From a9178223ec8b11a5de7937e3bd5f4492eb6ceea6 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg42.2a@gmail.com>
Date: Fri, 17 May 2013 17:37:18 +0200
Subject: have ``new_user_whatsit()`` accept prototype as first argument

---
 luatexbase-attr.dtx | 39 ++++++++++++++++-----------------------
 1 file changed, 16 insertions(+), 23 deletions(-)

diff --git a/luatexbase-attr.dtx b/luatexbase-attr.dtx
index 3e01827..f10e2de 100644
--- a/luatexbase-attr.dtx
+++ b/luatexbase-attr.dtx
@@ -262,7 +262,7 @@ See the aforementioned source file(s) for copyright and licensing information.
 %
 %    \subsubsection{Primitives needed}
 %
-%    First load \pk{luatexbase-modutils} (hence \pk{luatexbase-loader} 
+%    First load \pk{luatexbase-modutils} (hence \pk{luatexbase-loader}
 %    and \pk{luatexbase-compat}), and make sure \pk{luatex.sty} is loaded too.
 %
 %    \begin{macrocode}
@@ -523,28 +523,22 @@ luatexbase.new_user_whatsit_id = new_user_whatsit_id
 %    We return a nullary function that delivers copies of the whatsit.
 %
 %    \begin{macrocode}
---- string -> string -> (unit -> node_t, int)
-local new_user_whatsit = function (name, package)
-    local id         = new_user_whatsit_id(name, package)
-    local whatsit    = newnode(whatsit_t, user_defined_t)
-    whatsit.user_id  = id
-    --- unit -> node_t
-    local generator = function (proto)
-        local res
-        if proto then
-            local proto_id = proto.user_id
-            if proto_id ~= id then --- mismatch
-                warning("overriding user_id %d of whatsit prototype (now: %d)",
-                        proto.user_id, id)
-            end
-            res = copynode(proto)
-            res.user_id = id
-        else
-            res = copynode(whatsit)
+--- (string | node_t) -> string -> ((unit -> node_t) * int)
+local new_user_whatsit = function (req, package)
+    local id, whatsit
+    if type(req) == "string" then
+        id              = new_user_whatsit_id(req, package)
+        whatsit         = newnode(whatsit_t, user_defined_t)
+        whatsit.user_id = id
+    else -- node
+        id      = req.user_id
+        whatsit = copynode(req)
+        if not whatsit_ids[id] then
+            warning("whatsit id %d unregistered; "
+                    .. "inconsistencies may arise", id)
         end
-        return res
     end
-    return generator, id
+    return function () return copynode(whatsit) end, id
 end
 luatexbase.new_user_whatsit         = new_user_whatsit
 %    \end{macrocode}
@@ -632,7 +626,7 @@ local dump_registered_whatsits = function (asked_package)
     --- mess up line breaking, so concatenation is unusable ...
     local first = true
     for i=1, #whatsit_list do
-        if first then 
+        if first then
             first = false
         else -- indent
             texiowrite_nl"  "
@@ -647,7 +641,6 @@ luatexbase.dump_registered_whatsits = dump_registered_whatsits
 %    \begin{macrocode}
 luatexbase.newattribute            = new_attribute
 luatexbase.newuserwhatsit          = new_user_whatsit
-luatexbase.newuserwhatsitfactory   = new_user_whatsit_factory
 luatexbase.newuserwhatsitid        = new_user_whatsit_id
 luatexbase.getuserwhatsitid        = get_user_whatsit_id
 luatexbase.getuserwhatsitname      = get_user_whatsit_name
-- 
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