Introduce live templates for main without arguments #KT-27461 Fixed

idea/idea-live-templates/src/org/jetbrains/kotlin/idea/liveTemplates/macro/KotlinMainArgumentsMacro.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.liveTemplates.macro
+
+import com.intellij.codeInsight.template.Expression
+import com.intellij.codeInsight.template.ExpressionContext
+import com.intellij.codeInsight.template.Result
+import com.intellij.codeInsight.template.TextResult
+import org.jetbrains.kotlin.config.LanguageFeature
+import org.jetbrains.kotlin.idea.project.languageVersionSettings
+
+class KotlinMainArgumentsMacro : KotlinMacro() {
+    override fun getName() = "kotlinMainArguments"
+    override fun getPresentableName() = "kotlinMainArguments()"
+
+    override fun calculateResult(params: Array<Expression>, context: ExpressionContext): Result? {
+        val languageVersionSettings = context.psiElementAtStartOffset?.languageVersionSettings ?: return null
+        if (languageVersionSettings.supportsFeature(LanguageFeature.ExtendedMainConvention)) return TextResult("")
+        return TextResult("args: Array<String>")
+    }
+}

idea/idea-live-templates/testData/main.exp.kt

@@ -1,3 +1,3 @@
-fun main(args: Array<String>) {
+fun main() {
     <caret>
 }

idea/idea-live-templates/testData/maina.exp.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    <caret>
+}

idea/idea-live-templates/testData/maina.kt

@@ -0,0 +1 @@
+<caret>

idea/idea-live-templates/tests/org/jetbrains/kotlin/idea/liveTemplates/LiveTemplatesTest.kt

@@ -72,6 +72,10 @@ class LiveTemplatesTest : KotlinLightCodeInsightFixtureTestCase() {
         paremeterless()
     }
 
+    fun testMaina() {
+        paremeterless()
+    }
+
     fun testSoutv() {
         start()