Program.cs

using System.Text;
using YamlDotNet.Serialization;

void printUsage() {
    var f = ConfigProvider.ConfigFilePath;

    Console.WriteLine(@$"Usage:
    -d / --deliver <project-name>[ <project-name>]  Delivers the project(s)

    --d-all                                         Delivers all configured projects

    --d-git-repo <git-repo-path> [<branch>]         Delivers all projects from the given git repo.
                                                     <branch> is for the hooking script to trigger 
                                                     on a specific branch.
      
    --hook                                          Hooks all configured projects.
                                                     If there is already a hook present,
                                                     simply call this executable with the -g param.

    --example-config                                Prints the example config
                                                     ddleiver --example-config > {f}");
}

if (!args.Any()) {
    Console.WriteLine("No Arguments provided!");
    printUsage();
    return;
}

var serializer = new SerializerBuilder().Build();
var deserializer = new DeserializerBuilder().Build();

if (args[0] == "--example-config") {
    var yaml = serializer.Serialize(ConfigProvider.ExampleConfig);
    Console.WriteLine(yaml);
    return;
}

ServerConfig serverConfig;
try { 
    serverConfig = ConfigProvider.GetConfig(deserializer);
} catch (Exception ex) {
    Console.WriteLine(@$"Could not load configuration
    Expection: {ex.Message}
        ({ex.InnerException?.Message})");
    return;
}

var deliverer = new DeliveryService(serverConfig);

switch (args[0]) {
    case "-h":
    case "--help":
        printUsage();
        return;

    case "-d":
    case "--deliver":
        if (args.Length == 1)
            throw new Exception("No prject(s) provided to deliver!");

        foreach (var projectName in args[1..])
            deliverer.Deliver(projectName);

        return;

    case "--d-all":
        foreach (var projectName in serverConfig.Projects.Keys)
            deliverer.Deliver(projectName);

        return;

    case "--d-git-repo":
        if (args.Length == 1)
            throw new Exception("No prject provided to deliver!");

        var effectedRepo = args[1];
        
        Console.WriteLine($"[INFO] Deliver holy(!) repo '{effectedRepo}'");
        var projects = serverConfig.Projects.Where(w => effectedRepo == w.Value.GitRepo);

        if (args.Length >= 3) {
            Console.WriteLine($"[INFO] Only on branch '{args[2]}'");
            projects = projects.Where(w => args[2].Contains(w.Value.OnBranch));
        }

        foreach (var (projectName, _) in projects)
            deliverer.Deliver(projectName);

        return;

    case "--hook":
        var location = System.Diagnostics.Process.GetCurrentProcess().MainModule?.FileName;
        if (location is null) {
            Console.Error.WriteLine("[ERRO] Couldn find Folder of executing file");
        }

        Console.WriteLine($"[INFO] Start hooking repos to {location}");
        foreach (var projectPath in serverConfig.Projects.Select(s => s.Value.GitRepo).Distinct()) {
            Console.WriteLine($"[INFO] Hooking {projectPath}");

            var scriptPath = $"{projectPath}/hooks/post-receive";
            var script = $"#!/bin/bash\n" +
                $"### Autogenerated from DDeliver: {{{location}}}\n" +
                $"read oldrev newrev ref\n" +
                $"{location} --d-git-repo {ExtensionMethods.EscapeForCommand(projectPath)} $ref\n";

            if (File.Exists(scriptPath)) {
                Console.WriteLine("[INFO] " +
                    (File.ReadAllText(scriptPath) == script ?
                        $"SCRIPT ALREADY HOOKED at {projectPath}! Psst, dont wake the bugs!" :
                        $"There already exists a post-receive script in repo {projectPath}!") + 
                        " Skipping for now..."
                );
                continue;
            }

            File.WriteAllText(scriptPath, script, new UTF8Encoding(false));
            Chmod.SetPerimissions(scriptPath, "775");

            Console.WriteLine("[INFO] Hooked repo");
        }
        break;

    default:
        Console.WriteLine("Command not found!");
        printUsage();
        break;
}