commit 454a87faa298e5d1a36fb3233b71243cb237787f
Author: ArtiSmarti <arturbosch@gmx.de>
Date:   Sun Oct 16 02:41:25 2016 +0200

    Add project baseline

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..d22960f06
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,155 @@
+#Mac-User :>
+.DS_Store
+
+# Created by https://www.gitignore.io
+
+### Eclipse ###
+*.pydevproject
+.metadata
+.gradle
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.project
+.classpath
+
+### IDEA ###
+*.idea
+
+/local.properties
+/build
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# CDT-specific
+.cproject
+
+# PDT-specific
+.buildpath
+
+# sbteclipse plugin 
+.target
+
+# TeXlipse plugin
+.texlipse
+
+
+### Java ###
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.war
+*.ear
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+### LaTeX ###
+*.acn
+*.acr
+*.alg
+*.aux
+*.bbl
+*.blg
+*.dvi
+*.fdb_latexmk
+*.glg
+*.glo
+*.gls
+*.ilg
+*.ind
+*.ist
+*.lof
+*.log
+*.lot
+*.maf
+*.mtc
+*.mtc0
+*.nav
+*.nlo
+*.out
+*.pdfsync
+*.ps
+*.snm
+*.synctex.gz
+*.toc
+*.vrb
+*.xdy
+*.tdo
+
+
+## Intermediate documents:
+*-converted-to.*
+# these rules might exclude image files for figures etc.
+# *.ps
+# *.eps
+# *.pdf
+
+## Bibliography auxiliary files (bibtex/biblatex/biber):
+*.bcf
+*-blx.aux
+*-blx.bib
+*.brf
+*.run.xml
+
+## Build tool auxiliary files:
+*.synctex.gz(busy)
+
+## Auxiliary and intermediate files from other packages:
+
+# algorithms
+*.loa
+
+# amsthm
+*.thm
+
+
+#(e)ledmac/(e)ledpar
+*.end
+*.[1-9][0-9][0-9]
+*.[1-9]R
+*.[1-9][0-9]R
+*.[1-9][0-9][0-9]R
+*.eledsec[1-9]
+*.eledsec[1-9]R
+*.eledsec[1-9][0-9]
+*.eledsec[1-9][0-9]R
+*.eledsec[1-9][0-9][0-9]
+*.eledsec[1-9][0-9][0-9]R
+
+# listings
+*.lol
+
+# minted
+*.pyg
+
+# morewrites
+*.mw
+
+# sagetex
+*.sagetex.sage
+*.sagetex.py
+*.sagetex.scmd
+
+# sympy
+*.sout
+*.sympy
+sympy-plots-for-*.tex/
+
+## Maven
+target/
+
+/classes/
+/out/
+/src/test/kotlin/io/gitlab/arturbosch/detekt/ReproduceSpec.kt
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 000000000..0fff7e763
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,40 @@
+group 'io.gitlab.arturbosch.detekt'
+version '1.0.0.M1'
+
+buildscript {
+	ext.kotlin_version = '1.0.4'
+	ext.spek_version = '1.1.18'
+
+	repositories {
+		mavenCentral()
+	}
+	dependencies {
+		classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+		classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.0-M2'
+	}
+}
+
+apply plugin: 'kotlin'
+apply plugin: 'org.junit.platform.gradle.plugin'
+
+repositories {
+	mavenCentral()
+	maven {
+		url "http://dl.bintray.com/jetbrains/spek"
+	}
+}
+
+junitPlatform {
+	engines {
+		include 'spek'
+	}
+}
+
+dependencies {
+	compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+	compile "org.jetbrains.kotlin:kotlin-compiler:$kotlin_version"
+	testCompile "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
+	testCompile "org.jetbrains.spek:spek-api:$spek_version"
+	testRuntime 'org.junit.platform:junit-platform-launcher:1.0.0-M2'
+	testRuntime "org.jetbrains.spek:spek-junit-platform-engine:$spek_version"
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 000000000..ca78035ef
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 000000000..4f635fd1b
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Wed Aug 10 21:02:57 CEST 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.14-all.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 000000000..27309d923
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 000000000..832fdb607
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 000000000..f94fb56d1
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'detekt'
+
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/Junk.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/Junk.kt
new file mode 100644
index 000000000..77d1f958a
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/Junk.kt
@@ -0,0 +1,20 @@
+package io.gitlab.arturbosch.detekt
+
+import io.gitlab.arturbosch.detekt.api.Finding
+
+/**
+ * @author Artur Bosch
+ */
+
+inline fun <T> Collection<T>.each(action: (T) -> Unit): Unit {
+	for (element in this) action(element)
+}
+
+fun Any?.print(prefix: String = "", suffix: String = ""): Unit {
+	println("$prefix$this$suffix")
+}
+
+fun printFindings(result: Pair<String, List<Finding>>) {
+	result.first.print("Ruleset: ")
+	result.second.each { it.compact().print("\t") }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/Main.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/Main.kt
new file mode 100644
index 000000000..d703d01f8
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/Main.kt
@@ -0,0 +1,17 @@
+package io.gitlab.arturbosch.detekt
+
+import io.gitlab.arturbosch.detekt.core.KtCompiler
+import io.gitlab.arturbosch.detekt.default.CodeSmellProvider
+import io.gitlab.arturbosch.detekt.default.StyleGuideProvider
+import java.nio.file.Paths
+
+/**
+ * @author Artur Bosch
+ */
+fun main(args: Array<String>) {
+	val compiler = KtCompiler()
+	val path = Paths.get("./src/test/resources/cases/Default.kt")
+	val file = compiler.compile(path)
+	printFindings(CodeSmellProvider().instance().acceptAll(listOf(file)))
+	printFindings(StyleGuideProvider().instance().acceptAll(listOf(file)))
+}
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Findings.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Findings.kt
new file mode 100644
index 000000000..37ba4b51e
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Findings.kt
@@ -0,0 +1,54 @@
+package io.gitlab.arturbosch.detekt.api
+
+import org.jetbrains.kotlin.diagnostics.DiagnosticUtils
+import org.jetbrains.kotlin.psi.KtElement
+import org.jetbrains.kotlin.psi.psiUtil.endOffset
+import org.jetbrains.kotlin.psi.psiUtil.getTextWithLocation
+import org.jetbrains.kotlin.psi.psiUtil.startOffset
+
+/**
+ * @author Artur Bosch
+ */
+
+interface Finding {
+	val id: String
+	fun compact(): String
+}
+
+data class CodeSmell(override val id: String, val location: Location) : Finding {
+	override fun compact(): String {
+		return "$id - ${location.text} - ${location.file}"
+	}
+}
+
+data class Location(val source: SourceLocation,
+					val text: TextLocation,
+					val locationString: String,
+					val file: String) {
+
+	companion object {
+		fun of(element: KtElement): Location {
+			val start = startLineAndColumn(element)
+			val sourceLocation = SourceLocation(start.line, start.column)
+			val textLocation = TextLocation(element.startOffset, element.endOffset)
+			return Location(sourceLocation, textLocation,
+					element.getTextWithLocation(), element.getContainingKtFile().name)
+		}
+
+		private fun startLineAndColumn(element: KtElement) = DiagnosticUtils.getLineAndColumnInPsiFile(
+				element.getContainingKtFile(), element.textRange)
+	}
+
+}
+
+data class SourceLocation(val line: Int, val column: Int) {
+	override fun toString(): String {
+		return "($line,$column)"
+	}
+}
+
+data class TextLocation(val start: Int, val end: Int) {
+	override fun toString(): String {
+		return "($start,$end)"
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Junk.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Junk.kt
new file mode 100644
index 000000000..3800b304f
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Junk.kt
@@ -0,0 +1,24 @@
+package io.gitlab.arturbosch.detekt.api
+
+import com.intellij.lang.ASTNode
+import org.jetbrains.kotlin.psi.KtElement
+import org.jetbrains.kotlin.psi.KtPsiUtil
+
+/**
+ * @author Artur Bosch
+ */
+
+private val identifierRegex = Regex("[aA-zZ]+([-][aA-zZ]+)*")
+
+fun validateIdentifier(id: String) {
+	require(id.matches(identifierRegex), { "id must match [aA-zZ]+([-][aA-zZ]+)*" })
+}
+
+fun ASTNode.visitTokens(currentNode: (node: ASTNode) -> Unit) {
+	currentNode(this)
+	getChildren(null).forEach { it.visitTokens(currentNode) }
+}
+
+fun ASTNode.visit(visitor: KastVisitor) {
+	KtPsiUtil.visitChildren(this.psi as KtElement, visitor, null)
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/KastVisitor.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/KastVisitor.kt
new file mode 100644
index 000000000..a4a6a4751
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/KastVisitor.kt
@@ -0,0 +1,10 @@
+package io.gitlab.arturbosch.detekt.api
+
+import org.jetbrains.kotlin.psi.KtTreeVisitorVoid
+
+/**
+ * @author artur
+ */
+open class KastVisitor : KtTreeVisitorVoid() {
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Rule.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Rule.kt
new file mode 100644
index 000000000..2cf00242d
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Rule.kt
@@ -0,0 +1,38 @@
+package io.gitlab.arturbosch.detekt.api
+
+import com.intellij.lang.ASTNode
+
+/**
+ * @author Artur Bosch
+ */
+abstract class Rule(val id: String, val severity: Severity = Rule.Severity.Minor) : KastVisitor() {
+
+	enum class Severity {
+		CodeSmell, Style, Warning, Defect, Minor, Major, Security
+	}
+
+	private var _findings: MutableList<Finding> = mutableListOf()
+	val findings: List<Finding>
+		get() = _findings.toList()
+
+	init {
+		validateIdentifier(id)
+	}
+
+	open fun visit(root: ASTNode) {
+		preVisit(root)
+		root.visit(this)
+		postVisit(root)
+	}
+
+	protected open fun postVisit(root: ASTNode) {
+	}
+
+	protected open fun preVisit(root: ASTNode) {
+		_findings = mutableListOf()
+	}
+
+	protected fun addFindings(vararg finding: Finding) {
+		_findings.addAll(finding)
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/RuleSet.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/RuleSet.kt
new file mode 100644
index 000000000..cb80d3f82
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/RuleSet.kt
@@ -0,0 +1,28 @@
+package io.gitlab.arturbosch.detekt.api
+
+import org.jetbrains.kotlin.psi.KtFile
+
+/**
+ * @author Artur Bosch
+ */
+class RuleSet(val id: String, val rules: List<Rule>) {
+
+	init {
+		validateIdentifier(id)
+	}
+
+	fun acceptAll(files: List<KtFile>): Pair<String, List<Finding>> {
+		return id to files.flatMap { accept(it) }
+	}
+
+	private fun accept(file: KtFile): List<Finding> {
+		val findings: MutableList<Finding> = mutableListOf()
+		val root = file.node
+		rules.forEach {
+			it.visit(root)
+			findings += it.findings
+		}
+		return findings
+	}
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/RuleSetProvider.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/RuleSetProvider.kt
new file mode 100644
index 000000000..7ff67bc40
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/RuleSetProvider.kt
@@ -0,0 +1,9 @@
+package io.gitlab.arturbosch.detekt.api
+
+/**
+ * @author Artur Bosch
+ */
+interface RuleSetProvider {
+
+	fun instance(): RuleSet
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/SpecificRules.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/SpecificRules.kt
new file mode 100644
index 000000000..43d17e8ff
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/SpecificRules.kt
@@ -0,0 +1,9 @@
+package io.gitlab.arturbosch.detekt.api
+
+/**
+ * @author Artur Bosch
+ */
+
+abstract class MetricThresholdRule(id: String, val threshold: Int, severity: Severity = Rule.Severity.Minor) : Rule(id, severity)
+
+abstract class MetricThresholdCodeSmellRule(id: String, threshold: Int) : MetricThresholdRule(id, threshold, Rule.Severity.CodeSmell)
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/api/TokenRule.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/TokenRule.kt
new file mode 100644
index 000000000..e3b130492
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/api/TokenRule.kt
@@ -0,0 +1,17 @@
+package io.gitlab.arturbosch.detekt.api
+
+import com.intellij.lang.ASTNode
+
+/**
+ * @author Artur Bosch
+ */
+abstract class TokenRule(id: String) : Rule(id) {
+
+	override fun visit(root: ASTNode) {
+		preVisit(root)
+		root.visitTokens { procedure(it) }
+		postVisit(root)
+	}
+
+	abstract fun procedure(node: ASTNode): Unit
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/Detekt.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/Detekt.kt
new file mode 100644
index 000000000..3ed15960e
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/Detekt.kt
@@ -0,0 +1,38 @@
+package io.gitlab.arturbosch.detekt.core
+
+import io.gitlab.arturbosch.detekt.api.Finding
+import io.gitlab.arturbosch.detekt.api.RuleSetProvider
+import java.net.URLClassLoader
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.ServiceLoader
+
+/**
+ * @author Artur Bosch
+ */
+open class Detekt(project: Path,
+				  val ruleSets: List<Path> = listOf(),
+				  pathFilters: List<String> = listOf(),
+				  parallelCompilation: Boolean = false) {
+
+	private val compiler: KtTreeCompiler
+
+	init {
+		require(Files.exists(project)) { "Given project path does not exist!" }
+		val filters = pathFilters.map(::PathFilter)
+		compiler = KtTreeCompiler(project, filters, parallelCompilation)
+	}
+
+	fun run(): Map<String, List<Finding>> {
+		val ktFiles = compiler.compile()
+		val providers = loadProviders()
+		return providers.map { it.instance().acceptAll(ktFiles) }.toMap()
+	}
+
+	private fun loadProviders(): ServiceLoader<RuleSetProvider> {
+		val urls = ruleSets.map { it.toUri().toURL() }.toTypedArray()
+		val detektLoader = URLClassLoader(urls)
+		return ServiceLoader.load(RuleSetProvider::class.java, detektLoader)
+	}
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/Junk.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/Junk.kt
new file mode 100644
index 000000000..242fce18a
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/Junk.kt
@@ -0,0 +1,16 @@
+package io.gitlab.arturbosch.detekt.core
+
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.stream.Collectors
+import java.util.stream.Stream
+
+/**
+ * @author Artur Bosch
+ */
+
+fun <T> Stream<T>.toList(): List<T> = collect(Collectors.toList<T>())
+
+fun Path.isFile(): Boolean = Files.isRegularFile(this)
+fun Path.isDirectory(): Boolean = Files.isDirectory(this)
+fun Path.hasEnding(ending: String): Boolean = this.toAbsolutePath().toString().endsWith(ending)
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/KtCompiler.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/KtCompiler.kt
new file mode 100644
index 000000000..2a9fec6ea
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/KtCompiler.kt
@@ -0,0 +1,32 @@
+package io.gitlab.arturbosch.detekt.core
+
+import com.intellij.openapi.util.Disposer
+import com.intellij.psi.PsiFileFactory
+import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles
+import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.idea.KotlinLanguage
+import org.jetbrains.kotlin.psi.KtFile
+import java.nio.file.Files
+import java.nio.file.Path
+
+/**
+ * @author Artur Bosch
+ */
+class KtCompiler {
+
+	private val psiFileFactory: PsiFileFactory
+
+	init {
+		val project = KotlinCoreEnvironment.createForProduction(Disposer.newDisposable(),
+				CompilerConfiguration(), EnvironmentConfigFiles.JVM_CONFIG_FILES).project
+		psiFileFactory = PsiFileFactory.getInstance(project)
+	}
+
+	fun compile(path: Path): KtFile {
+		require(path.isFile()) { "Given path should be a regular file!" }
+		val file = path.normalize()
+		val content = String(Files.readAllBytes(file))
+		return psiFileFactory.createFileFromText(file.fileName.toString(), KotlinLanguage.INSTANCE, content) as KtFile
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/KtTreeCompiler.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/KtTreeCompiler.kt
new file mode 100644
index 000000000..936998335
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/KtTreeCompiler.kt
@@ -0,0 +1,44 @@
+package io.gitlab.arturbosch.detekt.core
+
+import org.jetbrains.kotlin.psi.KtFile
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.stream.Stream
+
+/**
+ * @author Artur Bosch
+ */
+class KtTreeCompiler(val project: Path,
+					 val filters: List<PathFilter> = listOf(),
+					 val parallel: Boolean = false) {
+
+	private val compiler = KtCompiler()
+
+	fun compile(): List<KtFile> {
+		return if (project.isFile()) {
+			listOf(compiler.compile(project))
+		} else if (project.isDirectory()) {
+			compileInternal(
+					if (parallel) {
+						Files.walk(project).parallel()
+					} else {
+						Files.walk(project)
+					}
+			)
+		} else {
+			throw IllegalArgumentException("Provided project path $project is not a file/dir." +
+					" Defekt cannot work with it!")
+		}
+	}
+
+	private fun compileInternal(sequentialStream: Stream<Path>): List<KtFile> {
+		return sequentialStream
+				.filter(Path::isFile)
+				.filter { it.hasEnding("kt") }
+				.filter { notIgnored(it) }
+				.map { compiler.compile(it) }
+				.toList()
+	}
+
+	private fun notIgnored(path: Path) = !filters.any { it.matches(path) }
+}
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/PathFilter.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/PathFilter.kt
new file mode 100644
index 000000000..826f345b5
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/PathFilter.kt
@@ -0,0 +1,12 @@
+package io.gitlab.arturbosch.detekt.core
+
+import java.nio.file.Path
+
+/**
+ * @author Artur Bosch
+ */
+class PathFilter(val regex: String) {
+	fun matches(path: Path): Boolean {
+		return path.toAbsolutePath().toString().matches(Regex(regex))
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/DebugRuleSetProvider.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/DebugRuleSetProvider.kt
new file mode 100644
index 000000000..d9b4674e9
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/DebugRuleSetProvider.kt
@@ -0,0 +1,16 @@
+package io.gitlab.arturbosch.detekt.core.debug
+
+import io.gitlab.arturbosch.detekt.api.RuleSet
+import io.gitlab.arturbosch.detekt.api.RuleSetProvider
+
+/**
+ * @author Artur Bosch
+ */
+object DebugRuleSetProvider : RuleSetProvider {
+	override fun instance(): RuleSet {
+		return RuleSet("debug", listOf(
+				ElementPrinter(),
+				TokenPrinter()
+		))
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/ElementPrinter.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/ElementPrinter.kt
new file mode 100644
index 000000000..dbc5a5484
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/ElementPrinter.kt
@@ -0,0 +1,16 @@
+package io.gitlab.arturbosch.detekt.core.debug
+
+import com.intellij.psi.PsiElement
+import io.gitlab.arturbosch.detekt.api.Rule
+import io.gitlab.arturbosch.detekt.print
+
+/**
+ * @author Artur Bosch
+ */
+class ElementPrinter : Rule("ElementPrinter") {
+
+	override fun visitElement(element: PsiElement) {
+		element.print()
+	}
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/TokenPrinter.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/TokenPrinter.kt
new file mode 100644
index 000000000..f74771c6e
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/core/debug/TokenPrinter.kt
@@ -0,0 +1,16 @@
+package io.gitlab.arturbosch.detekt.core.debug
+
+import com.intellij.lang.ASTNode
+import io.gitlab.arturbosch.detekt.api.TokenRule
+import io.gitlab.arturbosch.detekt.print
+
+/**
+ * @author Artur Bosch
+ */
+class TokenPrinter : TokenRule("TokenPrinter") {
+
+	override fun procedure(node: ASTNode) {
+		node.print()
+	}
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/default/CodeSmellProvider.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/default/CodeSmellProvider.kt
new file mode 100644
index 000000000..3dbad9ca9
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/default/CodeSmellProvider.kt
@@ -0,0 +1,20 @@
+package io.gitlab.arturbosch.detekt.default
+
+import io.gitlab.arturbosch.detekt.api.RuleSet
+import io.gitlab.arturbosch.detekt.api.RuleSetProvider
+import io.gitlab.arturbosch.detekt.rules.LargeClass
+import io.gitlab.arturbosch.detekt.rules.LongMethod
+import io.gitlab.arturbosch.detekt.rules.LongParameterList
+
+/**
+ * @author Artur Bosch
+ */
+class CodeSmellProvider : RuleSetProvider {
+	override fun instance(): RuleSet {
+		return RuleSet("code-smell", listOf(
+				LongParameterList(),
+				LongMethod(),
+				LargeClass()
+		))
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/default/StyleGuideProvider.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/default/StyleGuideProvider.kt
new file mode 100644
index 000000000..1546199b5
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/default/StyleGuideProvider.kt
@@ -0,0 +1,18 @@
+package io.gitlab.arturbosch.detekt.default
+
+import io.gitlab.arturbosch.detekt.api.RuleSet
+import io.gitlab.arturbosch.detekt.api.RuleSetProvider
+import io.gitlab.arturbosch.detekt.rules.NoElseInWhenExpression
+import io.gitlab.arturbosch.detekt.rules.WildcardImport
+
+/**
+ * @author Artur Bosch
+ */
+class StyleGuideProvider : RuleSetProvider {
+	override fun instance(): RuleSet {
+		return RuleSet("style", listOf(
+				WildcardImport(),
+				NoElseInWhenExpression()
+		))
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/Junk.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/Junk.kt
new file mode 100644
index 000000000..43a06c504
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/Junk.kt
@@ -0,0 +1,10 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import org.jetbrains.kotlin.psi.KtBlockExpression
+import org.jetbrains.kotlin.psi.KtExpression
+
+/**
+ * @author Artur Bosch
+ */
+
+fun KtExpression?.asBlockExpression(): KtBlockExpression? = if (this is KtBlockExpression) this else null
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LargeClass.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LargeClass.kt
new file mode 100644
index 000000000..4321fd1b0
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LargeClass.kt
@@ -0,0 +1,87 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Location
+import io.gitlab.arturbosch.detekt.api.MetricThresholdCodeSmellRule
+import org.jetbrains.kotlin.psi.KtBlockExpression
+import org.jetbrains.kotlin.psi.KtCallExpression
+import org.jetbrains.kotlin.psi.KtClassOrObject
+import org.jetbrains.kotlin.psi.KtIfExpression
+import org.jetbrains.kotlin.psi.KtLoopExpression
+import org.jetbrains.kotlin.psi.KtNamedFunction
+import org.jetbrains.kotlin.psi.KtTryExpression
+import org.jetbrains.kotlin.psi.KtWhenEntry
+import org.jetbrains.kotlin.psi.KtWhenExpression
+
+/**
+ * @author Artur Bosch
+ */
+class LargeClass(threshold: Int = 70) : MetricThresholdCodeSmellRule("LargeClass", threshold) {
+
+	private var loc = 0
+
+	private fun inc() {
+		loc += 1
+	}
+
+	override fun visitClassOrObject(classOrObject: KtClassOrObject) {
+		loc = 0
+		classOrObject.getBody()?.let {
+			loc += it.declarations.size
+		}
+		inc()
+		super.visitClassOrObject(classOrObject)
+		if (loc > 70) {
+			addFindings(CodeSmell(id, Location.of(classOrObject)))
+		}
+	}
+
+	override fun visitNamedFunction(function: KtNamedFunction) {
+		val body: KtBlockExpression? = function.bodyExpression.asBlockExpression()
+		body?.let {
+			loc += body.statements.size
+		}
+		super.visitNamedFunction(function)
+	}
+
+	override fun visitIfExpression(expression: KtIfExpression) {
+		expression.then?.let {
+			loc += it.children.size
+		}
+		expression.`else`?.let {
+			loc += it.children.size
+		}
+		super.visitIfExpression(expression)
+	}
+
+	override fun visitLoopExpression(loopExpression: KtLoopExpression) {
+		loopExpression.body?.let {
+			loc += it.children.size
+		}
+		super.visitLoopExpression(loopExpression)
+	}
+
+	override fun visitWhenExpression(expression: KtWhenExpression) {
+		loc += expression.children.filter { it is KtWhenEntry }.size
+		super.visitWhenExpression(expression)
+	}
+
+	override fun visitTryExpression(expression: KtTryExpression) {
+		loc += expression.tryBlock.statements.size
+		loc += expression.catchClauses.size
+		expression.catchClauses.map { it.catchBody?.children?.size }.forEach { loc += it ?: 0 }
+		expression.finallyBlock?.finalExpression?.statements?.size?.let { loc += it }
+		super.visitTryExpression(expression)
+	}
+
+	override fun visitCallExpression(expression: KtCallExpression) {
+		val lambdaArguments = expression.lambdaArguments
+		if (lambdaArguments.size > 0) {
+			val lambdaArgument = lambdaArguments[0]
+			lambdaArgument.getLambdaExpression().bodyExpression?.let {
+				loc += it.statements.size
+			}
+		}
+		super.visitCallExpression(expression)
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LongMethod.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LongMethod.kt
new file mode 100644
index 000000000..3bb54a8b1
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LongMethod.kt
@@ -0,0 +1,22 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Location
+import io.gitlab.arturbosch.detekt.api.MetricThresholdCodeSmellRule
+import org.jetbrains.kotlin.psi.KtBlockExpression
+import org.jetbrains.kotlin.psi.KtNamedFunction
+
+/**
+ * @author Artur Bosch
+ */
+class LongMethod(threshold: Int = 10) : MetricThresholdCodeSmellRule("LongMethod", threshold) {
+
+	override fun visitNamedFunction(function: KtNamedFunction) {
+		val body: KtBlockExpression? = function.bodyExpression.asBlockExpression()
+		body?.let {
+			val size = body.statements.size
+			if (size > threshold) addFindings(CodeSmell(id, Location.of(function)))
+		}
+		super.visitNamedFunction(function)
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LongParameterList.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LongParameterList.kt
new file mode 100644
index 000000000..e32f7e1ec
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/LongParameterList.kt
@@ -0,0 +1,18 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Location
+import io.gitlab.arturbosch.detekt.api.MetricThresholdCodeSmellRule
+import org.jetbrains.kotlin.psi.KtParameterList
+
+/**
+ * @author Artur Bosch
+ */
+class LongParameterList(threshold: Int = 5) : MetricThresholdCodeSmellRule("LongParameterList", threshold) {
+
+	override fun visitParameterList(list: KtParameterList) {
+		if (list.parameters.size > threshold) {
+			addFindings(CodeSmell(id, Location.of(list)))
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/NoElseInWhenExpression.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/NoElseInWhenExpression.kt
new file mode 100644
index 000000000..c85e536bc
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/NoElseInWhenExpression.kt
@@ -0,0 +1,17 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Location
+import io.gitlab.arturbosch.detekt.api.Rule
+import org.jetbrains.kotlin.psi.KtWhenExpression
+
+/**
+ * @author Artur Bosch
+ */
+class NoElseInWhenExpression : Rule("NoElseInWhenExpression", Severity.Defect) {
+
+	override fun visitWhenExpression(expression: KtWhenExpression) {
+		if (expression.elseExpression == null) addFindings(CodeSmell(id, Location.of(expression)))
+	}
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/WildcardImport.kt b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/WildcardImport.kt
new file mode 100644
index 000000000..f2f569798
--- /dev/null
+++ b/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/WildcardImport.kt
@@ -0,0 +1,20 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Location
+import io.gitlab.arturbosch.detekt.api.Rule
+import org.jetbrains.kotlin.psi.KtImportDirective
+
+/**
+ * @author Artur Bosch
+ */
+class WildcardImport : Rule("WildcardImport", Severity.Style) {
+
+	override fun visitImportDirective(importDirective: KtImportDirective) {
+		val import = importDirective.importPath?.pathStr
+		if (import != null && import.contains("*")) {
+			addFindings(CodeSmell(id, Location.of(importDirective)))
+		}
+	}
+}
+
diff --git a/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.RuleSetProvider b/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.RuleSetProvider
new file mode 100644
index 000000000..d56e40c59
--- /dev/null
+++ b/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.RuleSetProvider
@@ -0,0 +1,2 @@
+io.gitlab.arturbosch.detekt.default.CodeSmellProvider
+io.gitlab.arturbosch.detekt.default.StyleGuideProvider
\ No newline at end of file
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/KT.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/KT.kt
new file mode 100644
index 000000000..90609bdac
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/KT.kt
@@ -0,0 +1,30 @@
+package io.gitlab.arturbosch.detekt
+
+import com.intellij.lang.ASTNode
+import io.gitlab.arturbosch.detekt.api.Finding
+import io.gitlab.arturbosch.detekt.core.KtCompiler
+import java.nio.file.Path
+import java.nio.file.Paths
+
+/**
+ * @author Artur Bosch
+ */
+
+private val compiler = KtCompiler()
+
+enum class Case(val file: String) {
+	CasesFolder("/cases"),
+	Default("/cases/Default.kt"),
+	NestedLongMethods("/cases/NestedLongMethods.kt");
+
+	fun path(): Path = Paths.get(Case::class.java.getResource(file).path)
+}
+
+fun load(case: Case): ASTNode {
+	return compiler.compile(case.path()).node
+}
+
+fun Map.Entry<String, List<Finding>>.printFindings() {
+	key.print("Ruleset: ")
+	value.each { it.compact().print("\t") }
+}
\ No newline at end of file
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/core/DetektSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/core/DetektSpec.kt
new file mode 100644
index 000000000..1cd2c346d
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/core/DetektSpec.kt
@@ -0,0 +1,26 @@
+package io.gitlab.arturbosch.detekt.core
+
+import io.gitlab.arturbosch.detekt.Case
+import org.jetbrains.spek.api.Spek
+import org.jetbrains.spek.api.dsl.context
+import org.jetbrains.spek.api.dsl.describe
+import org.jetbrains.spek.api.dsl.it
+import kotlin.test.assertTrue
+
+/**
+ * @author Artur Bosch
+ */
+class DetektSpec : Spek({
+
+	context("default providers must be registered in META-INF/services") {
+		describe("run detekt on test cases with no additional rulesets") {
+
+			val detekt = Detekt(Case.CasesFolder.path())
+
+			it("should detect findings of more than one provider") {
+				assertTrue { detekt.run().size >= 1 }
+			}
+
+		}
+	}
+})
\ No newline at end of file
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/core/KtTreeCompilerSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/core/KtTreeCompilerSpec.kt
new file mode 100644
index 000000000..832bb8911
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/core/KtTreeCompilerSpec.kt
@@ -0,0 +1,33 @@
+package io.gitlab.arturbosch.detekt.core
+
+import io.gitlab.arturbosch.detekt.Case
+import org.jetbrains.spek.api.Spek
+import org.jetbrains.spek.api.dsl.describe
+import org.jetbrains.spek.api.dsl.it
+import kotlin.test.assertNull
+import kotlin.test.assertTrue
+
+/**
+ * @author Artur Bosch
+ */
+class KtTreeCompilerSpec : Spek({
+
+	describe("tree compiler functionality") {
+		it("should compile all files") {
+			val ktFiles = KtTreeCompiler(Case.CasesFolder.path()).compile()
+			assertTrue(ktFiles.size >= 2, "It should compile more than two files, but did ${ktFiles.size}")
+		}
+
+		it("should filter the file 'Default.kt'") {
+			val filter = PathFilter(".*Default.kt")
+			val ktFiles = KtTreeCompiler(Case.CasesFolder.path(), listOf(filter)).compile()
+			val ktFile = ktFiles.find { it.name == "Default.kt" }
+			assertNull(ktFile, "It should have no Default.kt file")
+		}
+
+		it("should also compile regular files") {
+			assertTrue { KtTreeCompiler(Case.Default.path()).compile().size == 1 }
+		}
+	}
+
+})
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/CommonSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/CommonSpec.kt
new file mode 100644
index 000000000..eacf9eb66
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/CommonSpec.kt
@@ -0,0 +1,25 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.Case
+import io.gitlab.arturbosch.detekt.api.Rule
+import io.gitlab.arturbosch.detekt.load
+import org.jetbrains.spek.api.SubjectSpek
+import org.jetbrains.spek.api.dsl.describe
+import org.jetbrains.spek.api.dsl.it
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+/**
+ * @author Artur Bosch
+ */
+class CommonSpec : SubjectSpek<Rule>({
+	subject { WildcardImport() }
+	val root = load(Case.Default)
+
+	describe("running specified rule") {
+		it("should detect one finding") {
+			subject.visit(root)
+			assertTrue(subject.findings.size == 1)
+		}
+	}
+})
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LargeClassSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LargeClassSpec.kt
new file mode 100644
index 000000000..d034005bb
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LargeClassSpec.kt
@@ -0,0 +1,12 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import org.jetbrains.spek.api.SubjectSpek
+import org.jetbrains.spek.api.dsl.itBehavesLike
+
+/**
+ * @author Artur Bosch
+ */
+class LargeClassSpec : SubjectSpek<LargeClass>({
+	subject { LargeClass() }
+	itBehavesLike(CommonSpec::class)
+})
\ No newline at end of file
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LongMethodSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LongMethodSpec.kt
new file mode 100644
index 000000000..8df71a265
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LongMethodSpec.kt
@@ -0,0 +1,23 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import io.gitlab.arturbosch.detekt.Case
+import io.gitlab.arturbosch.detekt.load
+import org.jetbrains.spek.api.SubjectSpek
+import org.jetbrains.spek.api.dsl.describe
+import org.jetbrains.spek.api.dsl.it
+import kotlin.test.assertEquals
+
+/**
+ * @author Artur Bosch
+ */
+class LongMethodSpec : SubjectSpek<LongMethod>({
+	subject { LongMethod() }
+
+	describe("nested functions can be long") {
+		it("should find two long methods") {
+			val root = load(Case.NestedLongMethods)
+			subject.visit(root)
+			assertEquals(subject.findings.size, 2)
+		}
+	}
+})
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LongParameterListSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LongParameterListSpec.kt
new file mode 100644
index 000000000..bc211f25d
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/LongParameterListSpec.kt
@@ -0,0 +1,12 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import org.jetbrains.spek.api.SubjectSpek
+import org.jetbrains.spek.api.dsl.itBehavesLike
+
+/**
+ * @author Artur Bosch
+ */
+class LongParameterListSpec : SubjectSpek<LongParameterList>({
+	subject { LongParameterList() }
+	itBehavesLike(CommonSpec::class)
+})
diff --git a/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/NoElseInWhenSpec.kt b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/NoElseInWhenSpec.kt
new file mode 100644
index 000000000..75b5d6f06
--- /dev/null
+++ b/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/NoElseInWhenSpec.kt
@@ -0,0 +1,12 @@
+package io.gitlab.arturbosch.detekt.rules
+
+import org.jetbrains.spek.api.SubjectSpek
+import org.jetbrains.spek.api.dsl.itBehavesLike
+
+/**
+ * @author Artur Bosch
+ */
+class NoElseInWhenSpec : SubjectSpek<NoElseInWhenExpression>({
+	subject { NoElseInWhenExpression() }
+	itBehavesLike(CommonSpec::class)
+})
\ No newline at end of file
diff --git a/src/test/resources/cases/Default.kt b/src/test/resources/cases/Default.kt
new file mode 100644
index 000000000..5196a6733
--- /dev/null
+++ b/src/test/resources/cases/Default.kt
@@ -0,0 +1,143 @@
+package cases
+
+import io.gitlab.arturbosch.detekt.print
+import java.util.*
+
+/**
+ * @author Artur Bosch
+ */
+@Suppress("unused")
+class Default {
+
+	/**
+	 * Used for wildcard import spec
+	 */
+	fun noop() {
+		ArrayList<Any>()
+	}
+
+	/**
+	 * 8, no else
+	 */
+	fun IfTHenElse() {
+		if (true) {
+			while (true) {
+				println("Loop")
+			}
+		} else {
+			println("NoLoop")
+			when ("string") {
+				"string" -> println("s")
+				else -> println("s")
+			}
+		}
+	}
+
+	fun NoElseInWhen() {
+		// no else in when
+		when(true) {
+			false -> print()
+		}
+	}
+
+	/**
+	 * 3
+	 */
+	fun letStatements() {
+		5.let {
+			it.print()
+		}
+	}
+
+	/**
+	 * 8, no finally
+	 */
+	fun tryStatements() {
+		try {
+			5.print()
+		} catch (e: Error) {
+			print(e)
+		} catch (ex: Error) {
+			print(ex)
+		} finally {
+			print("Finally")
+		}
+	}
+
+	/**
+	 * Used for LM and LPL spec
+	 * 11
+	 */
+	fun long(a: Int, b: Int, c: Int, d: Int, e: Int, s: String) {
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+	}
+
+	/**
+	 * 55
+	 */
+	fun forLargeClass() {
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+		println()
+	}
+}
\ No newline at end of file
diff --git a/src/test/resources/cases/NestedLongMethods.kt b/src/test/resources/cases/NestedLongMethods.kt
new file mode 100644
index 000000000..6f8a3bee1
--- /dev/null
+++ b/src/test/resources/cases/NestedLongMethods.kt
@@ -0,0 +1,33 @@
+package cases
+
+/**
+ * @author Artur Bosch
+ */
+@Suppress("unused")
+class NestedLongMethods {
+	fun long(a: Int, b: Int, c: Int, d: Int, e: Int, s: String) {
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		println("$a,$b,$c,$d,$e,$s")
+		fun localLPL(a: Int, b: Int, c: Int, d: Int, e: Int, s: String) {
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+			println("$a,$b,$c,$d,$e,$s")
+		}
+	}
+}
\ No newline at end of file