Added .deleteemptyservers command

src/NadekoBot/Modules/Administration/Self/SelfCommands.cs

@@ -295,6 +295,36 @@ public partial class Administration
         public partial Task Leave([Leftover] string guildStr)
             => _service.LeaveGuild(guildStr);
 
+        [Cmd]
+        [OwnerOnly]
+        public async partial Task DeleteEmptyServers()
+        {
+            await ctx.Channel.TriggerTypingAsync();
+
+            var toLeave = _client.Guilds
+                                 .Where(s => s.MemberCount == 1 && s.Users.Count == 1)
+                                 .ToList();
+            
+            foreach (var server in toLeave)
+            {
+                try
+                {
+                    await server.DeleteAsync();
+                    Log.Information("Deleted server {ServerName} [{ServerId}]",
+                        server.Name,
+                        server.Id);
+                }
+                catch (Exception ex)
+                {
+                    Log.Warning(ex,
+                        "Error leaving server {ServerName} [{ServerId}]",
+                        server.Name,
+                        server.Id);
+                }
+            }
+
+            await ReplyConfirmLocalizedAsync(strs.deleted_x_servers(toLeave.Count));
+        }
 
         [Cmd]
         [OwnerOnly]

src/NadekoBot/data/aliases.yml

@@ -1261,3 +1261,5 @@ exprsimport:
   - eximport
 exprsexport:
   - exexport
+deleteemptyservers:
+  - deleteemptyservers

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

@@ -2141,3 +2141,7 @@ showembed:
   args:
     - "820022733172121600"
     - "#some-channel 820022733172121600"
+deleteemptyservers:
+  desc: "Deletes all servers in which the bot is the only member."
+  args:
+    - ""

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

@@ -966,5 +966,6 @@
   "favorites": "Favorites",
   "tags": "Tags",
   "imageonly_enable": "This channel is now image-only.",
-  "imageonly_disable": "This channel is no longer image-only."
+  "imageonly_disable": "This channel is no longer image-only.",
+  "deleted_x_servers": "Deleted {0} servers."
 }