re-factoring, added limit on story cache size.

git-svn-id: file:///tmp/snv/trunk@23 12951d8a-c33d-4b7c-b961-822215c816

chrome/content/TODO.txt

@@ -5,3 +5,8 @@ caching, notifier-observer -- done
 new UI, icons -- done
 toolbar button -- done
 put license --done
+
+modify background colors to indicate new and read stories
+implement search
+new interface to navigate containers, topics and categories
+make configuration screen

chrome/content/diggsidebar.js

@@ -22,24 +22,26 @@
 var DiggSidebar = {
     homepageURL: "http://code.google.com/p/digg-sidebar/",
     prefs: Application.extensions.get("diggsidebar@abhinavsarkar.net").prefs,
+    observerService: Components.classes["@mozilla.org/observer-service;1"]
+        .getService(Components.interfaces.nsIObserverService),
     storyListRefreshEventTopic: "extension-diggsidebar-abhinavsarkar-net-storylist-refresh",
+    updateInterval: 1000,
+    updateIntervalDecay: 0,
+    shownStoriesCount: 30,//make configurable
+    cachedStoriesCount: 1000,//make configurable
+    categories: ["All", "Popular", "Upcoming", "Hot", "Top"],
+
     endpoint: {
         container: null,
         topic: null,
         category: "all"
     },
-    updateInterval: 1000,
-    updateIntervalDecay: 0,
     lastUpdateAt: new Date().getTime(),
-    shownStoriesCount: 30,
-    categories: ["All", "Popular", "Upcoming", "Hot", "Top"],
     timerId: null,
     storyIds: [],
     refreshing: false,
     stories: [],
     expandedStory: null,
-    observerService: Components.classes["@mozilla.org/observer-service;1"]
-        .getService(Components.interfaces.nsIObserverService),
 
     $ce: function (tagName) {
         return document.createElement(tagName);
@@ -84,21 +86,19 @@ var DiggSidebar = {
             var cmenupopup = DiggSidebar.$ce("menupopup");
             cmenupopup.setAttribute("id", container.short_name + "Popup");
 
-            DiggSidebar.categories.forEach(
-                function (category) {
-                    var cmenuitem = DiggSidebar.$ce("menuitem");
-                    with (cmenuitem) {
-                        setAttribute("label", category);
-                        setAttribute("value",
-                            "/container/" + container.short_name +
-                            "/" + category.toLowerCase());
-                        setAttribute("accesskey", category.charAt(0));
-                        setAttribute("oncommand",
-                            "DiggSidebar.setEndPoint(this.value)");
-                    }
-                    cmenupopup.appendChild(cmenuitem);
+            DiggSidebar.categories.forEach(function (category) {
+                var cmenuitem = DiggSidebar.$ce("menuitem");
+                with (cmenuitem) {
+                    setAttribute("label", category);
+                    setAttribute("value",
+                        "/container/" + container.short_name +
+                        "/" + category.toLowerCase());
+                    setAttribute("accesskey", category.charAt(0));
+                    setAttribute("oncommand",
+                        "DiggSidebar.setEndPoint(this.value)");
                 }
-            );
+                cmenupopup.appendChild(cmenuitem);
+            });
             cmenupopup.appendChild(DiggSidebar.$ce("menuseparator"));
             var topics = container.topics;
             topics.forEach(function (topic) {
@@ -159,14 +159,14 @@ var DiggSidebar = {
             DiggSidebar.Utils.removeAllChildren(DiggSidebar.UI.storyListBox);
         }
 
+        var now = new Date();
+
         filteredStories.forEach(function (story, index) {
             if (index < DiggSidebar.shownStoriesCount) {
-                var now = new Date();
-                if (story.promote_date != null) {
-                    var then = new Date(story.promote_date * 1000);
-                } else {
-                    var then = new Date(story.submit_date * 1000);
-                }
+                var then = (story.promote_date != null) ?
+                    new Date(story.promote_date * 1000) :
+                    new Date(story.submit_date * 1000);
+
                 var diff = Math.max(now - then, 0);
 
                 var hr = Math.floor(diff / (1000 * 3600));
@@ -209,7 +209,10 @@ var DiggSidebar = {
                 newStoryIds.push(story.id);
             }
         });
-        DiggSidebar.storyIds = DiggSidebar.storyIds.concat(newStoryIds);
+        DiggSidebar.storyIds = newStoryIds.concat(DiggSidebar.storyIds);
+        if (DiggSidebar.storyIds.length > DiggSidebar.cachedStoriesCount) {
+            DiggSidebar.storyIds.length = DiggSidebar.cachedStoriesCount;
+        }
     },
 
     showDescription: function (storyId) {
@@ -232,22 +235,30 @@ var DiggSidebar = {
             var ep = DiggSidebar.prefs.get("endpoint").value || "";
 
             DiggSidebar.indicateActivity();
-            DiggSidebar.fetchData("http://services.digg.com/stories" +
-                ep.replace(/\/all/g, "") + "?count=30" + "&type=json" +
+            DiggSidebar.fetchData(
+                "http://services.digg.com/stories" + ep.replace(/\/all/g, "") +
+                "?count=30" + "&type=json" +
                 "&appkey=" + encodeURIComponent(DiggSidebar.homepageURL),
 
                 function (e) {
                     var stories = DiggSidebar.Utils.decodeJson(e.target.responseText).stories;
-                    stories.forEach(function (story) { story.id = parseInt(story.id); });
-                    
-                    var newStories = stories.filter(function (story) {
-                        return DiggSidebar.storyIds.indexOf(story.id) == -1;
+                    stories.forEach(function (story) {
+                        story.id = parseInt(story.id);
                     });
+
+                    var newStories = [
+                        story for each (story in stories)
+                        if (DiggSidebar.storyIds.indexOf(story.id) == -1)];
+
                     newStories.forEach(function (story) {
                         story.category = DiggSidebar.endpoint.category;
                         story.read = false;
                     });
                     DiggSidebar.stories = newStories.concat(DiggSidebar.stories);
+                    if (DiggSidebar.stories.length > DiggSidebar.cachedStoriesCount) {
+                        DiggSidebar.stories.length = DiggSidebar.cachedStoriesCount;
+                    }
+
                     DiggSidebar.observerService.notifyObservers(
                         null, DiggSidebar.storyListRefreshEventTopic, null);
 
@@ -268,7 +279,8 @@ var DiggSidebar = {
 
     createMenu: function () {
         DiggSidebar.indicateActivity();
-        DiggSidebar.fetchData("http://services.digg.com/containers" + "?type=json" +
+        DiggSidebar.fetchData(
+            "http://services.digg.com/containers" + "?type=json" +
             "&appkey=" + encodeURIComponent(DiggSidebar.homepageURL),
             DiggSidebar.populateMenu, DiggSidebar.errorHandler);
     },
@@ -295,12 +307,9 @@ var DiggSidebar = {
             sum += weights[i] * diff;
         }
         var newUpdateInterval = Math.round(
-            sum * 1000 / weights
-                .splice(0, Math.min(4, stories.length - 1))
-                .reduce(function (a, b) {
-                    return a + b;
-                })
-        );
+            sum * 1000 /
+            weights.slice(0, Math.min(4, stories.length - 1))
+                .reduce(function (a, b) a + b));
 
         if (newUpdateInterval > 0) {
             var previousUpdateInterval = DiggSidebar.updateInterval;
@@ -316,8 +325,8 @@ var DiggSidebar = {
     },
 
     calculateTimeout: function () {
-        return Math.round(
-            DiggSidebar.updateInterval * (Math.pow(1.5, DiggSidebar.updateIntervalDecay)));
+        return Math.round(DiggSidebar.updateInterval *
+            Math.pow(1.5, DiggSidebar.updateIntervalDecay));
     },
 
     setEndPoint: function (ep) {