toolsutils.py
author Dimitri Papadopoulos <dimitri.papadopoulos@cea.fr>
Tue, 22 Apr 2014 16:39:19 +0200
changeset 10222 75d6096216d7
parent 9990 c84ad981fc4a
child 10331 6f25c7e4f19b
permissions -rw-r--r--
[docstrings] fix project-wide English language mistake Even though 'u' is a wovel, it may be pronounced 'yu' which is a consonant sound. In such cases precede it with 'a' instead of 'an'.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""some utilities for cubicweb command line tools"""
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__docformat__ = "restructuredtext en"
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# XXX move most of this in logilab.common (shellutils ?)
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import os, sys
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import subprocess
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from os import listdir, makedirs, environ, chmod, walk, remove
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from os.path import exists, join, abspath, normpath
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import re
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from rlcompleter import Completer
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try:
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    import readline
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except ImportError: # readline not available, no completion
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    pass
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try:
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    from os import symlink
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except ImportError:
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    def symlink(*args):
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        raise NotImplementedError
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from logilab.common.clcommands import Command as BaseCommand
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from logilab.common.shellutils import ASK
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from cubicweb import warning # pylint: disable=E0611
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from cubicweb import ConfigurationError, ExecutionError
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def underline_title(title, car='-'):
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    return title+'\n'+(car*len(title))
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def iter_dir(directory, condition_file=None, ignore=()):
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    """iterate on a directory"""
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    for sub in listdir(directory):
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        if sub in ('CVS', '.svn', '.hg'):
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            continue
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        if condition_file is not None and \
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               not exists(join(directory, sub, condition_file)):
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            continue
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        if sub in ignore:
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            continue
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        yield sub
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def create_dir(directory):
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    """create a directory if it doesn't exist yet"""
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    try:
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        makedirs(directory)
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        print '-> created directory %s' % directory
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    except OSError as ex:
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        import errno
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        if ex.errno != errno.EEXIST:
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            raise
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        print '-> no need to create existing directory %s' % directory
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0
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def create_symlink(source, target):
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    """create a symbolic link"""
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    if exists(target):
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        remove(target)
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    symlink(source, target)
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    print '[symlink] %s <-- %s' % (target, source)
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def create_copy(source, target):
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    import shutil
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    print '[copy] %s <-- %s' % (target, source)
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    shutil.copy2(source, target)
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0
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def rm(whatever):
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    import shutil
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    shutil.rmtree(whatever)
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    print '-> removed %s' % whatever
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def show_diffs(appl_file, ref_file, askconfirm=True):
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    """interactivly replace the old file with the new file according to
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    user decision
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    """
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    import shutil
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    pipe = subprocess.Popen(['diff', '-u', appl_file, ref_file], stdout=subprocess.PIPE)
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    diffs = pipe.stdout.read()
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    if diffs:
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        if askconfirm:
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            print
0
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            print diffs
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            action = ASK.ask('Replace ?', ('Y', 'n', 'q'), 'Y').lower()
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        else:
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            action = 'y'
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        if action == 'y':
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            try:
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                shutil.copyfile(ref_file, appl_file)
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            except IOError:
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                os.system('chmod a+w %s' % appl_file)
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                shutil.copyfile(ref_file, appl_file)
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            print 'replaced'
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        elif action == 'q':
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            sys.exit(0)
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        else:
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            copy_file = appl_file + '.default'
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            copy = file(copy_file, 'w')
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            copy.write(open(ref_file).read())
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            copy.close()
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            print 'keep current version, the new file has been written to', copy_file
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    else:
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        print 'no diff between %s and %s' % (appl_file, ref_file)
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SKEL_EXCLUDE = ('*.py[co]', '*.orig', '*~', '*_flymake.py')
0
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def copy_skeleton(skeldir, targetdir, context,
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                  exclude=SKEL_EXCLUDE, askconfirm=False):
0
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    import shutil
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    from fnmatch import fnmatch
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    skeldir = normpath(skeldir)
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    targetdir = normpath(targetdir)
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    for dirpath, dirnames, filenames in walk(skeldir):
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        tdirpath = dirpath.replace(skeldir, targetdir)
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        create_dir(tdirpath)
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        for fname in filenames:
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            if any(fnmatch(fname, pat) for pat in exclude):
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                continue
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            fpath = join(dirpath, fname)
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            if 'CUBENAME' in fname:
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                tfpath = join(tdirpath, fname.replace('CUBENAME', context['cubename']))
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            elif 'DISTNAME' in fname:
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                tfpath = join(tdirpath, fname.replace('DISTNAME', context['distname']))
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            else:
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                tfpath = join(tdirpath, fname)
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            if fname.endswith('.tmpl'):
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                tfpath = tfpath[:-5]
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                if not askconfirm or not exists(tfpath) or \
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                       ASK.confirm('%s exists, overwrite?' % tfpath):
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                    fill_templated_file(fpath, tfpath, context)
0
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                    print '[generate] %s <-- %s' % (tfpath, fpath)
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            elif exists(tfpath):
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                show_diffs(tfpath, fpath, askconfirm)
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            else:
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                shutil.copyfile(fpath, tfpath)
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0
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def fill_templated_file(fpath, tfpath, context):
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    fobj = file(tfpath, 'w')
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    templated = file(fpath).read()
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    fobj.write(templated % context)
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    fobj.close()
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def restrict_perms_to_user(filepath, log=None):
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    """set -rw------- permission on the given file"""
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    if log:
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        log('set permissions to 0600 for %s', filepath)
0
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    else:
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        print '-> set permissions to 0600 for %s' % filepath
0
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    chmod(filepath, 0600)
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def read_config(config_file, raise_if_unreadable=False):
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    """read some simple configuration from `config_file` and return it as a
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    dictionary. If `raise_if_unreadable` is false (the default), an empty
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    dictionary will be returned if the file is inexistant or unreadable, else
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    :exc:`ExecutionError` will be raised.
0
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    """
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    from logilab.common.fileutils import lines
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    config = current = {}
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    try:
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        for line in lines(config_file, comments='#'):
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            try:
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                option, value = line.split('=', 1)
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            except ValueError:
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                option = line.strip().lower()
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                if option[0] == '[':
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                    # start a section
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                    section = option[1:-1]
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                    assert section not in config, \
0
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                           'Section %s is defined more than once' % section
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                    config[section] = current = {}
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                    continue
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                sys.stderr.write('ignoring malformed line\n%r\n' % line)
0
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                continue
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            option = option.strip().replace(' ', '_')
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            value = value.strip()
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            current[option] = value or None
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   192
    except IOError as ex:
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        if raise_if_unreadable:
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   194
            raise ExecutionError('%s. Are you logged with the correct user '
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                                 'to use this instance?' % ex)
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   196
        else:
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   197
            warning('missing or non readable configuration file %s (%s)',
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   198
                    config_file, ex)
0
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   199
    return config
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_HDLRS = {}
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class metacmdhandler(type):
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    def __new__(mcs, name, bases, classdict):
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        cls = super(metacmdhandler, mcs).__new__(mcs, name, bases, classdict)
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        if getattr(cls, 'cfgname', None) and getattr(cls, 'cmdname', None):
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            _HDLRS.setdefault(cls.cmdname, []).append(cls)
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        return cls
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class CommandHandler(object):
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    """configuration specific helper for cubicweb-ctl commands"""
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    __metaclass__ = metacmdhandler
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    def __init__(self, config):
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        self.config = config
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class Command(BaseCommand):
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    """base class for cubicweb-ctl commands"""
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    def config_helper(self, config, required=True, cmdname=None):
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        if cmdname is None:
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            cmdname = self.name
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        for helpercls in _HDLRS.get(cmdname, ()):
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            if helpercls.cfgname == config.name:
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                return helpercls(config)
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        if config.name == 'all-in-one':
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            for helpercls in _HDLRS.get(cmdname, ()):
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                if helpercls.cfgname == 'repository':
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                    return helpercls(config)
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        if required:
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            msg = 'No helper for command %s using %s configuration' % (
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                cmdname, config.name)
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            raise ConfigurationError(msg)
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0
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    def fail(self, reason):
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        print "command failed:", reason
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        sys.exit(1)
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0
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CONNECT_OPTIONS = (
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    ("user",
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     {'short': 'u', 'type' : 'string', 'metavar': '<user>',
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      'help': 'connect as <user> instead of being prompted to give it.',
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      }
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     ),
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    ("password",
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     {'short': 'p', 'type' : 'password', 'metavar': '<password>',
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      'help': 'automatically give <password> for authentication instead of \
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being prompted to give it.',
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      }),
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    ("host",
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     {'short': 'H', 'type' : 'string', 'metavar': '<hostname>',
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      'default': None,
0
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      'help': 'specify the name server\'s host name. Will be detected by \
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broadcast if not provided.',
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      }),
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    )
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def config_connect(appid, optconfig):
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    from cubicweb.dbapi import connect
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    from getpass import getpass
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    user = optconfig.user
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    if not user:
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        user = raw_input('login: ')
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    password = optconfig.password
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    if not password:
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        password = getpass('password: ')
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    return connect(login=user, password=password, host=optconfig.host, database=appid)
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## cwshell helpers #############################################################
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class AbstractMatcher(object):
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    """Abstract class for CWShellCompleter's matchers.
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    A matcher should implement a ``possible_matches`` method. This
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    method has to return the list of possible completions for user's input.
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    Because of the python / readline interaction, each completion should
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    be a superset of the user's input.
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    NOTE: readline tokenizes user's input and only passes last token to
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    completers.
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    """
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    def possible_matches(self, text):
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        """return possible completions for user's input.
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        Parameters:
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            text: the user's input
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        Return:
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            a list of completions. Each completion includes the original input.
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        """
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        raise NotImplementedError()
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class RQLExecuteMatcher(AbstractMatcher):
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    """Custom matcher for rql queries.
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    If user's input starts with ``rql(`` or ``session.execute(`` and
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    the corresponding rql query is incomplete, suggest some valid completions.
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    """
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    query_match_rgx = re.compile(
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        r'(?P<func_prefix>\s*(?:rql)'  # match rql, possibly indented
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        r'|'                           # or
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        r'\s*(?:\w+\.execute))'        # match .execute, possibly indented
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        # end of <func_prefix>
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        r'\('                          # followed by a parenthesis
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        r'(?P<quote_delim>["\'])'      # a quote or double quote
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        r'(?P<parameters>.*)')         # and some content
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    def __init__(self, local_ctx, req):
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        self.local_ctx = local_ctx
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        self.req = req
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        self.schema = req.vreg.schema
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        self.rsb = req.vreg['components'].select('rql.suggestions', req)
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    @staticmethod
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    def match(text):
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        """check if ``text`` looks like a call to ``rql`` or ``session.execute``
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        Parameters:
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            text: the user's input
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        Returns:
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            None if it doesn't match, the query structure otherwise.
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        """
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        query_match = RQLExecuteMatcher.query_match_rgx.match(text)
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        if query_match is None:
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            return None
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        parameters_text = query_match.group('parameters')
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        quote_delim = query_match.group('quote_delim')
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        # first parameter is fully specified, no completion needed
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        if re.match(r"(.*?)%s" % quote_delim, parameters_text) is not None:
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            return None
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        func_prefix = query_match.group('func_prefix')
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        return {
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            # user's input
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            'text': text,
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            # rql( or session.execute(
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            'func_prefix': func_prefix,
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            # offset of rql query
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            'rql_offset': len(func_prefix) + 2,
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            # incomplete rql query
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            'rql_query': parameters_text,
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            }
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   349
    def possible_matches(self, text):
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   350
        """call ``rql.suggestions`` component to complete user's input.
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   351
        """
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   352
        # readline will only send last token, but we need the entire user's input
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   353
        user_input = readline.get_line_buffer()
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   354
        query_struct = self.match(user_input)
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   355
        if query_struct is None:
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   356
            return []
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   357
        else:
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   358
            # we must only send completions of the last token => compute where it
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   359
            # starts relatively to the rql query itself.
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   360
            completion_offset = readline.get_begidx() - query_struct['rql_offset']
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   361
            rql_query = query_struct['rql_query']
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   362
            return [suggestion[completion_offset:]
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diff changeset
   363
                    for suggestion in self.rsb.build_suggestions(rql_query)]
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   364
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   365
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   366
class DefaultMatcher(AbstractMatcher):
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   367
    """Default matcher: delegate to standard's `rlcompleter.Completer`` class
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   368
    """
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   369
    def __init__(self, local_ctx):
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   370
        self.completer = Completer(local_ctx)
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   371
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   372
    def possible_matches(self, text):
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   373
        if "." in text:
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   374
            return self.completer.attr_matches(text)
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   375
        else:
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   376
            return self.completer.global_matches(text)
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   377
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   378
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   379
class CWShellCompleter(object):
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   380
    """Custom auto-completion helper for cubicweb-ctl shell.
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   381
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   382
    ``CWShellCompleter`` provides a ``complete`` method suitable for
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   383
    ``readline.set_completer``.
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diff changeset
   384
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   385
    Attributes:
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   386
        matchers: the list of ``AbstractMatcher`` instances that will suggest
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diff changeset
   387
                  possible completions
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diff changeset
   388
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diff changeset
   389
    The completion process is the following:
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diff changeset
   390
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   391
    - readline calls the ``complete`` method with user's input,
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   392
    - the ``complete`` method asks for each known matchers if
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diff changeset
   393
      it can suggest completions for user's input.
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diff changeset
   394
    """
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diff changeset
   395
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diff changeset
   396
    def __init__(self, local_ctx):
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   397
        # list of matchers to ask for possible matches on completion
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diff changeset
   398
        self.matchers = [DefaultMatcher(local_ctx)]
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diff changeset
   399
        self.matchers.insert(0, RQLExecuteMatcher(local_ctx, local_ctx['session']))
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diff changeset
   400
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diff changeset
   401
    def complete(self, text, state):
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   402
        """readline's completer method
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diff changeset
   403
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diff changeset
   404
        cf http://docs.python.org/2/library/readline.html#readline.set_completer
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diff changeset
   405
        for more details.
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diff changeset
   406
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diff changeset
   407
        Implementation inspired by `rlcompleter.Completer`
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diff changeset
   408
        """
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diff changeset
   409
        if state == 0:
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diff changeset
   410
            # reset self.matches
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diff changeset
   411
            self.matches = []
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diff changeset
   412
            for matcher in self.matchers:
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   413
                matches = matcher.possible_matches(text)
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diff changeset
   414
                if matches:
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   415
                    self.matches = matches
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diff changeset
   416
                    break
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diff changeset
   417
            else:
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   418
                return None # no matcher able to handle `text`
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diff changeset
   419
        try:
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   420
            return self.matches[state]
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diff changeset
   421
        except IndexError:
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   422
            return None