added: Added .afk <msg>? command which sets an afk message which will trigger whenever someone pings a user.

src/NadekoBot/Modules/Expressions/NadekoExpressions.cs

@@ -402,11 +402,10 @@ public partial class NadekoExpressions : NadekoModule<NadekoExpressionsService>
     }
 
     [Cmd]
-#if GLOBAL_NADEKO
-    [OwnerOnly]
-#endif
     public async Task ExprsImport([Leftover] string input = null)
     {
+        // todo cooldown on public bot for 1 day, limit 100
+        
         if (!AdminInGuildOrOwnerInDm())
         {
             await Response().Error(strs.expr_insuff_perms).SendAsync();

src/NadekoBot/Modules/Utility/AfkService.cs

@@ -0,0 +1,148 @@
+using NadekoBot.Common.ModuleBehaviors;
+
+namespace NadekoBot.Modules.Utility;
+
+public sealed class AfkService : INService, IReadyExecutor
+{
+    private readonly IBotCache _cache;
+    private readonly DiscordSocketClient _client;
+    private readonly MessageSenderService _mss;
+
+    private static readonly TimeSpan _maxAfkDuration = 8.Hours();
+    public AfkService(IBotCache cache, DiscordSocketClient client, MessageSenderService mss)
+    {
+        _cache = cache;
+        _client = client;
+        _mss = mss;
+    }
+
+    private static TypedKey<string> GetKey(ulong userId)
+        => new($"afk:msg:{userId}");
+
+    public async Task<bool> SetAfkAsync(ulong userId, string text)
+    {
+        var added = await _cache.AddAsync(GetKey(userId), text, _maxAfkDuration, overwrite: true);
+
+        async Task StopAfk(SocketMessage socketMessage)
+        {
+            try
+            {
+                if (socketMessage.Author?.Id == userId)
+                {
+                    await _cache.RemoveAsync(GetKey(userId));
+                    _client.MessageReceived -= StopAfk;
+
+                    // write the message saying afk status cleared
+
+                    if (socketMessage.Channel is ITextChannel tc)
+                    {
+                        _ = Task.Run(async () =>
+                        {
+                            var msg = await _mss.Response(tc).Confirm("AFK message cleared!").SendAsync();
+
+                            msg.DeleteAfter(5);
+                        });
+                    }
+
+                }
+
+            }
+            catch (Exception ex)
+            {
+                Log.Warning("Unexpected error occurred while trying to stop afk: {Message}", ex.Message);
+            }
+        }
+
+        _client.MessageReceived += StopAfk;
+
+
+        _ = Task.Run(async () =>
+        {
+            await Task.Delay(_maxAfkDuration);
+            _client.MessageReceived -= StopAfk;
+        });
+        
+        return added;
+    }
+
+    public Task OnReadyAsync()
+    {
+        _client.MessageReceived += TryTriggerAfkMessage;
+
+        return Task.CompletedTask;
+    }
+
+    private Task TryTriggerAfkMessage(SocketMessage arg)
+    {
+        if (arg.Author.IsBot)
+            return Task.CompletedTask;
+
+        if (arg is not IUserMessage uMsg || uMsg.Channel is not ITextChannel tc)
+            return Task.CompletedTask;
+        
+        if ((arg.MentionedUsers.Count is 0 or > 3) && uMsg.ReferencedMessage is null)
+            return Task.CompletedTask;
+
+        _ = Task.Run(async () =>
+        {
+            var botUser = await tc.Guild.GetCurrentUserAsync();
+
+            var perms = botUser.GetPermissions(tc);
+
+            if (!perms.SendMessages)
+                return;
+
+            ulong mentionedUserId = 0;
+
+            if (arg.MentionedUsers.Count <= 3)
+            {
+                foreach (var uid in uMsg.MentionedUserIds)
+                {
+                    if (uid == arg.Author.Id)
+                        continue;
+
+                    if (arg.Content.StartsWith($"<@{uid}>") || arg.Content.StartsWith($"<@!{uid}>"))
+                    {
+                        mentionedUserId = uid;
+                        break;
+                    }
+                }
+            }
+
+            if (mentionedUserId == 0)
+            {
+                if (uMsg.ReferencedMessage?.Author?.Id is not ulong repliedUserId)
+                {
+                    return;
+                }
+                
+                mentionedUserId = repliedUserId;
+            }
+
+            try
+            {
+                var result = await _cache.GetAsync(GetKey(mentionedUserId));
+                if (result.TryPickT0(out var msg, out _))
+                {
+                    var st = SmartText.CreateFrom(msg);
+                    
+                    st = "The user is AFK: " + st;
+                    
+                    var toDelete = await _mss.Response(arg.Channel)
+                                             .Message(uMsg)
+                                             .Text(st)
+                                             .Sanitize(false)
+                                             .SendAsync();
+
+                    toDelete.DeleteAfter(30);
+                }
+            }
+            catch (HttpException ex)
+            {
+                Log.Warning("Error in afk service: {Message}", ex.Message);
+            }
+        });
+
+        return Task.CompletedTask;
+    }
+}

src/NadekoBot/Modules/Utility/Utility.cs

@@ -1,4 +1,4 @@
-#nullable disable
+using LinqToDB.Reflection;
 using NadekoBot.Modules.Utility.Services;
 using Newtonsoft.Json;
 using System.Diagnostics;
@@ -7,6 +7,7 @@ using System.Text.Json;
 using System.Text.Json.Serialization;
 using Microsoft.CodeAnalysis.CSharp.Scripting;
 using Microsoft.CodeAnalysis.Scripting;
+using NadekoBot.Modules.Games.Hangman;
 using NadekoBot.Modules.Searches.Common;
 
 namespace NadekoBot.Modules.Utility;
@@ -41,6 +42,7 @@ public partial class Utility : NadekoModule
     private readonly IHttpClientFactory _httpFactory;
     private readonly VerboseErrorsService _veService;
     private readonly IServiceProvider _services;
+    private readonly AfkService _afkService;
 
     public Utility(
         DiscordSocketClient client,
@@ -50,7 +52,8 @@ public partial class Utility : NadekoModule
         DownloadTracker tracker,
         IHttpClientFactory httpFactory,
         VerboseErrorsService veService,
-        IServiceProvider services)
+        IServiceProvider services,
+        AfkService afkService)
     {
         _client = client;
         _coord = coord;
@@ -60,6 +63,7 @@ public partial class Utility : NadekoModule
         _httpFactory = httpFactory;
         _veService = veService;
         _services = services;
+        _afkService = afkService;
     }
 
     [Cmd]
@@ -99,7 +103,7 @@ public partial class Utility : NadekoModule
 
     [Cmd]
     [RequireContext(ContextType.Guild)]
-    public async Task WhosPlaying([Leftover] string game)
+    public async Task WhosPlaying([Leftover] string? game)
     {
         game = game?.Trim().ToUpperInvariant();
         if (string.IsNullOrWhiteSpace(game))
@@ -140,7 +144,7 @@ public partial class Utility : NadekoModule
     [Cmd]
     [RequireContext(ContextType.Guild)]
     [Priority(0)]
-    public async Task InRole(int page, [Leftover] IRole role = null)
+    public async Task InRole(int page, [Leftover] IRole? role = null)
     {
         if (--page < 0)
             return;
@@ -178,7 +182,7 @@ public partial class Utility : NadekoModule
     [Cmd]
     [RequireContext(ContextType.Guild)]
     [Priority(1)]
-    public Task InRole([Leftover] IRole role = null)
+    public Task InRole([Leftover] IRole? role = null)
         => InRole(1, role);
 
     [Cmd]
@@ -218,7 +222,7 @@ public partial class Utility : NadekoModule
 
     [Cmd]
     [RequireContext(ContextType.Guild)]
-    public async Task UserId([Leftover] IGuildUser target = null)
+    public async Task UserId([Leftover] IGuildUser? target = null)
     {
         var usr = target ?? ctx.User;
         await Response()
@@ -248,7 +252,7 @@ public partial class Utility : NadekoModule
 
     [Cmd]
     [RequireContext(ContextType.Guild)]
-    public async Task Roles(IGuildUser target, int page = 1)
+    public async Task Roles(IGuildUser? target, int page = 1)
     {
         var guild = ctx.Guild;
 
@@ -301,7 +305,7 @@ public partial class Utility : NadekoModule
 
     [Cmd]
     [RequireContext(ContextType.Guild)]
-    public async Task ChannelTopic([Leftover] ITextChannel channel = null)
+    public async Task ChannelTopic([Leftover] ITextChannel? channel = null)
     {
         if (channel is null)
             channel = (ITextChannel)ctx.Channel;
@@ -382,7 +386,7 @@ public partial class Utility : NadekoModule
     [BotPerm(GuildPerm.ManageEmojisAndStickers)]
     [UserPerm(GuildPerm.ManageEmojisAndStickers)]
     [Priority(0)]
-    public async Task EmojiAdd(string name, string url = null)
+    public async Task EmojiAdd(string name, string? url = null)
     {
         name = name.Trim(':');
 
@@ -456,10 +460,10 @@ public partial class Utility : NadekoModule
     [RequireContext(ContextType.Guild)]
     [BotPerm(GuildPerm.ManageEmojisAndStickers)]
     [UserPerm(GuildPerm.ManageEmojisAndStickers)]
-    public async Task StickerAdd(string name = null, string description = null, params string[] tags)
+    public async Task StickerAdd(string? name = null, string? description = null, params string[] tags)
     {
         string format;
-        Stream stream = null;
+        Stream? stream = null;
 
         try
         {
@@ -696,6 +700,19 @@ public partial class Utility : NadekoModule
             await Response().Confirm(strs.verbose_errors_disabled).SendAsync();
     }
 
+    [Cmd]
+    public async Task Afk([Leftover] string text = "No reason specified.")
+    {
+        var succ = await _afkService.SetAfkAsync(ctx.User.Id, text);
+
+        if (succ)
+        {
+            await Response()
+                  .Confirm(strs.afk_set)
+                  .SendAsync();
+        }
+    }
+
     [Cmd]
     [NoPublicBot]
     [OwnerOnly]

src/NadekoBot/data/aliases.yml

@@ -1410,4 +1410,6 @@ honeypot:
 coins:
   - coins
   - crypto
-  - cryptos
+  - cryptos
+afk:
+  - afk

src/NadekoBot/data/strings/commands/commands.en-US.yml

@@ -4577,4 +4577,15 @@ coins:
     - '2'
   params:
     - page:
-        desc: "Page number to show. Starts at 1."
+        desc: "Page number to show. Starts at 1."
+afk:
+  desc: |-
+    Toggles AFK status for yourself with the specified message. 
+    If you don't provide a message it default to a generic one.
+    Anyone @ mentioning you in any server will receive the afk message.
+    This will only work if the other user's message starts with the mention.
+  ex:
+    - ''
+  params:
+    - msg:
+        desc: "The message to send when someone pings you."

src/NadekoBot/data/strings/responses/responses.en-US.json

@@ -1104,5 +1104,6 @@
   "queue_search_results": "Type the number of the search result to queue up that track.",
   "overloads": "Overloads",
   "honeypot_on": "Honeypot enabled on this channel." ,
-  "honeypot_off": "Honeypot disabled."
+  "honeypot_off": "Honeypot disabled.",
+  "afk_set": "AFK message set. Type a message in any channel to clear."
 }