add kotlin to project

Habitica/build.gradle

@@ -1,4 +1,6 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 apply plugin: 'com.android.databinding'
 apply plugin: 'io.fabric'
 apply plugin: 'com.neenbedankt.android-apt'
@@ -132,6 +134,7 @@ dependencies {
         exclude group: 'com.google.android.gms'
         exclude group: 'com.android.support', module: 'multidex'
     }
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
 }
 
 android {

build.gradle

@@ -1,8 +1,10 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.kotlin_version = '1.1.51'
     repositories {
         jcenter()
+        maven { url "https://plugins.gradle.org/m2/" }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.3'
@@ -12,14 +14,26 @@ buildscript {
         classpath 'me.tatarka:gradle-retrolambda:3.3.1'
         classpath 'me.tatarka.retrolambda.projectlombok:lombok.ast:0.2.3.a2'
         classpath "io.realm:realm-gradle-plugin:3.7.2"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "gradle.plugin.io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.0.0.RC4-3"
     }
 
     // Exclude the version that the android plugin depends on.
     configurations.classpath.exclude group: 'com.android.tools.external.lombok'
 }
 
+apply plugin: 'io.gitlab.arturbosch.detekt'
+
 allprojects {
     repositories {
         jcenter()
     }
+}
+
+detekt {
+    profile("main") {
+        input = "$projectDir/Habitica/src/main/java"
+        config = "$projectDir/detekt.yml"
+        output = "$projectDir/reports/detekt"
+    }
 }

detekt.yml

@@ -0,0 +1,325 @@
+autoCorrect: true
+failFast: false
+
+build:
+  warningThreshold: 5
+  failThreshold: 10
+  weights:
+    complexity: 2
+    formatting: 1
+    LongParameterList: 1
+    comments: 1
+
+processors:
+  active: true
+  exclude:
+  # - 'FunctionCountProcessor'
+  # - 'PropertyCountProcessor'
+  # - 'ClassCountProcessor'
+  # - 'PackageCountProcessor'
+  # - 'KtFileCountProcessor'
+
+console-reports:
+  active: true
+  exclude:
+  #  - 'ProjectStatisticsReport'
+  #  - 'ComplexityReport'
+  #  - 'NotificationReport'
+  #  - 'FindingsReport'
+  #  - 'BuildFailureReport'
+
+output-reports:
+  active: true
+  exclude:
+  #  - 'PlainOutputReport'
+  #  - 'XmlOutputReport'
+
+potential-bugs:
+  active: true
+  DuplicateCaseInWhenExpression:
+    active: true
+  EqualsAlwaysReturnsTrueOrFalse:
+    active: false
+  EqualsWithHashCodeExist:
+    active: true
+  WrongEqualsTypeParameter:
+    active: false
+  ExplicitGarbageCollectionCall:
+    active: true
+  UnreachableCode:
+    active: true
+  LateinitUsage:
+    active: false
+  UnsafeCallOnNullableType:
+    active: true
+  UnsafeCast:
+    active: true
+  UselessPostfixExpression:
+    active: false
+
+performance:
+  active: true
+  ForEachOnRange:
+    active: true
+  SpreadOperator:
+    active: true
+  UnnecessaryTemporaryInstantiation:
+    active: true
+
+exceptions:
+  active: true
+  ExceptionRaisedInUnexpectedLocation:
+    active: false
+    methodNames: 'toString,hashCode,equals,finalize'
+  SwallowedException:
+    active: false
+  TooGenericExceptionCaught:
+    active: true
+    exceptions:
+      - ArrayIndexOutOfBoundsException
+      - Error
+      - Exception
+      - IllegalMonitorStateException
+      - IndexOutOfBoundsException
+      - InterruptedException
+      - NullPointerException
+      - RuntimeException
+  TooGenericExceptionThrown:
+    active: true
+    exceptions:
+      - Throwable
+      - ThrowError
+      - ThrowException
+      - ThrowNullPointerException
+      - ThrowRuntimeException
+      - ThrowThrowable
+  InstanceOfCheckForException:
+    active: false
+  IteratorNotThrowingNoSuchElementException:
+    active: false
+  PrintExceptionStackTrace:
+    active: false
+  RethrowCaughtException:
+    active: false
+  ReturnFromFinally:
+    active: false
+  ThrowingExceptionFromFinally:
+    active: false
+  ThrowingExceptionInMain:
+    active: false
+  ThrowingNewInstanceOfSameException:
+    active: false
+
+empty-blocks:
+  active: true
+  EmptyCatchBlock:
+    active: true
+  EmptyClassBlock:
+    active: true
+  EmptyDefaultConstructor:
+    active: true
+  EmptyDoWhileBlock:
+    active: true
+  EmptyElseBlock:
+    active: true
+  EmptyFinallyBlock:
+    active: true
+  EmptyForBlock:
+    active: true
+  EmptyFunctionBlock:
+    active: true
+  EmptyIfBlock:
+    active: true
+  EmptyInitBlock:
+    active: true
+  EmptySecondaryConstructor:
+    active: true
+  EmptyWhenBlock:
+    active: true
+  EmptyWhileBlock:
+    active: true
+
+complexity:
+  active: true
+  LongMethod:
+    threshold: 20
+  LongParameterList:
+    threshold: 5
+  LargeClass:
+    threshold: 150
+  ComplexMethod:
+    threshold: 10
+  TooManyFunctions:
+    threshold: 10
+  ComplexCondition:
+    threshold: 3
+  LabeledExpression:
+    active: false
+  StringLiteralDuplication:
+    active: true
+    threshold: 2
+    ignoreAnnotation: true
+    excludeStringsWithLessThan5Characters: true
+    ignoreStringsRegex: '$^'
+
+code-smell:
+  active: true
+  FeatureEnvy:
+    threshold: 0.5
+    weight: 0.45
+    base: 0.5
+
+formatting:
+  active: true
+  useTabs: true
+  Indentation:
+    active: false
+    indentSize: 4
+  ConsecutiveBlankLines:
+    active: true
+    autoCorrect: true
+  MultipleSpaces:
+    active: true
+    autoCorrect: true
+  SpacingAfterComma:
+    active: true
+    autoCorrect: true
+  SpacingAfterKeyword:
+    active: true
+    autoCorrect: true
+  SpacingAroundColon:
+    active: true
+    autoCorrect: true
+  SpacingAroundCurlyBraces:
+    active: true
+    autoCorrect: true
+  SpacingAroundOperator:
+    active: true
+    autoCorrect: true
+  TrailingSpaces:
+    active: true
+    autoCorrect: true
+  UnusedImports:
+    active: true
+    autoCorrect: true
+  OptionalSemicolon:
+    active: true
+    autoCorrect: true
+  OptionalUnit:
+    active: true
+    autoCorrect: true
+  ExpressionBodySyntax:
+    active: false
+    autoCorrect: false
+  ExpressionBodySyntaxLineBreaks:
+    active: false
+    autoCorrect: false
+  OptionalReturnKeyword:
+    active: true
+    autoCorrect: false
+
+style:
+  active: true
+  ReturnCount:
+    active: true
+    max: 2
+  NewLineAtEndOfFile:
+    active: false
+  OptionalAbstractKeyword:
+    active: true
+  OptionalWhenBraces:
+    active: false
+  EqualsNullCall:
+    active: true
+  ForbiddenComment:
+    active: true
+    values: 'TODO:,FIXME:,STOPSHIP:'
+  ForbiddenImport:
+    active: false
+    imports: ''
+  PackageDeclarationStyle:
+    active: false
+  ModifierOrder:
+    active: true
+  MagicNumber:
+    active: true
+    ignoreNumbers: '-1,0,1,2'
+    ignoreHashCodeFunction: false
+    ignorePropertyDeclaration: false
+    ignoreAnnotation: false
+  WildcardImport:
+    active: true
+  SafeCast:
+    active: true
+  MaxLineLength:
+    active: true
+    maxLineLength: 120
+    excludePackageStatements: false
+    excludeImportStatements: false
+  PackageNaming:
+    active: true
+    packagePattern: '^[a-z]+(\.[a-z][a-z0-9]*)*$'
+  ClassNaming:
+    active: true
+    classPattern: '[A-Z$][a-zA-Z$]*'
+  EnumNaming:
+    active: true
+    enumEntryPattern: '^[A-Z$][a-zA-Z_$]*$'
+  FunctionNaming:
+    active: true
+    functionPattern: '^[a-z$][a-zA-Z$0-9]*$'
+  FunctionMaxLength:
+    active: true
+    maximumFunctionNameLength: 30
+  FunctionMinLength:
+    active: true
+    minimumFunctionNameLength: 3
+  VariableNaming:
+    active: true
+    variablePattern: '^(_)?[a-z$][a-zA-Z$0-9]*$'
+  ConstantNaming:
+    active: true
+    constantPattern: '^([A-Z_]*|serialVersionUID)$'
+  VariableMaxLength:
+    active: true
+    maximumVariableNameLength: 30
+  VariableMinLength:
+    active: true
+    minimumVariableNameLength: 3
+  ForbiddenClassName:
+    active: false
+    forbiddenName: ''
+  ProtectedMemberInFinalClass:
+    active: false
+  UnnecessaryParentheses:
+    active: false
+  DataClassContainsFunctions:
+    active: false
+  UseDataClass:
+    active: false
+  UnnecessaryAbstractClass:
+    active: false
+
+comments:
+  active: true
+  CommentOverPrivateMethod:
+    active: true
+  CommentOverPrivateProperty:
+    active: true
+  UndocumentedPublicClass:
+    active: false
+    searchInNestedClass: true
+    searchInInnerClass: true
+    searchInInnerObject: true
+    searchInInnerInterface: true
+  UndocumentedPublicFunction:
+    active: false
+
+# *experimental feature*
+# Migration rules can be defined in the same config file or a new one
+migration:
+  active: true
+  imports:
+    # your.package.Class: new.package.or.Class
+    # for example:
+    # io.gitlab.arturbosch.detekt.api.Rule: io.gitlab.arturbosch.detekt.rule.Rule