Add /waitfordebugger argument to MGCB.

.vscode/launch.json

@@ -14,6 +14,20 @@
             "cwd": "${workspaceFolder}/Artifacts/MonoGame.Content.Builder.Editor/Mac/Debug",
             "console": "internalConsole",
             "stopAtEntry": false
+        },
+        {
+            "name": "Attach to Process",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${input.processid}",
+        }
+    ],
+    "inputs": [
+        {
+            "id": "processid",
+            "type": "promptString",
+            "default": "0",
+            "description": "Enter Process Id of process to attach to."
         }
     ]
 }

Tools/MonoGame.Content.Builder/BuildContent.cs

@@ -17,9 +17,15 @@ class BuildContent
         [CommandLineParameter(
             Name = "launchdebugger",
             Flag = "d",
-            Description = "Wait for debugger to attach before building content.")]
+            Description = "Launch the debugger before building content.")]
         public bool LaunchDebugger = false;
 
+        [CommandLineParameter(
+            Name = "waitfordebugger",
+            Flag = "a",
+            Description = "Wait for debugger to attach before building content.")]
+        public bool WaitForDebuggerToAttach = false;
+
         [CommandLineParameter(
             Name = "quiet",
             Flag = "q",
@@ -299,7 +305,7 @@ public void Build(out int successCount, out int errorCount)
 
             // If the intent is to debug build, break at the original location
             // of any exception, eg, within the actual importer/processor.
-            if (LaunchDebugger)
+            if (LaunchDebugger || WaitForDebuggerToAttach)
                 _manager.RethrowExceptions = false;
 
             // Feed all the assembly references to the pipeline manager
@@ -450,10 +456,12 @@ public void Build(out int successCount, out int errorCount)
                         var dstTime = File.GetLastWriteTimeUtc(dest);
                         if (srcTime <= dstTime)
                         {
-                            if (string.IsNullOrEmpty(c.Link))
-                                Console.WriteLine("Skipping {0}", c.SourceFile);
-                            else
-                                Console.WriteLine("Skipping {0} => {1}", c.SourceFile, c.Link);
+                            if (!Quiet) {
+                                if (string.IsNullOrEmpty(c.Link))
+                                    Console.WriteLine("Skipping {0}", c.SourceFile);
+                                else
+                                    Console.WriteLine("Skipping {0} => {1}", c.SourceFile, c.Link);
+                            }
 
                             // Copy the stats from the previous stats collection.
                             _manager.ContentStats.CopyPreviousStats(c.SourceFile);
@@ -477,10 +485,12 @@ public void Build(out int successCount, out int errorCount)
 
                     var buildTime = DateTime.UtcNow - startTime;
 
-                    if (string.IsNullOrEmpty(c.Link))
-                        Console.WriteLine("{0}", c.SourceFile);
-                    else
-                        Console.WriteLine("{0} => {1}", c.SourceFile, c.Link);
+                    if (!Quiet) {
+                        if (string.IsNullOrEmpty(c.Link))
+                            Console.WriteLine("{0}", c.SourceFile);
+                        else
+                            Console.WriteLine("{0} => {1}", c.SourceFile, c.Link);
+                    }
 
                     // Record content stats on the copy.
                     _manager.ContentStats.RecordStats(c.SourceFile, dest, "CopyItem", typeof(File), (float)buildTime.TotalSeconds);

Tools/MonoGame.Content.Builder/Program.cs

@@ -3,6 +3,8 @@
 // file 'LICENSE.txt', which is part of this source code package.
 
 using System;
+using System.Diagnostics;
+using System.Threading;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
@@ -45,6 +47,17 @@ static int Main(string[] args)
                     Console.Error.WriteLine("The debugger is not implemented under Mono and thus is not supported on your platform.");
                 }
             }
+            if (content.WaitForDebuggerToAttach)
+            {
+                var currentProcess = Process.GetCurrentProcess();
+                Console.WriteLine($"Waiting for debugger to attach ({currentProcess.MainModule.FileName} PID {currentProcess.Id}).  Press any key to continue without debugger.");
+                while (!Debugger.IsAttached) {
+                    if (Console.KeyAvailable) {
+                        break;
+                    }
+                    Thread.Sleep(100);
+                }
+            }
 
             // Print a startup message.            
             var buildStarted = DateTime.Now;