require embedded filenames

splubp.p8

@@ -137,13 +137,19 @@ function splubp:wnx(...)
  return self["write_"..self:op()](self, ...)
 end
 
-function splubp:emit_item(obj, filename)
+-- write an object of a known type.
+-- item must have a field named
+-- _file, containing a filename
+-- with a correct extension
+-- to save the file under.
+function splubp:emit_item(obj)
  if DEBUG then
   --[[global]] splubp_last_emit = obj
  end
- filename = filename or obj._file
+ -- todo: should _addr skip the
+ -- filename, instead?
  obj._addr = self.ptr
- self:write_s(filename)
+ self:write_s(obj._file)
  for row in all(self.fmts[split(filename, ".")[2]]) do
   local alt = self.wdirectives[row[1]]
   if alt then