file>) (#71).
Support for indent_size=unset (.editorconfig) (#70).

Fixed

( { formatting
(previously both ( { and ({ were accepted as correct, while only ({ should be) (curly-spacing rule) (#80).
if\nfn {}\nelse formatting (curly-spacing rule).
max_line_length=off & max_line_length=unset handling (.editorconfig).

Changed

kotlin-compiler version to 1.1.51 (from 1.1.3-2).
ktlint --apply-to-idea to include OPTIMIZE_IMPORTS_ON_THE_FLY=true.

0.9.2 - 2017-09-01

Fixed

: Unit = formatting (: Unit is no longer dropped when = is used) (#77).

0.9.1 - 2017-07-30

Fixed

${super.toString()} linting (string-template rule) (#69).

0.9.0 - 2017-07-23

Added

Reporter API.
ktlint comes with 3 built-in reporters: plain (default; ?group_by_file can be appended to enable grouping by file (shown below)), json and checkstyle.

$ ktlint --reporter=plain?group_by_file
path/to/file.kt
  1:10 Unused import.
  2:10 Unnecessary "Unit" return type.
path/to/another-file.kt
  1:10 Unnecessary semicolon.

string-template,
no-empty-class-body,
max-line-length (#47),
final-newline (activated only if insert_final_newline is set in .editorconfig (under [*.{kt,kts}])) rules.
--limit CLI option (e.g. use --limit=10 to limit the number of errors to display).
--relative CLI flag which makes ktlint output file paths relative to working directory (e.g. dir/file.kt instead of /home/269/project/dir/file.kt).

Changed

BREAKING: JDK version to 1.8 (as a result of upgrading kotlin-compiler to 1.1.3-2 (from 1.1.0)).
File matching (offloaded to klob).

Deprecated

--ruleset-repository and --ruleset-update CLI arguments in favour of --repository and --repository-update respectively (--ruleset-* will be removed in 1.0.0).
ktlint-intellij-idea-integration binary
(Intellij IDEA integration task is now included in ktlint (as ktlint --apply-to-idea)).

0.8.3 - 2017-06-19

Fixed

"Missing spacing after ";"" at the end of package declaration (#59).
"Unused import" false positive (setValue) (#55).
get/setter spacing (#56).

0.8.2 - 2017-06-06

Fixed

"Unused import" false positive (getValue) (#54).

0.8.1 - 2017-05-30

Fixed

ktlint --stdin (#51).

0.8.0 - 2017-05-30

Added

.editorconfig support (right now only indent_size is honored and only if it's set in [*{kt,kts}] section).
Support for vertically aligned comments (see NoMultipleSpacesRuleTest.kt).

Fixed

ktlint-ruleset-standard ("no-unit-return" & "modifier-order" where not included).

0.7.1 - 2017-05-29

Fixed

Triggering of "Unused import" when element is referenced in KDoc(s) only (#46).

0.7.0 - 2017-05-28

Added

no-unit-return rule.
modifier-order rule (#42).
else/catch/finally on the same line as } check (now part of "keyword-spacing" rule).
ktlint-intellij-idea-integration binary for easy Intellij IDEA config injection.

0.6.2 - 2017-05-22

Fixed

Unused "iterator" extension function import false positive (#40).

0.6.1 - 2017-03-06

Fixed

Detection of unnecessary "same package" imports (no-unused-imports).
FileNotFoundException while scanning FS (#36).

0.6.0 - 2017-03-01

Changed

kotlin-compiler version to 1.1.0 (from 1.1-M04).

0.5.1 - 2017-02-28

Fixed

Unnecessary spacing around angle brackets in case of super<T> (#34).

0.5.0 - 2017-02-20

Fixed

Redundant space inserted between } and !! (curly-spacing).

Changed

indent rule to allow "Method declaration parameters -> Align when multiline" (as this option is (unfortunately) "on" by default in Intellij IDEA) (#26).

0.4.0 - 2017-02-01

Fixed

NPE in case of "Permission denied" (while scanning the file system).

Changed

kotlin-compiler version to 1.1-M04 (from 1.0.6).

0.3.1 - 2017-01-25

Fixed

Unused infix function call import false positive (#25).

0.3.0 - 2017-01-11

Added

*.kts (script) support.

Changed

kotlin-compiler version to 1.0.6 (from 1.0.3).

0.2.2 - 2016-10-11

Fixed

no-wildcard-imports rule (kotlinx.android.synthetic excluded from check) (#16).

0.2.1 - 2016-09-13

Fixed

curly-spacing false negative in case of }?..

0.2.0 - 2016-09-05

Added

Support for 3rd party "ruleset"s.

Changed

ktlint -F output (it now includes lint errors that cannot be fixed automatically).

Fixed

ktlint -F --debug error count.
Glob implementation (previously it was prone to catastrophic backtracking).
Redundant semicolon false positive in case of enum (#12).
Unused operator import false positive (#13).

0.1.2 - 2016-08-05

Fixed

"in-use" escaped imports detection (#7) (no-unused-imports).

0.1.1 - 2016-08-01

Fixed

Incorrect spacing around curly braces (curly-spacing).

Files

CHANGELOG.md

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CHANGELOG.md

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Changelog

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0.40.0 - 2020-12-04

Added

Fixed

Changed

0.39.0 - 2020-09-14

Added

Fixed

Changed

0.38.1 - 2020-08-24

Changed

0.38.0 - 2020-08-21

Added

Fixed

Changed

0.37.2 - 2020-06-16

Fixed

0.37.1 - 2020-06-08

Fixed

0.37.0 - 2020-06-02

Added

Changed

Fixed

Removed

0.36.0 - 2019-12-03

Added

Upgraded

Fixed

0.35.0 - 2019-10-12

Added

Deprecated

Removed

Upgraded

Fixed

0.34.2 - 2019-07-22

Added

Fixed

0.34.0 - 2019-07-15

Added

Upgraded

Enabled

Deprecated

Removed

Fixed

0.33.0 - 2019-05-28

Added

Disabled

Fixed

0.32.0 - 2019-04-22

Added

Fixed

Changed

0.31.0 - 2019-03-10

Added

Fixed

Changed

Removed

0.30.0 - 2019-02-03

Fixed

Changed

Security

0.29.0 - 2018-10-02

Fixed

Changed

0.28.0 - 2018-09-05

Fixed

Changed

0.27.0 - 2018-08-06

Changed