[glade] plugins/python/glade-python.c: add extra catalog paths to python path.

[Juan Pablo Ugarte <jpu src gnome org>]

commit 7bd059da4292281883f181b76809dc3b40d30706
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Wed Jun 10 21:08:33 2015 -0300

    plugins/python/glade-python.c: add extra catalog paths to python path.
    
    General cleanup to reduce Python 3 specific code.

 plugins/python/glade-python.c |  115 ++++++++++++++++++----------------------
 1 files changed, 52 insertions(+), 63 deletions(-)
---
diff --git a/plugins/python/glade-python.c b/plugins/python/glade-python.c
index 4ba8ac7..4111683 100644
--- a/plugins/python/glade-python.c
+++ b/plugins/python/glade-python.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2011 Juan Pablo Ugarte.
+ * Copyright (C) 2006-2015 Juan Pablo Ugarte.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as
@@ -27,47 +27,32 @@
 #include <gladeui/glade.h>
 
 #if PY_MAJOR_VERSION >= 3
-#define IS_PY3K
-#define PY_CHARTYPE wchar_t
-wchar_t *char_to_wchar(char *ch) {
-  wchar_t *res = NULL;
-  PyObject *pydecoded = PyUnicode_FromString(ch);
-
-  if (pydecoded) {
-    res = PyUnicode_AsWideCharString(pydecoded, NULL);
-    Py_DECREF(pydecoded);
-  }
-  return res;
-}
+
+#define WCHAR(str) L##str
+
+#define PY_STRING(str) WCHAR(str)
+#define STRING_FROM_PYSTR(pstr) PyUnicode_AsUTF8 (pstr)
+
 #else
+
 /* include bytesobject.h to map PyBytes_* to PyString_* */
 #include <bytesobject.h>
-#define PY_CHARTYPE char
+
+#define PY_STRING(str) str
+#define STRING_FROM_PYSTR(pstr) PyBytes_AsString (pstr)
+
 #endif
 
 static void
 python_init (void)
 {
-  const gchar *argv = g_get_prgname ();
-#ifdef IS_PY3K
-  wchar_t *argv_wide = NULL;
-#endif
-
   if (Py_IsInitialized ())
     return;
 
   Py_InitializeEx (0);
 
-#ifdef IS_PY3K
-  argv_wide = char_to_wchar((char *) argv);
-  if (!argv_wide) {
-    argv_wide = L"";
-  }
-  PySys_SetArgv (1, (wchar_t **) &argv_wide);
-#else
-  PySys_SetArgv (1, (char **) &argv);
-#endif
-
+  /* if argc is 0 an empty string is prepended to sys.path */
+  PySys_SetArgvEx (0, NULL, 0);
 }
 
 static void
@@ -107,17 +92,11 @@ glade_python_init_pygobject_check (gint req_major, gint req_minor, gint req_micr
 static gboolean
 glade_python_setup ()
 {
-  gchar *command;
+  GString *command;
   const gchar *module_path;
-#ifdef IS_PY3K
-  wchar_t *pkg_name = char_to_wchar((char *) PACKAGE_NAME);
-  if (!pkg_name) {
-    pkg_name = L"glade";
-  }
-  Py_SetProgramName (pkg_name);
-#else
-  Py_SetProgramName ((char *) PACKAGE_NAME);
-#endif
+  const GList *paths;
+
+  Py_SetProgramName (PY_STRING (PACKAGE_NAME));
 
   /* Initialize the Python interpreter */
   python_init ();
@@ -130,25 +109,25 @@ glade_python_setup ()
                                      PYGOBJECT_REQUIRED_MICRO);
   if (PyErr_Occurred ())
     {
-      PyObject *ptype, *pvalue, *ptraceback, *pvalue_repr;
-      char *pvalue_char;
+      PyObject *ptype, *pvalue, *ptraceback, *pstr;
+      char *pvalue_char = "";
 
       PyErr_Fetch (&ptype, &pvalue, &ptraceback);
-      pvalue_repr = PyObject_Str(pvalue);
-      if (!pvalue_repr) {
-        pvalue_char = "ERROR: Unable to get Python error data.\n";
-      } else {
-#ifdef IS_PY3K
-        pvalue_char = PyUnicode_AsUTF8(pvalue_repr);
-#else
-        pvalue_char = PyBytes_AsString(pvalue_repr);
-#endif
-      }
+      PyErr_NormalizeException (&ptype, &pvalue, &ptraceback);
+
+      if ((pstr = PyObject_Str (pvalue)))
+        pvalue_char = STRING_FROM_PYSTR (pstr);
+
       g_warning ("Unable to load pygobject module >= %d.%d.%d, "
                  "please make sure it is in python's path (sys.path). "
                  "(use PYTHONPATH env variable to specify non default paths)\n%s",
                  PYGOBJECT_REQUIRED_MAJOR, PYGOBJECT_REQUIRED_MINOR,
                  PYGOBJECT_REQUIRED_MICRO, pvalue_char);
+
+      Py_DecRef (ptype);
+      Py_DecRef (pvalue);
+      Py_DecRef (ptraceback);
+      Py_DecRef (pstr);
       PyErr_Clear ();
       Py_Finalize ();
 
@@ -157,24 +136,34 @@ glade_python_setup ()
 
   pyg_disable_warning_redirections ();
 
-  /* Set path */
+  /* Generate system path array */
+  command = g_string_new ("import sys; sys.path+=[");
+
+  /* GLADE_ENV_MODULE_PATH has priority */
   module_path = g_getenv (GLADE_ENV_MODULE_PATH);
-  if (module_path == NULL)
-    command = g_strdup_printf ("import sys; sys.path+=['%s'];\n",
-                               glade_app_get_modules_dir ());
-  else
-    command = g_strdup_printf ("import sys; sys.path+=['%s', '%s'];\n",
-                               module_path,
-                               glade_app_get_modules_dir ());
-
-  PyRun_SimpleString (command);
-  g_free (command);
+  if (module_path)
+    g_string_append_printf (command, "'%s', ", module_path);
+
+  /* Append modules directory */
+  g_string_append_printf (command, "'%s'", glade_app_get_modules_dir ());
   
+  /* Append extra paths (declared in the Preferences) */
+  for (paths = glade_catalog_get_extra_paths (); paths; paths = g_list_next (paths))
+    g_string_append_printf (command, ", '%s'", (gchar *) paths->data);
+
+  /* Close python statement */
+  g_string_append (command, "];\n");
+
+  /* Finally run statement in vm */
+  PyRun_SimpleString (command->str);
+
+  g_string_free (command, TRUE);
+
   return FALSE;
 }
 
 void
-glade_python_init (const gchar * name)
+glade_python_init (const gchar *name)
 {
   static gsize init = 0;
   gchar *import_sentence;