Re: [NTG-context] nil error in guess

15 Oct 2012

      On 13-10-2012 11:29, Meer, H. van der wrote:
...
! LuaTeX error ...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:221: bad argument #1 to 'match' (string expected, got nil)
stack traceback:
  [C]: in function 'match'
  ...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:221: in function 'guess'
  ...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:1145: in function <...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:1143>
  (tail call): ?
  ...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:767: in function 'locate'
  ...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:844: in function 'identifier'
  ...t-04/tex/texmf-context/tex/context/base/grph-inc.lua:862: in function 'identify'
  <main ctx instance>:1: in main chunk.
The version used is:
ConTeXt  ver: 2012.10.06 15:31 MKIV  fmt: 2012.10.13  int: english/english
Is there a quick fix, or I get stuck at a bad moment.
Thanks in advance.
function figures.guess(filename)
     local f = io.open(filename,'rb')
     if f then
         local str = f:read(100)
         f:close()
         if str then
             for i=1,#magics do
                 local pattern = magics[i]
                 if pattern.pattern:match(str) then
                     local format = pattern.format
                     if trace_figures then
                         report_inclusion("file %q has format 
%s",filename,format)
                     end
                     return format
                 end
             end
         end
     end
end

One might wonder why str is nil.

Hans

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