Merged Trevor's tree

1 files changed, 67 insertions, 0 deletions

diff --git a/libbe/util/plugin.py b/libbe/util/plugin.py
new file mode 100644
index 0000000..e598c34
--- /dev/null
+++ b/libbe/util/plugin.py
@@ -0,0 +1,67 @@
+# Copyright (C) 2005-2010 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
+
+
+_PLUGIN_PATH = os.path.realpath(
+    os.path.dirname(
+        os.path.dirname(
+            os.path.dirname(__file__))))
+if _PLUGIN_PATH not in sys.path:
+    sys.path.append(_PLUGIN_PATH)
+
+def import_by_name(modname):
+    """
+    >>> mod = import_by_name('libbe.bugdir')
+    >>> 'BugDir' in dir(mod)
+    True
+    >>> import_by_name('libbe.highly_unlikely')
+    Traceback (most recent call last):
+      ...
+    ImportError: No module named highly_unlikely
+    """
+    module = __import__(modname)
+    components = modname.split('.')
+    for comp in components[1:]:
+        module = getattr(module, comp)
+    return module
+
+def modnames(prefix):
+    """
+    >>> 'list' in [n for n in modnames('libbe.command')]
+    True
+    >>> 'plugin' in [n for n in modnames('libbe.util')]
+    True
+    """
+    components = prefix.split('.')
+    modfiles = os.listdir(os.path.join(_PLUGIN_PATH, *components))
+    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]