Move focus to main window of process if it's already running

src/Jarvis.Addin.Files/FileProvider.cs

@@ -7,14 +7,18 @@
 using System.Diagnostics;
 using System.Linq;
 using System.Net;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Media;
 using Jarvis.Addin.Files.Drawing;
 using Jarvis.Addin.Files.Indexing;
 using Jarvis.Core;
+using Jarvis.Core.Interop;
 using JetBrains.Annotations;
+using Spectre.System.IO;
 using static Jarvis.Addin.Files.Sources.Uwp.ShellInterop;
+using Path = System.IO.Path;
 
 namespace Jarvis.Addin.Files
 {
@@ -55,7 +59,33 @@ protected override Task ExecuteAsync(FileResult result)
 
                 if (result.Path.Scheme == "shell")
                 {
-                    Process.Start(path);
+                    var descriptionPath = result.Description.Replace("/", "\\");
+                    var existingProcess = Process
+                        .GetProcesses()
+                        .FirstOrDefault(process =>
+                        {
+                            var processPath = new StringBuilder(1024);
+                            var size = processPath.Capacity;
+                            var processHandle = Kernel32.OpenProcess(0x1000, false, process.Id);
+                            Kernel32.QueryFullProcessImageName(processHandle, 0, processPath, out size);
+                            return processPath.ToString() == descriptionPath;
+                        });
+
+                    if (existingProcess != null)
+                    {
+                        Win32.SetForegroundWindow(existingProcess.MainWindowHandle);
+
+                        var rect = new Win32.W32Rect();
+                        Win32.GetWindowRect(existingProcess.MainWindowHandle, ref rect);
+                        if (rect.Top < 0 && rect.Right < 0 && rect.Bottom < 0 && rect.Left < 0) // Window is minimized
+                        {
+                            Win32.ShowWindow(existingProcess.MainWindowHandle, 1);
+                        }
+                    }
+                    else
+                    {
+                        Process.Start(path);
+                    }
                 }
                 else if (result.Path.Scheme == "uwp")
                 {

src/Jarvis.Core/Interop/Kernel32.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Jarvis.Core.Interop
+{
+    public static class Kernel32
+    {
+        [DllImport("kernel32.dll")]
+        public static extern IntPtr OpenProcess(int access, bool inherit, int proccessId);
+
+        [DllImport("kernel32.dll")]
+        public static extern IntPtr QueryFullProcessImageName(IntPtr hprocess, int dwFlags, [Out] StringBuilder lpExeName, [Out] [MarshalAs(UnmanagedType.U4)] out int size);
+    }
+}

src/Jarvis.Core/Interop/Win32.Window.cs

@@ -14,5 +14,11 @@ public static partial class Win32
 
         [DllImport("user32.dll")]
         public static extern bool GetWindowRect(IntPtr hwnd, ref W32Rect rectangle);
+
+        [DllImport("user32.dll")]
+        public static extern bool SetForegroundWindow(IntPtr hwnd);
+
+        [DllImport("user32.dll")]
+        public static extern bool ShowWindow(IntPtr hwnd, int nCmdShow);
     }
 }

src/Jarvis.Core/Jarvis.Core.csproj

@@ -79,6 +79,7 @@
     <Compile Include="Extensions\SettingStoreExtensions.cs" />
     <Compile Include="IAddin.cs" />
     <Compile Include="IInitializable.cs" />
+    <Compile Include="Interop\Kernel32.cs" />
     <Compile Include="ISettings.cs" />
     <Compile Include="Interop\Win32.Shell.cs" />
     <Compile Include="Interop\Win32.Common.cs" />