Latex In PmWiki
Dec 29, 2009
[Read the full article here . . .]
I just finished creating a module for PmWiki for rendering latex commands. It makes use of PDF-LaTeX and ImageMagick utilities installed on the server to enable interpretation and rendering of LaTeX commands in PmWiki and display them as images. Also, the module makes use of a cache, thus avoiding the expensive task of re-rendering every time a LaTeX snippet is requested. CMS like Drupal (and I guess MediaWiki as well) already have similar modules. So now we also have it for PmWiki as well!
I have released the module under GNU-GPL.
You can download the latest release from here:
http://www.pmwiki.org/wiki/Cookbook/TrueLatex
Some demonstrations:
1.
Einstein said (:latex:)$R_{\mu \nu} - {1 \over 2}g_{\mu \nu}\,R + g_{\mu \nu} \Lambda =
{8 \pi G \over c^4} T_{\mu \nu}$, where $R$ is the Ricci scalar(:latexend:). This is
known as the "Einstein field equation".
Produces:
Einstein said 
. This is known as the "Einstein field equation".
2.
(:latex:)
\begin{eqnarray}
10xy^2+15x^2y-5xy & = & 5\left(2xy^2+3x^2y-xy\right) \nonumber \\
& = & 5x\left(2y^2+3xy-y\right) \nonumber \\
& = & 5xy\left(2y+3x-1\right)
\end{eqnarray}
(:latexend:)
Produces:
3.
(:latex verbose=true:)
\[
i\hbar\frac{\partial}{\partial t} \Psi(\mathbf{r},\,t) =
-\frac{\hbar^2}{2m}\nabla^2 \Psi(\mathbf{r},\,t) + V(\mathbf{r})\Psi(\mathbf{r},\,t)
\]
(:latexend:)
Produces:
TrueLatex:
Using image file from cache. You may want to set ForceRender=true for debugging.
4.
(:latex displaycode+=true verbose=true forcerender=true paperwidth='5' ::eqncounter++:)
\begin{equation}
\prod_{n=2}^N\frac{n}{n-1} = N
\end{equation}
(:latexend:)
Produces: [:Example4 :]
\begin{equation}
\prod_{n=p}^N\frac{n}{n-1} = \frac{N}{p-1}
\end{equation}
TrueLatex:
Parsing LaTeX:
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=pdflatex)
restricted \write18 enabled.
kpathsea: Running mktexfmt pdflatex.fmt
mktexfmt: mktexfmt is using the following fmtutil.cnf files (in precedence order):
mktexfmt: /usr/share/texlive/texmf-dist/web2c/fmtutil.cnf
mktexfmt: mktexfmt is using the following fmtutil.cnf file for writing changes:
mktexfmt: ./.texlive2020/texmf-config/web2c/fmtutil.cnf
mktexfmt [INFO]: writing formats under /home4/starstu4/public_html/cgi-bin/subhrajit.net/wiki/pub/latexcache/.texlive2020/texmf-var/web2c
mktexfmt [INFO]: --- remaking pdflatex with pdftex
mktexfmt: running `pdftex -ini -jobname=pdflatex -progname=pdflatex -translate-file=cp227.tcx *pdflatex.ini' ...
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (INITEX)
restricted \write18 enabled.
(/usr/share/texlive/texmf-dist/web2c/cp227.tcx)
entering extended mode
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/pdflatex.ini
(/usr/share/texlive/texmf-dist/tex/generic/tex-ini-files/pdftexconfig.tex)
(/usr/share/texlive/texmf-dist/tex/latex/base/latex.ltx
(/usr/share/texlive/texmf-dist/tex/latex/base/texsys.cfg)
./texsys.aux found
\@currdir set to: ./.
Assuming \openin and \input
have the same search path.
Defining UNIX/DOS style filename parser.
catcodes, registers, parameters,
LaTeX2e <2020-10-01> patch level 4
! LaTeX requires expl3.
\errmessage {LaTeX requires expl3}
\batchmode \read -1 to \reserve...
l.1063 }
mktexfmt [INFO]: log file copied to: /home4/starstu4/public_html/cgi-bin/subhrajit.net/wiki/pub/latexcache/.texlive2020/texmf-var/web2c/pdftex/pdflatex.log
mktexfmt [ERROR]: running `pdftex -ini -jobname=pdflatex -progname=pdflatex -translate-file=cp227.tcx *pdflatex.ini >&2 Extracting image:
convert: unable to open image `temp-1.pdf': No such file or directory @ error/blob.c/OpenBlob/3071.
convert: no images defined `92b512a7b663c1c925de8080a75e1ee2.png' @ error/convert.c/ConvertImageCommand/3234.
ERROR in extracting image!
[:/Example4:]
5.
(:latex DisplayCode+=true:)\[ f^{ (n) }(a) = {n! \over 2\pi i} \oint_\gamma {f(z) \over
(z-a)^{n+1}}\, dz \](:latexend:)
Produces:
\[ f^{ (n) }(a) = {n! \over 2\pi i} \oint_\gamma {f(z) \over (z-a)^{n+1}}\, dz \]
6.
(:div style="background-color:#aaccff":)
(:latex fontsize=Huge:)
\[\left(\!\!
\begin{array}{c}
n \\
r
\end{array}
\!\!\right) = {^n}C_r = \frac{n!}{r!(n-r)!}
\]
(:latexend:) ... This formula is displayed on a non-white background.
(:divend:)
Produces:
... This formula is displayed on a non-white background.