Resolved issue #778. Calling Valentina with "-h" option opens information

dialog instead of writing to console.
(grafted from 4fb29d9b4e5441c43704005e4776f87d548673e7)

--HG--
branch : develop

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.

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

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");
 

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
 {

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;