feature: add powershell support for Windows

src/Models/ExternalTool.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+
+namespace SourceGit.Models
+{
+    public class ExternalTool
+    {
+        public string Name { get; set; } = string.Empty;
+        public string Icon { get; set; } = string.Empty;
+        public string Executable { get; set; } = string.Empty;
+        public string OpenCmdArgs { get; set; } = string.Empty;
+
+        public void Open(string repo)
+        {
+            Process.Start(new ProcessStartInfo()
+            {
+                WorkingDirectory = repo,
+                FileName = Executable,
+                Arguments = string.Format(OpenCmdArgs, repo),
+                UseShellExecute = false,
+            });
+        }
+    }
+
+    public class ExternalToolsFinder
+    {
+        public List<ExternalTool> Founded
+        {
+            get;
+            private set;
+        } = new List<ExternalTool>();
+
+        public void VSCode(Func<string> platform_finder)
+        {
+            TryAdd("Visual Studio Code", "vscode.png", "\"{0}\"", "VSCODE_PATH", platform_finder);
+        }
+
+        public void VSCodeInsiders(Func<string> platform_finder)
+        {
+            TryAdd("Visual Studio Code - Insiders", "vscode_insiders.png", "\"{0}\"", "VSCODE_INSIDERS_PATH", platform_finder);
+        }
+
+        public void Fleet(Func<string> platform_finder)
+        {
+            TryAdd("JetBrains Fleet", "fleet.png", "\"{0}\"", "FLEET_PATH", platform_finder);
+        }
+
+        public void SublimeText(Func<string> platform_finder)
+        {
+            TryAdd("Sublime Text", "sublime_text.png", "\"{0}\"", "SUBLIME_TEXT_PATH", platform_finder);
+        }
+
+        public void TryAdd(string name, string icon, string args, string env, Func<string> finder)
+        {
+            var path = Environment.GetEnvironmentVariable(env);
+            if (string.IsNullOrEmpty(path) || !File.Exists(path))
+            {
+                path = finder();
+                if (string.IsNullOrEmpty(path) || !File.Exists(path))
+                    return;
+            }
+
+            Founded.Add(new ExternalTool
+            {
+                Name = name,
+                Icon = icon,
+                OpenCmdArgs = args,
+                Executable = path,
+            });
+        }
+    }
+}