Terminal.Gui/UnitTests/ClipboardTests.cs

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using Xunit;
using Xunit.Abstractions;

namespace Terminal.Gui.ConsoleDrivers {
	public class ClipboardTests {

		[Fact, AutoInitShutdown (useFakeClipboard: false)]
		public void Contents_Gets_Sets ()
		{
			var clipText = "This is a clipboard unit test.";
			Clipboard.Contents = clipText;

			Application.Iteration += () => Application.RequestStop ();
			Application.Run ();

			Assert.Equal (clipText, Clipboard.Contents);
		}

		[Fact, AutoInitShutdown (useFakeClipboard: false)]
		public void IsSupported_Get ()
		{
			if (Clipboard.IsSupported) {
				Assert.True (Clipboard.IsSupported);
			} else {
				Assert.False (Clipboard.IsSupported);
			}
		}

		[Fact, AutoInitShutdown (useFakeClipboard: false)]
		public void TryGetClipboardData_Gets_From_OS_Clipboard ()
		{
			var clipText = "Trying to get from the OS clipboard.";
			Clipboard.Contents = clipText;

			Application.Iteration += () => Application.RequestStop ();

			Application.Run ();

			if (Clipboard.IsSupported) {
				Assert.True (Clipboard.TryGetClipboardData (out string result));
				Assert.Equal (clipText, result);
			} else {
				Assert.False (Clipboard.TryGetClipboardData (out string result));
				Assert.NotEqual (clipText, result);
			}
		}

		[Fact, AutoInitShutdown (useFakeClipboard: false)]
		public void TrySetClipboardData_Sets_The_OS_Clipboard ()
		{
			var clipText = "Trying to set the OS clipboard.";
			if (Clipboard.IsSupported) {
				Assert.True (Clipboard.TrySetClipboardData (clipText));
			} else {
				Assert.False (Clipboard.TrySetClipboardData (clipText));
			}

			Application.Iteration += () => Application.RequestStop ();

			Application.Run ();

			if (Clipboard.IsSupported) {
				Assert.Equal (clipText, Clipboard.Contents);
			} else {
				Assert.NotEqual (clipText, Clipboard.Contents);
			}
		}


		[Fact, AutoInitShutdown (useFakeClipboard: false)]
		public void Contents_Gets_From_OS_Clipboard ()
		{
			var clipText = "This is a clipboard unit test to get clipboard from OS.";
			var failed = false;
			var getClipText = "";

			Application.Iteration += () => {
				if (RuntimeInformation.IsOSPlatform (OSPlatform.Windows)) {
					ClipboardProcessRunner.Process ("pwsh", $"-command \"Set-Clipboard -Value \\\"{clipText}\\\"\"");
					getClipText = Clipboard.Contents.ToString ();

				} else if (RuntimeInformation.IsOSPlatform (OSPlatform.OSX)) {
					ClipboardProcessRunner.Process ("pbcopy", string.Empty, clipText);
					getClipText = Clipboard.Contents.ToString ();

				} else if (RuntimeInformation.IsOSPlatform (OSPlatform.Linux)) {
					if (Is_WSL_Platform ()) {
						try {
							// This runs the WINDOWS version of powershell.exe via WSL.
							ClipboardProcessRunner.Process ("powershell.exe", $"-noprofile -command \"Set-Clipboard -Value \\\"{clipText}\\\"\"");
						} catch {
							failed = true;
						}
						if (!failed) {
							getClipText = Clipboard.Contents.ToString ();
						}
						Application.RequestStop ();
						return;
					}

					if (failed = xclipExists () == false) {
						// xclip doesn't exist then exit.
						Application.RequestStop ();
						return;
					}

					// If we get here, powershell didn't work and xclip exists...
					ClipboardProcessRunner.Process ("bash", $"-c \"xclip -sel clip -i\"", clipText);

					if (!failed) {
						getClipText = Clipboard.Contents.ToString ();
					}
				}

				Application.RequestStop ();
			};

			Application.Run ();

			if (!failed) {
				Assert.Equal (clipText, getClipText);
			}
		}


		[Fact, AutoInitShutdown (useFakeClipboard: false)]
		public void Contents_Sets_The_OS_Clipboard ()
		{
			var clipText = "This is a clipboard unit test to set the OS clipboard.";
			var clipReadText = "";
			var failed = false;

			Application.Iteration += () => {
				Clipboard.Contents = clipText;

				if (RuntimeInformation.IsOSPlatform (OSPlatform.Windows)) {
					(_, clipReadText) = ClipboardProcessRunner.Process ("pwsh", "-noprofile -command \"Get-Clipboard\"");

				} else if (RuntimeInformation.IsOSPlatform (OSPlatform.OSX)) {
					(_, clipReadText) = ClipboardProcessRunner.Process ("pbpaste", "");

				} else if (RuntimeInformation.IsOSPlatform (OSPlatform.Linux)) {
					var exitCode = 0;
					if (Is_WSL_Platform ()) {
						(exitCode, clipReadText) = ClipboardProcessRunner.Process ("powershell.exe", "-noprofile -command \"Get-Clipboard\"");
						if (exitCode == 0) {
							Application.RequestStop ();
							return;
						}
						failed = true;
					}

					if (failed = xclipExists () == false) {
						// xclip doesn't exist then exit.
						Application.RequestStop ();
						return;
					}

					(exitCode, clipReadText) = ClipboardProcessRunner.Process ("bash", $"-c \"xclip -sel clip -o\"");
					Assert.Equal (0, exitCode);
				}

				Application.RequestStop ();
			};

			Application.Run ();

			if (!failed) {
				Assert.Equal (clipText, clipReadText);
			}

		}

		bool Is_WSL_Platform ()
		{
			var (_, result) = ClipboardProcessRunner.Process ("bash", $"-c \"uname -a\"");
			return result.Contains ("microsoft") && result.Contains ("WSL");
		}

		bool xclipExists ()
		{
			try {
				var (_, result) = ClipboardProcessRunner.Process ("bash", $"-c \"which xclip\"");
				return result.TrimEnd () != "";
			} catch (System.Exception) {
				return false;
			}
		}
	}
}