Squashed commit of the following:

commit dca41a348e36a9b4e7006ef3a76377eb32aad276
Author: quin lynch <[email protected]>
Date:   Thu Sep 23 07:02:19 2021 -0300

    Autocomplete commands

src/Discord.Net.Core/Discord.Net.Core.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <Import Project="../../Discord.Net.targets" />
   <Import Project="../../StyleAnalyzer.targets" />
   <PropertyGroup>

src/Discord.Net.Core/Entities/Interactions/ApplicationCommandOption.cs

@@ -16,7 +16,7 @@ public class ApplicationCommandOptionProperties
         private string _description;
 
         /// <summary>
-        ///     The name of this option.
+        ///     Gets or sets the name of this option.
         /// </summary>
         public string Name
         {
@@ -37,7 +37,7 @@ public string Name
         }
 
         /// <summary>
-        ///     The description of this option.
+        ///     Gets or sets the description of this option.
         /// </summary>
         public string Description
         {
@@ -53,27 +53,31 @@ public string Description
         }
 
         /// <summary>
-        ///     The type of this option.
+        ///     Gets or sets the type of this option.
         /// </summary>
         public ApplicationCommandOptionType Type { get; set; }
 
         /// <summary>
-        ///     The first required option for the user to complete. only one option can be default.
+        ///     Gets or sets whether or not this options is the first required option for the user to complete. only one option can be default.
         /// </summary>
         public bool? Default { get; set; }
 
         /// <summary>
-        ///     <see langword="true"/> if this option is required for this command, otherwise <see langword="false"/>.
+        ///     Gets or sets if the option is required.
         /// </summary>
         public bool? Required { get; set; }
 
         /// <summary>
-        ///     choices for string and int types for the user to pick from.
+        ///     Gets or sets whether or not this option supports autocomplete.
+        /// </summary>
+        public bool Autocomplete { get; set; }
+        /// <summary>
+        ///     Gets or sets the choices for string and int types for the user to pick from.
         /// </summary>
         public List<ApplicationCommandOptionChoiceProperties> Choices { get; set; }
 
         /// <summary>
-        ///     If the option is a subcommand or subcommand group type, this nested options will be the parameters.
+        ///     Gets or sets if this option is a subcommand or subcommand group type, these nested options will be the parameters.
         /// </summary>
         public List<ApplicationCommandOptionProperties> Options { get; set; }
 

src/Discord.Net.Core/Entities/Interactions/AutocompleteOption.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Discord
+{
+    /// <summary>
+    ///     Represents an autocomplete option.
+    /// </summary>
+    public class AutocompleteOption
+    {
+        /// <summary>
+        ///     Gets the type of this option
+        /// </summary>
+        public ApplicationCommandOptionType Type { get; }
+
+        /// <summary>
+        ///     Gets the name of the option.
+        /// </summary>
+        public string Name { get; }
+
+        /// <summary>
+        ///     Gets the value of the option.
+        /// </summary>
+        public object Value { get; }
+
+        /// <summary>
+        ///     Gets whether or not this option is focused by the executing user.
+        /// </summary>
+        public bool Focused { get; }
+
+        internal AutocompleteOption(ApplicationCommandOptionType type, string name, object value, bool focused)
+        {
+            this.Type = type;
+            this.Name = name;
+            this.Value = value;
+            this.Focused = focused;
+        }
+    }
+}

src/Discord.Net.Core/Entities/Interactions/AutocompleteResult.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Discord
+{
+    /// <summary>
+    ///     Represents a result to an autocomplete interaction.
+    /// </summary>
+    public class AutocompleteResult
+    {
+        private object _value { get; set; }
+        private string _name { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the name of the result.
+        /// </summary>
+        /// <remarks>
+        ///     Name cannot be null and has to be between 1-100 characters in length.
+        /// </remarks>
+        /// <exception cref="ArgumentNullException"/>
+        /// <exception cref="ArgumentException"/>
+        public string Name
+        {
+            get => _name;
+            set
+            {
+                if (value == null)
+                    throw new ArgumentException("Name cannot be null!");
+                if (value.Length > 100)
+                    throw new ArgumentException("Name length must be less than or equal to 100 characters in length!");
+                if (value.Length < 1)
+                    throw new ArgumentException("Name length must at least 1 character in length!");
+                _name = value;
+            }
+        }
+
+        /// <summary>
+        ///     Gets or sets the value of the result.
+        /// </summary>
+        /// <remarks>
+        ///     Only <see cref="string"/>, <see cref="int"/>, and <see cref="double"/> are allowed for a value.
+        /// </remarks>
+        /// <exception cref="ArgumentNullException"/>
+        /// <exception cref="ArgumentException"/>
+        public object Value
+        {
+            get => _value;
+            set
+            {
+                if (value == null)
+                    throw new ArgumentNullException("Value cannot be null");
+
+                switch (value)
+                {
+                    case string str:
+                        _value = str;
+                        break;
+                    case int integer:
+                        _value = integer;
+                        break;
+                    case double number:
+                        _value = number;
+                        break;
+
+                    default:
+                        throw new ArgumentException($"Type {value.GetType().Name} cannot be set as a value! Only string, int, and double allowed!");
+                }
+            }
+        }
+
+        /// <summary>
+        ///     Creates a new <see cref="AutocompleteResult"/>.
+        /// </summary>
+        public AutocompleteResult() { }
+
+        /// <summary>
+        ///     Creates a new <see cref="AutocompleteResult"/> with the passed in <paramref name="name"/> and <paramref name="value"/>.
+        /// </summary>
+        /// <exception cref="ArgumentNullException"/>
+        /// <exception cref="ArgumentException"/>
+        public AutocompleteResult(string name, object value)
+        {
+            this.Name = name;
+            this.Value = value;
+        }
+    }
+}

src/Discord.Net.Core/Entities/Interactions/InteractionResponseType.cs

@@ -45,13 +45,18 @@ public enum InteractionResponseType : byte
         DeferredChannelMessageWithSource = 5,
 
         /// <summary>
-        ///     for components: ACK an interaction and edit the original message later; the user does not see a loading state
+        ///     For components: ACK an interaction and edit the original message later; the user does not see a loading state
         /// </summary>
         DeferredUpdateMessage = 6,
 
         /// <summary>
-        ///     for components: edit the message the component was attached to
+        ///     For components: edit the message the component was attached to
         /// </summary>
-        UpdateMessage = 7
+        UpdateMessage = 7,
+
+        /// <summary>
+        ///     Respond with a set of choices to a autocomplete interaction
+        /// </summary>
+        ApplicationCommandAutocompleteResult = 8
     }
 }

src/Discord.Net.Core/Entities/Interactions/InteractionType.cs

@@ -25,5 +25,10 @@ public enum InteractionType : byte
         ///     A <see cref="IMessageComponent"/> sent from discord.
         /// </summary>
         MessageComponent = 3,
+
+        /// <summary>
+        ///     An autocomplete request sent from discord.
+        /// </summary>
+        ApplicationCommandAutocomplete = 4,
     }
 }

src/Discord.Net.Core/Entities/Interactions/SlashCommandBuilder.cs → src/Discord.Net.Core/Entities/Interactions/Slash Commands/SlashCommandBuilder.cs

@@ -165,7 +165,7 @@ public SlashCommandBuilder WithDefaultPermission(bool value)
         /// <param name="choices">The choices of this option.</param>
         /// <returns>The current builder.</returns>
         public SlashCommandBuilder AddOption(string name, ApplicationCommandOptionType type,
-           string description, bool required = true, bool isDefault = false, List<SlashCommandOptionBuilder> options = null, params ApplicationCommandOptionChoiceProperties[] choices)
+           string description, bool required = true, bool isDefault = false, bool isAutocomplete = false, List<SlashCommandOptionBuilder> options = null, params ApplicationCommandOptionChoiceProperties[] choices)
         {
             // Make sure the name matches the requirements from discord
             Preconditions.NotNullOrEmpty(name, nameof(name));
@@ -197,6 +197,7 @@ public SlashCommandBuilder AddOption(string name, ApplicationCommandOptionType t
             option.Default = isDefault;
             option.Options = options;
             option.Type = type;
+            option.Autocomplete = isAutocomplete;
             option.Choices = choices != null ? new List<ApplicationCommandOptionChoiceProperties>(choices) : null;
 
             return AddOption(option);
@@ -288,7 +289,7 @@ public class SlashCommandOptionBuilder
         private string _description;
 
         /// <summary>
-        ///     The name of this option.
+        ///     Gets or sets the name of this option.
         /// </summary>
         public string Name
         {
@@ -309,7 +310,7 @@ public string Name
         }
 
         /// <summary>
-        ///     The description of this option.
+        ///     Gets or sets the description of this option.
         /// </summary>
         public string Description
         {
@@ -326,27 +327,32 @@ public string Description
         }
 
         /// <summary>
-        ///     The type of this option.
+        ///     Gets or sets the type of this option.
         /// </summary>
         public ApplicationCommandOptionType Type { get; set; }
 
         /// <summary>
-        ///     The first required option for the user to complete. only one option can be default.
+        ///     Gets or sets whether or not this options is the first required option for the user to complete. only one option can be default.
         /// </summary>
         public bool? Default { get; set; }
 
         /// <summary>
-        ///     <see langword="true"/> if this option is required for this command, otherwise <see langword="false"/>.
+        ///     Gets or sets if the option is required.
         /// </summary>
         public bool Required { get; set; }
 
         /// <summary>
-        ///     choices for string and int types for the user to pick from.
+        ///     Gets or sets whether or not this option supports autocomplete.
+        /// </summary>
+        public bool Autocomplete { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the choices for string and int types for the user to pick from.
         /// </summary>
         public List<ApplicationCommandOptionChoiceProperties> Choices { get; set; }
 
         /// <summary>
-        ///     If the option is a subcommand or subcommand group type, this nested options will be the parameters.
+        ///     Gets or sets if this option is a subcommand or subcommand group type, these nested options will be the parameters.
         /// </summary>
         public List<SlashCommandOptionBuilder> Options { get; set; }
 
@@ -372,7 +378,8 @@ public ApplicationCommandOptionProperties Build()
                 Required = this.Required,
                 Type = this.Type,
                 Options = this.Options?.Count > 0 ? new List<ApplicationCommandOptionProperties>(this.Options.Select(x => x.Build())) : null,
-                Choices = this.Choices
+                Choices = this.Choices,
+                Autocomplete = this.Autocomplete
             };
         }
 

src/Discord.Net.Rest/API/Common/ApplicationCommandOption.cs

@@ -30,6 +30,9 @@ internal class ApplicationCommandOption
         [JsonProperty("options")]
         public Optional<ApplicationCommandOption[]> Options { get; set; }
 
+        [JsonProperty("autocomplete")]
+        public Optional<bool> Autocomplete { get; set; }
+
         public ApplicationCommandOption() { }
 
         public ApplicationCommandOption(IApplicationCommandOption cmd)
@@ -78,6 +81,7 @@ public ApplicationCommandOption(Discord.ApplicationCommandOptionProperties optio
             this.Name = option.Name;
             this.Type = option.Type;
             this.Description = option.Description;
+            this.Autocomplete = option.Autocomplete;
         }
     }
 }

src/Discord.Net.Rest/API/Common/AutocompleteInteractionData.cs

@@ -0,0 +1,27 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Discord.API
+{
+    internal class AutocompleteInteractionData : IDiscordInteractionData
+    {
+        [JsonProperty("id")]
+        public ulong Id { get; set; }
+
+        [JsonProperty("name")]
+        public string Name { get; set; }
+
+        [JsonProperty("type")]
+        public ApplicationCommandType Type { get; set; }
+
+        [JsonProperty("version")]
+        public ulong Version { get; set; }
+
+        [JsonProperty("options")]
+        public AutocompleteInteractionDataOption[] Options { get; set; }
+    }
+}

src/Discord.Net.Rest/API/Common/AutocompleteInteractionDataOption.cs

@@ -0,0 +1,24 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Discord.API
+{
+    internal class AutocompleteInteractionDataOption
+    {
+        [JsonProperty("type")]
+        public ApplicationCommandOptionType Type { get; set; }
+
+        [JsonProperty("name")]
+        public string Name { get; set; }
+
+        [JsonProperty("value")]
+        public object Value { get; set; }
+
+        [JsonProperty("focused")]
+        public bool Focused { get; set; }
+    }
+}

src/Discord.Net.Rest/API/Common/InteractionCallbackData.cs

@@ -21,5 +21,8 @@ internal class InteractionCallbackData
 
         [JsonProperty("components")]
         public Optional<API.ActionRowComponent[]> Components { get; set; }
+
+        [JsonProperty("choices")]
+        public Optional<API.ApplicationCommandOptionChoice[]> Choices { get; set; }
     }
 }