Add uptime in webgui (fixes #1501)

gui/scripts/syncthing/core/controllers/syncthingController.js

@@ -1069,7 +1069,7 @@ angular.module('syncthing.core')
                         break;
                     }
                 }
-            };
+            }
 
             folders.sort();
             return folders;

gui/scripts/syncthing/core/filters/durationFilter.js

@@ -0,0 +1,35 @@
+/** convert amount of seconds to string format "d h m s" without zero values
+ * precision must be one of 'd', 'h', 'm', 's'(default)
+ * Example:
+ * {{121020003|duration}}     --> 1400d 16h 40m 3s
+ * {{121020003|duration:"m"}} --> 1400d 16h 40m
+ * {{121020003|duration:"h"}} --> 1400d 16h
+ * {{1|duration:"h"}}         --> <1h
+**/
+angular.module('syncthing.core')
+    .filter('duration', function () {
+        'use strict';
+
+        var SECONDS_IN = {"d": 86400, "h": 3600, "m": 60,  "s": 1};
+        return function (input, precision) {
+            var result = "";
+            if (!precision) {
+                precision = "s";
+            }
+            input = parseInt(input, 10);
+            for (var k in SECONDS_IN) {
+                var t = (input/SECONDS_IN[k] | 0); // Math.floor
+
+                if (t > 0) {
+                    result += " " + t + k; 
+                }
+
+                if (precision == k) {
+                    return result ? result : "<1" + k; 
+                } else {
+                    input %= SECONDS_IN[k];
+                }
+            }
+            return "[Error: incorrect usage, precision must be one of " + Object.keys(SECONDS_IN) + "]";
+        };
+    });