\ifshellescape

\ifshellescape

[Mojca Miklavec]

Hello,

is there any command to test for write18/shell escape available in ConTeXt?


In one of the LaTeX packages I saw:

\newif\ifShellEscape
...
\ifShellEscape
   \def\tmpfile{/tmp/w18-test-\the\year\the\month\the\day\the\time}
   \ifmiktex
      \immediate\write18{rem >"\tmpfile"}
   \else
      \immediate\write18{touch \tmpfile}
   \fi
   \ifmiktex
      \IfFileExists{\tmpfile.}{\ShellEscapetrue}{\ShellEscapefalse}
   \else
      \IfFileExists{\tmpfile}{\ShellEscapetrue}{\ShellEscapefalse}
   \fi
\fi

Thanks a lot,
    Mojca

Re: \ifshellescape

[Aditya Mahajan]

On Tue, 26 Dec 2006, Mojca Miklavec wrote:

> Hello,
> 
> is there any command to test for write18/shell escape available in ConTeXt?

\ifeof18 checks if write18 is disabled. I think that it is etex only.


The next method is error prone, for a lot of reasons, the directory 
/tmp may not exist (atleast in Windows). A bit safer option may be 
$TEMP. I do not know of \ifmiktex switch, but I am sure TeXLive on 
windows will not set it to true.

> In one of the LaTeX packages I saw:
> 
> \newif\ifShellEscape
> ...
> \ifShellEscape
>    \def\tmpfile{/tmp/w18-test-\the\year\the\month\the\day\the\time}
>    \ifmiktex
>       \immediate\write18{rem >"\tmpfile"}
>    \else
>       \immediate\write18{touch \tmpfile}
>    \fi
>    \ifmiktex
>       \IfFileExists{\tmpfile.}{\ShellEscapetrue}{\ShellEscapefalse}
>    \else
>       \IfFileExists{\tmpfile}{\ShellEscapetrue}{\ShellEscapefalse}
>    \fi
> \fi
>

HTH,
Aditya

Re: \ifshellescape

[Peter Münster]

On Tue, 26 Dec 2006, Mojca Miklavec wrote:

> is there any command to test for write18/shell escape available in ConTeXt?

There is such a command in pdfTeX-1.40 but I don't remember the name
(I think it's "\ifshellescape").
Cheers, Peter

-- 
http://pmrb.free.fr/contact/

Re: \ifshellescape

[Henning Hraban Ramm]

Am 2006-12-26 um 19:57 schrieb Peter Münster:

>> is there any command to test for write18/shell escape available in  
>> ConTeXt?
>
> There is such a command in pdfTeX-1.40 but I don't remember the name
> (I think it's "\ifshellescape").

\ifeof18

 From the t-lilypond sources:
%D If \type{\ifeof18} creates an error for you, your pdfetex is too old.
%D (\type{\ifeof18} checks whether \type{\write18} is disabled.)




Greetlings from Lake Constance!
Hraban
---
http://www.fiee.net/texnique/
http://contextgarden.net
http://www.cacert.org (I'm an assurer)

Re: \ifshellescape

[Martin Schröder]

2006/12/26, Peter Münster <pmlists@free.fr>:
> There is such a command in pdfTeX-1.40 but I don't remember the name
> (I think it's "\ifshellescape").

It's new in 1.30:
  - \pdfshellescape is a read-only integer that is 1 if \write18 is enabled, 0
    otherwise.

Best
   Martin

Re: \ifshellescape

[Hans Hagen]

� wrote:
> On Tue, 26 Dec 2006, Mojca Miklavec wrote:
>
>   
>> is there any command to test for write18/shell escape available in ConTeXt?
>>     
>
> There is such a command in pdfTeX-1.40 but I don't remember the name
> (I think it's "\ifshellescape").
> Cheers, Peter
>
>   
 >grep shellescape *.tex
core-job.tex:\ifx\pdfshellescape\undefined \else
core-job.tex:    \chardef\systemcommandmode \ifcase\pdfshellescape 
\plusone \else \plustwo \fi

so \systemcommandmode is your friend

-- 

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Re: \ifshellescape

[Mojca Miklavec]

On 12/26/06, Hans Hagen wrote:
> Peter Münster wrote:
> > On Tue, 26 Dec 2006, Mojca Miklavec wrote:
> >
> >
> >> is there any command to test for write18/shell escape available in ConTeXt?
> >>
> > There is such a command in pdfTeX-1.40 but I don't remember the name
> > (I think it's "\ifshellescape").
> > Cheers, Peter
> >
> >
>  >grep shellescape *.tex
> core-job.tex:\ifx\pdfshellescape\undefined \else
> core-job.tex:    \chardef\systemcommandmode \ifcase\pdfshellescape
> \plusone \else \plustwo \fi
>
> so \systemcommandmode is your friend

Wait! So many alternatives that I'll have to create another function
to choose one of them randomly ;)

Thanks a lot, (I'll use \systemcommandmode then),
   Mojca

Re: \ifshellescape

[Martin Schröder]

2006/12/26, Mojca Miklavec <mojca.miklavec.lists@gmail.com>:
> Wait! So many alternatives that I'll have to create another function
> to choose one of them randomly ;)

pdftex 1.30 has functions for random numbers. :-)

Best
   Martin

Re: \ifshellescape

[Mojca Miklavec]

On 12/26/06, Hans Hagen wrote:
>
> core-job.tex:\ifx\pdfshellescape\undefined \else
> core-job.tex:    \chardef\systemcommandmode \ifcase\pdfshellescape
> \plusone \else \plustwo \fi
>
> so \systemcommandmode is your friend

What exactly is the advantage of using \pdfshellescape over \ifeof18
as the basis of \systemcommandmode? The second one works in XeTeX as
well while the first is only good for pdfTeX, but perhaps there are
other reasons for using it.

Thanks,
    Mojca

Re: \ifshellescape

[Hans Hagen]

Mojca Miklavec wrote:
> On 12/26/06, Hans Hagen wrote:
>   
>> core-job.tex:\ifx\pdfshellescape\undefined \else
>> core-job.tex:    \chardef\systemcommandmode \ifcase\pdfshellescape
>> \plusone \else \plustwo \fi
>>
>> so \systemcommandmode is your friend
>>     
>
> What exactly is the advantage of using \pdfshellescape over \ifeof18
> as the basis of \systemcommandmode? The second one works in XeTeX as
> well while the first is only good for pdfTeX, but perhaps there are
> other reasons for using it.
>
>   
write 18 is a hack and pdfshellescape a sane replacement

in luatex it will probably be gone completely since there we have

\directlua 0 { os.execute("...") }

Hans