GuerrillaCoder

Creating Neat .NET Core Command Line Apps

Every reason to get more HackerPoints™ is a good one, so today we're going to write a neat command line app in .NET Core! The Common library has a really cool package Microsoft.Extensions.CommandlineUtils to help us parse command line arguments and structure our app, but sadly it's undocumented.

No more! In this guide, we'll explore the package and write a really neat console app. We'll get good practices, a help system and argument parsing for free. Oh, it also involves ninjas. Insta-win.

	<?php

	namespace themename\setup;
	//todo: abstract actual values to another object and pass it to this contructor
	class MainThemeSetupMaster
	{
	private $cssSetup;
	private $jsSetup;
	public function __construct()
	{

	// This is a modification of https://mhusseini.wordpress.com/2014/05/03/fast-named-formats-in-c.
	// To make it work as a flexible templating system I modified it so that it can use dynamic objects
	// and silently removes unused fields.
	// I am not sure how this has effected its performance.

	using System;
	using System.Collections.Concurrent;
	using System.Collections.Generic;
	using System.Linq;
	using System.Linq.Expressions;

	// JS array equivalents to C# LINQ methods - by Dan B.

	// Here's a simple array of "person" objects
	var people = [
	{ name: "John", age: 20 },
	{ name: "Mary", age: 35 },
	{ name: "Arthur", age: 78 },
	{ name: "Mike", age: 27 },
	{ name: "Judy", age: 42 },
	{ name: "Tim", age: 8 }

	public static string RunPsqlCsvImport(string filePath, string user, string dbname, string tableName, bool hasHeaderRow)
	{
	var isLinux = RuntimeInformation.IsOSPlatform(OSPlatform.Linux);

	//WARNING: an entry for below connection must be entered in system pgpass.conf file or import will fail
	ProcessStartInfo startInfo = null;
	if (isLinux)
	{
	var args = $"-c \"cat {filePath} \| psql -h 127.0.0.1 -U {user} -d {dbname} -w -c 'copy {tableName} from stdin csv header' \" ";

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Threading;
	using System.Threading.Tasks;
	using Funq;
	using Hangfire;
	using Hangfire.Console;
	using Hangfire.Dashboard;
	using Hangfire.PostgreSql;

	dotnet add package NLog.Web.AspNetCore
	dotnet add package NLog