stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Interop/ToolPathResolver.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace StellaOps.Interop;
+
+internal sealed class ToolPathResolver : IToolPathResolver
+{
+    private readonly IReadOnlyDictionary<string, string> _toolPaths;
+
+    public ToolPathResolver(IReadOnlyDictionary<string, string> toolPaths)
+    {
+        _toolPaths = toolPaths ?? throw new ArgumentNullException(nameof(toolPaths));
+    }
+
+    public string? ResolveToolPath(string tool)
+    {
+        if (_toolPaths.TryGetValue(tool, out var configured) && File.Exists(configured))
+        {
+            return configured;
+        }
+
+        return FindOnPath(tool);
+    }
+
+    public static string? FindOnPath(string tool)
+    {
+        if (File.Exists(tool))
+        {
+            return Path.GetFullPath(tool);
+        }
+
+        var path = Environment.GetEnvironmentVariable("PATH");
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return null;
+        }
+
+        foreach (var dir in path.Split(Path.PathSeparator))
+        {
+            if (string.IsNullOrWhiteSpace(dir))
+            {
+                continue;
+            }
+
+            var candidate = Path.Combine(dir, tool);
+            if (File.Exists(candidate))
+            {
+                return candidate;
+            }
+
+            if (OperatingSystem.IsWindows())
+            {
+                var exeCandidate = candidate + ".exe";
+                if (File.Exists(exeCandidate))
+                {
+                    return exeCandidate;
+                }
+            }
+        }
+
+        return null;
+    }
+}