Meet detekt, a static code analysis tool for the Kotlin programming language. It operates on the abstract syntax tree provided by the Kotlin compiler.

• code smell analysis for your kotlin projects
• complexity report based on logical lines of code, McCabe complexity and amount of code smells
• highly configurable (rule set or rule level)
• suppress findings with Kotlin's @Suppress and Java's @SuppressWarnings annotations
• specify code smell thresholds to break your build or print a warning
• code Smell baseline and ignore lists for legacy projects
• gradle plugin for code analysis via Gradle builds
• gradle tasks to use local intellij distribution for formatting and inspecting kotlin code
• optionally configure detekt for each sub module by using profiles (gradle-plugin)
• sonarqube integration
• extensible by own rule sets and FileProcessListener's
• intellij integration
• unofficial maven plugin by the user Ozsie

Visit https://arturbosch.github.io/detekt/ for installation guides, release notes, migration guides, rule descriptions and configuration options.

• git clone https://github.com/arturbosch/detekt
• cd detekt
• ./gradlew build shadowJar
• java -jar detekt-cli/build/libs/detekt-cli-[version]-all.jar --help

buildscript {
    repositories {
        jcenter()
    }
}

plugins {
    id "io.gitlab.arturbosch.detekt" version "1.0.0.[version]"
}

detekt {
    version = "1.0.0.[version]"
    defaultProfile {
        input = file("src/main/kotlin")
        filters = ".*/resources/.*,.*/build/.*"
    }
}

detekt itself provides a wrapper over KtLint as a formatting rule set which can be easily added to the gradle configuration:

dependencies {
    detekt "io.gitlab.arturbosch.detekt:detekt-formatting:1.0.0.[version]"
}

Likewise custom extensions can be added to detekt.

If you contributed to detekt but your name is not in the list, please feel free to add yourself to it!

• Artur Bosch - Maintainer
• Marvin Ramin - Collaborator, Bunch of rules, Active on Issues, refactorings, MultiRule
• schalks - Collaborator, Active on Issues, Bunch of rules, Project metrics
• Niklas Baudy - Active on Issues, Bunch of rules, Bug fixes
• lummax - Cli enhancements
• Svyatoslav Chatchenko - Active on Issues, NamingConventions and UnusedImport fixes
• Sean Flanigan - Config from classpath resource
• Sebastian Schuberth - Active on Issues, Windows support
• Olivier Lemasle - NP-Bugfix, rules fixes, Gradle plugin improvement
• Marc Prengemann - Support for custom output formats, prototyped Rule-Context-Issue separation
• Sebastiano Poggi - Enhanced milestone report script, Magic number fixes
• Ilya Tretyakov - Sonar runs should not auto correct formatting.
• Andrey T - Readme fix
• Ivan Balaksha - Rules: UnsafeCast, SpreadOperator, UnsafeCallOnNullableType, LabeledExpression
• Anna Y - Readme fix
• Karol Wrótniak - Treat comments as not empty blocks
• Radim Vaculik - VariableMaxLength - bugfix
• Martin Nonnenmacher - UndocumentedPublicClass - enum support
• Dmytro Troynikov - Updated Magic Number rule to ignore Named Arguments
• Andrew Ochsner - Updated Readme for failFast option
• Paul Merlin - Gradle build improvements
• Konstantin Aksenov - Coding improvement
• Matthew Haughton - Started type resolution, Dependency updates, Coding + Documentation improvements
• Janusz Bagiński - Fixed line number reporting for MaxLineLengthRule
• Mike Kobit - Gradle build improvements
• Philipp Hofmann - Readme improvements
• Olivier PEREZ - Fixed Typo in Readme
• Sebastian Kaspari - Html-Output-Format, Documentation fix
• Ilya Zorin - Rule improvement: UnnecessaryAbstractClass
• Gesh Markov - Improve error message for incorrect configuration file
• Patrick Pilch - Rule improvement: ReturnCount
• Serj Lotutovici - Rule improvement: LongParameterList
• Dmitry Primshyts - Rule improvement: MagicNumber
• Egor Neliuba - Rule improvement: EmptyFunctionBlock, EmptyClassBlock
• Said Tahsin Dane - Gradle plugin improvements
• Misa Torres - Added: TrailingWhitespace and NoTabs rules
• R.A. Porter - Updated Readme links to RuleSets
• Robbin Voortman - Rule improvement: MaxLineLength
• Mike Gorunov — Rule improvement: UndocumentedPublicFunction
• Joey Kaan - New rule: MandatoryBracesIfStatements
• Dmitriy Samaryan - Rule fix: SerialVersionUIDInSerializableClass
• Mariano Simone - Rule improvement: UnusedPrivateMember
• Shunsuke Maeda - Fix: to work on multi module project using maven plugin

As mentioned in...

• @medium/acerezoluna/static-code-analysis-tools-for-kotlin-in-android
• @medium/annayan/writing-custom-lint-rules-for-your-kotlin-project-with-detekt
• Free Continuous Integration for modern Android apps with CircleCI
• Static code analysis for Kotlin in Android
• The Art of Android DevOps
• Android Basics: Continuous Integration
• Kotlin Static Analysis — why and how?
• Check the quality of Kotlin code

Integrations:

• SonarKotlin
• Codacy
• Gradle plugin that generates ErrorProne, Findbugs, Checkstyle, PMD, CPD, Lint, Detekt & Ktlint Tasks for every subproject
• Java library for parsing report files from static code analysis
• sputnik is a free tool for static code review and provides support for detekt
• Novoda Gradle Static Analysis plugin
• Maven plugin that wraps the Detekt CLI

• JetBrains - Creating Intellij + Kotlin
• PMD & Checkstyle & KtLint - Ideas for threshold values and style rules