Add super basic group model/command

PluralKit.Bot/CommandSystem/Context.cs

@@ -25,6 +25,7 @@ namespace PluralKit.Bot
         private readonly MessageContext _messageContext;
 
         private readonly IDataStore _data;
+        private readonly IDatabase _db;
         private readonly PKSystem _senderSystem;
         private readonly IMetrics _metrics;
 
@@ -40,6 +41,7 @@ namespace PluralKit.Bot
             _data = provider.Resolve<IDataStore>();
             _senderSystem = senderSystem;
             _messageContext = messageContext;
+            _db = provider.Resolve<IDatabase>();
             _metrics = provider.Resolve<IMetrics>();
             _provider = provider;
             _parameters = new Parameters(message.Content.Substring(commandParseOffset));
@@ -61,6 +63,7 @@ namespace PluralKit.Bot
 
         // TODO: this is just here so the extension methods can access it; should it be public/private/?
         internal IDataStore DataStore => _data;
+        internal IDatabase Database => _db;
 
         public Task<DiscordMessage> Reply(string text = null, DiscordEmbed embed = null, IEnumerable<IMention> mentions = null)
         {

PluralKit.Bot/CommandSystem/ContextEntityArgumentsExt.cs

@@ -97,6 +97,26 @@ namespace PluralKit.Bot
             // Finally, we return the member value.
             return member;
         }
+        
+        public static async Task<PKGroup> PeekGroup(this Context ctx)
+        {
+            var input = ctx.PeekArgument();
+
+            await using var conn = await ctx.Database.Obtain();
+            if (await conn.QueryGroupByName(input) is {} byName)
+                return byName;
+            if (await conn.QueryGroupByHid(input) is {} byHid)
+                return byHid;
+
+            return null;
+        }
+
+        public static async Task<PKGroup> MatchGroup(this Context ctx)
+        {
+            var group = await ctx.PeekGroup();
+            if (group != null) ctx.PopArgument();
+            return group;
+        }
 
         public static string CreateMemberNotFoundError(this Context ctx, string input)
         {