add vm command

Rune/cmd/VMCommand.cs

@@ -0,0 +1,83 @@
+namespace rune.cmd
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Drawing;
+    using System.IO;
+    using System.Linq;
+    using Ancient.ProjectSystem;
+    using cli;
+    using etc;
+
+    public class VMCommand
+    {
+        public AncientProject project { get; set; }
+        public static int Run(string[] args)
+        {
+            var app = new CommandLineApplication
+            {
+                Name = "rune vm",
+                FullName = "Ancient project execute in vm",
+                Description = "Execute project in Ancient VM"
+            };
+
+
+            app.HelpOption("-h|--help");
+            var dotnetBuild = new BuildCommand();
+            var vm = new VMCommand();
+            app.OnExecute(() =>
+            {
+                var buildResult = dotnetBuild.Execute(true);
+                return buildResult != 0 ? buildResult : vm.Execute();
+            });
+            try
+            {
+                return app.Execute(args);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.ToString().Color(Color.Red));
+                return 1;
+            }
+        }
+
+        public int Execute()
+        {
+            var directory = Directory.GetCurrentDirectory();
+            var projectFiles = Directory.GetFiles(directory, "*.rune.json");
+
+            if (projectFiles.Length == 0)
+            {
+                throw new InvalidOperationException(
+                    $"Couldn't find a project to run. Ensure a project exists in {directory}.");
+            }
+
+            var p = projectFiles.Single();
+
+            project = AncientProject.Open(new FileInfo(p));
+
+            var ancient_home = Environment.GetEnvironmentVariable("ANCIENT_HOME", EnvironmentVariableTarget.User);
+
+            if (ancient_home is null)
+                throw new InvalidOperationException($"env variable 'ANCIENT_HOME' is not set.");
+            if (!new DirectoryInfo(ancient_home).Exists)
+                throw new InvalidOperationException($"Env variable 'ANCIENT_HOME' is invalid.");
+
+            var vm_home = Path.Combine(ancient_home, "vm");
+            var vm_bin = Path.Combine(vm_home, "vm.exe");
+
+            if (!new DirectoryInfo(vm_home).Exists || !new FileInfo(vm_bin).Exists)
+                throw new InvalidOperationException($"Ancient VM is not installed.");
+
+            var argBuilder = new List<string>();
+
+            var files = Directory.GetFiles(Path.Combine("obj"), "*.dlx");
+
+            argBuilder.Add($"\"{files.First()}\"");
+
+            var external = new ExternalTools(vm_bin, string.Join(" ", argBuilder));
+            return external.Start().Wait().ExitCode();
+
+        }
+    }
+}