From 20cae6482927462eb2c103b9fbdedaf000134a06 Mon Sep 17 00:00:00 2001
From: Stefan Salewski <mail@ssalewski.de>
Date: Sun, 17 Sep 2017 12:51:25 +0200
Subject: [PATCH] allow default nil parameters, i.e. for newSrolledWindow()

---
 tests/gen.nim | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tests/gen.nim b/tests/gen.nim
index 4b4e077..36d4026 100644
--- a/tests/gen.nim
+++ b/tests/gen.nim
@@ -1,5 +1,5 @@
 # High level gobject-introspection based GTK3 bindings for the Nim programming language
-# v 0.2 2017-SEP-17
+# v 0.2 2017-SEP-18
 # (c) S. Salewski 2017
 
 # https://wiki.gnome.org/Projects/GObjectIntrospection
@@ -390,7 +390,12 @@ proc genP(info: GICallableInfo; genProxy = false; binfo: GIBaseInfo = nil): (str
             str = str & " | " & provider.join(" | ")
     let name = mangleName(gBaseInfoGetName(arg))
     if isProxyCandidate(t) and not gArgInfoIsCallerAllocates(arg) and not userAlloc:
-      arglist.add("cast[" & genRec(t, false) & "](" & name & ".impl)")
+      ##############
+      if mayBeNil:
+        #arglist.add("if $1.isNil: nil else: cast[" & genRec(t, false) & "]($1.impl)" % name)
+        arglist.add("if " & name & ".isNil: nil else: cast[" & genRec(t, false) & "](" & name & ".impl)")
+      else:
+        arglist.add("cast[" & genRec(t, false) & "](" & name & ".impl)")
     else:
       if ct2nt.contains(str) and (gArgInfoGetDirection(arg) == GIDirection.OUT  or gArgInfoGetDirection(arg) == GIDirection.INOUT):
         let kk = if name[0] == '`': name[1 .. ^2] else: name
@@ -420,6 +425,10 @@ proc genP(info: GICallableInfo; genProxy = false; binfo: GIBaseInfo = nil): (str
     if genProxy and str == "string" and mayBeNil:
       str.add(" = nil")
 
+    if genProxy and isProxyCandidate(t) and mayBeNil:
+      str.add(" = nil")
+
+
     if (sym.startsWith("gdk_events_get_") or sym.startsWith("gdk_event_get_")) and str == "Event":
       str = "SomeEvent"