bot: add birthday command

PluralKit.Bot/Bot.cs

@@ -10,6 +10,7 @@ using Discord.Commands;
 using Discord.WebSocket;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using NodaTime;
 using Npgsql;
 
 namespace PluralKit.Bot
@@ -34,6 +35,14 @@ namespace PluralKit.Bot
             SqlMapper.AddTypeHandler<ulong>(new UlongEncodeAsLongHandler());
             Dapper.DefaultTypeMap.MatchNamesWithUnderscores = true;
 
+            // Also, use NodaTime. it's good.
+            NpgsqlConnection.GlobalTypeMapper.UseNodaTime();
+            // With the thing we add above, Npgsql already handles NodaTime integration
+            // This makes Dapper confused since it thinks it has to convert it anyway and doesn't understand the types
+            // So we add a custom type handler that literally just passes the type through to Npgsql
+            SqlMapper.AddTypeHandler(new PassthroughTypeHandler<Instant>());
+            SqlMapper.AddTypeHandler(new PassthroughTypeHandler<LocalDate>());
+            
             using (var services = BuildServiceProvider())
             {
                 Console.WriteLine("- Connecting to database...");

PluralKit.Bot/Commands/MemberCommands.cs

@@ -2,6 +2,7 @@ using System;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Discord.Commands;
+using NodaTime;
 
 namespace PluralKit.Bot.Commands
 {
@@ -118,11 +119,31 @@ namespace PluralKit.Bot.Commands
             await Context.Channel.SendMessageAsync($"{Emojis.Success} Member color {(color == null ? "cleared" : "changed")}.");
         }
 
+        [Command("birthday")]
+        [Alias("birthdate", "bday", "cakeday", "bdate")]
+        [Remarks("member <member> birthday <birthday>")]
+        [MustPassOwnMember]
+        public async Task MemberBirthday([Remainder] string birthday = null)
+        {
+            LocalDate? date = null;
+            if (birthday != null)
+            {
+                date = PluralKit.Utils.ParseDate(birthday, true);
+                if (date == null) throw Errors.BirthdayParseError(birthday);
+            }
+
+            ContextEntity.Birthday = date;
+            await Members.Save(ContextEntity);
+            
+            await Context.Channel.SendMessageAsync($"{Emojis.Success} Member birthdate {(date == null ? "cleared" : $"changed to {ContextEntity.BirthdayString}")}.");
+        }
+
         [Command]
+        [Alias("view", "show", "info")]
         [Remarks("member")]
         public async Task ViewMember(PKMember member)
         {
-            var system = await Systems.GetById(member.Id);
+            var system = await Systems.GetById(member.System);
             await Context.Channel.SendMessageAsync(embed: await Embeds.CreateMemberEmbed(system, member));
         }
         

PluralKit.Bot/Errors.cs

@@ -14,6 +14,7 @@ namespace PluralKit.Bot {
         public static PKError MemberNameTooLongError(int length) => new PKError($"Member name too long ({length}/{Limits.MaxMemberNameLength} characters).");
         public static PKError MemberPronounsTooLongError(int length) => new PKError($"Member pronouns too long ({length}/{Limits.MaxMemberNameLength} characters).");
         
-        public static PKError InvalidColorError(string color) => new PKError($"{color} is not a valid color. Color must be in hex format (eg. #ff0000).");
+        public static PKError InvalidColorError(string color) => new PKError($"\"{color}\" is not a valid color. Color must be in hex format (eg. #ff0000).");
+        public static PKError BirthdayParseError(string birthday) => new PKError($"\"{birthday}\" could not be parsed as a valid date. Try a format like \"2016-12-24\" or \"May 3 1996\".");
     }
 }

PluralKit.Bot/Utils.cs

@@ -9,6 +9,7 @@ using Discord.Commands;
 using Discord.Commands.Builders;
 using Discord.WebSocket;
 using Microsoft.Extensions.DependencyInjection;
+using NodaTime;
 
 namespace PluralKit.Bot
 {
@@ -32,6 +33,19 @@ namespace PluralKit.Bot
         }
     }
 
+    class PassthroughTypeHandler<T> : SqlMapper.TypeHandler<T>
+    {
+        public override void SetValue(IDbDataParameter parameter, T value)
+        {
+            parameter.Value = value;
+        }
+
+        public override T Parse(object value)
+        {
+            return (T) value;
+        }
+    }
+
     class PKSystemTypeReader : TypeReader
     {
         public override async Task<TypeReaderResult> ReadAsync(ICommandContext context, string input, IServiceProvider services)