Add system extension for Process

action/default-build-script/Assets/Editor/System.meta

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+fileFormatVersion: 2
+guid: b5da3bd7e18c43d79243410166c8dc9a
+timeCreated: 1587493708

action/default-build-script/Assets/Editor/System/ProcessExtensions.cs

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+using System.Diagnostics;
+using System.Text;
+
+public static class ProcessExtensions
+{
+  // Execute an application or binary with given arguments
+  //
+  // See: https://stackoverflow.com/questions/4291912/process-start-how-to-get-the-output
+  public static int Run(this Process process, string application,
+    string arguments, string workingDirectory, out string output,
+    out string errors)
+  {
+    // Configure how to run the application
+    process.StartInfo = new ProcessStartInfo {
+      CreateNoWindow = true,
+      UseShellExecute = false,
+      RedirectStandardError = true,
+      RedirectStandardOutput = true,
+      FileName = application,
+      Arguments = arguments,
+      WorkingDirectory = workingDirectory
+    };
+
+    // Read the output
+    var outputBuilder = new StringBuilder();
+    var errorsBuilder = new StringBuilder();
+    process.OutputDataReceived += (_, args) => outputBuilder.AppendLine(args.Data);
+    process.ErrorDataReceived += (_, args) => errorsBuilder.AppendLine(args.Data);
+
+    // Run the application and wait for it to complete
+    process.Start();
+    process.BeginOutputReadLine();
+    process.BeginErrorReadLine();
+    process.WaitForExit();
+
+    // Format the output
+    output = outputBuilder.ToString().TrimEnd();
+    errors = errorsBuilder.ToString().TrimEnd();
+
+    return process.ExitCode;
+  }
+}

action/default-build-script/Assets/Editor/System/ProcessExtensions.cs.meta

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+fileFormatVersion: 2
+guid: 29c1880a390c4af7be821b7877602815
+timeCreated: 1587494270