support "Spaces before method declaration parentheses" option for Python (PY-4241)

python/src/com/jetbrains/python/formatter/PyBlock.java

@@ -381,6 +381,9 @@ public class PyBlock implements ASTBlock {
     if (type2 == PyElementTypes.ARGUMENT_LIST) {
       return getSpacingForOption(mySettings.SPACE_BEFORE_METHOD_CALL_PARENTHESES);
     }
+    if (type2 == PyElementTypes.PARAMETER_LIST) {
+      return getSpacingForOption(mySettings.SPACE_BEFORE_METHOD_PARENTHESES);
+    }
 
     if (type1 == PyTokenTypes.EQ || type2 == PyTokenTypes.EQ) {
       if (parentType == PyElementTypes.ASSIGNMENT_STATEMENT) {

python/src/com/jetbrains/python/formatter/PyLanguageCodeStyleSettingsProvider.java

@@ -33,6 +33,7 @@ public class PyLanguageCodeStyleSettingsProvider extends LanguageCodeStyleSettin
   public void customizeSettings(@NotNull CodeStyleSettingsCustomizable consumer, @NotNull SettingsType settingsType) {
     if (settingsType == SettingsType.SPACING_SETTINGS) {
       consumer.showStandardOptions("SPACE_BEFORE_METHOD_CALL_PARENTHESES",
+                                   "SPACE_BEFORE_METHOD_PARENTHESES",
                                    "SPACE_AROUND_ASSIGNMENT_OPERATORS",
                                    "SPACE_AROUND_EQUALITY_OPERATORS",
                                    "SPACE_AROUND_RELATIONAL_OPERATORS",

python/testData/formatter/spaceInMethodDeclaration.py

@@ -0,0 +1,4 @@
+def foo(bar, baz):
+    pass
+
+foo(True, False)

python/testData/formatter/spaceInMethodDeclaration_after.py

@@ -0,0 +1,4 @@
+def foo (bar, baz):
+    pass
+
+foo(True, False)

python/testSrc/com/jetbrains/python/PyFormatterTest.java

@@ -117,6 +117,11 @@ public class PyFormatterTest extends PyLightFixtureTestCase {
     doTest();
   }
 
+  public void testSpaceInMethodDeclaration() {  // PY-4241
+    CodeStyleSettingsManager.getInstance().getSettings(myFixture.getProject()).SPACE_BEFORE_METHOD_PARENTHESES = true;
+    doTest();
+  }
+
   public void testPsiFormatting() { // IDEA-69724
     String initial =
       "def method_name(\n" +