Task1

Task1/Task1.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Task1", "Task1\Task1.csproj", "{C07D4625-89EF-422D-A185-BF155104BAE8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C07D4625-89EF-422D-A185-BF155104BAE8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C07D4625-89EF-422D-A185-BF155104BAE8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C07D4625-89EF-422D-A185-BF155104BAE8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C07D4625-89EF-422D-A185-BF155104BAE8}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Task1/Task1/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+    </startup>
+</configuration>

Task1/Task1/OS.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NUnit.Framework;
+
+namespace Task1
+{
+    class OS
+    {
+        private Stack<string> _dirs;
+
+        public OS(string path=null)
+        {
+            _dirs = new Stack<string>();
+            if (string.IsNullOrEmpty(path)) return;
+
+            foreach (string dir in path.Split('\\')) 
+            {
+                if (dir == "..")
+                {
+                    _dirs.Pop();
+                }
+                else
+                {
+                    if (dir!="")
+                        _dirs.Push(dir);
+                }
+            }
+        }    
+
+        public string Path()
+        {
+            if (_dirs.Count <= 0)
+            {
+                return "\\";
+            }
+            string result = "";
+            foreach(string dir in _dirs)
+            {
+                if (result == "")
+                {
+                    result = dir;
+                    continue;
+                }
+                result = dir + "\\" + result;
+            }
+            result = "\\" + result;
+            return result;
+        }
+
+        public string Listen(string cmd)
+        {
+            string[] _args = cmd.Split(' ');
+            string _errorMsg = "Incorrect input.";
+
+            if (_args.Count() <= 0) 
+            {
+                return _errorMsg;
+            }
+            switch (_args[0])
+            {
+                case "cd":
+                    {
+                        if (_args.Count() <= 1) return _errorMsg;
+
+                        string _path = _args[1];
+                        if (string.IsNullOrEmpty(_path))
+                        {
+                            return _errorMsg;
+                        }
+
+                        if (_path[0] == '\\')
+                        {
+                            _dirs.Clear();
+
+                        }
+
+                        foreach (string dir in _path.Split('\\'))
+                        {
+                            switch (dir)
+                            {
+                                case "":
+                                    {
+                                        _dirs.Clear();
+                                        break;
+                                    }
+                                case "..":
+                                    {
+                                        if (_dirs.Count>0)
+                                            _dirs.Pop();
+                                        break;
+                                    }
+                                default:
+                                    {
+                                        _dirs.Push(dir);
+                                        break;
+                                    }
+                            }
+
+                        }
+
+                        return Path();
+                    }
+                case "pwd":
+                    {
+                        return Path();
+                    }
+                default:
+                    {
+                        return _errorMsg;
+                    }
+            }
+        }
+
+
+        #region NUnit tests for all methods.
+
+        [TestFixture]
+        public class TestClass 
+        {
+            [Test]
+            public void Path_Test()
+            {
+                OS item = new OS();
+                item._dirs = new Stack<string>();
+                item._dirs.Push("home");
+                item._dirs.Push("movies");
+                item._dirs.Push("horrors");
+                Assert.AreEqual("\\home\\movies\\horrors", item.Path());
+                for (int i = 0; i < 3; i++)
+                {
+                    item._dirs.Pop();
+                }
+                Assert.AreEqual("\\", item.Path());
+            }
+
+            [Test]
+            public void Constructor_Test()
+            {
+                OS item = new OS();
+                Assert.IsEmpty(item._dirs);
+                item = new OS("\\");
+                Assert.IsEmpty(item._dirs);
+                item = new OS("\\home\\programs\\..\\movies");
+                item = new OS("home\\movies");
+                Assert.AreEqual("\\home\\movies", item.Path());
+            }
+
+            [Test]
+            public void Listen_Test()
+            {
+                OS item = new OS();
+                string errorMsg = "Incorrect input.";
+                Assert.AreEqual(errorMsg, item.Listen(""));
+                Assert.AreEqual(errorMsg, item.Listen("cd "));
+                Assert.AreEqual(errorMsg, item.Listen("\\"));
+                Assert.AreEqual("\\", item.Listen("cd \\"));
+                Assert.AreEqual("\\", item.Listen("cd home\\.."));
+                item.Listen("cd \\home\\movies\\horrors");
+                Assert.AreEqual("\\home\\movies\\horrors", item.Listen("pwd"));
+            }
+        }
+        #endregion
+
+    }
+}

Task1/Task1/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Task1
+{
+    class Program
+    {
+        static void Main()
+        {
+            OS vasya = new OS();
+            Console.WriteLine(vasya.Listen("pwd"));
+            vasya.Listen("cd \\home\\myfolder\\vasya\\..\\petya\\..");
+            Console.WriteLine(vasya.Listen("pwd"));
+            Console.ReadLine();
+        }
+    }
+}

Task1/Task1/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// Управление общими сведениями о сборке осуществляется с помощью 
+// набора атрибутов. Измените значения этих атрибутов, чтобы изменить сведения,
+// связанные со сборкой.
+[assembly: AssemblyTitle("Task1")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Task1")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Параметр ComVisible со значением FALSE делает типы в сборке невидимыми 
+// для COM-компонентов.  Если требуется обратиться к типу в этой сборке через 
+// COM, задайте атрибуту ComVisible значение TRUE для этого типа.
+[assembly: ComVisible(false)]
+
+// Следующий GUID служит для идентификации библиотеки типов, если этот проект будет видимым для COM
+[assembly: Guid("6b81b538-139a-44e8-821e-5266075c5133")]
+
+// Сведения о версии сборки состоят из следующих четырех значений:
+//
+//      Основной номер версии
+//      Дополнительный номер версии 
+//      Номер построения
+//      Редакция
+//
+// Можно задать все значения или принять номер построения и номер редакции по умолчанию, 
+// используя "*", как показано ниже:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Task1/Task1/Task1.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{C07D4625-89EF-422D-A185-BF155104BAE8}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Task1</RootNamespace>
+    <AssemblyName>Task1</AssemblyName>
+    <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="nunit.framework, Version=2.6.3.13283, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL" />
+    <Reference Include="nunit.mocks, Version=2.6.3.13283, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="OS.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <WCFMetadata Include="Service References\" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Task1/Task1/bin/Debug/Task1.exe.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+    </startup>
+</configuration>

Task1/Task1/bin/Debug/Task1.vshost.exe.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+    </startup>
+</configuration>

Task1/Task1/obj/Debug/Task1.csproj.FileListAbsolute.txt

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+E:\Git\Local\xpk\Task1\Task1\bin\Debug\Task1.exe.config
+E:\Git\Local\xpk\Task1\Task1\obj\Debug\Task1.csprojResolveAssemblyReference.cache
+E:\Git\Local\xpk\Task1\Task1\bin\Debug\Task1.exe
+E:\Git\Local\xpk\Task1\Task1\bin\Debug\Task1.pdb
+E:\Git\Local\xpk\Task1\Task1\obj\Debug\Task1.exe
+E:\Git\Local\xpk\Task1\Task1\obj\Debug\Task1.pdb
+E:\Git\Local\xpk\Task1\Task1\bin\Debug\nunit.framework.dll
+E:\Git\Local\xpk\Task1\Task1\bin\Debug\nunit.mocks.dll
+E:\Git\Local\xpk\Task1\Task1\bin\Debug\nunit.framework.xml