show download button on report view if appropriate

expert/browser/report.pt

@@ -17,6 +17,10 @@
         <div metal:define-macro="buttons">
           <input type="submit" name="report_execute" value="Execute Report"
                  i18n:attributes="value" />
+          <input type="submit"
+                 tal:condition="item/reportDownload"
+                 tal:attributes="name string:${item/reportDownload}:method;
+                                 value item/reportDownloadTitle" />
         </div>
       </form>
     <div metal:use-macro="item/resultsRenderer" />

expert/browser/report.py

@@ -138,6 +138,7 @@ class ResultsConceptView(ConceptView):
     """
 
     reportName = None   # define in subclass if applicable
+    reportDownload = None
     reportType = None   # set for using special report instance adapter
 
     def __init__(self, context, request):
@@ -157,6 +158,9 @@ class ResultsConceptView(ConceptView):
     def macro(self):
         return self.result_macros['content']
 
+    def reportDownloadTitle(self):
+        return _(u'Download $title', mapping={'title': self.report.title})
+
     @Lazy
     def hasReportPredicate(self):
         return self.conceptManager['hasreport']