Add inspection that warns if Gradle plugin version differs from the one in IDE (KT-12730)

#KT-12730 Fixed

idea/testData/inspections/gradleWrongPluginVersion/fullHelloWorldConfiguration.gradle

@@ -0,0 +1,30 @@
+group 'OnlyGradleTest'
+version '1.0-SNAPSHOT'
+
+buildscript {
+  ext.kotlin_version = '0.0.1'
+
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+  }
+}
+
+
+apply plugin: 'groovy'
+apply plugin: 'java'
+apply plugin: 'kotlin'
+
+sourceCompatibility = 1.5
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+  compile 'org.codehaus.groovy:groovy-all:2.3.+'
+  testCompile group: 'junit', name: 'junit', version: '4.11'
+}

idea/testData/inspections/gradleWrongPluginVersion/inspectionData/expected.xml

@@ -0,0 +1,55 @@
+<problems>
+    <problem>
+        <file>wrongPluginVersionWithNumber.gradle</file>
+        <line>6</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="wrongPluginVersionWithNumber.gradle" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Kotlin Gradle and IDE plugins versions are different</problem_class>
+        <description>Kotlin version that is used for building with Gradle (0.0.1) differs from the one bundled into the IDE plugin ($PLUGIN_VERSION)</description>
+    </problem>
+
+    <problem>
+        <file>wrongPluginVersionWithStandardKotlinVariable.gradle</file>
+        <line>9</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="wrongPluginVersionWithStandardKotlinVariable.gradle" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Kotlin Gradle and IDE plugins versions are different</problem_class>
+        <description>Kotlin version that is used for building with Gradle (0.0.1) differs from the one bundled into the IDE plugin ($PLUGIN_VERSION)</description>
+    </problem>
+
+    <problem>
+        <file>fullHelloWorldConfiguration.gradle</file>
+        <line>11</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="fullHelloWorldConfiguration.gradle" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Kotlin Gradle and IDE plugins versions are different</problem_class>
+        <description>Kotlin version that is used for building with Gradle (0.0.1) differs from the one bundled into the IDE plugin ($PLUGIN_VERSION)</description>
+    </problem>
+
+    <problem>
+        <file>wrongPluginVersionWithSomeVariable.gradle</file>
+        <line>9</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="wrongPluginVersionWithSomeVariable.gradle" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Kotlin Gradle and IDE plugins versions are different</problem_class>
+        <description>Kotlin version that is used for building with Gradle (0.0.1) differs from the one bundled into the IDE plugin ($PLUGIN_VERSION)</description>
+    </problem>
+
+    <problem>
+        <file>wrongPluginVersionWithSomeVariableInDef.gradle</file>
+        <line>9</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="wrongPluginVersionWithSomeVariableInDef.gradle" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Kotlin Gradle and IDE plugins versions are different</problem_class>
+        <description>Kotlin version that is used for building with Gradle (0.0.1) differs from the one bundled into the IDE plugin ($PLUGIN_VERSION)</description>
+    </problem>
+
+    <problem>
+        <file>wrongPluginVersionWithVariableAndFullInterpolation.gradle</file>
+        <line>9</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="wrongPluginVersionWithVariableAndFullInterpolation.gradle" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Kotlin Gradle and IDE plugins versions are different</problem_class>
+        <description>Kotlin version that is used for building with Gradle (0.0.1) differs from the one bundled into the IDE plugin ($PLUGIN_VERSION)</description>
+    </problem>
+</problems>

idea/testData/inspections/gradleWrongPluginVersion/inspectionData/inspections.test

@@ -0,0 +1 @@
+// INSPECTION_CLASS: org.jetbrains.kotlin.idea.inspections.gradle.DifferentKotlinGradleVersionInspection

idea/testData/inspections/gradleWrongPluginVersion/noWrongPluginVersionOnGoodConfig.gradle

@@ -0,0 +1,11 @@
+buildscript {
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$PLUGIN_VERSION"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/noWrongPluginVersionOnNoKotlinPlugin.gradle

@@ -0,0 +1,17 @@
+buildscript {
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath "org.jetbrains.kotlin:something-kotlin-gradle-plugin:0.0.1"
+    classpath "someone:kotlin-gradle-plugin:0.0.1"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'
+
+dependencies {
+  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:0.0.1" // Bad position for plugin
+  classpath "someone:kotlin-gradle-plugin:0.0.1"
+}

idea/testData/inspections/gradleWrongPluginVersion/noWrongPluginVersionOnNoVersion.gradle

@@ -0,0 +1,11 @@
+buildscript {
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/noWrongPluginVersionWhenSuppressed.gradle

@@ -0,0 +1,12 @@
+buildscript {
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    //noinspection DifferentKotlinGradleVersion
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:0.0.1"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/wrongPluginVersionWithNumber.gradle

@@ -0,0 +1,11 @@
+buildscript {
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:0.0.1"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/wrongPluginVersionWithSomeVariable.gradle

@@ -0,0 +1,14 @@
+buildscript {
+  ext.some = '0.0.1'
+
+  repositories {
+    mavenCentral()
+  }
+
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$some"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/wrongPluginVersionWithSomeVariableInDef.gradle

@@ -0,0 +1,14 @@
+buildscript {
+  def defVar = '0.0.1'
+
+  repositories {
+    mavenCentral()
+  }
+
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$defVar"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/wrongPluginVersionWithStandardKotlinVariable.gradle

@@ -0,0 +1,14 @@
+buildscript {
+  ext.kotlin_version = '0.0.1'
+
+  repositories {
+    mavenCentral()
+  }
+
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'

idea/testData/inspections/gradleWrongPluginVersion/wrongPluginVersionWithVariableAndFullInterpolation.gradle

@@ -0,0 +1,14 @@
+buildscript {
+  ext.t = '0.0.1'
+
+  repositories {
+    mavenCentral()
+  }
+
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${t}"
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'kotlin'