From 7d72a8c36a872113583e6db85707a8f17f3d3927 Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Thu, 14 Jun 2012 15:06:23 +0200
Subject: [PATCH] Show command line options as dialog when opened from debug
 window

On Linux/Mac the command-line options were printed to stderr when the button
was pressed in the debug window, resulting in confusion. This is fixed
in this commit by adding a separate method.
---
 src/qt/bitcoin.cpp |  2 +-
 src/qt/guiutil.cpp | 16 +++++++++++-----
 src/qt/guiutil.h   |  6 +++++-
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 8c8c73f065..b4e751077e 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -212,7 +212,7 @@ int main(int argc, char *argv[])
     if (mapArgs.count("-?") || mapArgs.count("--help"))
     {
         GUIUtil::HelpMessageBox help;
-        help.exec();
+        help.showOrPrint();
         return 1;
     }
 
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index a8c2328853..50ed2eed04 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -441,15 +441,21 @@ HelpMessageBox::HelpMessageBox(QWidget *parent) :
     setDetailedText(coreOptions + "\n" + uiOptions);
 }
 
-void HelpMessageBox::exec()
+void HelpMessageBox::printToConsole()
 {
-#if defined(WIN32)
-    // On windows, show a message box, as there is no stderr in windowed applications
-    QMessageBox::exec();
-#else
     // On other operating systems, the expected action is to print the message to the console.
     QString strUsage = header + "\n" + coreOptions + "\n" + uiOptions;
     fprintf(stderr, "%s", strUsage.toStdString().c_str());
+}
+
+void HelpMessageBox::showOrPrint()
+{
+#if defined(WIN32)
+        // On windows, show a message box, as there is no stderr/stdout in windowed applications
+        exec();
+#else
+        // On other operating systems, print help text to console
+        printToConsole();
 #endif
 }
 
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index ca06348519..0240695505 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -103,7 +103,11 @@ namespace GUIUtil
     public:
         HelpMessageBox(QWidget *parent = 0);
 
-        void exec();
+        /** Show message box or print help message to standard output, based on operating system. */
+        void showOrPrint();
+
+        /** Print help message to console */
+        void printToConsole();
 
     private:
         QString header;