Initial code commit

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
+    </startup>
+</configuration>

Program.cs

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+using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Windows.Forms;
+using Wallcat.Services;
+using Wallcat.Util;
+
+namespace Wallcat
+{
+    // TODO: Remember Channel
+    // TODO: Update Wallpaper Daily
+    // TODO: Make cat blink when busy
+
+    internal static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        private static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new MyCustomApplicationContext());
+        }
+    }
+
+    public class MyCustomApplicationContext : ApplicationContext
+    {
+        private readonly NotifyIcon _trayIcon;
+        private readonly WallcatService _wallcatService;
+
+        private Channel CurrentChannel { get; set; }
+        private Wallpaper CurrentWallpaper { get; set; }
+
+        public MyCustomApplicationContext()
+        {
+            _wallcatService = new WallcatService();
+
+            var contextMenu = new ContextMenu();
+            contextMenu.MenuItems.Add(new MenuItem("Channels") { Enabled = false });
+            var channels = _wallcatService.GetChannels();
+            foreach (var channel in channels)
+            {
+                contextMenu.MenuItems.Add(new MenuItem(channel.title, SelectChannel) { Tag = channel });
+            }
+            SelectChannel(new MenuItem { Tag = channels.FirstOrDefault(x => x.isDefault)}, null);
+            contextMenu.MenuItems.Add(new MenuItem("-") { Enabled = false });
+            contextMenu.MenuItems.Add(new MenuItem("Credit", Website));
+            contextMenu.MenuItems.Add(new MenuItem("Exit", Exit));
+
+            // Initialize Tray Icon
+            _trayIcon = new NotifyIcon
+            {
+                Icon = Resources.AppIcon,
+                ContextMenu = contextMenu,
+                Visible = true
+            };
+        }
+
+        private void SelectChannel(object sender, EventArgs e)
+        {
+            var channel = (Channel)((MenuItem)sender).Tag;
+            if (channel == null) return;
+            var wallpaper = _wallcatService.GetWallpaper(channel.id);
+            if (wallpaper.id == CurrentWallpaper?.id) return;
+            var filePath = DownloadFile.Get(wallpaper.url.o);
+            SetWallpaper.Apply(filePath, SetWallpaper.Style.Span);
+
+            CurrentChannel = channel;
+            CurrentWallpaper = wallpaper;
+        }
+
+        private static void Website(object sender, EventArgs e)
+        {
+            Process.Start("https://wall.cat/");
+        }
+
+        private void Exit(object sender, EventArgs e)
+        {
+            // Hide tray icon, otherwise it will remain shown until user mouses over it
+            _trayIcon.Visible = false;
+
+            Application.Exit();
+        }
+    }
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Wallcat")]
+[assembly: AssemblyDescription("Unofficial Wallcat for Windows")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Paito Anderson")]
+[assembly: AssemblyProduct("Wallcat")]
+[assembly: AssemblyCopyright("Copyright © Paito Anderson 2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("737b333b-a79a-4dd3-8ade-fb28eea6bfef")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

README.md

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+Unofficial Wallcat for Windows
+==============================
+
+![Demo](https://github.com/PaitoAnderson/WallcatWindows/raw/master/demo.gif)

Resources.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <data name="AppIcon" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>Resources\AppIcon.ico;System.Drawing.Icon, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
+</root>

Services/IWallcatService.cs

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+
+namespace Wallcat.Services
+{
+    public interface IWallcatService
+    {
+        Channel[] GetChannels();
+
+        Wallpaper GetWallpaper(string channelId);
+    }
+
+    public class Channel
+    {
+        public string id { get; set; }
+        public string title { get; set; }
+        public bool isDefault { get; set; }
+    }
+
+    public class Wallpaper
+    {
+        public string id { get; set; }
+        public string title { get; set; }
+        public WallpaperUrls url { get; set; }
+
+        public string sourceUrl { get; set; }
+
+        public string webLocation { get; set; }
+    }
+
+    public class WallpaperUrls
+    {
+        public string s { get; set; }
+        public string m { get; set; }
+        public string l { get; set; }
+        public string o { get; set; }
+    }
+}