From 3e4132e660660b69d787df9c6ec2e9a18d712418 Mon Sep 17 00:00:00 2001
From: Edward d'Auvergne <edward@nmr-relax.com>
Date: Mon, 11 Jun 2018 08:52:34 +0200
Subject: [PATCH] modalMessageBox: Support for the runtime headless mode.

The caption, message, and additional text are instead output via SG_LOG().
---
 src/GUI/MessageBox.cxx | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/GUI/MessageBox.cxx b/src/GUI/MessageBox.cxx
index 04e59df6a..9730269c8 100644
--- a/src/GUI/MessageBox.cxx
+++ b/src/GUI/MessageBox.cxx
@@ -111,6 +111,15 @@ MessageBoxResult modalMessageBox(const std::string& caption,
     const std::string& msg,
     const std::string& moreText)
 {
+    // Headless mode.
+    if (globals->is_headless()) {
+        SG_LOG(SG_HEADLESS, SG_ALERT, "ModalMessageBox Caption: \"" << caption << "\"");
+        SG_LOG(SG_HEADLESS, SG_ALERT, "ModalMessageBox Message: \"" << msg << "\"");
+        if (!moreText.empty())
+            SG_LOG(SG_HEADLESS, SG_ALERT, "ModalMessageBox More text: \"" << moreText << "\"");
+        return MSG_BOX_OK;
+    }
+
     // prefer canvas
     if (isCanvasImplementationRegistered()) {
         SGPropertyNode_ptr args(new SGPropertyNode);