added an update checker

it will poll the github latest release url once per week
and will replace the help icon on main window corner
with a shiny yellow New icon that when clicked
will display current and latest version number
prompting the user to upgrade.

it is disabled by default. to enable you have to check
a checkbox in settings . user may also manually
initiate the update check proccess.

BrowserSelect/BrowserSelect.csproj

@@ -88,6 +88,7 @@
     <Compile Include="IconExtractor.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UpdateChecker.cs" />
     <Compile Include="VButton.cs">
       <SubType>Component</SubType>
     </Compile>
@@ -119,7 +120,9 @@
       <DependentUpon>Resources.resx</DependentUpon>
       <DesignTime>True</DesignTime>
     </Compile>
-    <None Include="app.config" />
+    <None Include="app.config">
+      <SubType>Designer</SubType>
+    </None>
     <None Include="installer.nsi" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>
@@ -134,6 +137,7 @@
   <ItemGroup>
     <Content Include="bs.ico" />
     <Content Include="License.txt" />
+    <None Include="Resources\new-icon.png" />
     <None Include="Resources\bitcoin.png" />
     <None Include="Resources\Button-help-icon.png" />
   </ItemGroup>

BrowserSelect/Form1.cs

@@ -42,6 +42,13 @@ private void Form1_Load(object sender, EventArgs e)
             // create a wildcard rule for this domain (always button)
             _alwaysRule = generate_rule(Program.url);
 
+            // check for new version
+            if (Settings.Default.last_version != "nope")
+            {
+                btn_help.BackgroundImage = Resources.update_available;
+                btn_help.Click -= btn_help_Click;
+                btn_help.Click += btn_update_click;
+            }
             center_me();
         }
 
@@ -285,5 +292,16 @@ private void btn_help_Click(object sender, EventArgs e)
         {
             (new frm_help_main()).ShowDialog();
         }
+
+        void btn_update_click(object sender, EventArgs e)
+        {
+            var lv = Settings.Default.last_version;
+            var cv = Application.ProductVersion;
+            cv = cv.Remove(cv.Length - 2);
+            MessageBox.Show(String.Format(
+                "New Update Available!\nCurrent Version: {1}\nLast Version: {0}" +
+                "\nto Update download and install the new version from project's github.",
+                lv, cv));
+        }
     }
 }

BrowserSelect/Program.cs

@@ -3,6 +3,7 @@
 using System.Collections.Specialized;
 using System.Linq;
 using System.Text.RegularExpressions;
+using System.Threading.Tasks;
 using System.Windows.Forms;
 using BrowserSelect.Properties;
 
@@ -23,13 +24,21 @@ static void Main(string[] args)
             {
                 Settings.Default.Upgrade();
                 Settings.Default.UpdateSettings = false;
+                Settings.Default.last_version = "nope";
                 // to prevent nullreference in case settings file did not exist
                 if (Settings.Default.HideBrowsers == null)
                     Settings.Default.HideBrowsers = new StringCollection();
                 if (Settings.Default.AutoBrowser == null)
                     Settings.Default.AutoBrowser = new StringCollection();
                 Settings.Default.Save();
             }
+            // check for update
+            if (Settings.Default.check_update != "nope" &&
+                DateTime.Now.Subtract(time(Settings.Default.check_update)).TotalDays > 7)
+            {
+                var uc = new UpdateChecker();
+                Task.Factory.StartNew(() => uc.check());
+            }
             //checking if a url is being opened or app is ran from start menu (without arguments)
             if (args.Length > 0)
             {
@@ -73,6 +82,28 @@ static void Main(string[] args)
             Application.Run(new Form1());
         }
 
+        // from : http://stackoverflow.com/a/250400/1461004
+        public static double time()
+        {
+            return time(DateTime.Now);
+        }
+        public static DateTime time(string unixTimeStamp)
+        {
+            return time(double.Parse(unixTimeStamp));
+        }
+        public static DateTime time(double unixTimeStamp)
+        {
+            // Unix timestamp is seconds past epoch
+            System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
+            dtDateTime = dtDateTime.AddSeconds(unixTimeStamp).ToLocalTime();
+            return dtDateTime;
+        }
+        public static double time(DateTime dateTime)
+        {
+            return (TimeZoneInfo.ConvertTimeToUtc(dateTime) -
+                   new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc)).TotalSeconds;
+        }
+
 
         public static string Args2Str(List<string> args)
         {

BrowserSelect/Properties/Resources.resx

@@ -124,4 +124,7 @@
   <data name="Button-help-icon" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\Button-help-icon.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="update_available" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\new-icon.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
 </root>

BrowserSelect/Properties/Settings.settings

@@ -11,5 +11,11 @@
     <Setting Name="UpdateSettings" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">True</Value>
     </Setting>
+    <Setting Name="check_update" Type="System.String" Scope="User">
+      <Value Profile="(Default)">nope</Value>
+    </Setting>
+    <Setting Name="last_version" Type="System.String" Scope="User">
+      <Value Profile="(Default)">nope</Value>
+    </Setting>
   </Settings>
 </SettingsFile>

BrowserSelect/UpdateChecker.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Windows.Forms;
+using System.Windows.Forms.VisualStyles;
+using BrowserSelect.Properties;
+
+namespace BrowserSelect
+{
+    class UpdateChecker
+    {
+        public String CVer => current_version;
+        public String LVer => last_version;
+        public Boolean Checked => init;
+        public Boolean Updated => new_version();
+
+        private string current_version = "x";
+        private string last_version = "x";
+        private bool init = false;
+
+        public void check()
+        {
+            if (new_version())
+                Settings.Default.last_version = last_version;
+            if (Settings.Default.check_update != "nope")
+                Settings.Default.check_update = Program.time().ToString();
+            Settings.Default.Save();
+        }
+        string get_last_version()
+        {
+            // request to releases/latest redirects the user to /releases/tag.
+            // since tag is the version number we can get latest version from Location header
+            // and make a HEAD request instead of get to save bandwidth
+            var req = (HttpWebRequest)WebRequest.Create("https://github.com/zumoshi/BrowserSelect/releases/latest");
+            req.Method = "HEAD";
+            req.AllowAutoRedirect = false;
+            using (var res = req.GetResponse())
+            {
+                return res.Headers["Location"].Split('/').Last();
+            }
+        }
+
+        void get_versions()
+        {
+            try
+            {
+                last_version = get_last_version();
+                current_version = ((Func<String, String>)((x) => x.Substring(0, x.Length - 2)))(Application.ProductVersion);
+                init = true;
+            }
+            catch (Exception) { }
+        }
+
+        bool new_version()
+        {
+            if (!init)
+                get_versions();
+            return last_version != current_version;
+        }
+    }
+}

BrowserSelect/app.config

@@ -10,6 +10,12 @@
             <setting name="UpdateSettings" serializeAs="String">
                 <value>True</value>
             </setting>
+            <setting name="check_update" serializeAs="String">
+                <value>nope</value>
+            </setting>
+            <setting name="last_version" serializeAs="String">
+                <value>nope</value>
+            </setting>
         </BrowserSelect.Properties.Settings>
     </userSettings>
 </configuration>