Add /about command

Commands/AboutCommandGroup.cs

@@ -0,0 +1,79 @@
+using System.ComponentModel;
+using System.Text;
+using Boyfriend.Services.Data;
+using Remora.Commands.Attributes;
+using Remora.Commands.Groups;
+using Remora.Discord.API.Abstractions.Rest;
+using Remora.Discord.Commands.Contexts;
+using Remora.Discord.Commands.Feedback.Services;
+using Remora.Discord.Extensions.Embeds;
+using Remora.Discord.Extensions.Formatting;
+using Remora.Results;
+
+// ReSharper disable ClassNeverInstantiated.Global
+// ReSharper disable UnusedMember.Global
+
+namespace Boyfriend.Commands;
+
+/// <summary>
+///     Handles the command to show information about this bot: /about
+/// </summary>
+public class AboutCommandGroup : CommandGroup {
+    private readonly ICommandContext        _context;
+    private readonly GuildDataService       _dataService;
+    private readonly FeedbackService        _feedbackService;
+    private readonly IDiscordRestUserAPI    _userApi;
+
+    public AboutCommandGroup(
+        ICommandContext context, GuildDataService dataService,
+        FeedbackService feedbackService, IDiscordRestUserAPI userApi) {
+        _context = context;
+        _dataService = dataService;
+        _feedbackService = feedbackService;
+        _userApi = userApi;
+    }
+
+    private static readonly string[] Developers = { "Octol1ttle", "mctaylors", "neroduckale" };
+
+    /// <summary>
+    ///     A slash command that shows information about this bot.
+    /// </summary>
+    /// <returns>
+    ///     A feedback sending result which may or may not have succeeded.
+    /// </returns>
+    [Command("about")]
+    [Description("отображает список разработчиков")]
+    public async Task<Result> GetPingAsync() {
+        if (!_context.TryGetContextIDs(out var guildId, out _, out _))
+            return Result.FromError(
+                new ArgumentNullError(nameof(_context), "Unable to retrieve necessary IDs from command context"));
+
+        var currentUserResult = await _userApi.GetCurrentUserAsync(CancellationToken);
+        if (!currentUserResult.IsDefined(out var currentUser))
+            return Result.FromError(currentUserResult);
+
+        var cfg = await _dataService.GetConfiguration(guildId.Value);
+        Messages.Culture = cfg.GetCulture();
+
+        var builder = new StringBuilder().AppendLine(Markdown.Bold(Messages.AboutTitleDevelopers));
+
+        foreach (var dev in Developers) {
+            builder.Append($"@{dev} — ")
+                   .AppendLine($"AboutDeveloper@{dev}".Localized());
+        }
+        builder.AppendLine()
+               .AppendLine(Markdown.Bold(Messages.AboutTitleWiki))
+               .AppendLine("https://github.com/TeamOctolings/Boyfriend/wiki");
+
+        var description = builder.ToString();
+
+        var embed = new EmbedBuilder().WithSmallTitle(Messages.AboutBot, currentUser)
+            .WithDescription(description)
+            .WithColour(ColorsList.Cyan)
+            .WithImageUrl("https://media.discordapp.net/attachments/837385840946053181/1125009665592393738/boyfriend.png")
+            .Build();
+        if (!embed.IsDefined(out var built)) return Result.FromError(embed);
+
+        return (Result)await _feedbackService.SendContextualEmbedAsync(built, ct: CancellationToken);
+    }
+}