From a595b7fd82f3d7c054f4a28f6b2d5770e6aade15 Mon Sep 17 00:00:00 2001
From: dshaligram <dshaligram@c06c8d41-db1a-0410-9941-cceddc491573>
Date: Thu, 4 Jan 2007 12:56:06 +0000
Subject: [1626830] Fixed non-stacking potions.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@782 c06c8d41-db1a-0410-9941-cceddc491573
---
 crawl-ref/source/itemname.cc | 21 +++++++++++++++++----
 crawl-ref/source/items.cc    | 19 ++++++++++++++-----
 2 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/crawl-ref/source/itemname.cc b/crawl-ref/source/itemname.cc
index 56f477c5ca..6b54bce4ed 100644
--- a/crawl-ref/source/itemname.cc
+++ b/crawl-ref/source/itemname.cc
@@ -66,7 +66,6 @@ static bool is_tried_type( int basetype, int subtype )
     }
 }
 
-
 bool is_vowel( const char chr )
 {
     const char low = tolower( chr );
@@ -74,11 +73,25 @@ bool is_vowel( const char chr )
     return (low == 'a' || low == 'e' || low == 'i' || low == 'o' || low == 'u');
 }
 
+item_type_id_type objtype_to_idtype(int base_type)
+{
+    switch (base_type)
+    {
+    case OBJ_WANDS:     return (IDTYPE_WANDS);
+    case OBJ_SCROLLS:   return (IDTYPE_SCROLLS);
+    case OBJ_JEWELLERY: return (IDTYPE_JEWELLERY);
+    case OBJ_POTIONS:   return (IDTYPE_POTIONS);
+    default:            return (NUM_IDTYPE);
+    }
+}
+
 bool item_type_known( const item_def &item )
 {
-    return item_ident(item, ISFLAG_KNOW_TYPE)
-        || (item.base_type == OBJ_JEWELLERY
-                && id[IDTYPE_JEWELLERY][item.sub_type] == ID_KNOWN_TYPE);
+    if (item_ident(item, ISFLAG_KNOW_TYPE))
+        return (true);
+
+    const item_type_id_type idt = objtype_to_idtype(item.base_type);
+    return (idt != NUM_IDTYPE? id[idt][item.sub_type] == ID_KNOWN_TYPE : false);
 }
 
 // it_name() and in_name() are now somewhat obsolete now that itemname
diff --git a/crawl-ref/source/items.cc b/crawl-ref/source/items.cc
index dcab9825a2..ff8ed47ef2 100644
--- a/crawl-ref/source/items.cc
+++ b/crawl-ref/source/items.cc
@@ -1308,6 +1308,16 @@ bool is_stackable_item( const item_def &item )
     return (false);
 }
 
+int ident_flags(const item_def &item)
+{
+    int flags = item.flags & full_ident_mask(item);
+
+    if (!(flags & ISFLAG_KNOW_TYPE) && item_type_known(item))
+        flags |= ISFLAG_KNOW_TYPE;
+
+    return (flags);
+}
+
 bool items_stack( const item_def &item1, const item_def &item2 )
 {
     // both items must be stackable
@@ -1334,8 +1344,7 @@ bool items_stack( const item_def &item1, const item_def &item2 )
     }
 
     // Check the ID flags
-    if ( (item1.flags & full_ident_mask(item1)) !=
-         (item2.flags & full_ident_mask(item2)) )
+    if (ident_flags(item1) != ident_flags(item2))
         return false;
 
     // Check the non-ID flags
@@ -1343,14 +1352,14 @@ bool items_stack( const item_def &item1, const item_def &item2 )
         (item2.flags & (~ISFLAG_IDENT_MASK)))
         return false;
 
-
     // Thanks to mummy cursing, we can have potions of decay 
     // that don't look alike... so we don't stack potions 
     // if either isn't identified and they look different.  -- bwr
     if (item1.base_type == OBJ_POTIONS && item1.special != item2.special &&
-        (!item_ident(item1, ISFLAG_KNOW_TYPE) ||
-         !item_ident(item2, ISFLAG_KNOW_TYPE )))
+        (!item_type_known(item1) || !item_type_known(item2)))
+    {
         return false;
+    }
 
     return (true);
 }
-- 
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