~azzar1/unity/add-show-desktop-key

1079 by William Grant
Merge setup-refactor branch. This completely breaks existing installations;
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# IVLE - Informatics Virtual Learning Environment
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# Copyright (C) 2008 The University of Melbourne
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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# Module: Subversion utilities
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# Author: William Grant
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# Date:   16/07/2008
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import stat
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import pysvn
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def revision_from_string(r_str):
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    if r_str is None:
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        pass
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    elif r_str == "HEAD":
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        return pysvn.Revision( pysvn.opt_revision_kind.head )
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    elif r_str == "WORKING":
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        return pysvn.Revision( pysvn.opt_revision_kind.working )
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    elif r_str == "BASE":
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        return pysvn.Revision( pysvn.opt_revision_kind.base )
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    else:
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        # Is it a number?
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        try:
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            r = int(r_str)
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            return pysvn.Revision( pysvn.opt_revision_kind.number, r)
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        except:
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            pass
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    return None
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def revision_exists(client, path, revision):
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    try:
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        client.list(path, revision=revision)
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        return True
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    except pysvn.ClientError:
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        return False
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class PysvnListStatWrapper:
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    '''Wrap a pysvn listing object to look somewhat like a result of
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       os.stat.
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    '''
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    def __init__(self, pysvn_list):
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        self.pysvn_list = pysvn_list
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    def __getattr__(self, name):
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        try:
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            if name == 'st_mode':
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                # Special magic needed.
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                if self.pysvn_list.kind == pysvn.node_kind.dir:
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                    return stat.S_IFDIR
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                else:
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		    return stat.S_IFREG
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                return value
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            return getattr(self.pysvn_list,
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                           {'st_mtime': 'time',
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                            'st_size': 'size',
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                           }[name])
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        except AttributeError, KeyError:
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            raise AttributeError, name