add a way to group raygun errors with parametrized messages

plugins/c9.ide.errorhandler/raygun.js

@@ -1422,6 +1422,19 @@ window.TraceKit = TraceKit;
     'Script error.': {},
     'DealPly is not defined': { factor: 10e5 }
   };
+  var groupedErrors = [{
+    regex: /^((?:Project|User) with id ')(\d+)(' does not exist)/i,
+    pullOut: { 1: 'id' }
+  }, {
+    regex: /^(Failed to execute 'send' on 'XMLHttpRequest': Failed to load)([\s\S]*)/i,
+    pullOut: { 1: 'url' }
+  }, {
+    regex: /^(Cannot GET \/)([\s\S]*)/i,
+    pullOut: { 1: 'url' }
+  }, {
+    regex: /^(Error whilst parsing: Unexpected end whilst parsing xpath \/)([\s\S]*)/i,
+    pullOut: { 1: 'apfStuff' }
+  }];
   function processUnhandledException(stackTrace, options) {
     var stack = [],
         qs = {};
@@ -1477,6 +1490,22 @@ window.TraceKit = TraceKit;
     
     // c9!
     var message = custom_message || stackTrace.message || options.status || 'Error with empty message';
+    
+    groupedErrors.some(function(g) {
+      if (g.regex.test(message)) {
+        var parts = message.split(g.regex);
+        message = "";
+        parts.forEach(function(p, i) {
+          if (g.pullOut[i - 1]) {
+            finalCustomData[g.pullOut[i - 1]] = p;
+          } else {
+            message += p;
+          }
+        });
+        return true;
+      }
+    });
+    
     if (blackListedErrors.hasOwnProperty(message)) {
         var count = (blackListedErrors[message].count || 0) + 1;
         blackListedErrors[message].count = count;