Query/AppWindows/Handlers/HandlerApps.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using Base;

namespace AppSys.Handlers {
    internal class HandlerApps : IHandler{
        private static readonly string PathSystem = Environment.GetFolderPath(Environment.SpecialFolder.System);

        private static readonly Dictionary<string, ProcessStartInfo> Mappings = new Dictionary<string, ProcessStartInfo>{
            { "audio", new ProcessStartInfo{
                FileName = Path.Combine(PathSystem, "control.exe"),
                Arguments = "mmsys.cpl"
            } },

            { "programs", new ProcessStartInfo{
                FileName = Path.Combine(PathSystem, "control.exe"),
                Arguments = "appwiz.cpl"
            } },

            { "system", new ProcessStartInfo{
                FileName = Path.Combine(PathSystem, "control.exe"),
                Arguments = "sysdm.cpl"
            } },

            { "environment", new ProcessStartInfo{
                FileName = Path.Combine(PathSystem, "rundll32.exe"),
                Arguments = "sysdm.cpl,EditEnvironmentVariables"
            } }
        };

        private static readonly Dictionary<string, string> Substitutions = new Dictionary<string, string>{
            { "sounds", "audio" },
            { "apps", "programs" },
            { "appwiz", "programs" },
            { "env", "environment" },
            { "envvars", "environment" },
            { "vars", "environment" },
            { "variables", "environment" }
        };

        public bool Matches(Command cmd){
            return Mappings.ContainsKey(cmd.Text) || Substitutions.ContainsKey(cmd.Text);
        }

        public string Handle(Command cmd){
            string key;

            if (!Substitutions.TryGetValue(cmd.Text, out key)){
                key = cmd.Text;
            }

            using(Process.Start(Mappings[key])){}
            return null;
        }
    }
}