To add Gravatars to propane just run: curl https://gist.github.com/albus522/6496657/raw/update.sh | bash

propane.patch

--- enhancer.js.orig	2012-07-25 02:38:06.000000000 -0400
+++ enhancer.js	2012-08-02 10:04:02.000000000 -0400
@@ -1,5 +1,7 @@
 if (window.propane) {
 
+  (function(a){function b(a,b){var c=(a&65535)+(b&65535),d=(a>>16)+(b>>16)+(c>>16);return d<<16|c&65535}function c(a,b){return a<<b|a>>>32-b}function d(a,d,e,f,g,h){return b(c(b(b(d,a),b(f,h)),g),e)}function e(a,b,c,e,f,g,h){return d(b&c|~b&e,a,b,f,g,h)}function f(a,b,c,e,f,g,h){return d(b&e|c&~e,a,b,f,g,h)}function g(a,b,c,e,f,g,h){return d(b^c^e,a,b,f,g,h)}function h(a,b,c,e,f,g,h){return d(c^(b|~e),a,b,f,g,h)}function i(a,c){a[c>>5]|=128<<c%32,a[(c+64>>>9<<4)+14]=c;var d,i,j,k,l,m=1732584193,n=-271733879,o=-1732584194,p=271733878;for(d=0;d<a.length;d+=16)i=m,j=n,k=o,l=p,m=e(m,n,o,p,a[d],7,-680876936),p=e(p,m,n,o,a[d+1],12,-389564586),o=e(o,p,m,n,a[d+2],17,606105819),n=e(n,o,p,m,a[d+3],22,-1044525330),m=e(m,n,o,p,a[d+4],7,-176418897),p=e(p,m,n,o,a[d+5],12,1200080426),o=e(o,p,m,n,a[d+6],17,-1473231341),n=e(n,o,p,m,a[d+7],22,-45705983),m=e(m,n,o,p,a[d+8],7,1770035416),p=e(p,m,n,o,a[d+9],12,-1958414417),o=e(o,p,m,n,a[d+10],17,-42063),n=e(n,o,p,m,a[d+11],22,-1990404162),m=e(m,n,o,p,a[d+12],7,1804603682),p=e(p,m,n,o,a[d+13],12,-40341101),o=e(o,p,m,n,a[d+14],17,-1502002290),n=e(n,o,p,m,a[d+15],22,1236535329),m=f(m,n,o,p,a[d+1],5,-165796510),p=f(p,m,n,o,a[d+6],9,-1069501632),o=f(o,p,m,n,a[d+11],14,643717713),n=f(n,o,p,m,a[d],20,-373897302),m=f(m,n,o,p,a[d+5],5,-701558691),p=f(p,m,n,o,a[d+10],9,38016083),o=f(o,p,m,n,a[d+15],14,-660478335),n=f(n,o,p,m,a[d+4],20,-405537848),m=f(m,n,o,p,a[d+9],5,568446438),p=f(p,m,n,o,a[d+14],9,-1019803690),o=f(o,p,m,n,a[d+3],14,-187363961),n=f(n,o,p,m,a[d+8],20,1163531501),m=f(m,n,o,p,a[d+13],5,-1444681467),p=f(p,m,n,o,a[d+2],9,-51403784),o=f(o,p,m,n,a[d+7],14,1735328473),n=f(n,o,p,m,a[d+12],20,-1926607734),m=g(m,n,o,p,a[d+5],4,-378558),p=g(p,m,n,o,a[d+8],11,-2022574463),o=g(o,p,m,n,a[d+11],16,1839030562),n=g(n,o,p,m,a[d+14],23,-35309556),m=g(m,n,o,p,a[d+1],4,-1530992060),p=g(p,m,n,o,a[d+4],11,1272893353),o=g(o,p,m,n,a[d+7],16,-155497632),n=g(n,o,p,m,a[d+10],23,-1094730640),m=g(m,n,o,p,a[d+13],4,681279174),p=g(p,m,n,o,a[d],11,-358537222),o=g(o,p,m,n,a[d+3],16,-722521979),n=g(n,o,p,m,a[d+6],23,76029189),m=g(m,n,o,p,a[d+9],4,-640364487),p=g(p,m,n,o,a[d+12],11,-421815835),o=g(o,p,m,n,a[d+15],16,530742520),n=g(n,o,p,m,a[d+2],23,-995338651),m=h(m,n,o,p,a[d],6,-198630844),p=h(p,m,n,o,a[d+7],10,1126891415),o=h(o,p,m,n,a[d+14],15,-1416354905),n=h(n,o,p,m,a[d+5],21,-57434055),m=h(m,n,o,p,a[d+12],6,1700485571),p=h(p,m,n,o,a[d+3],10,-1894986606),o=h(o,p,m,n,a[d+10],15,-1051523),n=h(n,o,p,m,a[d+1],21,-2054922799),m=h(m,n,o,p,a[d+8],6,1873313359),p=h(p,m,n,o,a[d+15],10,-30611744),o=h(o,p,m,n,a[d+6],15,-1560198380),n=h(n,o,p,m,a[d+13],21,1309151649),m=h(m,n,o,p,a[d+4],6,-145523070),p=h(p,m,n,o,a[d+11],10,-1120210379),o=h(o,p,m,n,a[d+2],15,718787259),n=h(n,o,p,m,a[d+9],21,-343485551),m=b(m,i),n=b(n,j),o=b(o,k),p=b(p,l);return[m,n,o,p]}function j(a){var b,c="";for(b=0;b<a.length*32;b+=8)c+=String.fromCharCode(a[b>>5]>>>b%32&255);return c}function k(a){var b,c=[];c[(a.length>>2)-1]=undefined;for(b=0;b<c.length;b+=1)c[b]=0;for(b=0;b<a.length*8;b+=8)c[b>>5]|=(a.charCodeAt(b/8)&255)<<b%32;return c}function l(a){return j(i(k(a),a.length*8))}function m(a,b){var c,d=k(a),e=[],f=[],g;e[15]=f[15]=undefined,d.length>16&&(d=i(d,a.length*8));for(c=0;c<16;c+=1)e[c]=d[c]^909522486,f[c]=d[c]^1549556828;return g=i(e.concat(k(b)),512+b.length*8),j(i(f.concat(g),640))}function n(a){var b="0123456789abcdef",c="",d,e;for(e=0;e<a.length;e+=1)d=a.charCodeAt(e),c+=b.charAt(d>>>4&15)+b.charAt(d&15);return c}function o(a){return unescape(encodeURIComponent(a))}function p(a){return l(o(a))}function q(a){return n(p(a))}function r(a,b){return m(o(a),o(b))}function s(a,b){return n(r(a,b))}function t(a,b,c){return b?c?r(b,a):s(b,a):c?p(a):q(a)}"use strict",typeof define=="function"&&define.amd?define(function(){return t}):a.md5=t})(this);
+
   /* This is the same as Campfire's inbuild augment() function that is defined for mobile safari*/
   function swizzle(klass, methods) {
     var wrappedMethods = {}, methodName;
@@ -26,6 +28,26 @@
       }
       return null;
     },
+    authorDataEmail: function () {
+      var dataNameProvider = this.authorCell.querySelector('span.author');
+      if (dataNameProvider != null) {
+        return dataNameProvider.getAttribute('data-email').toLowerCase();
+      }
+      return null;
+    },
+    authorAvatar: function () {
+      var dataNameProvider = this.authorCell.querySelector('span.author');
+      if (dataNameProvider != null) {
+        var avatar = dataNameProvider.getAttribute('data-avatar');
+        if (avatar != null)
+          return avatar;
+
+        var email = dataNameProvider.getAttribute('data-email');
+        if (email != null)
+          return 'http://www.gravatar.com/avatar/'+md5(email.toLowerCase())+'?d=retro';
+      }
+      return 'http://www.gravatar.com/avatar/'+md5('missing')+'?d=retro';
+    }
   });
 
   Object.extend(Campfire.LayoutManager.prototype, {
@@ -78,14 +100,34 @@
 
   Campfire.PropaneResponder = Class.create({
     initialize: function(chat) {
+      var self = this;
       this.chat = chat;
       this.shouldForceScrollToBottom = true;
 
+      chat.transcript.element.childElements().each(function(elem){
+        var msg = new Campfire.Message(chat, elem)
+        self.addGravatar(msg)
+      });
+
+      this.chat.layoutmanager.layout();
+      this.chat.windowmanager.scrollToBottom();
+
       var messages = this.chat.transcript.messages;
       for (var i = 0; i < messages.length; i++) {
         this.fixSoundMessage(messages[i]);
       }
     },
+    addGravatar: function(message) {
+      if (message.actsLikeTextMessage()) {
+        var author = message.authorElement();
+
+        if (author.visible()) {
+          author.insert({after: '<img alt="'+message.author()+'" width="30" height="30" align="top" style="margin-left: 5px; border-radius:3px" src="'+message.authorAvatar()+'">'});
+          author.hide();
+          message.bodyCell.insert({top: '<strong>' + message.author() + '</strong>'});
+        }
+      }
+    },
     authorID: function(message) {
       if (Element.hasClassName(message.element, 'you'))
         return this.chat.userID;
@@ -169,6 +211,11 @@
         }
         
         window.propane.messageInserted(message.id(), this.authorID(message), authorText, message.kind,  body);
+
+        this.addGravatar(message);
       }
     },
     noteBottomScrollPosition: function() {

update.sh

cd /Applications/Propane.app/Contents/Resources/
cp enhancer.js enhancer.js.orig
curl https://gist.github.com/albus522/6496657/raw/propane.patch | patch enhancer.js