How to have Latex in Empathy (using Mathjax).

install.sh

sudo apt-get install libjs-mathjax libjs-mathjax-doc fonts-mathjax fonts-mathjax-extras
cd /usr/share/adium/message-styles
sudo cp -R Classic.AdiumMessageStyle/ LatexClassic.AdiumMessageStyle/
cd LatexClassic.AdiumMessageStyle/Contents
sudo wget https://gist.githubusercontent.com/dario2994/8184649/raw/f8cd80dcfaabb71587d76bb27eac7220aa1f9171/PATCH_Info.plist -O Info.plist
sudo wget https://gist.githubusercontent.com/dario2994/8184649/raw/e3b5983889022f3fba0f97e4c2704b428d513253/PATCH_Content.html -O Resources/Content.html
gsettings set org.gnome.Empathy.conversation theme 'LatexClassic'

LatexInEmpathy

This guide explains how to modify the classic theme of empathy (minimal one... the best one!) in order to have latex in empathy's chat windows.
The two files PATCH_Info.plist, PATCH_Content.html are in this same gist.

First of all install mathjax:
	sudo apt-get install libjs-mathjax libjs-mathjax-doc fonts-mathjax fonts-mathjax-extras
	
Open /usr/share/adium/message-styles
	Make a copy of Classic.AdiumMessageStyle in the same folder and rename it LatexClassic.AdiumMessageStyle
	Open /LatexClassic.AdiumMessageStyle/Contents
		Modify Info.plist substituting its content with the content of PATCH_Info.plist
		Open /Resources
			Modify Content.html substituting its content with the content of PATCH_Content.html

Then go to:
	Empathy->Preferences->Theme 
		And Choose LatexClassic Theme

Close Empathy (set it offline and close the window). 
Now at the restart of Empathy you will have Latex implemented in the chat, usable with \( \) for inline math and $$ $$ for displayed math.

PATCH_Content.html

<div class="%messageClasses%">
	<span class="sender">%sender%:</span>
	<span class="message" id="ToBeMathjaxed">%message%</span>
	<script> 
		var newMsgSpan=document.getElementById("ToBeMathjaxed");
		newMsgSpan.removeAttribute("id");
		if( typeof MathJax == "undefined" ) {
			var MathScript = document.createElement("script");
			MathScript.src = "file:///usr/share/javascript/mathjax/MathJax.js?config=default";
			MathScript.type = "text/javascript";
			document.getElementsByTagName("head")[0].appendChild(MathScript); 
		}
		else MathJax.Hub.Queue(["Typeset", MathJax.Hub,newMsgSpan]);
	</script>
</div>
<div id="insert"></div>

PATCH_Info.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>AllowTextColors</key>
  <true/>

  <key>CFBundleDevelopmentRegion</key>
  <string>English</string>

  <key>CFBundleGetInfoString</key>
  <string>LatexClassic Message Style</string>

  <key>CFBundleIdentifier</key>
  <string>dario2994.LatexClassic.style</string>
  <key>CFBundleInfoDictionaryVersion</key>
  <string>1.0</string>

  <key>CFBundleName</key>
  <string>LatexClassic</string>

  <key>CFBundlePackageType</key>
  <string>AdIM</string>

  <key>DefaultBackgroundColor</key>
  <string>ffffff</string>

  <key>MessageViewVersion</key>
  <integer>4</integer>

  <key>DisableCombineConsecutive</key>
  <false/>

</dict>
</plist>