Add wxStandardPaths::ConfigFileConv enum for clarity and safety

Use an enum instead of type-unsafe "int" for the second parameter of the
recently added wxStandardPaths::MakeConfigFileName().

This also avoids unnatural dependency of wxStandardPaths on
wxCONFIG_USE_SUBDIR constant defined in a higher level wxFileConfig class.

No real changes, but just make things a bit more robust and hopefully more
clear.

include/wx/msw/stdpaths.h

@@ -29,7 +29,8 @@ public:
     virtual wxString GetUserLocalDataDir() const wxOVERRIDE;
     virtual wxString GetPluginsDir() const wxOVERRIDE;
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
-    virtual wxString MakeConfigFileName(const wxString& basename, int style) const wxOVERRIDE;
+    virtual wxString MakeConfigFileName(const wxString& basename,
+                                        ConfigFileConv conv) const wxOVERRIDE;
 
 
     // MSW-specific methods

include/wx/osx/cocoa/stdpaths.h

@@ -32,7 +32,8 @@ public:
     GetLocalizedResourcesDir(const wxString& lang,
                              ResourceCat category = ResourceCat_None) const wxOVERRIDE;
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
-    virtual wxString MakeConfigFileName(const wxString& basename, int style) const wxOVERRIDE;
+    virtual wxString MakeConfigFileName(const wxString& basename,
+                                        ConfigFileConv conv) const wxOVERRIDE;
 
 protected:
     // Ctor is protected, use wxStandardPaths::Get() instead of instantiating

include/wx/stdpaths.h

@@ -67,6 +67,14 @@ public:
         FileLayout_XDG          // Recommended: use XDG specification.
     };
 
+    // Naming convention for the config files under Unix.
+    enum ConfigFileConv
+    {
+        ConfigFileConv_Dot,     // Classic Unix dot-file convention.
+        ConfigFileConv_Ext      // Use .conf extension.
+    };
+
+
     // return the global standard paths object
     static wxStandardPaths& Get();
 
@@ -162,7 +170,9 @@ public:
 
     virtual wxString GetUserDir(Dir userDir) const;
 
-    virtual wxString MakeConfigFileName(const wxString& basename, int style) const = 0;
+    virtual wxString
+    MakeConfigFileName(const wxString& basename,
+                       ConfigFileConv conv = ConfigFileConv_Ext) const = 0;
 
     // virtual dtor for the base class
     virtual ~wxStandardPathsBase();

include/wx/unix/stdpaths.h

@@ -49,7 +49,8 @@ public:
 #ifndef __VMS
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
 #endif
-    virtual wxString MakeConfigFileName(const wxString& basename, int style) const wxOVERRIDE;
+    virtual wxString MakeConfigFileName(const wxString& basename,
+                                        ConfigFileConv conv) const wxOVERRIDE;
 
 protected:
     // Ctor is protected, use wxStandardPaths::Get() instead of instantiating

interface/wx/stdpaths.h

@@ -166,6 +166,35 @@ public:
         FileLayout_XDG
     };
 
+    /**
+        Possible values for MakeConfigFileName() naming convention argument.
+
+        The values in this enum are only used under Unix and only when using
+        the classic Unix convention for file layout, in XDG mode, XDG naming
+        convention is used unconditionally.
+
+        @since 3.1.1
+     */
+    enum ConfigFileConv
+    {
+        /**
+            Use the class Unix dot-file convention.
+
+            Prepend the dot to the file base name.
+
+            This value is ignored when in XDG mode, where MakeConfigFileName()
+            always behaves as if ConfigFileConv_Ext was specified.
+        */
+        ConfigFileConv_Dot,
+
+        /**
+            Use @c .conf extension for the file names.
+
+            This convention is always used in XDG mode.
+         */
+        ConfigFileConv_Ext
+    };
+
     /**
         MSW-specific function undoing the effect of IgnoreAppSubDir() calls.
 
@@ -500,16 +529,22 @@ public:
     FileLayout GetFileLayout() const;
 
     /**
-        Return the file name which would be used by wxFileConfig as local,
-        user-specific, file if it were constructed with @a basename.
+        Return the file name which would be used by wxFileConfig if it were
+        constructed with @a basename.
 
-        @a style has the same meaning as in @ref wxConfigBase::wxConfigBase "wxConfig constructor"
-        and can contain any combination of styles but only wxCONFIG_USE_SUBDIR bit is
-        examined by this function.
+        @a conv is used to construct the name of the file under Unix and only
+        matters when using the class file layout, i.e. if SetFileLayout() had
+        @e not been called with @c FileLayout_XDG argument. In this case, this
+        argument is used to determine whether to use an extension or a leading
+        dot. When following XDG specification, the function always appends the
+        extension, regardless of @a conv value. Finally, this argument is not
+        used at all under non-Unix platforms.
 
-        Notice that this function cannot be used if @a basename is already a full path name.
+        @since 3.1.1
     */
-    virtual wxString MakeConfigFileName(const wxString& basename, int style) const;
+    virtual wxString
+    MakeConfigFileName(const wxString& basename,
+                       ConfigFileConv conv = ConfigFileConv_Ext) const;
 
 protected:
     /**

src/common/fileconf.cpp

@@ -266,14 +266,28 @@ wxString wxFileConfig::GetLocalDir(int style)
 
 wxFileName wxFileConfig::GetGlobalFile(const wxString& szFile)
 {
-    wxFileName fn(GetGlobalDir(), wxStandardPaths::Get().MakeConfigFileName(szFile, wxCONFIG_USE_SUBDIR));
-    return fn;
+    wxStandardPathsBase& stdp = wxStandardPaths::Get();
+
+    return wxFileName(GetGlobalDir(), stdp.MakeConfigFileName(szFile));
 }
 
 wxFileName wxFileConfig::GetLocalFile(const wxString& szFile, int style)
 {
-    wxFileName fn(GetLocalDir(style), wxStandardPaths::Get().MakeConfigFileName(szFile, style));
-    return fn;
+    wxStandardPathsBase& stdp = wxStandardPaths::Get();
+
+    // If the config file is located in a subdirectory, we always use an
+    // extension for it, but we use just the leading dot if it is located
+    // directly in the home directory. Note that if wxStandardPaths is
+    // configured to follow XDG specification, all config files go to a
+    // subdirectory of XDG_CONFIG_HOME anyhow, so in this case we'll still end
+    // up using the extension even if wxCONFIG_USE_SUBDIR is not set, but this
+    // is the correct and expected (if a little confusing) behaviour.
+    const wxStandardPaths::ConfigFileConv
+        conv = style & wxCONFIG_USE_SUBDIR
+                ? wxStandardPaths::ConfigFileConv_Ext
+                : wxStandardPaths::ConfigFileConv_Dot;
+
+    return wxFileName(GetLocalDir(style), stdp.MakeConfigFileName(szFile, conv));
 }
 
 // ----------------------------------------------------------------------------

src/msw/stdpaths.cpp

@@ -370,7 +370,9 @@ wxString wxStandardPaths::GetPluginsDir() const
 }
 
 
-wxString wxStandardPaths::MakeConfigFileName(const wxString& basename, int WXUNUSED(style)) const
+wxString
+wxStandardPaths::MakeConfigFileName(const wxString& basename,
+                                    ConfigFileConv WXUNUSED(conv)) const
 {
     wxFileName fn(wxEmptyString, basename);
     fn.SetExt(wxT("ini"));

src/osx/cocoa/stdpaths.mm

@@ -130,7 +130,9 @@ wxString wxStandardPaths::GetUserDir(Dir userDir) const
     return GetFMDirectory(dirType, NSUserDomainMask);
 }
 
-wxString wxStandardPaths::MakeConfigFileName(const wxString& basename, int WXUNUSED(style)) const
+wxString
+wxStandardPaths::MakeConfigFileName(const wxString& basename,
+                                    ConfigFileConv WXUNUSED(conv)) const
 {
     wxFileName fn(wxEmptyString, basename);
     fn.SetName(fn.GetName() + wxT(" Preferences"));

src/unix/stdpaths.cpp

@@ -33,7 +33,6 @@
     #include "wx/utils.h"
 #endif //WX_PRECOMP
 
-#include "wx/fileconf.h"
 #include "wx/filename.h"
 #include "wx/log.h"
 #include "wx/textfile.h"
@@ -334,30 +333,38 @@ wxString wxStandardPaths::GetUserDir(Dir userDir) const
 
 #endif // __VMS/!__VMS
 
-wxString wxStandardPaths::MakeConfigFileName(const wxString& basename, int style) const
+wxString
+wxStandardPaths::MakeConfigFileName(const wxString& basename,
+                                    ConfigFileConv conv) const
 {
     wxFileName fn(wxEmptyString, basename);
+
+    bool addExt = false;
+
     switch ( GetFileLayout() )
     {
         case FileLayout_Classic:
-            if ( !(style & wxCONFIG_USE_SUBDIR) )
+            switch ( conv )
             {
-                // The standard convention is to not use the extensions for the
-                // config files in the home directory and just prepend a dot to
-                // them instead.
-                fn.SetName(wxT('.') + fn.GetName());
-                break;
+                case ConfigFileConv_Dot:
+                    fn.SetName(wxT('.') + fn.GetName());
+                    break;
+
+                case ConfigFileConv_Ext:
+                    addExt = true;
+                    break;
             }
-            //else: fall through to add the extension
-            wxFALLTHROUGH;
+            break;
 
         case FileLayout_XDG:
-            // We always use the extension for the config files when using XDG
-            // layout as they don't go to the home directory anyhow.
-            fn.SetExt(wxS("conf"));
+            // Dot files are never used in XDG mode.
+            addExt = true;
             break;
     }
 
+    if ( addExt )
+        fn.SetExt(wxS("conf"));
+
     return fn.GetFullName();
 }