Fix regression from 5e8d57bec1

0 is a false value, so shortcutting no longer works.
Update other places in the code that assumed graph was the default.

rules/helpers.go

@@ -159,6 +159,6 @@ func TableLinkForExpression(expr string) string {
 // GraphLinkForExpression creates an escaped relative link to the graph view of
 // the provided expression.
 func GraphLinkForExpression(expr string) string {
-	urlData := url.QueryEscape(fmt.Sprintf(`[{"expr":%q}]`, expr))
+	urlData := url.QueryEscape(fmt.Sprintf(`[{"expr":%q,"tab":0}]`, expr))
 	return fmt.Sprintf("/graph#%s", strings.Replace(urlData, "+", "%20", -1))
 }

templates/templates_test.go

@@ -135,7 +135,7 @@ func TestTemplateExpansion(t *testing.T) {
 		{
 			// graphLink.
 			text:   "{{ graphLink \"up\" }}",
-			output: "/graph#%5B%7B%22expr%22%3A%22up%22%7D%5D",
+			output: "/graph#%5B%7B%22expr%22%3A%22up%22%2C%22tab%22%3A0%7D%5D",
 		},
 		{
 			// tableLink.

web/static/js/graph.js

@@ -58,7 +58,9 @@ Prometheus.Graph.prototype.initialize = function() {
   self.options["id"] = self.id;
   self.options["range_input"] = self.options["range_input"] || "1h";
   self.options["stacked_checked"] = self.options["stacked"] ? "checked" : "";
-  self.options["tab"] = self.options["tab"] || 1;
+  if (self.options["tab"] === undefined) {
+    self.options["tab"] = 1;
+  }
 
   // Draw graph controls and container from Handlebars template.
 
@@ -78,13 +80,13 @@ Prometheus.Graph.prototype.initialize = function() {
   self.consoleTab = graphWrapper.find(".console");
   self.graphTab   = graphWrapper.find(".graph_container");
   self.tabs = graphWrapper.find(".tabs");
-  self.tab  = $(self.tabs.find("> div")[self.options["tab"]]); // active tab
+  self.tab = $(self.tabs.find("> div")[self.options["tab"]]); // active tab
 
   self.tabs.tabs({
     active: self.options["tab"],
     activate: function(e, ui) {
       storeGraphOptionsInUrl();
-      self.tab = ui.newPanel
+      self.tab = ui.newPanel;
       if (self.tab.hasClass("reload")) { // reload if flagged with class "reload"
         self.submitQuery();
       }

web/static/js/prom_console.js

@@ -577,7 +577,7 @@ PromConsole._chooseNameFunction = function(data) {
 PromConsole._graphsToSlashGraphURL = function(exprs) {
   var data = [];
   for (var i = 0; i < exprs.length; ++i) {
-    data.push({'expr' : exprs[i]});
+    data.push({'expr': exprs[i], 'tab': 0});
   }
   return '/graph#' + encodeURIComponent(JSON.stringify(data));