Add support for announcement channels

Closes #222

DiscordChatExporter.Cli/Commands/ExportGuildCommand.cs

@@ -26,7 +26,7 @@ namespace DiscordChatExporter.Cli.Commands
             var channels = await DataService.GetGuildChannelsAsync(GetToken(), GuildId);
 
             // Filter and order channels
-            channels = channels.Where(c => c.Type == ChannelType.GuildTextChat).OrderBy(c => c.Name).ToArray();
+            channels = channels.Where(c => c.Type.IsExportable()).OrderBy(c => c.Name).ToArray();
 
             // Loop through channels
             foreach (var channel in channels)

DiscordChatExporter.Cli/Commands/GetChannelsCommand.cs

@@ -24,7 +24,7 @@ namespace DiscordChatExporter.Cli.Commands
             var channels = await DataService.GetGuildChannelsAsync(GetToken(), GuildId);
 
             // Filter and order channels
-            channels = channels.Where(c => c.Type == ChannelType.GuildTextChat).OrderBy(c => c.Name).ToArray();
+            channels = channels.Where(c => c.Type.IsExportable()).OrderBy(c => c.Name).ToArray();
 
             // Print result
             foreach (var channel in channels)

DiscordChatExporter.Core.Models/ChannelType.cs

@@ -1,6 +1,7 @@
 namespace DiscordChatExporter.Core.Models
 {
     // https://discordapp.com/developers/docs/resources/channel#channel-object-channel-types
+    // Order of enum fields needs to match the order in the docs.
 
     public enum ChannelType
     {
@@ -8,6 +9,8 @@
         DirectTextChat,
         GuildVoiceChat,
         DirectGroupTextChat,
-        Category
+        GuildCategory,
+        GuildNews,
+        GuildStore
     }
 }

DiscordChatExporter.Core.Models/Extensions.cs

@@ -4,6 +4,13 @@ namespace DiscordChatExporter.Core.Models
 {
     public static class Extensions
     {
+        public static bool IsExportable(this ChannelType channelType) =>
+            channelType == ChannelType.GuildTextChat ||
+            channelType == ChannelType.DirectTextChat ||
+            channelType == ChannelType.DirectGroupTextChat ||
+            channelType == ChannelType.GuildNews ||
+            channelType == ChannelType.GuildStore;
+
         public static string GetFileExtension(this ExportFormat format) =>
             format switch
             {

DiscordChatExporter.Gui/Converters/DateTimeOffsetToDateTimeConverter.cs

@@ -4,25 +4,25 @@ using System.Windows.Data;
 
 namespace DiscordChatExporter.Gui.Converters
 {
-    [ValueConversion(typeof(DateTimeOffset), typeof(DateTime))]
+    [ValueConversion(typeof(DateTimeOffset?), typeof(DateTime?))]
     public class DateTimeOffsetToDateTimeConverter : IValueConverter
     {
         public static DateTimeOffsetToDateTimeConverter Instance { get; } = new DateTimeOffsetToDateTimeConverter();
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
             if (value is DateTimeOffset dateTimeOffsetValue)
                 return dateTimeOffsetValue.DateTime;
 
-            return default(DateTime);
+            return default(DateTime?);
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
         {
             if (value is DateTime dateTimeValue)
                 return new DateTimeOffset(dateTimeValue);
 
-            return default(DateTimeOffset);
+            return default(DateTimeOffset?);
         }
     }
 }

DiscordChatExporter.Gui/ViewModels/RootViewModel.cs

@@ -201,14 +201,14 @@ namespace DiscordChatExporter.Gui.ViewModels
                     var channels = await _dataService.GetGuildChannelsAsync(token, guild.Id);
 
                     // Get category channels
-                    var categoryChannels = channels.Where(c => c.Type == ChannelType.Category).ToArray();
+                    var categoryChannels = channels.Where(c => c.Type == ChannelType.GuildCategory).ToArray();
 
-                    // Get text channels
-                    var textChannels = channels.Where(c => c.Type == ChannelType.GuildTextChat).ToArray();
+                    // Get exportable channels
+                    var exportableChannels = channels.Where(c => c.Type.IsExportable()).ToArray();
 
                     // Create channel view models
                     var channelViewModels = new List<ChannelViewModel>();
-                    foreach (var channel in textChannels)
+                    foreach (var channel in exportableChannels)
                     {
                         // Get category
                         var category = categoryChannels.FirstOrDefault(c => c.Id == channel.ParentId)?.Name;