Add KtLint.

src/main/groovy/com/vanniktech/code/quality/tools/CodeQualityToolsPlugin.groovy

@@ -5,6 +5,7 @@ import org.gradle.api.Project
 import org.gradle.api.plugins.quality.Checkstyle
 import org.gradle.api.plugins.quality.FindBugs
 import org.gradle.api.plugins.quality.Pmd
+import org.gradle.api.tasks.JavaExec
 
 class CodeQualityToolsPlugin implements Plugin<Project> {
     @Override
@@ -14,6 +15,7 @@ class CodeQualityToolsPlugin implements Plugin<Project> {
         rootProject.codeQualityTools.extensions.create('checkstyle', CodeQualityToolsPluginExtension.Checkstyle)
         rootProject.codeQualityTools.extensions.create('pmd', CodeQualityToolsPluginExtension.Pmd)
         rootProject.codeQualityTools.extensions.create('lint', CodeQualityToolsPluginExtension.Lint)
+        rootProject.codeQualityTools.extensions.create('ktlint', CodeQualityToolsPluginExtension.Ktlint)
 
         rootProject.subprojects { subProject ->
             afterEvaluate {
@@ -25,6 +27,7 @@ class CodeQualityToolsPlugin implements Plugin<Project> {
                     addCheckstyle(subProject, rootProject, extension)
                     addFindbugs(subProject, rootProject, extension)
                     addLint(subProject, extension)
+                    addKtlint(subProject, extension)
                 }
             }
         }
@@ -170,6 +173,36 @@ class CodeQualityToolsPlugin implements Plugin<Project> {
         return false
     }
 
+    protected static boolean addKtlint(final Project subProject, final CodeQualityToolsPluginExtension extension) {
+        if (!shouldIgnore(subProject, extension) && extension.ktlint.enabled) {
+            subProject.configurations {
+                ktlint
+            }
+
+            subProject.dependencies {
+                ktlint "com.github.shyiko:ktlint:${extension.ktlint.toolVersion}"
+            }
+
+            subProject.task('ktlint', type: JavaExec) {
+                main = "com.github.shyiko.ktlint.Main"
+                classpath = subProject.configurations.ktlint
+                args "src/**/*.kt"
+            }
+
+            subProject.task('ktlintFormat', type: JavaExec) {
+                main = "com.github.shyiko.ktlint.Main"
+                classpath = subProject.configurations.ktlint
+                args "-F", "src/**/*.kt"
+            }
+
+            subProject.check.dependsOn 'ktlint'
+
+            return true
+        }
+
+        return false
+    }
+
     protected static boolean isAndroidProject(final Project project) {
         final boolean isAndroidLibrary = project.plugins.hasPlugin('com.android.library')
         final boolean isAndroidApp = project.plugins.hasPlugin('com.android.application')

src/main/groovy/com/vanniktech/code/quality/tools/CodeQualityToolsPluginExtension.groovy

@@ -165,4 +165,15 @@ class CodeQualityToolsPluginExtension {
          */
         String baselineFileName = null
     }
+
+    static class Ktlint {
+        /**
+         * ability to enable or disable only ktlint for every subproject that is not ignored
+         * @since 0.5.0
+         */
+        boolean enabled = true
+
+        /** @since 0.5.0 */
+        String toolVersion = '0.8.3'
+    }
 }

src/test/groovy/com/vanniktech/code/quality/tools/CodeQualityToolsPluginExceptionForTests.groovy

@@ -9,4 +9,5 @@ class CodeQualityToolsPluginExceptionForTests extends CodeQualityToolsPluginExte
     CodeQualityToolsPluginExtension.Checkstyle checkstyle = new CodeQualityToolsPluginExtension.Checkstyle()
     CodeQualityToolsPluginExtension.Pmd pmd = new CodeQualityToolsPluginExtension.Pmd()
     CodeQualityToolsPluginExtension.Lint lint = new CodeQualityToolsPluginExtension.Lint()
-}
+    CodeQualityToolsPluginExtension.Ktlint ktlint = new CodeQualityToolsPluginExtension.Ktlint()
+}

src/test/groovy/com/vanniktech/code/quality/tools/CodeQualityToolsPluginExtensionTest.groovy

@@ -11,6 +11,7 @@ class CodeQualityToolsPluginExtensionTest {
         assert extension.xmlReports
         assert !extension.htmlReports
 
+        assert extension.ktlint.toolVersion == '0.8.3'
         assert extension.findbugs.toolVersion == '3.0.1'
         assert extension.checkstyle.toolVersion == '7.6'
         assert extension.pmd.toolVersion == '5.5.4'
@@ -36,6 +37,7 @@ class CodeQualityToolsPluginExtensionTest {
 
         assert extension.ignoreProjects.size() == 0
 
+        assert extension.ktlint.enabled
         assert extension.lint.enabled
         assert extension.findbugs.enabled
         assert extension.checkstyle.enabled

src/test/groovy/com/vanniktech/code/quality/tools/CodeQualityToolsPluginKtlintTest.groovy

@@ -0,0 +1,55 @@
+package com.vanniktech.code.quality.tools
+
+import org.gradle.api.Project
+import org.junit.Ignore
+import org.junit.Test
+
+public class CodeQualityToolsPluginKtlintTest extends CommonCodeQualityToolsTest {
+  @Test public void javaDefault() {
+    assert CodeQualityToolsPlugin.addKtlint(javaProject, new CodeQualityToolsPluginExceptionForTests())
+
+    assertKtlint(javaProject)
+  }
+
+  @Test @Ignore("buildToolsVersion is not specified.") public void androidAppDefault() {
+    assert CodeQualityToolsPlugin.addKtlint(androidAppProject, new CodeQualityToolsPluginExceptionForTests())
+
+    assertKtlint(androidAppProject)
+  }
+
+  @Test @Ignore("buildToolsVersion is not specified.") public void androidLibraryDefault() {
+    assert CodeQualityToolsPlugin.addKtlint(androidLibraryProject, new CodeQualityToolsPluginExceptionForTests())
+
+    assertKtlint(androidLibraryProject)
+  }
+
+  private static void assertKtlint(Project project) {
+    def ktlint = project.configurations.getByName('ktlint').dependencies[0]
+    assert ktlint.group == 'com.github.shyiko'
+    assert ktlint.name == 'ktlint'
+    assert ktlint.version == '0.8.3'
+    assert taskDependsOn(project.check, 'ktlint')
+    assert project.getTasksByName('ktlintFormat', false).size() == 1
+  }
+
+  @Test public void configurations() {
+    def extension = new CodeQualityToolsPluginExceptionForTests()
+    extension.ktlint.toolVersion = '0.8.2'
+
+    assert CodeQualityToolsPlugin.addKtlint(androidLibraryProject, extension)
+
+    def ktlint = androidLibraryProject.configurations.getByName('ktlint').dependencies[0]
+    assert ktlint.group == 'com.github.shyiko'
+    assert ktlint.name == 'ktlint'
+    assert ktlint.version == '0.8.2'
+  }
+
+  @Test public void enabled() {
+    def extension = new CodeQualityToolsPluginExceptionForTests()
+    extension.ktlint.enabled = false
+
+    for (def project : projects) {
+      assert !CodeQualityToolsPlugin.addKtlint(project, extension)
+    }
+  }
+}

src/test/groovy/com/vanniktech/code/quality/tools/CodeQualityToolsPluginTest.groovy

@@ -1,36 +1,10 @@
 package com.vanniktech.code.quality.tools
 
 import org.gradle.api.Project
-import org.gradle.api.Task
 import org.gradle.api.plugins.quality.*
-import org.gradle.testfixtures.ProjectBuilder
-import org.junit.Before
 import org.junit.Test
 
-public class CodeQualityToolsPluginTest {
-    private Project rootProject
-    private Project javaProject
-    private Project androidAppProject
-    private Project androidLibraryProject
-
-    private Project[] projects
-
-    @Before
-    public void setUp() {
-        rootProject = ProjectBuilder.builder().withName('root').build()
-
-        javaProject = ProjectBuilder.builder().withName('java').withParent(rootProject).build()
-        javaProject.plugins.apply('java')
-
-        androidAppProject = ProjectBuilder.builder().withName('android app').build()
-        androidAppProject.plugins.apply('com.android.application')
-
-        androidLibraryProject = ProjectBuilder.builder().withName('android library').build()
-        androidLibraryProject.plugins.apply('com.android.library')
-
-        projects = [javaProject, androidAppProject, androidLibraryProject]
-    }
-
+public class CodeQualityToolsPluginTest extends CommonCodeQualityToolsTest {
     @Test
     public void testAddFindbugsJavaDefault() {
         assert CodeQualityToolsPlugin.addFindbugs(javaProject, rootProject, new CodeQualityToolsPluginExceptionForTests())
@@ -205,7 +179,7 @@ public class CodeQualityToolsPluginTest {
         assertLint(androidLibraryProject)
     }
 
-    private void assertLint(Project project) {
+    private static void assertLint(Project project) {
         assert project.android.lintOptions.warningsAsErrors
         assert project.android.lintOptions.abortOnError
         assert !project.android.lintOptions.textReport
@@ -644,18 +618,4 @@ public class CodeQualityToolsPluginTest {
         assert CodeQualityToolsPlugin.isAndroidProject(androidLibraryProject)
         assert !CodeQualityToolsPlugin.isAndroidProject(javaProject)
     }
-
-    static boolean taskDependsOn(final Task task, final String taskName) {
-        def it = task.dependsOn.iterator()
-
-        while (it.hasNext()) {
-            def item = it.next()
-
-            if (item.toString().equals(taskName)) {
-                return  true
-            }
-        }
-
-        return false
-    }
 }

src/test/groovy/com/vanniktech/code/quality/tools/CommonCodeQualityToolsTest.groovy

@@ -0,0 +1,44 @@
+package com.vanniktech.code.quality.tools
+
+import org.gradle.api.Project
+import org.gradle.api.Task
+import org.gradle.testfixtures.ProjectBuilder
+import org.junit.Before
+
+public abstract class CommonCodeQualityToolsTest {
+  Project rootProject
+  Project javaProject
+  Project androidAppProject
+  Project androidLibraryProject
+
+  Project[] projects
+
+  @Before public void setUp() {
+    rootProject = ProjectBuilder.builder().withName('root').build()
+
+    javaProject = ProjectBuilder.builder().withName('java').withParent(rootProject).build()
+    javaProject.plugins.apply('java')
+
+    androidAppProject = ProjectBuilder.builder().withName('android app').build()
+    androidAppProject.plugins.apply('com.android.application')
+
+    androidLibraryProject = ProjectBuilder.builder().withName('android library').build()
+    androidLibraryProject.plugins.apply('com.android.library')
+
+    projects = [javaProject, androidAppProject, androidLibraryProject]
+  }
+
+  static boolean taskDependsOn(final Task task, final String taskName) {
+    def it = task.dependsOn.iterator()
+
+    while (it.hasNext()) {
+      def item = it.next()
+
+      if (item.toString().equals(taskName)) {
+        return  true
+      }
+    }
+
+    return false
+  }
+}