Command name autocomplete

src/AutocompleteProviders/CommandAutocompleteProvider.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using DSharpPlus.Commands.Processors.SlashCommands;
+using DSharpPlus.Commands.Processors.SlashCommands.ArgumentModifiers;
+using DSharpPlus.Commands.Trees;
+using DSharpPlus.Entities;
+using Humanizer;
+
+namespace OoLunar.Tomoe.AutocompleteProviders
+{
+    public sealed class CommandAutocompleteProvider : IAutoCompleteProvider
+    {
+        public ValueTask<IEnumerable<DiscordAutoCompleteChoice>> AutoCompleteAsync(AutoCompleteContext context)
+        {
+            if (string.IsNullOrWhiteSpace(context.UserInput))
+            {
+                return ValueTask.FromResult<IEnumerable<DiscordAutoCompleteChoice>>(context.Extension.Commands.Values
+                    .Take(25)
+                    .Select(command => new DiscordAutoCompleteChoice(command.FullName.Humanize(LetterCasing.Title), command.FullName))
+                    .OrderBy(command => command.Name));
+            }
+
+            List<DiscordAutoCompleteChoice> choices = [];
+            foreach (Command command in context.Extension.Commands.Values.SelectMany(command => command.Flatten()))
+            {
+                if (command.FullName.Contains(context.UserInput, StringComparison.OrdinalIgnoreCase))
+                {
+                    choices.Add(new DiscordAutoCompleteChoice(command.FullName.Humanize(LetterCasing.Title), command.FullName));
+                }
+            }
+
+            return ValueTask.FromResult<IEnumerable<DiscordAutoCompleteChoice>>(choices
+                .OrderBy(x => x.Name.StartsWith(context.UserInput, StringComparison.OrdinalIgnoreCase) ? 0 : 1)
+                .ThenBy(x => x.Name));
+        }
+    }
+}

src/Commands/Common/SourceCodeCommand.cs

@@ -8,13 +8,15 @@
 using System.Threading.Tasks;
 using DSharpPlus.Commands;
 using DSharpPlus.Commands.ArgumentModifiers;
+using DSharpPlus.Commands.Processors.SlashCommands.ArgumentModifiers;
 using DSharpPlus.Commands.Processors.TextCommands;
 using DSharpPlus.Commands.Trees;
 using DSharpPlus.Commands.Trees.Metadata;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Text;
+using OoLunar.Tomoe.AutocompleteProviders;
 
 namespace OoLunar.Tomoe.Commands.Common
 {
@@ -222,7 +224,7 @@ private static IEnumerable<T> GetNodes<T>(this IEnumerable<SyntaxNode> nodes) wh
         /// Sends a link to the repository which contains the code for the bot.
         /// </summary>
         [Command("source_code"), TextAlias("repository", "source", "code", "repo")]
-        public static async ValueTask ExecuteAsync(CommandContext context, [RemainingText] string? commandName = null)
+        public static async ValueTask ExecuteAsync(CommandContext context, [RemainingText, SlashAutoCompleteProvider<CommandAutocompleteProvider>] string? commandName = null)
         {
             if (string.IsNullOrWhiteSpace(commandName))
             {