Add super basic group model/command

PluralKit.Bot/Commands/CommandTree.cs

@@ -45,6 +45,8 @@ namespace PluralKit.Bot
         public static Command MemberKeepProxy = new Command("member keepproxy", "member <member> keepproxy [on|off]", "Sets whether to include a member's proxy tags when proxying");
         public static Command MemberRandom = new Command("random", "random", "Looks up a random member from your system");
         public static Command MemberPrivacy = new Command("member privacy", "member <member> privacy <name|description|birthday|pronouns|metadata|visibility|all> <public|private>", "Changes a members's privacy settings");
+        public static Command GroupInfo = new Command("group", "group <name>", "Looks up information about a group");
+        public static Command GroupNew = new Command("group new", "group new <name>", "Creates a new group");
         public static Command Switch = new Command("switch", "switch <member> [member 2] [member 3...]", "Registers a switch");
         public static Command SwitchOut = new Command("switch out", "switch out", "Registers a switch with no members");
         public static Command SwitchMove = new Command("switch move", "switch move <date/time>", "Moves the latest switch in time");
@@ -97,6 +99,8 @@ namespace PluralKit.Bot
                 return HandleSystemCommand(ctx);
             if (ctx.Match("member", "m"))
                 return HandleMemberCommand(ctx);
+            if (ctx.Match("group", "g"))
+                return HandleGroupCommand(ctx);
             if (ctx.Match("switch", "sw"))
                 return HandleSwitchCommand(ctx);
             if (ctx.Match("ap", "autoproxy", "auto"))
@@ -312,6 +316,19 @@ namespace PluralKit.Bot
                 await PrintCommandNotFoundError(ctx, MemberInfo, MemberRename, MemberDisplayName, MemberServerName ,MemberDesc, MemberPronouns, MemberColor, MemberBirthday, MemberProxy, MemberDelete, MemberAvatar, SystemList);
         }
 
+        private async Task HandleGroupCommand(Context ctx)
+        {
+            // Commands with no group argument
+            if (ctx.Match("n", "new"))
+                await ctx.Execute<Groups>(GroupNew, g => g.CreateGroup(ctx));
+
+            if (await ctx.MatchGroup() is {} group)
+            {
+                // Commands with group argument
+                await ctx.Execute<Groups>(GroupInfo, g => g.ShowGroupCard(ctx, group));
+            }
+        }
+
         private async Task HandleSwitchCommand(Context ctx)
         {
             if (ctx.Match("out"))

PluralKit.Bot/Commands/Groups.cs

@@ -0,0 +1,58 @@
+using System.Threading.Tasks;
+
+using DSharpPlus.Entities;
+
+using PluralKit.Core;
+
+namespace PluralKit.Bot
+{
+    public class Groups
+    {
+        private readonly IDatabase _db;
+
+        public Groups(IDatabase db)
+        {
+            _db = db;
+        }
+
+        public async Task CreateGroup(Context ctx)
+        {
+            ctx.CheckSystem();
+            
+            var groupName = ctx.RemainderOrNull() ?? throw new PKSyntaxError("You must pass a group name.");
+            if (groupName.Length > Limits.MaxGroupNameLength)
+                throw new PKError($"Group name too long ({groupName.Length}/{Limits.MaxMemberNameLength} characters).");
+            
+            await using var conn = await _db.Obtain();
+            var newGroup = await conn.CreateGroup(ctx.System.Id, groupName);
+
+            await ctx.Reply($"{Emojis.Success} Group \"**{groupName}**\" (`{newGroup.Hid}`) registered!\nYou can now start adding members to the group:\n- **pk;group {newGroup.Hid} add <members...>**");
+        }
+
+        public async Task ShowGroupCard(Context ctx, PKGroup target)
+        {
+            await using var conn = await _db.Obtain();
+            
+            var system = await GetGroupSystem(ctx, target, conn);
+
+            var nameField = target.Name;
+            if (system.Name != null)
+                nameField = $"{nameField} ({system.Name})";
+
+            var eb = new DiscordEmbedBuilder()
+                .WithAuthor(nameField)
+                .WithDescription(target.Description)
+                .WithFooter($"System ID: {system.Hid} | Group ID: {target.Hid} | Created on {target.Created.FormatZoned(system)}");
+
+            await ctx.Reply(embed: eb.Build());
+        }
+
+        private static async Task<PKSystem> GetGroupSystem(Context ctx, PKGroup target, IPKConnection conn)
+        {
+            var system = ctx.System;
+            if (system?.Id == target.System)
+                return system;
+            return await conn.QuerySystem(target.System)!;
+        }
+    }
+}