From 0a66db718474035b7d1c27afa1b35d0bf218d583 Mon Sep 17 00:00:00 2001
From: Roman Telezhynskyi <kroluku@gmail.com>
Date: Sun, 10 Dec 2017 13:17:04 +0200
Subject: [PATCH] Resolved issue #778. Calling Valentina with "-h" option opens
 information dialog instead of writing to console. (grafted from
 4fb29d9b4e5441c43704005e4776f87d548673e7)

--HG--
branch : develop
---
 ChangeLog.txt                           |  1 +
 src/app/tape/main.cpp                   |  4 ++++
 src/app/valentina/main.cpp              |  4 ++++
 src/libs/vmisc/vabstractapplication.cpp | 18 ++++++++++++++++++
 src/libs/vmisc/vabstractapplication.h   |  4 ++++
 5 files changed, 31 insertions(+)

diff --git a/ChangeLog.txt b/ChangeLog.txt
index 645493bce..5ea552860 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -73,6 +73,7 @@
 - Fix issue. Curves look too wavy.
 - [#773] Tool Point intersection curve and axis cannot find desired intersection point.
 - [#776] Valentina cannot recognize translated functions.
+- [#778] Calling Valentina with "-h" option opens information dialog instead of writing to console.
 
 # Version 0.5.0 May 9, 2017
 - [#581] User can now filter input lists by keyword in function wizard.
diff --git a/src/app/tape/main.cpp b/src/app/tape/main.cpp
index 1b5899552..03f8781c6 100644
--- a/src/app/tape/main.cpp
+++ b/src/app/tape/main.cpp
@@ -43,6 +43,10 @@ int main(int argc, char *argv[])
 
     QT_REQUIRE_VERSION(argc, argv, "5.2.0")
 
+#if defined(Q_OS_WIN)
+    VAbstractApplication::WinAttachConsole();
+#endif
+
 #ifndef Q_OS_MAC // supports natively
     InitHighDpiScaling(argc, argv);
 #endif //Q_OS_MAC
diff --git a/src/app/valentina/main.cpp b/src/app/valentina/main.cpp
index db60e26dc..d9201f3b6 100644
--- a/src/app/valentina/main.cpp
+++ b/src/app/valentina/main.cpp
@@ -48,6 +48,10 @@ int main(int argc, char *argv[])
 
     QT_REQUIRE_VERSION(argc, argv, "5.2.0")
 
+#if defined(Q_OS_WIN)
+    VAbstractApplication::WinAttachConsole();
+#endif
+
     // Need to internally move a node inside a piece main path
     qRegisterMetaTypeStreamOperators<VPieceNode>("VPieceNode");
 
diff --git a/src/libs/vmisc/vabstractapplication.cpp b/src/libs/vmisc/vabstractapplication.cpp
index d621a0794..8ca124e7d 100644
--- a/src/libs/vmisc/vabstractapplication.cpp
+++ b/src/libs/vmisc/vabstractapplication.cpp
@@ -234,6 +234,24 @@ QUndoStack *VAbstractApplication::getUndoStack() const
     return undoStack;
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+#if defined(Q_OS_WIN)
+void VAbstractApplication::WinAttachConsole()
+{
+    /* Windows does not really support dual mode applications.
+     * To see console output we need to attach console.
+     * For case of using pipeline we check std output handler.
+     * Original idea: https://stackoverflow.com/a/41701133/3045403
+     */
+    auto stdout_type = GetFileType(GetStdHandle(STD_OUTPUT_HANDLE));
+    if (stdout_type == FILE_TYPE_UNKNOWN && AttachConsole(ATTACH_PARENT_PROCESS))
+    {
+        freopen("CONOUT$", "w", stdout);
+        freopen("CONOUT$", "w", stderr);
+    }
+}
+#endif
+
 //---------------------------------------------------------------------------------------------------------------------
 Unit VAbstractApplication::patternUnit() const
 {
diff --git a/src/libs/vmisc/vabstractapplication.h b/src/libs/vmisc/vabstractapplication.h
index b249afdf6..226ae258d 100644
--- a/src/libs/vmisc/vabstractapplication.h
+++ b/src/libs/vmisc/vabstractapplication.h
@@ -111,6 +111,10 @@ public:
     QString         GetPPath() const;
     void            SetPPath(const QString &value);
 
+#if defined(Q_OS_WIN)
+    static void WinAttachConsole();
+#endif
+
 protected:
     QUndoStack         *undoStack;