Python catalog to support python widgets at runtime

import gobject
import gtk

class MyBox(gtk.HBox):
        __gtype_name__ = 'MyBox'
        
        def __init__(self):
                gtk.HBox.__init__(self)

<?xml version="1.0" encoding="UTF-8"?>
<glade-catalog name="pythonplugin" library="gladepython" domain="glade-3" depends="gtk+">
  <init-function>glade_python_init</init-function>
  <glade-widget-classes>
    <glade-widget-class title="MyBox" name="MyBox" generic-name="mybox"/>
  </glade-widget-classes>
	
  <glade-widget-group name="python" title="Python">
    <glade-widget-class-ref name="MyBox"/>
  </glade-widget-group>
</glade-catalog>

Index: m4/python.m4
===================================================================
--- m4/python.m4	(revision 1832)
+++ m4/python.m4	(working copy)
@@ -1,7 +1,7 @@
 ## this one is commonly used with AM_PATH_PYTHONDIR ...
 dnl AM_CHECK_PYMOD(MODNAME [,SYMBOL [,ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]]])
 dnl Check if a module containing a given symbol is visible to python.
-AC_DEFUN([AM_CHECK_PYMOD],
+AC_DEFUN(AM_CHECK_PYMOD,
 [AC_REQUIRE([AM_PATH_PYTHON])
 py_mod_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
 AC_MSG_CHECKING(for ifelse([$2],[],,[$2 in ])python module $1)
@@ -60,65 +60,29 @@
 $2])
 CPPFLAGS="$save_CPPFLAGS"
 ])
-## this one is commonly used with AM_PATH_PYTHONDIR ...
-dnl AM_CHECK_PYMOD(MODNAME [,SYMBOL [,ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]]])
-dnl Check if a module containing a given symbol is visible to python.
-AC_DEFUN([AM_CHECK_PYMOD],
-[AC_REQUIRE([AM_PATH_PYTHON])
-py_mod_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
-AC_MSG_CHECKING(for ifelse([$2],[],,[$2 in ])python module $1)
-AC_CACHE_VAL(py_cv_mod_$py_mod_var, [
-ifelse([$2],[], [prog="
-import sys
-try:
-        import $1
-except ImportError:
-        sys.exit(1)
-except:
-        sys.exit(0)
-sys.exit(0)"], [prog="
-import $1
-$1.$2"])
-if $PYTHON -c "$prog" 1>&AC_FD_CC 2>&AC_FD_CC
-  then
-    eval "py_cv_mod_$py_mod_var=yes"
-  else
-    eval "py_cv_mod_$py_mod_var=no"
-  fi
-])
-py_val=`eval "echo \`echo '$py_cv_mod_'$py_mod_var\`"`
-if test "x$py_val" != xno; then
-  AC_MSG_RESULT(yes)
-  ifelse([$3], [],, [$3
-])dnl
-else
-  AC_MSG_RESULT(no)
-  ifelse([$4], [],, [$4
-])dnl
-fi
-])
 
-dnl a macro to check for ability to create python extensions
-dnl  AM_CHECK_PYTHON_HEADERS([ACTION-IF-POSSIBLE], [ACTION-IF-NOT-POSSIBLE])
-dnl function also defines PYTHON_INCLUDES
-AC_DEFUN([AM_CHECK_PYTHON_HEADERS],
-[AC_REQUIRE([AM_PATH_PYTHON])
-AC_MSG_CHECKING(for headers required to compile python extensions)
-dnl deduce PYTHON_INCLUDES
-py_prefix=`$PYTHON -c "import sys; print sys.prefix"`
+dnl a macro to check for ability to embed python
+dnl  AM_CHECK_PYTHON_LIBS([ACTION-IF-POSSIBLE], [ACTION-IF-NOT-POSSIBLE])
+dnl function also defines PYTHON_LIBS
+AC_DEFUN([AM_CHECK_PYTHON_LIBS],
+[AC_REQUIRE([AM_CHECK_PYTHON_HEADERS])
+AC_MSG_CHECKING(for libraries required to embed python)
+dnl deduce PYTHON_LIBS
 py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
-PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
-if test "$py_prefix" != "$py_exec_prefix"; then
-  PYTHON_INCLUDES="$PYTHON_INCLUDES -I${py_exec_prefix}/include/python${PYTHON_VERSION}"
+if test "x$PYTHON_LIBS" == x; then
+	PYTHON_LIBS="-L${py_prefix}/lib -lpython${PYTHON_VERSION}"
 fi
-AC_SUBST(PYTHON_INCLUDES)
+if test "x$PYTHON_LIB_LOC" == x; then
+	PYTHON_LIB_LOC="${py_prefix}/lib" 
+fi
+AC_SUBST(PYTHON_LIBS)
+AC_SUBST(PYTHON_LIB_LOC)
 dnl check if the headers exist:
-save_CPPFLAGS="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS $PYTHON_INCLUDES"
-AC_TRY_CPP([#include <Python.h>],dnl
-[AC_MSG_RESULT(found)
-$1],dnl
-[AC_MSG_RESULT(not found)
-$2])
-CPPFLAGS="$save_CPPFLAGS"
+save_LIBS="$LIBS"
+LIBS="$LIBS $PYTHON_LIBS"
+AC_TRY_LINK_FUNC(Py_Initialize, dnl
+         [LIBS="$save_LIBS"; AC_MSG_RESULT(yes); $1], dnl
+         [LIBS="$save_LIBS"; AC_MSG_RESULT(no); $2])
+
 ])
+
Index: plugins/python/Makefile.am
===================================================================
--- plugins/python/Makefile.am	(revision 0)
+++ plugins/python/Makefile.am	(revision 0)
@@ -0,0 +1,28 @@
+## Process this file with automake to produce Makefile.in
+
+libgladeui = $(top_builddir)/gladeui/libgladeui-1.la
+
+
+# libgladepython
+
+gladepython_LTLIBRARIES = libgladepython.la
+gladepythondir = $(pkglibdir)/modules
+
+libgladepython_la_SOURCES = glade-python.c
+libgladepython_la_CPPFLAGS = $(AM_CPPFLAGS)
+libgladepython_la_CFLAGS = \
+        -DG_LOG_DOMAIN=\"GladeUI-PYTHON\" \
+	-I$(top_srcdir)                  \
+	-I$(top_builddir)                \
+	$(PYTHON_INCLUDES)      \
+	$(PYGTK_CFLAGS)            \
+	$(GTK_CFLAGS)                    \
+	$(PLUGINS_WARN_CFLAGS)           \
+	$(AM_CPPFLAGS)
+libgladepython_la_LDFLAGS = -module -avoid-version $(PYTHON_LIBS) $(AM_LDFLAGS)
+libgladepython_la_LIBADD = $(libgladeui) $(PYTHON_LIBS)
+
+if PLATFORM_WIN32
+libgladepython_la_LDFLAGS += -no-undefined
+endif
+
Index: plugins/python/glade-python.c
===================================================================
--- plugins/python/glade-python.c	(revision 0)
+++ plugins/python/glade-python.c	(revision 0)
@@ -0,0 +1,127 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * Copyright (C) 2006-2008 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
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Authors:
+ *   Juan Pablo Ugarte <[email protected]>
+ */
+
+#include <config.h>
+
+#include <gladeui/glade.h>
+
+#include <Python.h>
+#include <pygobject.h>
+
+static void
+python_init (void)
+{
+	char *argv[1];
+	
+	if (Py_IsInitialized ()) return;
+
+	Py_InitializeEx (0);
+
+	argv[0] = g_get_prgname ();
+	
+	PySys_SetArgv (1, argv);
+}
+
+static void
+glade_python_init_pygtk_check (gint req_major, gint req_minor, gint req_micro)
+{
+	PyObject *gobject, *mdict, *version;
+	int found_major, found_minor, found_micro;
+	
+	init_pygobject();
+	
+	gobject = PyImport_ImportModule("gobject");
+	mdict = PyModule_GetDict(gobject);
+        version = PyDict_GetItemString(mdict, "pygtk_version");
+	if (!version)
+	{
+		PyErr_SetString(PyExc_ImportError, "PyGObject version too old");
+		return;
+	}
+	if (!PyArg_ParseTuple(version, "iii", &found_major, &found_minor, &found_micro))
+		return;
+	if (req_major != found_major || req_minor >  found_minor ||
+	    (req_minor == found_minor && req_micro > found_micro))
+	{
+		PyErr_Format(PyExc_ImportError, 
+                     "PyGObject version mismatch, %d.%d.%d is required, "
+                     "found %d.%d.%d.", req_major, req_minor, req_micro,
+                     found_major, found_minor, found_micro);
+		return;
+	}
+}
+
+static void
+glade_python_setup ()
+{
+	gchar *command;
+	
+    	Py_SetProgramName (PACKAGE_NAME);
+	
+	/* Initialize the Python interpreter */
+	python_init ();
+	
+	/* Check and init pygobject >= 2.12.0 */
+	PyErr_Clear ();	
+	glade_python_init_pygtk_check (PYGTK_REQUIRED_MAJOR, PYGTK_REQUIRED_MINOR, PYGTK_REQUIRED_MICRO);
+	if (PyErr_Occurred ())
+	{
+		PyObject *ptype, *pvalue, *ptraceback;
+		PyErr_Fetch(&ptype, &pvalue, &ptraceback);
+		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",
+			   PYGTK_REQUIRED_MAJOR, PYGTK_REQUIRED_MINOR, PYGTK_REQUIRED_MICRO,
+			   PyString_AsString (pvalue));
+		PyErr_Clear ();
+		Py_Finalize ();
+		return;
+	}
+	
+	pyg_disable_warning_redirections ();
+
+	/* Set path */
+	command = g_strdup_printf ("import sys; sys.path+=['.', '%s', '%s'];\n",
+				   g_getenv (GLADE_ENV_CATALOG_PATH),
+				   glade_app_get_modules_dir ());
+	PyRun_SimpleString (command);
+	g_free (command);
+}
+
+
+void
+glade_python_init (const gchar *name)
+{
+	static gboolean init = TRUE;
+	gchar *import_sentence;
+	
+	if (init)
+	{
+		glade_python_setup ();
+		init = FALSE;
+	}
+	
+	/* Yeah, we use the catalog name as the library */
+	import_sentence = g_strdup_printf ("import %s;", name);
+	PyRun_SimpleString (import_sentence);
+	g_free (import_sentence);
+}
Index: plugins/gnome/glade-gnome.c
===================================================================
--- plugins/gnome/glade-gnome.c	(revision 1832)
+++ plugins/gnome/glade-gnome.c	(working copy)
@@ -41,7 +41,7 @@
 
 /* Catalog init function */
 void
-glade_gnomeui_init (void)
+glade_gnomeui_init (const gchar *name)
 {
 	gchar *argv[2] = {"glade-3", NULL};
 	GtkStockItem items [] = {
Index: plugins/Makefile.am
===================================================================
--- plugins/Makefile.am	(revision 1832)
+++ plugins/Makefile.am	(working copy)
@@ -5,3 +5,7 @@
 if BUILD_GNOME
 SUBDIRS += gnome
 endif
+
+if BUILD_PYTHON
+SUBDIRS += python
+endif
Index: configure.ac
===================================================================
--- configure.ac	(revision 1832)
+++ configure.ac	(working copy)
@@ -145,6 +145,33 @@
 
 AM_CONDITIONAL(BUILD_GNOME, test x"$have_gnome" = "xyes")
 
+dnl ================================================================
+dnl Python for optional python dev libs
+dnl ================================================================
+AC_ARG_ENABLE(python,
+    AS_HELP_STRING([--disable-python], [disable python catalog]),
+    check_python=$enableval, check_python=yes)
+
+if test x"$check_python" = x"yes"; then
+  PYGTK_REQUIRED_MAJOR=2
+  PYGTK_REQUIRED_MINOR=10
+  PYGTK_REQUIRED_MICRO=0
+  AM_CHECK_PYTHON_HEADERS(, [AC_MSG_ERROR(could not find Python headers)])
+  AM_CHECK_PYTHON_LIBS(, [AC_MSG_ERROR(could not find Python lib)])
+  PKG_CHECK_MODULES(PYGTK, [pygtk-2.0 >= 2.10.0], [have_python=yes],[have_python=no])
+
+  AC_DEFINE_UNQUOTED(PYGTK_REQUIRED_MAJOR, $PYGTK_REQUIRED_MAJOR, Pygtk mayor version required)
+  AC_DEFINE_UNQUOTED(PYGTK_REQUIRED_MINOR, $PYGTK_REQUIRED_MINOR, Pygtk minor version required)
+  AC_DEFINE_UNQUOTED(PYGTK_REQUIRED_MICRO, $PYGTK_REQUIRED_MICRO, Pygtk micro version required)
+
+  AC_SUBST(PYGTK_LIBS)
+  AC_SUBST(PYGTK_CFLAGS)
+else
+  have_python=no
+fi
+
+AM_CONDITIONAL(BUILD_PYTHON, test x"$have_python" = "xyes")
+
 # ==================================================================
 # Glade User Manual (requires gnome-doc-utils)
 # ==================================================================
@@ -218,6 +245,7 @@
 plugins/gnome/icons/Makefile
 plugins/gnome/icons/16x16/Makefile
 plugins/gnome/icons/22x22/Makefile
+plugins/python/Makefile
 po/Makefile.in
 doc/Makefile
 doc/version.xml
@@ -234,4 +262,5 @@
 	Compiler:		 ${CC}
 	GTK+ UNIX Print Widgets: ${have_unix_print}
 	GNOME UI Widgets:	 ${have_gnome}
+	PYTHON Widgets support:	 ${have_python}
 "
Index: gladeui/glade-catalog.c
===================================================================
--- gladeui/glade-catalog.c	(revision 1832)
+++ gladeui/glade-catalog.c	(working copy)
@@ -33,7 +33,7 @@
 #include <glib.h>
 #include <glib/gi18n-lib.h>
 
-typedef void   (*GladeCatalogInitFunc) (void);
+typedef void   (*GladeCatalogInitFunc) (const gchar *name);
 
 struct _GladeCatalog
 {
@@ -535,7 +535,7 @@
 	{
 		catalog = l->data;
 		if (catalog->init_function)
-			catalog->init_function ();
+			catalog->init_function (catalog->name);
 	}
 	
 	for (l = catalogs; l; l = l->next)