1 files changed, 75 insertions, 0 deletions
diff --git a/libbe/util/plugin.py b/libbe/util/plugin.py
new file mode 100644
index 0000000..edb4922
--- /dev/null
+++ b/libbe/util/plugin.py
@@ -0,0 +1,75 @@
+# Copyright (C) 2005-2009 Aaron Bentley and Panometrics, Inc.
+#                         Gianluca Montecchi <gian@grys.it>
+#                         Marien Zwart <marienz@gentoo.org>
+#                         W. Trevor King <wking@drexel.edu>
+#
+# 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.
+
+"""
+Allow simple listing and loading of the various becommands and libbe
+submodules (i.e. "plugins").
+"""
+
+import os
+import os.path
+import sys
+
+import libbe
+if libbe.TESTING == True:
+    import doctest
+
+def import_by_name(mod_name):
+    module = __import__(mod_name)
+    components = mod_name.split('.')
+    for comp in components[1:]:
+        module = getattr(module, comp)
+    return module
+
+def iter_plugins(prefix):
+    """
+    >>> "list" in [n for n,m in iter_plugins("becommands")]
+    True
+    >>> "plugin" in [n for n,m in iter_plugins("libbe")]
+    True
+    """
+    modfiles = os.listdir(os.path.join(plugin_path, prefix))
+    modfiles.sort()
+    for modfile in modfiles:
+        if modfile.startswith('.'):
+            continue # the occasional emacs temporary file
+        if modfile.endswith(".py") and modfile != "__init__.py":
+            yield modfile[:-3], my_import(prefix+"."+modfile[:-3])
+
+
+def get_plugin(prefix, name):
+    """
+    >>> get_plugin("becommands", "asdf") is None
+    True
+    >>> q = repr(get_plugin("becommands", "list"))
+    >>> q.startswith("<module 'becommands.list' from ")
+    True
+    """
+    dirprefix = os.path.join(*prefix.split('.'))
+    command_path = os.path.join(plugin_path, dirprefix, name+".py")
+    if os.path.isfile(command_path):
+        return my_import(prefix + "." + name)
+    return None
+
+plugin_path = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))
+if plugin_path not in sys.path:
+    sys.path.append(plugin_path)
+
+if libbe.TESTING == True:
+    suite = doctest.DocTestSuite()