beta 2013.01.13 23:10

1 files changed, 8 insertions, 3 deletions

diff --git a/tex/context/base/util-seq.lua b/tex/context/base/util-seq.lua
index 711424a2c..0bf056365 100644
--- a/tex/context/base/util-seq.lua
+++ b/tex/context/base/util-seq.lua
@@ -235,6 +235,7 @@ local function construct(t)
             t.compiled = format("%s\nreturn function(%s)\n%s\nend",variables,arguments,calls)
         end
     end
+-- print(t.compiled)
     return t.compiled -- also stored so that we can trace
 end
 
@@ -273,7 +274,7 @@ sequencers.compile = compile
 
 -- todo: use sequencer (can have arguments and returnvalues etc now)
 
-local template = [[
+local template_yes = [[
 %s
 return function(head%s)
   local ok, done = false, false
@@ -281,6 +282,11 @@ return function(head%s)
   return head, done
 end]]
 
+local template_nop = [[
+return function()
+  return false, false
+end]]
+
 function sequencers.nodeprocessor(t,nofarguments) -- todo: handle 'kind' in plug into tostring
     local list, order, kind, gskip, askip = t.list, t.order, t.kind, t.gskip, t.askip
     local vars, calls, args, n = { }, { }, nil, 0
@@ -319,7 +325,6 @@ function sequencers.nodeprocessor(t,nofarguments) -- todo: handle 'kind' in plug
             end
         end
     end
-    local processor = format(template,concat(vars,"\n"),args,concat(calls,"\n"))
- -- print(processor)
+    local processor = #calls > 0 and format(template_yes,concat(vars,"\n"),args,concat(calls,"\n")) or template_nop
     return processor
 end