Reduce boilerplate for applying kotlin-gradle-plugin.

Interop/Indexer/build.gradle

@@ -15,13 +15,7 @@
  */
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-   dependencies {
-     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-   }
 }
 
 apply plugin: 'kotlin'

Interop/Runtime/build.gradle

@@ -15,13 +15,7 @@
  */
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-   dependencies {
-     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-   }
 }
 
 apply plugin: 'kotlin'

Interop/StubGenerator/build.gradle

@@ -15,13 +15,7 @@
  */
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-   dependencies {
-     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-   }
 }
 
 apply plugin: 'kotlin'

backend.native/bc.frontend/build.gradle

@@ -16,12 +16,8 @@
 
 buildscript {
    ext.kotlin_version = '1.0.3'
-   repositories {
+
-       mavenCentral()
+   apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-   }
-   dependencies {
-       classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.0.3"
-   }
 }
 apply plugin: 'java'
 apply plugin: 'kotlin'

backend.native/build.gradle

@@ -15,15 +15,15 @@
  */
 
 buildscript {
+   apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
+
    repositories {
        mavenCentral()
    }
 
    dependencies {
-       classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
    }
-
 }
 
 String protobufVersion = '2.6.1'

buildSrc/shared/build.gradle

@@ -21,13 +21,7 @@ buildscript {
         kotlin_version = gradleProperties."kotlin_version"
     }
 
-    repositories {
+    apply from: '../../gradle/kotlinGradlePlugin.gradle'
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
 }
 
 apply plugin: 'kotlin'

dependencies/build.gradle

@@ -21,13 +21,13 @@ import org.jetbrains.kotlin.konan.properties.KonanProperties
 import org.jetbrains.kotlin.konan.properties.*
 
 buildscript {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
+
     repositories {
-        mavenCentral()
         jcenter()
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3'
     }
 }

gradle/kotlinGradlePlugin.gradle

@@ -0,0 +1,11 @@
+if (!hasProperty('kotlin_version')) {
+    throw new GradleException('Please ensure the "kotlin_version" property is defined before applying this script.')
+}
+
+project.buildscript.repositories {
+    mavenCentral()
+}
+
+project.buildscript.dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+}

klib/build.gradle

@@ -15,13 +15,7 @@
  */
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-   dependencies {
-     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-   }
 }
 
 apply plugin: 'kotlin'

performance/build.gradle

@@ -1,6 +1,9 @@
 buildscript {
+    ext.kotlin_version = '+'
+
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
+
     repositories {
-        mavenCentral()
         maven {
             url "https://dl.bintray.com/jetbrains/kotlin-native-dependencies"
         }
@@ -8,7 +11,6 @@ buildscript {
 
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-native-gradle-plugin:+"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:+"
     }
 }
 

shared/build.gradle

@@ -15,13 +15,7 @@
  */
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-   dependencies {
-     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-   }
 }
 
 apply plugin: 'kotlin'

tools/helpers/build.gradle

@@ -22,13 +22,7 @@ import org.jetbrains.kotlin.TestFailedException
 import java.util.concurrent.atomic.AtomicInteger
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
 }
 
 // Copied from backend.native project. =====

tools/kotlin-native-gradle-plugin/build.gradle

@@ -4,13 +4,13 @@
  */
 
 buildscript {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
+
     repositories {
-        mavenCentral()
         jcenter()
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3'
     }
 }

utilities/build.gradle

@@ -15,13 +15,7 @@
  */
 
 buildscript {
-    repositories {
+    apply from: "$rootDir/gradle/kotlinGradlePlugin.gradle"
-        mavenCentral()
-    }
-
-   dependencies {
-     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-   }
 }
 
 apply plugin: 'kotlin'