noz-cli/NozCli/Commands/MkdirCommand.cs

using NozCli.Core.Security;
using NozCli.Repl;
using Spectre.Console;

namespace NozCli.Commands;

public class MkdirCommand : ICommand
{
    public string Name        => "mkdir";
    public string Description => "Create a new folder (writes _index.md)";
    public string Usage       => "mkdir <folder-name>";

    public async Task ExecuteAsync(string[] args, ReplContext ctx, CancellationToken ct = default)
    {
        var folderArg = args.FirstOrDefault();
        if (folderArg is null)
        {
            AnsiConsole.MarkupLine("[red]Usage:[/] mkdir <folder-name>");
            return;
        }

        // Resolve full folder path relative to current navigation
        var folderPath = ResolveFolderPath(folderArg.TrimEnd('/'), ctx);

        if (!SlugGuard.IsValid(folderPath))
        {
            AnsiConsole.MarkupLine("[red]Ungültiger Ordnername.[/] Nur Kleinbuchstaben, Ziffern und Bindestriche erlaubt.");
            return;
        }

        // Derive a readable title from the last segment
        var lastSegment = folderPath.Split('/')[^1];
        var title       = ToTitle(lastSegment);

        await AnsiConsole.Status().StartAsync($"Erstelle [cyan]{folderPath}[/]…", async _ =>
            await ctx.Api.PutFolderIndexAsync(folderPath, title, ct: ct));

        // Navigate into the new folder
        NavigateInto(folderPath, ctx);

        AnsiConsole.MarkupLine($"[green]✓[/] Ordner erstellt → {ctx.CurrentPath}");
        AnsiConsole.MarkupLine($"[dim]Erstelle deine erste Notiz mit [white]new <name>[/][/]");
    }

    private static string ResolveFolderPath(string segment, ReplContext ctx)
    {
        // Already a full multi-segment path (user typed full slug)
        if (segment.Contains('/')) return segment;

        if (ctx.CurrentTopic is null)
            return segment;

        if (ctx.CurrentSubPath is null)
            return $"{ctx.CurrentTopic}/{segment}";

        return $"{ctx.CurrentTopic}/{ctx.CurrentSubPath}/{segment}";
    }

    private static void NavigateInto(string folderPath, ReplContext ctx)
    {
        var parts = folderPath.Split('/');
        if (parts.Length == 1)
        {
            ctx.CurrentTopic   = parts[0];
            ctx.CurrentSubPath = null;
        }
        else
        {
            ctx.CurrentTopic   = parts[0];
            ctx.CurrentSubPath = string.Join('/', parts[1..]);
        }
    }

    // "new-subfolder" → "New Subfolder"
    private static string ToTitle(string slug) =>
        string.Join(' ', slug.Split('-').Select(Capitalize));

    private static string Capitalize(string s) =>
        s.Length == 0 ? s : char.ToUpperInvariant(s[0]) + s[1..];
}