Index: trac/ticket/report.py
===================================================================
--- trac/ticket/report.py	(revision 4752)
+++ trac/ticket/report.py	(working copy)
@@ -32,6 +32,26 @@
 from trac.web.chrome import add_link, add_stylesheet, INavigationContributor
 from trac.wiki import wiki_to_html, IWikiSyntaxProvider, Formatter
 
+class ITicketReportRenderer(Interface):
+    """Extension point interface for components that implement new report 
+    writing formats."""
+
+    def get_report_format():
+        """Called to get the id for a report format, for example: .xls"""
+        
+	def get_report_mimetype():
+		"""Called to get the mimetype string for a report format"""
+	
+	def get_report_linkname():
+		"""Called to get the report link name that will appear on the UI"""
+	  	  
+	def get_report_linkclass():
+		"""Called to get the class of the link that will appear on the UI"""
+
+	def render(req, cols, rows):
+		"""Render the report, takes the request, columns and rows"""   
+
+
 class ReportModule(Component):
 
     implements(INavigationContributor, IPermissionRequestor, IRequestHandler,
@@ -111,6 +131,8 @@
         add_stylesheet(req, 'common/css/report.css')
         return 'report.cs', None
 
+    renderers = ExtensionPoint(ITicketReportRenderer)
+
     # Internal methods
 
     def _do_create(self, req, db):
@@ -364,7 +386,12 @@
         elif format == 'tab':
             self._render_csv(req, cols, rows, '\t')
             return None
-
+        else:
+        	for renderer in self.renderers:
+        		if renderer.get_report_format()==format:
+        			renderer.render(req,cols,rows)
+        			return None
+	
         return 'report.cs', None
 
     def add_alternate_links(self, req, args):
@@ -385,6 +412,19 @@
         if req.perm.has_permission('REPORT_SQL_VIEW'):
             add_link(req, 'alternate', '?format=sql', 'SQL Query',
                      'text/plain')
+                     
+        # add link for every loaded component 
+        # that implements ITicketReportRenderer             
+        
+        for renderer in self.renderers:
+			format = renderer.get_report_format()
+			mimetype = renderer.get_report_mimetype()
+			linkname = renderer.get_report_linkname()
+			linkclass = renderer.get_report_linkclass()
+        		
+			add_link(req,'alternate','?format='+format+href,
+            		 linkname,mimetype,linkclass)
+            				 
 
     def execute_report(self, req, db, id, sql, args):
         sql, args = self.sql_sub_vars(req, sql, args, db)