Provisions for loading python modules from the source tree.

* python/Makefile.am (EXTRA_DIST): Add usercustomize.py
* python/usercustomize.py: New file.
* python/libmu_py/Makefile.am (pythonexec_LTLIBRARIES): Remove.
* python/mailutils/Makefile.am (pythonexec_LTLIBRARIES): New
variable (moved from ../libmu_py/Makefile.am)
* python/libmu_py/c_api.c: Move ...
* python/mailutils/c_api.c: ... there

@@ -15,4 +15,5 @@
 ## along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. 
 
 SUBDIRS = libmu_py mailutils
+EXTRA_DIST=usercustomize.py
 

@@ -60,8 +60,3 @@ libmu_py_la_LIBADD = $(PYTHON_LIBS) @MU_COMMON_LIBRARIES@ \
  @MU_AUTHLIBS@\
  ${MU_LIB_MAILUTILS}
 
-pythonexecdir=@PYTHON_EXEC_DIR@
-pythonexec_LTLIBRARIES = c_api.la
-c_api_la_LDFLAGS = -avoid-version -module -rpath $(pythonexecdir)
-c_api_la_LIBADD = $(PYTHON_LIBS) ${MU_LIB_PY}
-c_api_la_SOURCES = c_api.c

@@ -39,3 +39,11 @@ pythonsite_PYTHON=\
  url.py \
  util.py
 
+pythonexecdir=@PYTHON_EXEC_DIR@
+pythonexec_LTLIBRARIES = c_api.la
+c_api_la_LDFLAGS = -avoid-version -module -rpath $(pythonexecdir)
+c_api_la_LIBADD = $(PYTHON_LIBS) ${MU_LIB_PY}
+c_api_la_SOURCES = c_api.c
+
+INCLUDES = @MU_LIB_COMMON_INCLUDES@ @PYTHON_INCLUDES@\
+ -I$(top_srcdir)/python/libmu_py

+# Libtool library loader for Python.
+# This file is part of GNU Mailutils.
+# Copyright (C) 2011 Free Software Foundation, Inc.
+#
+# GNU Mailutils 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 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils 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 GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. 
+
+# This file modifies the normal import routine by looking additionally
+# into module.la file and trying to load corresponding so library (as
+# determined by the dlname variable in it) from the .libs subdirectory.
+#
+# It is used to load Mailutils Python modules from the source tree.
+#
+# Example usage:
+#
+#  PYTHONPATH=/path/to/mailutils-3.0/python python test.py
+
+import sys,os,imp
+
+class laloader(object):
+    def __init__(self, filename, libdir):
+        self.filename = filename
+        self.libdir = libdir
+
+    def load_module(self, name):
+        with open(self.filename) as f:
+            for line in f:
+                s = line.strip()
+                if s.startswith('dlname='):
+                    s = s[7:].strip("'\"")
+                    libname = self.libdir + '/' + s
+                    if os.path.exists(libname):
+                        return imp.load_dynamic(name, libname)
+        return None
+    
+class lafinder(object):
+    def __init__(self):
+        pass
+    def find_module(self, fullname, path=None):
+        ml = fullname.split(".")
+        s = '/'.join(ml)+'.la'
+        libs = '/'.join(ml[:-1]) + '/.libs'
+        for dir in sys.path:
+            name = dir + '/' + s
+            libdir = dir + '/' + libs
+            if os.path.exists(name) and os.path.exists(libdir):
+                return laloader(name, libdir)
+        return None
+
+sys.meta_path.append(lafinder())
+
+# End of file
+