Use xdotool to get foreground window on linux x11

Author: FaithBeam

README.md

@@ -7,9 +7,9 @@ This is an attempt at a cross-platform clone of X-Mouse-Button-Control.
 ## Usage
 
 1. Download the latest release from the [Releases](https://github.com/FaithBeam/YMouseButtonControl/releases) page for your platform
-     * Alternatively download the latest build from the [Actions tab](https://github.com/FaithBeam/YMouseButtonControl/actions)
-3. Extract the archive
-4. Run YMouseButtonControl
+     * Alternatively, download the latest build from the [Actions tab](https://github.com/FaithBeam/YMouseButtonControl/actions)
+2. Extract the archive
+3. Run YMouseButtonControl
 
 ## OS Compatibility
 
@@ -24,6 +24,14 @@ Anything that can install .NET 8 should be able to run YMouseButtonControl
 | Ubuntu               | 20.04+      |
 | macOS                | 12.0+       |
 
+##  Linux Recommended Software
+
+* xdotool (x11 only)
+  * ```sudo apt install xdotool```
+  * This is used to retrieve the foreground window name
+
+If you don't install xdotool or use wayland, every window will match when doing a mouse press.
+
 ## Build
 
 ### Requirements

YMouseButtonControl.Linux/Services/CurrentWindowService.cs

@@ -4,6 +4,5 @@ namespace YMouseButtonControl.Linux.Services;
 
 public class CurrentWindowService : ICurrentWindowService
 {
-    // Match every window. If someone figures out how to get the current window in X11 and/or wayland, make a PR please
-    public string ForegroundWindow { get; } = "*";
-}
+    public string ForegroundWindow => "*";
+}

YMouseButtonControl.Linux/Services/CurrentWindowServiceX11.cs

@@ -0,0 +1,34 @@
+using System.Diagnostics;
+using YMouseButtonControl.Core.Services.Processes;
+
+namespace YMouseButtonControl.Linux.Services;
+
+public class CurrentWindowServiceX11 : ICurrentWindowService
+{
+    public string ForegroundWindow => GetForegroundWindow();
+
+    private string GetForegroundWindow()
+    {
+        var startInfo = new ProcessStartInfo
+            { FileName = "/bin/bash", Arguments = "-c \"xdotool getwindowfocus getwindowpid\"", RedirectStandardOutput = true };
+        using var xdoProc = new Process();
+        xdoProc.StartInfo = startInfo;
+        xdoProc.Start();
+        var pid = xdoProc.StandardOutput.ReadToEnd().TrimEnd();
+        xdoProc.WaitForExit();
+
+        if (string.IsNullOrWhiteSpace(pid))
+        {
+            return "";
+        }
+        
+        startInfo = new ProcessStartInfo
+            { FileName = "/bin/bash", Arguments = $"-c \"ls -l /proc/{pid}/exe\"", RedirectStandardOutput = true };
+        using var proc = new Process();
+        proc.StartInfo = startInfo;
+        proc.Start();
+        var path = proc.StandardOutput.ReadToEnd().Split("-> ")[1].Trim();
+        proc.WaitForExit();
+        return path;
+    }
+}

YMouseButtonControl/DependencyInjection/ServicesBootstrapper.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Runtime.Versioning;
 using Microsoft.Extensions.DependencyInjection;
 using YMouseButtonControl.Core.Services.BackgroundTasks;
@@ -51,8 +52,33 @@ private static void RegisterLinuxServices(IServiceCollection services)
         services
             .AddScoped<IStartupInstallerService, Linux.Services.StartupInstallerService>()
             .AddScoped<IProcessMonitorService, Linux.Services.ProcessMonitorService>()
-            .AddScoped<ICurrentWindowService, Linux.Services.CurrentWindowService>()
             .AddScoped<IBackgroundTasksRunner, Linux.Services.BackgroundTasksRunner>();
+        if (Environment.GetEnvironmentVariable("XDG_SESSION_TYPE") == "x11")
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = "/bin/bash",
+                Arguments = "-c \"xdotool\"",
+                RedirectStandardOutput = true,
+                RedirectStandardError = true
+            };
+            using var proc = new Process();
+            proc.StartInfo = startInfo;
+            proc.Start();
+            proc.WaitForExit();
+            if (proc.ExitCode == 1)
+            {
+                services.AddScoped<ICurrentWindowService, Linux.Services.CurrentWindowServiceX11>();
+            }
+            else
+            {
+                services.AddScoped<ICurrentWindowService, Linux.Services.CurrentWindowService>();
+            }
+        }
+        else
+        {
+            services.AddScoped<ICurrentWindowService, Linux.Services.CurrentWindowService>();
+        }
     }
 
     [SupportedOSPlatform("windows5.1.2600")]
@@ -73,4 +99,4 @@ private static void RegisterMacOsServices(IServiceCollection services)
             .AddScoped<ICurrentWindowService, MacOS.Services.CurrentWindowService>()
             .AddScoped<IBackgroundTasksRunner, MacOS.Services.BackgroundTasksRunner>();
     }
-}
+}