Re: Blank equation when exported to HTML using dvipng

[Richard Stanton <stanton@haas.berkeley.edu>]

> From: Puneeth Chaganti [mailto:punchagan@gmail.com]
> Sent: Sunday, May 27, 2012 10:48 PM
> To: Richard Stanton
> Subject: Re: [O] Blank equation when exported to HTML using dvipng
> 
> On Mon, May 28, 2012 at 11:13 AM, Richard Stanton
> <stanton@haas.berkeley.edu> wrote:
> > Here's a very simple ORG file:
> >
> > --------
> >
> > #+OPTIONS: LaTeX:dvipng
> >
> > * Test file
> > \begin{equation}
> > x=\sqrt{b}
> > \end{equation}
> >
> > ----------
> >
> > When I export this to HTML (Org-mode version 7.8.11 (release_7.8.11-12-
> gc55405 @ c:/emacs/site-lisp/org-mode/lisp/)), the equation comes out
> blank.
> >
> > The HTML file contains the following code:
> >
> > <img src="ltxpng/test_660c6efb146974e9d77e2de45f258385867ef389.png"
> > alt="\begin{equation} x=\sqrt{b} \end{equation}"/>
> >
> > However, directory ltxpng is empty.
> >
> > I'm running Emacs 24.0.97 under Windows Vista with MikTeX 2.09 installed
> and PATH set so that I can call pdflatex, dvipng, etc. from the command line
> just fine.
> >
> > Any thoughts about what might be going wrong?
> 
> Do you get any error messages?  Do you have dvipng installed?
> 
> --
> Puneeth

The *Messages* buffer shows the following:

Exporting...
Loading reftex...done
Creating LaTeX image 1
Failed to create dvi file from c:/Users/stanton/AppData/Local/Temp/orgtex5660EuC.tex
Exporting...
image ltxpng/test_660c6efb146974e9d77e2de45f258385867ef389.png t
Saving file c:/projects/texintro/web/test.html...
Wrote c:/projects/texintro/web/test.html
HTML export done, pushed to kill ring and clipboard

Investigating further, the log file associated with the tex file listed above shows the following:

Package ifplatform Warning: 
    shell escape is disabled, so I can only detect \ifwindows.

)
\minted@bgbox=\box31
\minted@code=\write4
\@float@every@listing=\toks22
\c@listing=\count106
)

! Package minted Error: You must invoke LaTeX with the -shell-escape flag.

See the minted package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.7 \usepackage
               [latin1]{inputenc}
? 
! Emergency stop.
 ...                                              
                                                  
l.7 \usepackage
               [latin1]{inputenc}
Pass the -shell-escape flag to LaTeX. Refer to the minted.sty documentation for
 more information.

So now I can see what the problem is, but how do I tell org-mode to call latex with the -shell-escape flag?