Add quick-fixes for lateinit-related errors #KT-14342 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeVariableMutabilityFix.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.diagnostics.DiagnosticFactory1
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
 
 class ChangeVariableMutabilityFix(element: KtValVarKeywordOwner, private val makeVar: Boolean) : KotlinQuickFixAction<KtValVarKeywordOwner>(element) {
@@ -81,5 +82,14 @@ class ChangeVariableMutabilityFix(element: KtValVarKeywordOwner, private val mak
                 return ChangeVariableMutabilityFix(element, false)
             }
         }
+
+        val LATEINIT_VAL_FACTORY = object: KotlinSingleIntentionActionFactory() {
+            override fun createAction(diagnostic: Diagnostic): IntentionAction? {
+                val lateinitElement = Errors.INAPPLICABLE_LATEINIT_MODIFIER.cast(diagnostic).psiElement
+                val property = lateinitElement.getStrictParentOfType<KtProperty>() ?: return null
+                if (property.valOrVarKeyword.text != "val") return null
+                return ChangeVariableMutabilityFix(property, makeVar = true)
+            }
+        }
     }
 }

idea/src/org/jetbrains/kotlin/idea/quickfix/QuickFixRegistrar.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -434,5 +434,8 @@ class QuickFixRegistrar : QuickFixContributor {
         UNUSED_VALUE.registerFactory(RemoveUnusedValueFix)
 
         ANNOTATIONS_ON_BLOCK_LEVEL_EXPRESSION_ON_THE_SAME_LINE.registerFactory(AddNewLineAfterAnnotationsFix)
+
+        INAPPLICABLE_LATEINIT_MODIFIER.registerFactory(ChangeVariableMutabilityFix.LATEINIT_VAL_FACTORY)
+        INAPPLICABLE_LATEINIT_MODIFIER.registerFactory(RemoveNullableFix.LATEINIT_FACTORY)
     }
 }

idea/src/org/jetbrains/kotlin/idea/quickfix/RemoveNullableFix.kt

@@ -19,16 +19,20 @@ package org.jetbrains.kotlin.idea.quickfix
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.diagnostics.Diagnostic
+import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtNullableType
+import org.jetbrains.kotlin.psi.KtProperty
 import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
+import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 
 class RemoveNullableFix(element: KtNullableType,
                         private val typeOfError: RemoveNullableFix.NullableKind) : KotlinQuickFixAction<KtNullableType>(element) {
     enum class NullableKind(val message: String) {
         REDUNDANT("Remove redundant '?'"),
         SUPERTYPE("Remove '?'"),
-        USELESS("Remove useless '?'")
+        USELESS("Remove useless '?'"),
+        PROPERTY("Make not-nullable")
     }
 
     override fun getFamilyName() = "Remove '?'"
@@ -47,4 +51,15 @@ class RemoveNullableFix(element: KtNullableType,
             return RemoveNullableFix(nullType, typeOfError)
         }
     }
+
+    object LATEINIT_FACTORY : KotlinSingleIntentionActionFactory() {
+        override fun createAction(diagnostic: Diagnostic): KotlinQuickFixAction<KtNullableType>? {
+            val lateinitElement = Errors.INAPPLICABLE_LATEINIT_MODIFIER.cast(diagnostic).psiElement
+            val property = lateinitElement.getStrictParentOfType<KtProperty>() ?: return null
+            val typeReference = property.typeReference ?: return null
+            val typeElement = (typeReference.typeElement ?: return null) as? KtNullableType ?: return null
+            if (typeElement.innerType == null) return null
+            return RemoveNullableFix(typeElement, NullableKind.PROPERTY)
+        }
+    }
 }

idea/testData/quickfix/lateinit/nullable.kt

@@ -0,0 +1,5 @@
+// "Make not-nullable" "true"
+
+class A() {
+    <caret>lateinit var foo: String?
+}

idea/testData/quickfix/lateinit/nullable.kt.after

@@ -0,0 +1,5 @@
+// "Make not-nullable" "true"
+
+class A() {
+    <caret>lateinit var foo: String
+}

idea/testData/quickfix/lateinit/val.kt

@@ -0,0 +1,5 @@
+// "Make variable mutable" "true"
+
+class A() {
+    <caret>lateinit val foo: String
+}

idea/testData/quickfix/lateinit/val.kt.after

@@ -0,0 +1,5 @@
+// "Make variable mutable" "true"
+
+class A() {
+    <caret>lateinit var foo: String
+}

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -5675,6 +5675,27 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
         }
     }
 
+    @TestMetadata("idea/testData/quickfix/lateinit")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class Lateinit extends AbstractQuickFixTest {
+        public void testAllFilesPresentInLateinit() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/quickfix/lateinit"), Pattern.compile("^([\\w\\-_]+)\\.kt$"), true);
+        }
+
+        @TestMetadata("nullable.kt")
+        public void testNullable() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/quickfix/lateinit/nullable.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("val.kt")
+        public void testVal() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/quickfix/lateinit/val.kt");
+            doTest(fileName);
+        }
+    }
+
     @TestMetadata("idea/testData/quickfix/leakingThis")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)