rpi plugins fix + paths enhancements #94

Store the full relative path to found `.rpi` plugins, relative to the
standard Plugins directory, as specified by wxWidgets.

This fixes the problem of plugins being in a subdirectory while only the
basename was stored, making the plugins unusable.

This is done by using `wxFileName::GetFullPath()` instead of
`wxFileName::GetFullName()` with a relative filename instance.

Make a `GetPluginsDir()` method on the app class to simplify getting
this directory, and for possible future overrides.

Also make some minor, functionally equivalent changes to
`get_config_path()` in `wxvbam.cpp`:

- use the new `GetPluginsDir()` method for the plugins directory when
  building the config file search path

- print the XdgConfigDir on all platforms, since the function works on
  all platforms

- make a `add_nonstandard_path` macro which duplicates the `add_path`
  macro for wxWidgets standard paths but for any arbitrary string path

- use `wxFileName` methods to make the XDG config directory path instead
  of string concatenation

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

src/wx/guiinit.cpp

@@ -1775,8 +1775,8 @@ public:
         ch->Clear();
         ch->Append(_("None"));
         plugins.clear();
-        const wxString& plpath = wxStandardPaths::Get().GetPluginsDir();
-        wxDir::GetAllFiles(plpath, &plugins, wxT("*.rpi"));
+        const wxString plpath = wxGetApp().GetPluginsDir();
+        wxDir::GetAllFiles(plpath, &plugins, wxT("*.rpi"), wxDIR_FILES | wxDIR_DIRS);
 
         for (int i = 0; i < plugins.size(); i++) {
             wxDynamicLibrary dl(plugins[i], wxDL_VERBATIM | wxDL_NOW);
@@ -1798,7 +1798,7 @@ public:
                 s += wxT(": ");
                 s += wxString(rpi->Name, wxConvUTF8, sizeof(rpi->Name));
                 fn.MakeRelativeTo(plpath);
-                plugins[i] = fn.GetFullName();
+                plugins[i] = fn.GetFullPath();
                 ch->Append(s);
 
                 if (plugins[i] == gopts.filter_plugin)

src/wx/panel.cpp

@@ -1336,7 +1336,7 @@ DrawingPanelBase::DrawingPanelBase(int _width, int _height)
                 break;
 
             wxFileName fpn(gopts.filter_plugin);
-            fpn.MakeAbsolute(wxStandardPaths::Get().GetPluginsDir());
+            fpn.MakeAbsolute(wxGetApp().GetPluginsDir());
 
             if (!filt_plugin.Load(fpn.GetFullPath(), wxDL_VERBATIM | wxDL_NOW))
                 break;

src/wx/wxvbam.cpp

@@ -48,6 +48,14 @@ static void get_config_path(wxPathList& path, bool exists = true)
         if ((wxDirExists(s) && wxIsWritable(s)) || ((!exists || !wxDirExists(s)) && parent.IsDirWritable())) \
             path.Add(s);                                                                                     \
     } while (0)
+#define add_nonstandard_path(p)                                                                                          \
+    do {                                                                                                     \
+        const wxString& s = p;                                                                          \
+        wxFileName parent = wxFileName::DirName(s + wxT("//.."));                                            \
+        parent.MakeAbsolute();                                                                               \
+        if ((wxDirExists(s) && wxIsWritable(s)) || ((!exists || !wxDirExists(s)) && parent.IsDirWritable())) \
+            path.Add(s);                                                                                     \
+    } while (0)
 
     static bool debug_dumped = false;
 
@@ -58,10 +66,8 @@ static void get_config_path(wxPathList& path, bool exists = true)
         wxLogDebug(wxT("GetResourcesDir(): %s"), stdp.GetResourcesDir().mb_str());
         wxLogDebug(wxT("GetDataDir(): %s"), stdp.GetDataDir().mb_str());
         wxLogDebug(wxT("GetLocalDataDir(): %s"), stdp.GetLocalDataDir().mb_str());
-        wxLogDebug(wxT("GetPluginsDir(): %s"), stdp.GetPluginsDir().mb_str());
-#if defined(__WXGTK__)
+        wxLogDebug(wxT("plugins_dir: %s"), wxGetApp().GetPluginsDir().mb_str());
         wxLogDebug(wxT("XdgConfigDir: %s"), get_xdg_user_config_home() + current_app_name);
-#endif
         debug_dumped = true;
     }
 
@@ -74,12 +80,16 @@ static void get_config_path(wxPathList& path, bool exists = true)
     wxString new_config(get_xdg_user_config_home());
     if (!wxDirExists(old_config) && wxIsWritable(new_config))
     {
-        path.Add(new_config + current_app_name);
+        wxFileName new_path(new_config, wxEmptyString);
+        new_path.AppendDir(current_app_name);
+        new_path.MakeAbsolute();
+
+        add_nonstandard_path(new_path.GetFullPath());
     }
     else
     {
 	// config is in $HOME/.vbam/vbam.conf
-	path.Add(old_config);
+	add_nonstandard_path(old_config);
     }
 #endif
 
@@ -90,7 +100,7 @@ static void get_config_path(wxPathList& path, bool exists = true)
     add_path(GetResourcesDir());
     add_path(GetDataDir());
     add_path(GetLocalDataDir());
-    add_path(GetPluginsDir());
+    add_nonstandard_path(wxGetApp().GetPluginsDir());
 }
 
 static void tack_full_path(wxString& s, const wxString& app = wxEmptyString)
@@ -103,6 +113,11 @@ static void tack_full_path(wxString& s, const wxString& app = wxEmptyString)
         s += wxT("\n\t") + full_config_path[i] + app;
 }
 
+const wxString wxvbamApp::GetPluginsDir()
+{
+    return wxStandardPaths::Get().GetPluginsDir();
+}
+
 wxString wxvbamApp::GetConfigurationPath()
 {
 #if defined(__WXMSW__) || defined(__APPLE__)

src/wx/wxvbam.h

@@ -87,6 +87,7 @@ public:
     virtual void OnInitCmdLine(wxCmdLineParser&);
     virtual bool OnCmdLineParsed(wxCmdLineParser&);
     wxString GetConfigurationPath();
+    const wxString GetPluginsDir();
     wxString GetAbsolutePath(wxString path);
     // name of a file to load at earliest opportunity
     wxString pending_load;