HellionChat/HellionChat/Commands.cs

using Dalamud.Game.Command;
using Microsoft.Extensions.Logging;

namespace HellionChat;

internal sealed class Commands : IDisposable
{
    private readonly Dictionary<string, CommandWrapper> Registered = [];
    private readonly ILogger<Commands> _logger;

    public Commands(ILogger<Commands> logger)
    {
        _logger = logger;
    }

    public void Dispose()
    {
        foreach (var name in Registered.Keys)
            Plugin.CommandManager.RemoveHandler(name);
    }

    internal void Initialise()
    {
        foreach (var wrapper in Registered.Values)
        {
            Plugin.CommandManager.AddHandler(
                wrapper.Name,
                new CommandInfo(Invoke)
                {
                    HelpMessage = wrapper.Description ?? string.Empty,
                    ShowInHelp = wrapper.ShowInHelp,
                }
            );
        }
    }

    internal CommandWrapper Register(
        string name,
        string? description = null,
        bool? showInHelp = null
    )
    {
        if (Registered.TryGetValue(name, out var wrapper))
        {
            if (description != null)
                wrapper.Description = description;

            if (showInHelp != null)
                wrapper.ShowInHelp = showInHelp.Value;

            return wrapper;
        }

        Registered[name] = new CommandWrapper(name, description, showInHelp ?? true);
        return Registered[name];
    }

    private void Invoke(string command, string arguments)
    {
        if (!Registered.TryGetValue(command, out var wrapper))
        {
            _logger.LogWarning($"Missing registration for command {command}");
            return;
        }

        try
        {
            wrapper.Invoke(command, arguments);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, $"Error while executing command {command}");
        }
    }
}

internal sealed class CommandWrapper
{
    internal string Name { get; }
    internal string? Description { get; set; }
    internal bool ShowInHelp { get; set; }

    internal event Action<string, string>? Execute;

    internal CommandWrapper(string name, string? description, bool showInHelp)
    {
        Name = name;
        Description = description;
        ShowInHelp = showInHelp;
    }

    internal void Invoke(string command, string arguments)
    {
        Execute?.Invoke(command, arguments);
    }
}