Defaulting of file paths to Documents is defined in just one place

src/FileNames.cpp

@@ -30,6 +30,7 @@ used throughout Audacity into this one place.
 #include "FileNames.h"
 #include "Internat.h"
 #include "PlatformCompatibility.h"
+#include "wxFileNameWrapper.h"
 
 #if defined(__WXMAC__) || defined(__WXGTK__)
 #include <dlfcn.h>
@@ -315,3 +316,23 @@ wxString FileNames::PathFromAddr(void *addr)
 
     return name.GetFullPath();
 }
+
+wxFileNameWrapper FileNames::DefaultToDocumentsFolder
+(const wxString &preference)
+{
+   wxFileNameWrapper result;
+   result.AssignHomeDir();
+
+#ifdef __WIN32__
+   result.SetPath(gPrefs->Read(
+      preference, result.GetPath(wxPATH_GET_VOLUME) + "\\Documents\\Audacity"));
+   // The path might not exist.
+   // There is no error if the path could not be created.  That's OK.
+   // The dialog that Audacity offers will allow the user to select a valid directory.
+   result.Mkdir(0755, wxPATH_MKDIR_FULL);
+#else
+   result.SetPath(gPrefs->Read( preference, result.GetPath() + "/Documents"));
+#endif
+
+   return result;
+}