graphviz.tex

\documentclass{article}
\usepackage{hyperref}
\usepackage{graphicx}

\newcommand{\graphviz}[3]{
\IfFileExists{#1}{}{\immediate\write18{echo #2 | dot -o"#1.png" -Tpng}}
\begin{center}
\includegraphics[#3]{#1.png}
\end{center}
}


\begin{document}
\title{\LaTeX : test with GraphViz}
\author{Pierre Lindenbaum\\\href{https://twitter.com/yokofakun}{@yokofakun}\\ \url{http://plindenbaum.blogspot.com} }
\maketitle

\graphviz{tmpDot}{'digraph G { t9592[label="Gorilla"];t207598[label="Homininae"]; t9606[label="Homo sapiens"]; t9605[label="Homo"];t9604[label="Hominidae"]; t9606 -> t9605; t9605->t207598 ;  t9592 -> t207598; t207598->t9604}'}{scale=0.4}

\end{document}

pmid.tex

\documentclass{article}
\usepackage{hyperref}
\usepackage{graphicx}
\usepackage{framed}
\usepackage{color}
\usepackage[utf8]{inputenc}

\definecolor{shadecolor}{rgb}{0.9,0.9,0.9}

\newcommand{\pmid}[1]{
\IfFileExists{pmid_#1.tex}{}{\immediate\write18{curl -s  "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=#1&retmode=xml" | xsltproc --novalid -o pmid_#1.tex pubmed2tex.xsl -}}
\input{pmid_#1.tex}
}

\begin{document}
\title{\LaTeX : test Pubmed/XSLT}
\author{Pierre Lindenbaum\\\href{https://twitter.com/yokofakun}{@yokofakun}\\ \url{http://plindenbaum.blogspot.com} }
\maketitle


\pmid{22046109}
\pmid{21378989}
\pmid{21984761}
\pmid{15047801}
\end{document}

pubmed2tex.xsl

<?xml version='1.0'  encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' version='1.0' 
	> 
<xsl:output method="text" encoding="UTF-8"/>

<xsl:template match="/">
<xsl:apply-templates select="PubmedArticleSet/PubmedArticle/MedlineCitation/Article"/>
</xsl:template>



<xsl:template match="Article">
\section{<xsl:apply-templates select="ArticleTitle"/>}
<xsl:apply-templates select="AuthorList"/>\\
\emph{"<xsl:apply-templates select="Journal/Title"/>"}. {\bf vol. <xsl:apply-templates select="Journal/JournalIssue/Volume"/> }. <xsl:apply-templates select="Journal/JournalIssue/Issue"/>. (<xsl:apply-templates select="Journal/JournalIssue/PubDate/Year"/>). \\
<xsl:apply-templates select="Affiliation"/>\\
\url{http://www.ncbi.nlm.nih.gov/pubmed/<xsl:value-of select="../PMID"/>}\\

<xsl:if test="Abstract/AbstractText">
\begin{shaded}
<xsl:apply-templates select="Abstract/AbstractText"/>
\end{shaded}
</xsl:if>

</xsl:template>

<xsl:template match="AuthorList">
<xsl:text>{\bf </xsl:text>
<xsl:for-each select="Author">
<xsl:choose>
 <xsl:when test="position()=1"></xsl:when>
 <xsl:when test="position()=last()"> and </xsl:when>
 <xsl:otherwise>, </xsl:otherwise>
</xsl:choose>
<xsl:apply-templates select="LastName/text()"/>
<xsl:text> </xsl:text>
<xsl:apply-templates select="Initials/text()"/>
</xsl:for-each>
<xsl:text>}</xsl:text>
</xsl:template>

<!-- copied from https://github.com/Siyavula/siyavula.html2latex/blob/master/templates/xslt/xh2latex.xsl -->

<xsl:template match="text()">

  <xsl:call-template name="esc">
    <xsl:with-param name="c" select='"#"'/>
    <xsl:with-param name="s">
      <xsl:call-template name="esc">
	<xsl:with-param name="c" select='"$"'/>
	<xsl:with-param name="s">
	  <xsl:call-template name="esc">
	    <xsl:with-param name="c" select='"%"'/>
	    <xsl:with-param name="s">
	      <xsl:call-template name="esc">
		<xsl:with-param name="c" select='"&amp;"'/>
		<xsl:with-param name="s">
		  <xsl:call-template name="esc">
		    <xsl:with-param name="c" select='"~"'/>
		    <xsl:with-param name="s">
		      <xsl:call-template name="esc">
			<xsl:with-param name="c" select='"_"'/>
			<xsl:with-param name="s">
			  <xsl:call-template name="esc">
			    <xsl:with-param name="c" select='"^"'/>
			    <xsl:with-param name="s">
			      <xsl:call-template name="esc">
				<xsl:with-param name="c" select='"{"'/>
				<xsl:with-param name="s">
				  <xsl:call-template name="esc">
				    <xsl:with-param name="c" select='"}"'/>
				    <xsl:with-param name="s">
				      <xsl:call-template name="esc">
					<xsl:with-param name="c" select='"\"'/>
					<xsl:with-param name="s" select='.'/>
				      </xsl:call-template>
				    </xsl:with-param>
				  </xsl:call-template>
				</xsl:with-param>
			      </xsl:call-template>
			    </xsl:with-param>
			  </xsl:call-template>
			</xsl:with-param>
		      </xsl:call-template>
		    </xsl:with-param>
		  </xsl:call-template>
		</xsl:with-param>
	      </xsl:call-template>
	    </xsl:with-param>
	  </xsl:call-template>
	</xsl:with-param>
      </xsl:call-template>
    </xsl:with-param>
  </xsl:call-template>
</xsl:template>

<xsl:template name="esc">
  <xsl:param name="s"/>
  <xsl:param name="c"/>

  <xsl:choose>
    <xsl:when test='contains($s, $c)'>
      <xsl:value-of select='substring-before($s, $c)'/>
      <xsl:text>\</xsl:text>

      <xsl:choose>
	<xsl:when test='$c = "\"'>
	  <xsl:text>textbackslash </xsl:text>
	</xsl:when>
	<xsl:otherwise>
	  <xsl:value-of select='$c'/>
	</xsl:otherwise>
      </xsl:choose>

      <xsl:call-template name="esc">
	<xsl:with-param name='c' select='$c'/>
	<xsl:with-param name='s' select='substring-after($s, $c)'/>
      </xsl:call-template>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select='$s'/>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>


</xsl:stylesheet>

remoteimage.tex

\documentclass{article}
\usepackage{hyperref}
\usepackage{graphicx}

\newcommand{\remoteimage}[3]{
\IfFileExists{#1}{}{\immediate\write18{curl -o "#1" "#2"}}
\begin{center}
\includegraphics[#3]{#1}
\end{center}
}


\begin{document}
\title{\LaTeX : test with an external Image}
\author{Pierre Lindenbaum\\\href{https://twitter.com/yokofakun}{@yokofakun}\\ \url{http://plindenbaum.blogspot.com} }
\maketitle

\begin{center}
\remoteimage{tmp1.jpg}{http://upload.wikimedia.org/wikipedia/commons/2/2e/Charles_Darwin_seated_crop.jpg}{scale=0.1}
Charles Darwin. Image via wikipedia.
\end{center}

\end{document}