DiscordChatExporter/DiscordChatExporter.Cli/Commands/GetDirectChannelsCommand.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using CliFx.Binding;
using CliFx.Infrastructure;
using DiscordChatExporter.Cli.Commands.Base;
using DiscordChatExporter.Core.Discord.Data;
using DiscordChatExporter.Core.Utils.Extensions;

namespace DiscordChatExporter.Cli.Commands;

[Command("list channels dm", Description = "Gets the list of direct message channels.")]
public partial class GetDirectChannelsCommand : DiscordCommandBase
{
    public override async ValueTask ExecuteAsync(IConsole console)
    {
        await base.ExecuteAsync(console);

        var cancellationToken = console.RegisterCancellationHandler();

        var channels = (
            await Discord.GetGuildChannelsAsync(Guild.DirectMessages.Id, cancellationToken)
        )
            .OrderByDescending(c => c.LastMessageId)
            .ThenBy(c => c.Name)
            .ToArray();

        var channelIdMaxLength = channels
            .Select(c => c.Id.ToString().Length)
            .OrderDescending()
            .FirstOrDefault();

        // If output is redirected, print only channel IDs (one per line) for easy piping
        if (console.IsOutputRedirected)
        {
            foreach (var channel in channels)
                await console.Output.WriteLineAsync(channel.Id.ToString());
        }
        else
        {
            foreach (var channel in channels)
            {
                // Channel ID
                await console.Output.WriteAsync(
                    channel.Id.ToString().PadRight(channelIdMaxLength, ' ')
                );

                // Separator
                using (console.WithForegroundColor(ConsoleColor.DarkGray))
                    await console.Output.WriteAsync(" | ");

                // Channel name
                using (console.WithForegroundColor(ConsoleColor.White))
                    await console.Output.WriteLineAsync(channel.GetHierarchicalName());
            }
        }
    }
}