nil error in guess

nil error in guess

[Meer, H. van der]

! 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.

Hans van der Meer



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Re: nil error in guess

[Hans Hagen]

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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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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