move to pygobject and glade

This ports the code to PyGObject, and also changes it to use Glade to
edit the user interface elements.

gui/invoker.py

@@ -0,0 +1,31 @@
+# Copyright (C) 2013 Tom Tromey <tom@tromey.com>
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+import gdb
+
+class Invoker(object):
+    """A simple class that can invoke a gdb command.
+    This is suitable for use as an event handler in Gtk."""
+
+    def __init__(self, cmd):
+        self.cmd = cmd
+
+    # This is invoked in the gdb thread to run the command.
+    def do_call(self):
+        gdb.execute(self.cmd, from_tty = True, to_string = True)
+
+    # The object itself is the Gtk event handler.
+    def __call__(self, *args):
+        gdb.post_event(self.do_call)