KT-1673 Respect formatter settings in the completion list - apply standard renderer

#KT-1673 fixed

compiler/frontend/src/org/jetbrains/jet/resolve/DescriptorRenderer.java

@@ -249,6 +249,12 @@ public class DescriptorRenderer implements Renderer<DeclarationDescriptor> {
         return stringBuilder.toString();
     }
 
+    public String renderFunctionParameters(@NotNull FunctionDescriptor functionDescriptor) {
+        StringBuilder stringBuilder = new StringBuilder();
+        rootVisitor.renderValueParameters(functionDescriptor, stringBuilder);
+        return stringBuilder.toString();
+    }
+
     protected boolean shouldRenderDefinedIn() {
         return true;
     }

idea/src/org/jetbrains/jet/plugin/completion/DescriptorLookupConverter.java

@@ -20,9 +20,7 @@ import com.google.common.collect.Lists;
 import com.intellij.codeInsight.lookup.LookupElement;
 import com.intellij.codeInsight.lookup.LookupElementBuilder;
 import com.intellij.openapi.util.Iconable;
-import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.PsiElement;
-import com.intellij.util.Function;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.*;
@@ -64,14 +62,7 @@ public final class DescriptorLookupConverter {
             FunctionDescriptor functionDescriptor = (FunctionDescriptor) descriptor;
             JetType returnType = functionDescriptor.getReturnType();
             typeText = DescriptorRenderer.TEXT.renderType(returnType);
-
-            tailText = "(" + StringUtil.join(functionDescriptor.getValueParameters(), new Function<ValueParameterDescriptor, String>() {
-                @Override
-                public String fun(ValueParameterDescriptor valueParameterDescriptor) {
-                    return valueParameterDescriptor.getName() + ":" +
-                           DescriptorRenderer.TEXT.renderType(valueParameterDescriptor.getType());
-                }
-            }, ",") + ")";
+            tailText = DescriptorRenderer.TEXT.renderFunctionParameters(functionDescriptor);
 
             boolean extensionFunction = functionDescriptor.getReceiverParameter().exists();
             DeclarationDescriptor containingDeclaration = descriptor.getContainingDeclaration();

idea/testData/completion/basic/FunctionCompletionFormatting.kt

@@ -0,0 +1,7 @@
+fun test(a: Int) {}
+
+fun some() {
+    tes<caret>
+}
+
+// EXIST: test~(a : jet.Int)

idea/tests/org/jetbrains/jet/completion/JetBasicCompletionTest.java

@@ -81,6 +81,10 @@ public class JetBasicCompletionTest extends JetCompletionTestBase {
         doTest();
     }
 
+    public void testFunctionCompletionFormatting() {
+        doTest();
+    }
+
     public void testInCallExpression() {
         doTest();
     }