Do not use "Remove redundant '.let' call" when receiver is used #KT-14390 Fixed

idea/src/org/jetbrains/kotlin/idea/intentions/ReplaceSingleLineLetIntention.kt

@@ -17,12 +17,10 @@
 package org.jetbrains.kotlin.idea.intentions
 
 import com.intellij.openapi.editor.Editor
-import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.inspections.IntentionBasedInspection
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
+import org.jetbrains.kotlin.psi.psiUtil.anyDescendantOfType
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
 
 class ReplaceSingleLineLetInspection : IntentionBasedInspection<KtCallExpression>(ReplaceSingleLineLetIntention::class) {
     override fun inspectionTarget(element: KtCallExpression) = element.calleeExpression
@@ -66,6 +64,9 @@ class ReplaceSingleLineLetIntention : SelfTargetingOffsetIndependentIntention<Kt
         val parameterName = lambdaExpression.getParameterName() ?: return false
         val receiverExpression = dotQualifiedExpression.getLeftMostReceiverExpression()
         if (receiverExpression.text != parameterName) return false
+        dotQualifiedExpression.selectorExpression?.let {
+            if (it.anyDescendantOfType<KtLambdaExpression>()) return false
+        }
         return !dotQualifiedExpression.receiverUsedAsArgument(parameterName)
     }
 
@@ -79,7 +80,15 @@ class ReplaceSingleLineLetIntention : SelfTargetingOffsetIndependentIntention<Kt
     }
 
     private fun KtDotQualifiedExpression.receiverUsedAsArgument(receiverName: String): Boolean {
-        if ((selectorExpression as? KtCallExpression)?.valueArguments?.firstOrNull { it.text == receiverName } != null) return true
+        (selectorExpression as? KtCallExpression)?.valueArguments?.let {
+            if (it.any { it.receiverUsedAsArgument(receiverName) }) return true
+        }
         return (receiverExpression as? KtDotQualifiedExpression)?.receiverUsedAsArgument(receiverName) ?: false
     }
+
+    private fun KtValueArgument.receiverUsedAsArgument(receiverName: String) =
+            text == receiverName || anyDescendantOfType<KtDotQualifiedExpression> {
+                it.getLeftMostReceiverExpression().text == receiverName ||
+                it.receiverUsedAsArgument(receiverName)
+            }
 }

idea/testData/intentions/replaceSingleLineLetIntention/multipleReceiver.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+
+fun baz(foo: String) {
+    foo.let<caret> { it.substringAfterLast(it.capitalize()) }
+}

idea/testData/intentions/replaceSingleLineLetIntention/multipleReceiver2.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+
+fun baz(foo: String) {
+    foo.let<caret> { it.substringAfterLast("".equals(it).toString()) }
+}

idea/testData/intentions/replaceSingleLineLetIntention/multipleReceiver3.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+
+fun baz(foo: String) {
+    foo.let<caret> { it.substring(0, it.length) }
+}

idea/testData/intentions/replaceSingleLineLetIntention/receiverWithLambda.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+
+fun baz(foo: String) {
+    foo.let<caret> { it.indexOfLast { c -> c == it[0] } }
+}

idea/testData/intentions/replaceSingleLineLetIntention/receiverWithLambda2.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+// This should be reported. However, in order to avoid too complecate logic, the intention ignore this case.
+
+import java.util.*
+
+fun baz2(foo: List<String>) {
+    foo.let<caret> { it.binarySearch("", Comparator<kotlin.String> { o1, o2 -> 0 }) }
+}

idea/tests/org/jetbrains/kotlin/idea/intentions/IntentionTestGenerated.java

@@ -11768,6 +11768,36 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("multipleReceiver.kt")
+        public void testMultipleReceiver() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/replaceSingleLineLetIntention/multipleReceiver.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("multipleReceiver2.kt")
+        public void testMultipleReceiver2() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/replaceSingleLineLetIntention/multipleReceiver2.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("multipleReceiver3.kt")
+        public void testMultipleReceiver3() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/replaceSingleLineLetIntention/multipleReceiver3.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("receiverWithLambda.kt")
+        public void testReceiverWithLambda() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/replaceSingleLineLetIntention/receiverWithLambda.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("receiverWithLambda2.kt")
+        public void testReceiverWithLambda2() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/replaceSingleLineLetIntention/receiverWithLambda2.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("sameLets.kt")
         public void testSameLets() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/replaceSingleLineLetIntention/sameLets.kt");