Update version

Fixes #88

Changelog.md

@@ -1,9 +1,18 @@
+### v2.8 (03-Nov-2018)
+
+- Added support for partitioning which lets you split the output into multiple files by setting the partition message limit (`-p` parameter for CLI).
+- Exported file will no longer open automatically on completion.
+- Reduced amount of memory used during exporting.
+- Disabled message grouping in PlainText export.
+- Improved encoding of newlines in CSV export.
+- Improved error messages in the GUI app during crashes.
+
 ### v2.7 (14-Sep-2018)
 
 - Updated instructions on how to obtain the user token.
-- Expanded CLI with new commands: `channels` (get a list of channels in a guild), `dms` (get a list of DM channels), `guilds` (get a list of guilds), on top of `export` (export chatlog).
+- Expanded CLI with new commands: `channels` (get a list of channels in a guild), `dm` (get a list of DM channels), `guilds` (get a list of guilds), on top of `export` (export chatlog).
 - Improved help text and error messages in CLI.
-- In CLI, if the provided output file path is a directory, a file name will be generated and appended to it automatically.
+- In CLI, the file name will be automatically generated if the provided output file path is a directory.
 
 ### v2.6 (25-Jul-2018)
 

DiscordChatExporter.Cli/Container.cs

@@ -14,7 +14,6 @@ namespace DiscordChatExporter.Cli
             // Services
             SimpleIoc.Default.Register<IDataService, DataService>();
             SimpleIoc.Default.Register<IExportService, ExportService>();
-            SimpleIoc.Default.Register<IMessageGroupService, MessageGroupService>();
             SimpleIoc.Default.Register<ISettingsService, SettingsService>();
             SimpleIoc.Default.Register<IUpdateService, UpdateService>();
         }

DiscordChatExporter.Cli/DiscordChatExporter.Cli.csproj

@@ -3,7 +3,7 @@
     <PropertyGroup>
         <OutputType>Exe</OutputType>
         <TargetFramework>net461</TargetFramework>
-        <Version>2.7</Version>
+        <Version>2.8</Version>
         <Company>Tyrrrz</Company>
         <Copyright>Copyright (c) 2017-2018 Alexey Golub</Copyright>
         <ApplicationIcon>..\favicon.ico</ApplicationIcon>

DiscordChatExporter.Cli/Program.cs

@@ -43,8 +43,7 @@ namespace DiscordChatExporter.Cli
                 typeof(ExportChatOptions),
                 typeof(GetChannelsOptions),
                 typeof(GetDirectMessageChannelsOptions),
-                typeof(GetGuildsOptions),
-                //typeof(UpdateAppOptions)
+                typeof(GetGuildsOptions)
             };
 
             // Parse command line arguments
@@ -55,7 +54,6 @@ namespace DiscordChatExporter.Cli
             parsedArgs.WithParsed<GetChannelsOptions>(o => new GetChannelsVerb(o).Execute());
             parsedArgs.WithParsed<GetDirectMessageChannelsOptions>(o => new GetDirectMessageChannelsVerb(o).Execute());
             parsedArgs.WithParsed<GetGuildsOptions>(o => new GetGuildsVerb(o).Execute());
-            parsedArgs.WithParsed<UpdateAppOptions>(o => new UpdateAppVerb(o).Execute());
 
             // Show token help if help requested or no verb specified
             parsedArgs.WithNotParsed(errs =>

DiscordChatExporter.Cli/Verbs/ExportChatVerb.cs

@@ -21,7 +21,6 @@ namespace DiscordChatExporter.Cli.Verbs
             var container = new Container();
             var settingsService = container.Resolve<ISettingsService>();
             var dataService = container.Resolve<IDataService>();
-            var messageGroupService = container.Resolve<IMessageGroupService>();
             var exportService = container.Resolve<IExportService>();
 
             // Configure settings
@@ -30,37 +29,20 @@ namespace DiscordChatExporter.Cli.Verbs
             if (Options.MessageGroupLimit > 0)
                 settingsService.MessageGroupLimit = Options.MessageGroupLimit;
 
-            // Get channel and guild
-            var channel = await dataService.GetChannelAsync(Options.GetToken(), Options.ChannelId);
-            var guild = channel.GuildId == Guild.DirectMessages.Id
-                ? Guild.DirectMessages
-                : await dataService.GetGuildAsync(Options.GetToken(), channel.GuildId);
+            // Get chat log
+            var chatLog = await dataService.GetChatLogAsync(Options.GetToken(), Options.ChannelId, 
+                Options.After, Options.Before);
 
             // Generate file path if not set
             var filePath = Options.FilePath;
             if (filePath == null || filePath.EndsWith("/") || filePath.EndsWith("\\"))
             {
-                filePath += $"{guild.Name} - {channel.Name}.{Options.ExportFormat.GetFileExtension()}"
+                filePath += $"{chatLog.Guild.Name} - {chatLog.Channel.Name}.{Options.ExportFormat.GetFileExtension()}"
                     .Replace(Path.GetInvalidFileNameChars(), '_');
             }
 
-            // TODO: extract this to make it reusable across implementations
-            // Get messages
-            var messages =
-                await dataService.GetChannelMessagesAsync(Options.GetToken(), channel.Id,
-                    Options.After, Options.Before);
-
-            // Group messages
-            var messageGroups = messageGroupService.GroupMessages(messages);
-
-            // Get mentionables
-            var mentionables = await dataService.GetMentionablesAsync(Options.GetToken(), guild.Id, messages);
-
-            // Create log
-            var log = new ChatLog(guild, channel, Options.After, Options.Before, messageGroups, mentionables);
-
             // Export
-            exportService.Export(Options.ExportFormat, filePath, log);
+            exportService.ExportChatLog(chatLog, filePath, Options.ExportFormat, Options.PartitionLimit);
 
             // Print result
             Console.WriteLine($"Exported chat to [{filePath}]");

DiscordChatExporter.Cli/Verbs/Options/ExportChatOptions.cs

@@ -22,6 +22,9 @@ namespace DiscordChatExporter.Cli.Verbs.Options
         [Option("before", Default = null, HelpText = "Limit to messages sent before this date.")]
         public DateTime? Before { get; set; }
 
+        [Option('p', "partition", Default = null, HelpText = "Split output into partitions limited to this number of messages.")]
+        public int? PartitionLimit { get; set; }
+
         [Option("dateformat", Default = null, HelpText = "Date format used in output.")]
         public string DateFormat { get; set; }
 

DiscordChatExporter.Cli/Verbs/Options/UpdateAppOptions.cs

@@ -1,9 +0,0 @@
-using CommandLine;
-
-namespace DiscordChatExporter.Cli.Verbs.Options
-{
-    [Verb("update", HelpText = "Updates this application to the latest version.")]
-    public class UpdateAppOptions
-    {
-    }
-}

DiscordChatExporter.Cli/Verbs/UpdateAppVerb.cs

@@ -1,38 +0,0 @@
-using System;
-using System.Threading.Tasks;
-using DiscordChatExporter.Cli.Verbs.Options;
-using DiscordChatExporter.Core.Services;
-
-namespace DiscordChatExporter.Cli.Verbs
-{
-    public class UpdateAppVerb : Verb<UpdateAppOptions>
-    {
-        public UpdateAppVerb(UpdateAppOptions options) 
-            : base(options)
-        {
-        }
-
-        public override async Task ExecuteAsync()
-        {
-            // Get update service
-            var container = new Container();
-            var updateService = container.Resolve<IUpdateService>();
-
-            // TODO: this is configured only for GUI
-            // Get update version
-            var updateVersion = await updateService.CheckPrepareUpdateAsync();
-
-            if (updateVersion != null)
-            {
-                Console.WriteLine($"Updating to version {updateVersion}");
-
-                updateService.NeedRestart = false;
-                updateService.FinalizeUpdate();
-            }
-            else
-            {
-                Console.WriteLine("There are no application updates available.");
-            }
-        }
-    }
-}

DiscordChatExporter.Core/DiscordChatExporter.Core.csproj

@@ -2,7 +2,7 @@
 
     <PropertyGroup>
         <TargetFramework>net461</TargetFramework>
-        <Version>2.7</Version>
+        <Version>2.8</Version>
     </PropertyGroup>
 
     <ItemGroup>

DiscordChatExporter.Core/Models/ChatLog.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace DiscordChatExporter.Core.Models
 {
@@ -14,20 +13,18 @@ namespace DiscordChatExporter.Core.Models
 
         public DateTime? To { get; }
 
-        public IReadOnlyList<MessageGroup> MessageGroups { get; }
-
-        public int TotalMessageCount => MessageGroups.Sum(g => g.Messages.Count);
+        public IReadOnlyList<Message> Messages { get; }
 
         public Mentionables Mentionables { get; }
 
         public ChatLog(Guild guild, Channel channel, DateTime? from, DateTime? to,
-            IReadOnlyList<MessageGroup> messageGroups, Mentionables mentionables)
+            IReadOnlyList<Message> messages, Mentionables mentionables)
         {
             Guild = guild;
             Channel = channel;
             From = from;
             To = to;
-            MessageGroups = messageGroups;
+            Messages = messages;
             Mentionables = mentionables;
         }
 

DiscordChatExporter.Core/Models/Extensions.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace DiscordChatExporter.Core.Models
 {
@@ -31,5 +33,45 @@ namespace DiscordChatExporter.Core.Models
 
             throw new ArgumentOutOfRangeException(nameof(format));
         }
+
+        public static IReadOnlyList<ChatLog> SplitIntoPartitions(this ChatLog chatLog, int partitionLimit)
+        {
+            // If chat log has fewer messages than the limit - just return chat log in a list
+            if (chatLog.Messages.Count <= partitionLimit)
+                return new[] {chatLog};
+
+            var result = new List<ChatLog>();
+
+            // Loop through messages
+            var buffer = new List<Message>();
+            foreach (var message in chatLog.Messages)
+            {
+                // Add message to buffer
+                buffer.Add(message);
+
+                // If reached the limit - split and reset buffer
+                if (buffer.Count >= partitionLimit)
+                {
+                    // Add to result
+                    var chatLogPartition = new ChatLog(chatLog.Guild, chatLog.Channel, chatLog.From, chatLog.To, buffer,
+                        chatLog.Mentionables);
+                    result.Add(chatLogPartition);
+
+                    // Reset the buffer instead of clearing to avoid mutations on existing references
+                    buffer = new List<Message>();
+                }
+            }
+
+            // Add what's remaining in buffer
+            if (buffer.Any())
+            {
+                // Add to result
+                var chatLogPartition = new ChatLog(chatLog.Guild, chatLog.Channel, chatLog.From, chatLog.To, buffer,
+                    chatLog.Mentionables);
+                result.Add(chatLogPartition);
+            }
+
+            return result;
+        }
     }
 }

DiscordChatExporter.Core/Models/MessageGroup.cs

@@ -1,23 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace DiscordChatExporter.Core.Models
-{
-    public class MessageGroup
-    {
-        public User Author { get; }
-
-        public DateTime Timestamp { get; }
-
-        public IReadOnlyList<Message> Messages { get; }
-
-        public MessageGroup(User author, DateTime timestamp, IReadOnlyList<Message> messages)
-        {
-            Author = author;
-            Timestamp = timestamp;
-            Messages = messages;
-        }
-
-        public override string ToString() => $"{Author.FullName} | {Timestamp} | {Messages.Count} messages";
-    }
-}

DiscordChatExporter.Core/Resources/ExportTemplates/Csv.csv

@@ -1,12 +1,10 @@
 Author;Date;Content;Attachments;
-{{~ for group in Model.MessageGroups -}}
-  {{- for message in group.Messages -}}
-    {{- message.Author.FullName }};
+{{~ for message in Model.Messages -}}
+  {{- }}"{{ message.Author.FullName }}";
 
-    {{- message.Timestamp | FormatDate }};
+  {{- }}"{{ message.Timestamp | FormatDate }}";
 
-    {{- message.Content | FormatContent }};
+  {{- }}"{{ message.Content | FormatContent }}";
 
-    {{- message.Attachments | array.map "Url" | array.join "," }};
-  {{~ end -}}
-{{- end -}}
+  {{- }}"{{ message.Attachments | array.map "Url" | array.join "," }}";
+{{~ end -}}

DiscordChatExporter.Core/Resources/ExportTemplates/Html/Core.html

@@ -24,7 +24,7 @@
             <div class="info__channel-topic">{{ Model.Channel.Topic | html.escape }}</div>
         {{~ end ~}}
 
-        <div class="info__channel-message-count">{{ Model.TotalMessageCount | Format "N0" }} messages</div>
+        <div class="info__channel-message-count">{{ Model.Messages | array.size | Format "N0" }} messages</div>
         
         {{~ if Model.From || Model.To ~}}
             <div class="info__channel-date-range">
@@ -42,7 +42,7 @@
 
 {{~ # Log ~}}
 <div class="chatlog">
-    {{~ for group in Model.MessageGroups ~}}
+    {{~ for group in Model.Messages | GroupMessages ~}}
         <div class="chatlog__message-group">
             {{~ # Avatar ~}}
             <div class="chatlog__author-avatar-container">

DiscordChatExporter.Core/Resources/ExportTemplates/PlainText.txt

@@ -3,23 +3,19 @@
 Guild:    {{ Model.Guild.Name }}
 Channel:  {{ Model.Channel.Name }}
 Topic:    {{ Model.Channel.Topic }}
-Messages: {{ Model.TotalMessageCount | Format "N0" }}
+Messages: {{ Model.Messages | array.size | Format "N0" }}
 Range:    {{ if Model.From }}{{ Model.From | FormatDate }} {{ end }}{{ if Model.From || Model.To }}->{{ end }}{{ if Model.To }} {{ Model.To | FormatDate }}{{ end }}
 ==============================================================
 
 {{~ # Log ~}}
-{{~ for group in Model.MessageGroups ~}}
+{{~ for message in Model.Messages ~}}
   {{~ # Author name and timestamp ~}}
-  {{~ }}[{{ group.Timestamp | FormatDate }}] {{ group.Author.FullName }}
-  {{~ # Messages ~}}
-  {{~ for message in group.Messages ~}}
-    {{~ # Content ~}}
-    {{~ message.Content | FormatContent }}
-    {{~ # Attachments ~}}
-    {{~ for attachment in message.Attachments ~}}
-      {{~ attachment.Url }}
-    {{~ end ~}}
+  {{~ }}[{{ message.Timestamp | FormatDate }}] {{ message.Author.FullName }}
+  {{~ # Content ~}}
+  {{~ message.Content | FormatContent }}
+  {{~ # Attachments ~}}
+  {{~ for attachment in message.Attachments ~}}
+    {{~ attachment.Url }}
   {{~ end ~}}
 
-
 {{~ end ~}}

DiscordChatExporter.Core/Services/DataService.cs

@@ -65,6 +65,10 @@ namespace DiscordChatExporter.Core.Services
 
         public async Task<Guild> GetGuildAsync(AuthToken token, string guildId)
         {
+            // Special case for direct messages pseudo-guild
+            if (guildId == Guild.DirectMessages.Id)
+                return Guild.DirectMessages;
+
             var response = await GetApiResponseAsync(token, "guilds", guildId);
             var guild = ParseGuild(response);
 
@@ -210,6 +214,33 @@ namespace DiscordChatExporter.Core.Services
             return new Mentionables(users, channels, roles);
         }
 
+        public async Task<ChatLog> GetChatLogAsync(AuthToken token, Guild guild, Channel channel,
+            DateTime? from = null, DateTime? to = null, IProgress<double> progress = null)
+        {
+            // Get messages
+            var messages = await GetChannelMessagesAsync(token, channel.Id, from, to, progress);
+
+            // Get mentionables
+            var mentionables = await GetMentionablesAsync(token, guild.Id, messages);
+
+            return new ChatLog(guild, channel, from, to, messages, mentionables);
+        }
+
+        public async Task<ChatLog> GetChatLogAsync(AuthToken token, string channelId,
+            DateTime? from = null, DateTime? to = null, IProgress<double> progress = null)
+        {
+            // Get channel
+            var channel = await GetChannelAsync(token, channelId);
+
+            // Get guild
+            var guild = channel.GuildId == Guild.DirectMessages.Id
+                ? Guild.DirectMessages
+                : await GetGuildAsync(token, channel.GuildId);
+
+            // Get the chat log
+            return await GetChatLogAsync(token, guild, channel, from, to, progress);
+        }
+
         public void Dispose()
         {
             _httpClient.Dispose();

DiscordChatExporter.Core/Services/ExportService.MessageGroup.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using DiscordChatExporter.Core.Models;
+
+namespace DiscordChatExporter.Core.Services
+{
+    public partial class ExportService
+    {
+        private class MessageGroup
+        {
+            public User Author { get; }
+
+            public DateTime Timestamp { get; }
+
+            public IReadOnlyList<Message> Messages { get; }
+
+            public MessageGroup(User author, DateTime timestamp, IReadOnlyList<Message> messages)
+            {
+                Author = author;
+                Timestamp = timestamp;
+                Messages = messages;
+            }
+        }
+    }
+}

DiscordChatExporter.Core/Services/ExportService.TemplateModel.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Drawing;
 using System.Globalization;
 using System.Linq;
@@ -18,12 +19,57 @@ namespace DiscordChatExporter.Core.Services
             private readonly ExportFormat _format;
             private readonly ChatLog _log;
             private readonly string _dateFormat;
+            private readonly int _messageGroupLimit;
 
-            public TemplateModel(ExportFormat format, ChatLog log, string dateFormat)
+            public TemplateModel(ExportFormat format, ChatLog log, string dateFormat, int messageGroupLimit)
             {
                 _format = format;
                 _log = log;
                 _dateFormat = dateFormat;
+                _messageGroupLimit = messageGroupLimit;
+            }
+
+            private IEnumerable<MessageGroup> GroupMessages(IEnumerable<Message> messages)
+            {
+                // Group adjacent messages by timestamp and author
+                var buffer = new List<Message>();
+                foreach (var message in messages)
+                {
+                    var groupFirst = buffer.FirstOrDefault();
+
+                    // Group break condition
+                    var breakCondition =
+                        groupFirst != null &&
+                        (
+                            message.Author.Id != groupFirst.Author.Id ||
+                            (message.Timestamp - groupFirst.Timestamp).TotalHours > 1 ||
+                            message.Timestamp.Hour != groupFirst.Timestamp.Hour ||
+                            buffer.Count >= _messageGroupLimit
+                        );
+
+                    // If condition is true - flush buffer
+                    if (breakCondition)
+                    {
+                        var group = new MessageGroup(groupFirst.Author, groupFirst.Timestamp, buffer);
+
+                        // Reset the buffer instead of clearing to avoid mutations on existing references
+                        buffer = new List<Message>();
+
+                        yield return group;
+                    }
+
+                    // Add message to buffer
+                    buffer.Add(message);
+                }
+
+                // Add what's remaining in buffer
+                if (buffer.Any())
+                {
+                    var groupFirst = buffer.First();
+                    var group = new MessageGroup(groupFirst.Author, groupFirst.Timestamp, buffer);
+
+                    yield return group;
+                }
             }
 
             private string HtmlEncode(string str) => WebUtility.HtmlEncode(str);
@@ -229,9 +275,6 @@ namespace DiscordChatExporter.Core.Services
 
             private string FormatContentCsv(string content)
             {
-                // New lines
-                content = content.Replace("\n", ", ");
-
                 // Escape quotes
                 content = content.Replace("\"", "\"\"");
 
@@ -310,6 +353,7 @@ namespace DiscordChatExporter.Core.Services
                 scriptObject.SetValue("Model", _log, true);
 
                 // Import functions
+                scriptObject.Import(nameof(GroupMessages), new Func<IEnumerable<Message>, IEnumerable<MessageGroup>>(GroupMessages));
                 scriptObject.Import(nameof(Format), new Func<IFormattable, string, string>(Format));
                 scriptObject.Import(nameof(FormatDate), new Func<DateTime, string>(FormatDate));
                 scriptObject.Import(nameof(FormatFileSize), new Func<long, string>(FormatFileSize));

DiscordChatExporter.Core/Services/ExportService.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System.Collections.Generic;
+using System.IO;
 using DiscordChatExporter.Core.Models;
 using Scriban;
 using Scriban.Runtime;
@@ -15,7 +16,7 @@ namespace DiscordChatExporter.Core.Services
             _settingsService = settingsService;
         }
 
-        public void Export(ExportFormat format, string filePath, ChatLog log)
+        private void ExportChatLogSingle(ChatLog chatLog, string filePath, ExportFormat format)
         {
             // Create template loader
             var loader = new TemplateLoader();
@@ -35,7 +36,9 @@ namespace DiscordChatExporter.Core.Services
             };
 
             // Create template model
-            var templateModel = new TemplateModel(format, log, _settingsService.DateFormat);
+            var templateModel = new TemplateModel(format, chatLog,
+                _settingsService.DateFormat, _settingsService.MessageGroupLimit);
+
             context.PushGlobal(templateModel.GetScriptObject());
 
             // Create directory
@@ -49,8 +52,50 @@ namespace DiscordChatExporter.Core.Services
                 // Configure output
                 context.PushOutput(new TextWriterOutput(output));
 
-                // Render template
-                template.Render(context);
+                // Render output
+                context.Evaluate(template.Page);
+            }
+        }
+
+        private void ExportChatLogPartitions(IReadOnlyList<ChatLog> partitions, string filePath, ExportFormat format)
+        {
+            // Split file path into components
+            var dirPath = Path.GetDirectoryName(filePath);
+            var fileNameWithoutExt = Path.GetFileNameWithoutExtension(filePath);
+            var fileExt = Path.GetExtension(filePath);
+
+            // Export each partition separately
+            var partitionNumber = 1;
+            foreach (var partition in partitions)
+            {
+                // Compose new file name
+                var partitionFilePath = $"{fileNameWithoutExt}-{partitionNumber}{fileExt}";
+
+                // Compose full file path
+                if (dirPath.IsNotBlank())
+                    partitionFilePath = Path.Combine(dirPath, partitionFilePath);
+
+                // Export
+                ExportChatLogSingle(partition, partitionFilePath, format);
+
+                // Increment partition number
+                partitionNumber++;
+            }
+        }
+
+        public void ExportChatLog(ChatLog chatLog, string filePath, ExportFormat format,
+            int? partitionLimit = null)
+        {
+            // If partitioning is disabled or there are fewer messages in chat log than the limit - process it without partitioning
+            if (partitionLimit == null || chatLog.Messages.Count <= partitionLimit)
+            {
+                ExportChatLogSingle(chatLog, filePath, format);
+            }
+            // Otherwise split into partitions and export separately
+            else
+            {
+                var partitions = chatLog.SplitIntoPartitions(partitionLimit.Value);
+                ExportChatLogPartitions(partitions, filePath, format);
             }
         }
     }

DiscordChatExporter.Core/Services/IDataService.cs

@@ -24,5 +24,11 @@ namespace DiscordChatExporter.Core.Services
 
         Task<Mentionables> GetMentionablesAsync(AuthToken token, string guildId,
             IEnumerable<Message> messages);
+
+        Task<ChatLog> GetChatLogAsync(AuthToken token, Guild guild, Channel channel,
+            DateTime? from = null, DateTime? to = null, IProgress<double> progress = null);
+
+        Task<ChatLog> GetChatLogAsync(AuthToken token, string channelId,
+            DateTime? from = null, DateTime? to = null, IProgress<double> progress = null);
     }
 }

DiscordChatExporter.Core/Services/IExportService.cs

@@ -4,6 +4,7 @@ namespace DiscordChatExporter.Core.Services
 {
     public interface IExportService
     {
-        void Export(ExportFormat format, string filePath, ChatLog log);
+        void ExportChatLog(ChatLog chatLog, string filePath, ExportFormat format,
+            int? partitionLimit = null);
     }
 }

DiscordChatExporter.Core/Services/IMessageGroupService.cs

@@ -1,10 +0,0 @@
-using System.Collections.Generic;
-using DiscordChatExporter.Core.Models;
-
-namespace DiscordChatExporter.Core.Services
-{
-    public interface IMessageGroupService
-    {
-        IReadOnlyList<MessageGroup> GroupMessages(IEnumerable<Message> messages);
-    }
-}

DiscordChatExporter.Core/Services/ISettingsService.cs

@@ -11,6 +11,7 @@ namespace DiscordChatExporter.Core.Services
 
         AuthToken LastToken { get; set; }
         ExportFormat LastExportFormat { get; set; }
+        int? LastPartitionLimit { get; set; }
 
         void Load();
         void Save();

DiscordChatExporter.Core/Services/MessageGroupService.cs

@@ -1,59 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-using DiscordChatExporter.Core.Models;
-
-namespace DiscordChatExporter.Core.Services
-{
-    public class MessageGroupService : IMessageGroupService
-    {
-        private readonly ISettingsService _settingsService;
-
-        public MessageGroupService(ISettingsService settingsService)
-        {
-            _settingsService = settingsService;
-        }
-
-        public IReadOnlyList<MessageGroup> GroupMessages(IEnumerable<Message> messages)
-        {
-            var result = new List<MessageGroup>();
-
-            // Group adjacent messages by timestamp and author
-            var groupBuffer = new List<Message>();
-            foreach (var message in messages)
-            {
-                var groupFirst = groupBuffer.FirstOrDefault();
-
-                // Group break condition
-                var breakCondition =
-                    groupFirst != null &&
-                    (
-                        message.Author.Id != groupFirst.Author.Id ||
-                        (message.Timestamp - groupFirst.Timestamp).TotalHours > 1 ||
-                        message.Timestamp.Hour != groupFirst.Timestamp.Hour ||
-                        groupBuffer.Count >= _settingsService.MessageGroupLimit
-                    );
-
-                // If condition is true - flush buffer
-                if (breakCondition)
-                {
-                    var group = new MessageGroup(groupFirst.Author, groupFirst.Timestamp, groupBuffer.ToArray());
-                    result.Add(group);
-                    groupBuffer.Clear();
-                }
-
-                // Add message to buffer
-                groupBuffer.Add(message);
-            }
-
-            // Add what's remaining in buffer
-            if (groupBuffer.Any())
-            {
-                var groupFirst = groupBuffer.First();
-                var group = new MessageGroup(groupFirst.Author, groupFirst.Timestamp, groupBuffer.ToArray());
-                result.Add(group);
-            }
-
-            return result;
-        }
-    }
-}

DiscordChatExporter.Core/Services/SettingsService.cs

@@ -12,6 +12,7 @@ namespace DiscordChatExporter.Core.Services
 
         public AuthToken LastToken { get; set; }
         public ExportFormat LastExportFormat { get; set; } = ExportFormat.HtmlDark;
+        public int? LastPartitionLimit { get; set; }
 
         public SettingsService()
         {

DiscordChatExporter.Gui/App.xaml

@@ -4,6 +4,7 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:converters="clr-namespace:DiscordChatExporter.Gui.Converters"
     xmlns:local="clr-namespace:DiscordChatExporter.Gui"
+    DispatcherUnhandledException="App_OnDispatcherUnhandledException"
     StartupUri="Views/MainWindow.xaml">
     <Application.Resources>
         <ResourceDictionary>

DiscordChatExporter.Gui/App.xaml.cs

@@ -1,6 +1,13 @@
-namespace DiscordChatExporter.Gui
+using System.Windows;
+using System.Windows.Threading;
+
+namespace DiscordChatExporter.Gui
 {
     public partial class App
     {
+        private void App_OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs args)
+        {
+            MessageBox.Show(args.Exception.ToString(), "Error occured", MessageBoxButton.OK, MessageBoxImage.Error);
+        }
     }
 }

DiscordChatExporter.Gui/Container.cs

@@ -19,7 +19,6 @@ namespace DiscordChatExporter.Gui
             // Services
             SimpleIoc.Default.Register<IDataService, DataService>();
             SimpleIoc.Default.Register<IExportService, ExportService>();
-            SimpleIoc.Default.Register<IMessageGroupService, MessageGroupService>();
             SimpleIoc.Default.Register<ISettingsService, SettingsService>();
             SimpleIoc.Default.Register<IUpdateService, UpdateService>();
 

DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj

@@ -42,39 +42,12 @@
     <StartupObject />
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="CommonServiceLocator, Version=2.0.3.0, Culture=neutral, PublicKeyToken=489b6accfaf20ef0, processorArchitecture=MSIL">
-      <HintPath>..\packages\CommonServiceLocator.2.0.3\lib\net45\CommonServiceLocator.dll</HintPath>
-    </Reference>
-    <Reference Include="GalaSoft.MvvmLight, Version=5.4.1.0, Culture=neutral, PublicKeyToken=e7570ab207bcb616, processorArchitecture=MSIL">
-      <HintPath>..\packages\MvvmLightLibs.5.4.1\lib\net45\GalaSoft.MvvmLight.dll</HintPath>
-    </Reference>
-    <Reference Include="GalaSoft.MvvmLight.Extras, Version=5.4.1.0, Culture=neutral, PublicKeyToken=669f0b5e8f868abf, processorArchitecture=MSIL">
-      <HintPath>..\packages\MvvmLightLibs.5.4.1\lib\net45\GalaSoft.MvvmLight.Extras.dll</HintPath>
-    </Reference>
-    <Reference Include="GalaSoft.MvvmLight.Platform, Version=5.4.1.0, Culture=neutral, PublicKeyToken=5f873c45e98af8a1, processorArchitecture=MSIL">
-      <HintPath>..\packages\MvvmLightLibs.5.4.1\lib\net45\GalaSoft.MvvmLight.Platform.dll</HintPath>
-    </Reference>
-    <Reference Include="MaterialDesignColors, Version=1.1.3.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\MaterialDesignColors.1.1.3\lib\net45\MaterialDesignColors.dll</HintPath>
-    </Reference>
-    <Reference Include="MaterialDesignThemes.Wpf, Version=2.4.0.1044, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\MaterialDesignThemes.2.4.0.1044\lib\net45\MaterialDesignThemes.Wpf.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
-    <Reference Include="System.Windows.Interactivity, Version=4.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\packages\MvvmLightLibs.5.4.1\lib\net45\System.Windows.Interactivity.dll</HintPath>
-    </Reference>
     <Reference Include="System.Xaml">
       <RequiredTargetFramework>4.0</RequiredTargetFramework>
     </Reference>
-    <Reference Include="Tyrrrz.Extensions, Version=1.5.1.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Tyrrrz.Extensions.1.5.1\lib\net45\Tyrrrz.Extensions.dll</HintPath>
-    </Reference>
     <Reference Include="Tyrrrz.Settings, Version=1.3.2.0, Culture=neutral, PublicKeyToken=null" />
-    <Reference Include="Tyrrrz.WpfExtensions, Version=1.0.6269.37170, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Tyrrrz.WpfExtensions.1.0.5\lib\net45\Tyrrrz.WpfExtensions.dll</HintPath>
-    </Reference>
     <Reference Include="WindowsBase" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
@@ -119,9 +92,6 @@
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
     <None Include="app.config" />
-    <None Include="packages.config">
-      <SubType>Designer</SubType>
-    </None>
   </ItemGroup>
   <ItemGroup>
     <Resource Include="..\favicon.ico" />
@@ -150,6 +120,25 @@
       <Generator>MSBuild:Compile</Generator>
     </Page>
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <PackageReference Include="CommonServiceLocator">
+      <Version>2.0.3</Version>
+    </PackageReference>
+    <PackageReference Include="MaterialDesignColors">
+      <Version>1.1.3</Version>
+    </PackageReference>
+    <PackageReference Include="MaterialDesignThemes">
+      <Version>2.4.0.1044</Version>
+    </PackageReference>
+    <PackageReference Include="MvvmLightLibs">
+      <Version>5.4.1</Version>
+    </PackageReference>
+    <PackageReference Include="Tyrrrz.Extensions">
+      <Version>1.5.1</Version>
+    </PackageReference>
+    <PackageReference Include="Tyrrrz.WpfExtensions">
+      <Version>1.0.5</Version>
+    </PackageReference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>

DiscordChatExporter.Gui/Messages/StartExportMessage.cs

@@ -15,14 +15,17 @@ namespace DiscordChatExporter.Gui.Messages
 
         public DateTime? To { get; }
 
+        public int? PartitionLimit { get; }
+
         public StartExportMessage(Channel channel, string filePath, ExportFormat format,
-            DateTime? from, DateTime? to)
+            DateTime? from, DateTime? to, int? partitionLimit)
         {
             Channel = channel;
             FilePath = filePath;
             Format = format;
             From = from;
             To = to;
+            PartitionLimit = partitionLimit;
         }
     }
 }

DiscordChatExporter.Gui/Properties/AssemblyInfo.cs

@@ -3,5 +3,5 @@
 [assembly: AssemblyTitle("DiscordChatExporter")]
 [assembly: AssemblyCompany("Tyrrrz")]
 [assembly: AssemblyCopyright("Copyright (c) 2017-2018 Alexey Golub")]
-[assembly: AssemblyVersion("2.7")]
-[assembly: AssemblyFileVersion("2.7")]
+[assembly: AssemblyVersion("2.8")]
+[assembly: AssemblyFileVersion("2.8")]

DiscordChatExporter.Gui/ViewModels/ExportSetupViewModel.cs

@@ -19,6 +19,7 @@ namespace DiscordChatExporter.Gui.ViewModels
         private ExportFormat _format;
         private DateTime? _from;
         private DateTime? _to;
+        private int? _partitionLimit;
 
         public Guild Guild { get; private set; }
 
@@ -63,6 +64,12 @@ namespace DiscordChatExporter.Gui.ViewModels
             set => Set(ref _to, value);
         }
 
+        public int? PartitionLimit
+        {
+            get => _partitionLimit;
+            set => Set(ref _partitionLimit, value);
+        }
+
         // Commands
         public RelayCommand ExportCommand { get; }
 
@@ -83,13 +90,15 @@ namespace DiscordChatExporter.Gui.ViewModels
                     .Replace(Path.GetInvalidFileNameChars(), '_');
                 From = null;
                 To = null;
+                PartitionLimit = _settingsService.LastPartitionLimit;
             });
         }
 
         private void Export()
         {
-            // Save format
+            // Persist preferences
             _settingsService.LastExportFormat = SelectedFormat;
+            _settingsService.LastPartitionLimit = PartitionLimit;
 
             // Clamp 'from' and 'to' values
             if (From > To)
@@ -98,7 +107,7 @@ namespace DiscordChatExporter.Gui.ViewModels
                 To = From;
 
             // Start export
-            MessengerInstance.Send(new StartExportMessage(Channel, FilePath, SelectedFormat, From, To));
+            MessengerInstance.Send(new StartExportMessage(Channel, FilePath, SelectedFormat, From, To, PartitionLimit));
         }
     }
 }

DiscordChatExporter.Gui/ViewModels/IExportSetupViewModel.cs

@@ -14,6 +14,7 @@ namespace DiscordChatExporter.Gui.ViewModels
         ExportFormat SelectedFormat { get; set; }
         DateTime? From { get; set; }
         DateTime? To { get; set; }
+        int? PartitionLimit { get; set; }
 
         RelayCommand ExportCommand { get; }
     }

DiscordChatExporter.Gui/ViewModels/MainViewModel.cs

@@ -19,7 +19,6 @@ namespace DiscordChatExporter.Gui.ViewModels
         private readonly ISettingsService _settingsService;
         private readonly IUpdateService _updateService;
         private readonly IDataService _dataService;
-        private readonly IMessageGroupService _messageGroupService;
         private readonly IExportService _exportService;
 
         private readonly Dictionary<Guild, IReadOnlyList<Channel>> _guildChannelsMap;
@@ -111,12 +110,11 @@ namespace DiscordChatExporter.Gui.ViewModels
         public RelayCommand<Channel> ShowExportSetupCommand { get; }
 
         public MainViewModel(ISettingsService settingsService, IUpdateService updateService, IDataService dataService,
-            IMessageGroupService messageGroupService, IExportService exportService)
+            IExportService exportService)
         {
             _settingsService = settingsService;
             _updateService = updateService;
             _dataService = dataService;
-            _messageGroupService = messageGroupService;
             _exportService = exportService;
 
             _guildChannelsMap = new Dictionary<Guild, IReadOnlyList<Channel>>();
@@ -131,7 +129,7 @@ namespace DiscordChatExporter.Gui.ViewModels
 
             // Messages
             MessengerInstance.Register<StartExportMessage>(this,
-                m => Export(m.Channel, m.FilePath, m.Format, m.From, m.To));
+                m => Export(m.Channel, m.FilePath, m.Format, m.From, m.To, m.PartitionLimit));
         }
 
         private async void ViewLoaded()
@@ -241,7 +239,8 @@ namespace DiscordChatExporter.Gui.ViewModels
             MessengerInstance.Send(new ShowExportSetupMessage(SelectedGuild, channel));
         }
 
-        private async void Export(Channel channel, string filePath, ExportFormat format, DateTime? from, DateTime? to)
+        private async void Export(Channel channel, string filePath, ExportFormat format, 
+            DateTime? from, DateTime? to, int? partitionLimit)
         {
             IsBusy = true;
 
@@ -256,24 +255,11 @@ namespace DiscordChatExporter.Gui.ViewModels
 
             try
             {
-                // TODO: extract this to make it reusable across implementations
-                // Get messages
-                var messages = await _dataService.GetChannelMessagesAsync(token, channel.Id, from, to, progressHandler);
-
-                // Group messages
-                var messageGroups = _messageGroupService.GroupMessages(messages);
-
-                // Get mentionables
-                var mentionables = await _dataService.GetMentionablesAsync(token, guild.Id, messages);
-
-                // Create log
-                var log = new ChatLog(guild, channel, from, to, messageGroups, mentionables);
+                // Get chat log
+                var chatLog = await _dataService.GetChatLogAsync(token, guild, channel, from, to, progressHandler);
 
                 // Export
-                _exportService.Export(format, filePath, log);
-
-                // Open
-                Process.Start(filePath);
+                _exportService.ExportChatLog(chatLog, filePath, format, partitionLimit);
 
                 // Notify completion
                 MessengerInstance.Send(new ShowNotificationMessage("Export complete"));

DiscordChatExporter.Gui/Views/ExportSetupDialog.xaml

@@ -55,6 +55,13 @@
                 SelectedDate="{Binding To}" />
         </Grid>
 
+        <!--  Partitioning  -->
+        <TextBox
+            Margin="16,8,16,8"
+            materialDesign:HintAssist.Hint="Messages per partition (optional)"
+            materialDesign:HintAssist.IsFloating="True"
+            Text="{Binding PartitionLimit, TargetNullValue=''}" />
+
         <!--  Buttons  -->
         <StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
             <Button

DiscordChatExporter.Gui/packages.config

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="CommonServiceLocator" version="2.0.3" targetFramework="net461" />
-  <package id="MaterialDesignColors" version="1.1.3" targetFramework="net461" />
-  <package id="MaterialDesignThemes" version="2.4.0.1044" targetFramework="net461" />
-  <package id="MvvmLightLibs" version="5.4.1" targetFramework="net461" />
-  <package id="Tyrrrz.Extensions" version="1.5.1" targetFramework="net461" />
-  <package id="Tyrrrz.WpfExtensions" version="1.0.5" targetFramework="net461" />
-</packages>