RevisionCommand.cs

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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Tgstation.Server.Host.Components.Repository;
using Tgstation.Server.Host.Components.Watchdog;

namespace Tgstation.Server.Host.Components.Chat.Commands
{
    sealed class RevisionCommand : ICommand
    {
        public string Name => "revision";

        public string HelpText => "Display live commit sha. Add --repo to view repository revision";

        public bool AdminOnly => false;

        readonly IWatchdog watchdog;

        readonly IRepositoryManager repositoryManager;

        readonly Models.Instance instance;

        public RevisionCommand(IWatchdog watchdog, IRepositoryManager repositoryManager, Models.Instance instance)
        {
            this.watchdog = watchdog ?? throw new ArgumentNullException(nameof(watchdog));
            this.repositoryManager = repositoryManager ?? throw new ArgumentNullException(nameof(repositoryManager));
            this.instance = instance ?? throw new ArgumentNullException(nameof(instance));
        }

        public async Task<string> Invoke(string arguments, User user, CancellationToken cancellationToken)
        {
            string result;
            if (arguments.Split(' ').Any(x => x.ToUpperInvariant() == "--REPO"))
                using (var repo = await repositoryManager.LoadRepository(cancellationToken).ConfigureAwait(false))
                {
                    if (repo == null)
                        return "Repository unavailable!";
                    result = repo.Head;
                }
            else
            {
                if (!watchdog.Running)
                    return "Server offline!";
                result = watchdog.ActiveCompileJob?.RevisionInformation.CommitSha;
            }

            return String.Format(CultureInfo.InvariantCulture, "^{0}", result);
        }
    }
}