author Justin Lebar <>
Thu, 26 Jan 2012 15:53:56 -0500
changeset 85522 812a3da795fe39f9560becd59f09443b2e6255b8
parent 73555 6953340878aaaab11a6c5a39d2852f31e284868e
child 94475 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
No bug - Fix .gitignore to only ignore 'obj*' in the root directory. rs=cjones

#!/usr/bin/env python

# Version: MPL 1.1/GPL 2.0/LGPL 2.1
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
# The Original Code is code.
# The Initial Developer of the Original Code is
# Portions created by the Initial Developer are Copyright (C) 2010
# the Initial Developer. All Rights Reserved.
# Contributor(s):
#     Jeff Hammel <>     (Original author)
# Alternatively, the contents of this file may be used under the terms of
# either of the GNU General Public License Version 2 or later (the "GPL"),
# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
# ***** END LICENSE BLOCK *****

Mozilla universal manifest parser

# this file lives at

__all__ = ['read_ini', # .ini reader
           'ManifestParser', 'TestManifest', 'convert', # manifest handling
           'parse', 'ParseError', 'ExpressionParser'] # conditional expression parser

import os
import re
import shutil
import sys
from fnmatch import fnmatch
from optparse import OptionParser

version = '0.5.3' # package version
    from setuptools import setup
    setup = None

# we need relpath, but it is introduced in python 2.6
    relpath = os.path.relpath
except AttributeError:
    def relpath(path, start):
        Return a relative version of a path
        from /usr/lib/python2.6/

        if not path:
            raise ValueError("no path specified")

        start_list = os.path.abspath(start).split(os.path.sep)
        path_list = os.path.abspath(path).split(os.path.sep)

        # Work out how much of the filepath is shared by start and path.
        i = len(os.path.commonprefix([start_list, path_list]))

        rel_list = [os.path.pardir] * (len(start_list)-i) + path_list[i:]
        if not rel_list:
            return start
        return os.path.join(*rel_list)

# from:

# Implements a top-down parser/evaluator for simple boolean expressions.
# ideas taken from
# Rough grammar:
# expr := literal
#       | '(' expr ')'
#       | expr '&&' expr
#       | expr '||' expr
#       | expr '==' expr
#       | expr '!=' expr
# literal := BOOL
#          | INT
#          | STRING
#          | IDENT
# BOOL   := true|false
# INT    := [0-9]+
# STRING := "[^"]*"
# IDENT  := [A-Za-z_]\w*

# Identifiers take their values from a mapping dictionary passed as the second
# argument.

# Glossary (see above URL for details):
# - nud: null denotation
# - led: left detonation
# - lbp: left binding power
# - rbp: right binding power

class ident_token(object):
    def __init__(self, value):
        self.value = value
    def nud(self, parser):
        # identifiers take their value from the value mappings passed
        # to the parser
        return parser.value(self.value)

class literal_token(object):
    def __init__(self, value):
        self.value = value
    def nud(self, parser):
        return self.value

class eq_op_token(object):
    def led(self, parser, left):
        return left == parser.expression(self.lbp)
class neq_op_token(object):
    def led(self, parser, left):
        return left != parser.expression(self.lbp)

class not_op_token(object):
    def nud(self, parser):
        return not parser.expression()

class and_op_token(object):
    def led(self, parser, left):
        right = parser.expression(self.lbp)
        return left and right
class or_op_token(object):
    def led(self, parser, left):
        right = parser.expression(self.lbp)
        return left or right

class lparen_token(object):
    def nud(self, parser):
        expr = parser.expression()
        return expr

class rparen_token(object):

class end_token(object):
    """always ends parsing"""

### derived literal tokens

class bool_token(literal_token):
    def __init__(self, value):
        value = {'true':True, 'false':False}[value]
        literal_token.__init__(self, value)

class int_token(literal_token):
    def __init__(self, value):
        literal_token.__init__(self, int(value))

class string_token(literal_token):
    def __init__(self, value):
        literal_token.__init__(self, value[1:-1])

precedence = [(end_token, rparen_token),
              (eq_op_token, neq_op_token),
for index, rank in enumerate(precedence):
    for token in rank:
        token.lbp = index # lbp = lowest left binding power

class ParseError(Exception):
    """errror parsing conditional expression"""

class ExpressionParser(object):
    def __init__(self, text, valuemapping, strict=False):
        Initialize the parser with input |text|, and |valuemapping| as
        a dict mapping identifier names to values.
        self.text = text
        self.valuemapping = valuemapping
        self.strict = strict

    def _tokenize(self):
        Lex the input text into tokens and yield them in sequence.
        # scanner callbacks
        def bool_(scanner, t): return bool_token(t)
        def identifier(scanner, t): return ident_token(t)
        def integer(scanner, t): return int_token(t)
        def eq(scanner, t): return eq_op_token()
        def neq(scanner, t): return neq_op_token()
        def or_(scanner, t): return or_op_token()
        def and_(scanner, t): return and_op_token()
        def lparen(scanner, t): return lparen_token()
        def rparen(scanner, t): return rparen_token()
        def string_(scanner, t): return string_token(t)
        def not_(scanner, t): return not_op_token()

        scanner = re.Scanner([
            (r"true|false", bool_),
            (r"[a-zA-Z_]\w*", identifier),
            (r"[0-9]+", integer),
            (r'("[^"]*")|(\'[^\']*\')', string_),
            (r"==", eq),
            (r"!=", neq),
            (r"\|\|", or_),
            (r"!", not_),
            (r"&&", and_),
            (r"\(", lparen),
            (r"\)", rparen),
            (r"\s+", None), # skip whitespace
        tokens, remainder = scanner.scan(self.text)
        for t in tokens:
            yield t
        yield end_token()

    def value(self, ident):
        Look up the value of |ident| in the value mapping passed in the
        if self.strict:
            return self.valuemapping[ident]
            return self.valuemapping.get(ident, None)

    def advance(self, expected):
        Assert that the next token is an instance of |expected|, and advance
        to the next token.
        if not isinstance(self.token, expected):
            raise Exception, "Unexpected token!"
        self.token =
    def expression(self, rbp=0):
        Parse and return the value of an expression until a token with
        right binding power greater than rbp is encountered.
        t = self.token
        self.token =
        left = t.nud(self)
        while rbp < self.token.lbp:
            t = self.token
            self.token =
            left = t.led(self, left)
        return left

    def parse(self):
        Parse and return the value of the expression in the text
        passed to the constructor. Raises a ParseError if the expression
        could not be parsed.
            self.iter = self._tokenize()
            self.token =
            return self.expression()
            raise ParseError("could not parse: %s; variables: %s" % (self.text, self.valuemapping))

    __call__ = parse

def parse(text, **values):
    Parse and evaluate a boolean expression in |text|. Use |values| to look
    up the value of identifiers referenced in the expression. Returns the final
    value of the expression. A ParseError will be raised if parsing fails.
    return ExpressionParser(text, values).parse()

def normalize_path(path):
    """normalize a relative path"""
    if sys.platform.startswith('win'):
        return path.replace('/', os.path.sep)
    return path

def denormalize_path(path):
    """denormalize a relative path"""
    if sys.platform.startswith('win'):
        return path.replace(os.path.sep, '/')
    return path

def read_ini(fp, variables=None, default='DEFAULT',
             comments=';#', separators=('=', ':'),
    read an .ini file and return a list of [(section, values)]
    - fp : file pointer or path to read
    - variables : default set of variables
    - default : name of the section for the default section
    - comments : characters that if they start a line denote a comment
    - separators : strings that denote key, value separation in order
    - strict : whether to be strict about parsing

    if variables is None:
        variables = {}

    if isinstance(fp, basestring):
        fp = file(fp)

    sections = []
    key = value = None
    section_names = set([])

    # read the lines
    for line in fp.readlines():

        stripped = line.strip()

        # ignore blank lines
        if not stripped:
            # reset key and value to avoid continuation lines
            key = value = None

        # ignore comment lines
        if stripped[0] in comments:

        # check for a new section
        if len(stripped) > 2 and stripped[0] == '[' and stripped[-1] == ']':
            section = stripped[1:-1].strip()
            key = value = None

            # deal with DEFAULT section
            if section.lower() == default.lower():
                if strict:
                    assert default not in section_names
                current_section = variables

            if strict:
                # make sure this section doesn't already exist
                assert section not in section_names

            current_section = {}
            sections.append((section, current_section))

        # if there aren't any sections yet, something bad happen
        if not section_names:
            raise Exception('No sections found')

        # (key, value) pair
        for separator in separators:
            if separator in stripped:
                key, value = stripped.split(separator, 1)
                key = key.strip()
                value = value.strip()

                if strict:
                    # make sure this key isn't already in the section or empty
                    assert key
                    if current_section is not variables:
                        assert key not in current_section

                current_section[key] = value
            # continuation line ?
            if line[0].isspace() and key:
                value = '%s%s%s' % (value, os.linesep, stripped)
                current_section[key] = value
                # something bad happen!
                raise Exception("Not sure what you're trying to do")

    # interpret the variables
    def interpret_variables(global_dict, local_dict):
        variables = global_dict.copy()
        return variables

    sections = [(i, interpret_variables(variables, j)) for i, j in sections]
    return sections

### objects for parsing manifests

class ManifestParser(object):
    """read .ini manifests"""

    ### methods for reading manifests

    def __init__(self, manifests=(), defaults=None, strict=True):
        self._defaults = defaults or {}
        self.tests = []
        self.strict = strict
        self.rootdir = None
        self.relativeRoot = None
        if manifests:

    def getRelativeRoot(self, root):
        return root

    def read(self, *filenames, **defaults):

        # ensure all files exist
        missing = [ filename for filename in filenames
                    if not os.path.exists(filename) ]
        if missing:
            raise IOError('Missing files: %s' % ', '.join(missing))

        # process each file
        for filename in filenames:

            # set the per file defaults
            defaults = defaults.copy() or self._defaults.copy()
            here = os.path.dirname(os.path.abspath(filename))
            defaults['here'] = here

            if self.rootdir is None:
                # set the root directory
                # == the directory of the first manifest given
                self.rootdir = here

            # read the configuration
            sections = read_ini(fp=filename, variables=defaults, strict=self.strict)

            # get the tests
            for section, data in sections:

                # a file to include
                # TODO: keep track of included file structure:
                # self.manifests = {'manifest.ini': 'relative/path.ini'}
                if section.startswith('include:'):
                    include_file = section.split('include:', 1)[-1]
                    include_file = normalize_path(include_file)
                    if not os.path.isabs(include_file):
                        include_file = os.path.join(self.getRelativeRoot(here), include_file)
                    if not os.path.exists(include_file):
                        if self.strict:
                            raise IOError("File '%s' does not exist" % include_file)
                    include_defaults = data.copy()
          , **include_defaults)

                # otherwise an item
                test = data
                test['name'] = section
                test['manifest'] = os.path.abspath(filename)

                # determine the path
                path = test.get('path', section)
                if '://' not in path: # don't futz with URLs
                    path = normalize_path(path)
                    if not os.path.isabs(path):
                        path = os.path.join(here, path)
                test['path'] = path

                # append the item

    ### methods for querying manifests

    def query(self, *checks, **kw):
        general query function for tests
        - checks : callable conditions to test if the test fulfills the query
        tests = kw.get('tests', None)
        if tests is None:
            tests = self.tests
        retval = []
        for test in tests:
            for check in checks:
                if not check(test):
        return retval

    def get(self, _key=None, inverse=False, tags=None, tests=None, **kwargs):
        # TODO: pass a dict instead of kwargs since you might hav
        # e.g. 'inverse' as a key in the dict

        # TODO: tags should just be part of kwargs with None values
        # (None == any is kinda weird, but probably still better)

        # fix up tags
        if tags:
            tags = set(tags)
            tags = set()

        # make some check functions
        if inverse:
            has_tags = lambda test: not tags.intersection(test.keys())
            def dict_query(test):
                for key, value in kwargs.items():
                    if test.get(key) == value:
                        return False
                return True
            has_tags = lambda test: tags.issubset(test.keys())
            def dict_query(test):
                for key, value in kwargs.items():
                    if test.get(key) != value:
                        return False
                return True

        # query the tests
        tests = self.query(has_tags, dict_query, tests=tests)

        # if a key is given, return only a list of that key
        # useful for keys like 'name' or 'path'
        if _key:
            return [test[_key] for test in tests]

        # return the tests
        return tests

    def missing(self, tests=None):
        """return list of tests that do not exist on the filesystem"""
        if tests is None:
            tests = self.tests
        return [test for test in tests
                if not os.path.exists(test['path'])]

    def manifests(self, tests=None):
        return manifests in order in which they appear in the tests
        if tests is None:
            tests = self.tests
        manifests = []
        for test in tests:
            manifest = test.get('manifest')
            if not manifest:
            if manifest not in manifests:
        return manifests

    ### methods for outputting from manifests

    def write(self, fp=sys.stdout, rootdir=None,
              global_tags=None, global_kwargs=None,
              local_tags=None, local_kwargs=None):
        write a manifest given a query
        global and local options will be munged to do the query
        globals will be written to the top of the file
        locals (if given) will be written per test

        # root directory
        if rootdir is None:
            rootdir = self.rootdir

        # sanitize input
        global_tags = global_tags or set()
        local_tags = local_tags or set()
        global_kwargs = global_kwargs or {}
        local_kwargs = local_kwargs or {}
        # create the query
        tags = set([])
        kwargs = {}

        # get matching tests
        tests = self.get(tags=tags, **kwargs)

        # print the .ini manifest
        if global_tags or global_kwargs:
            print >> fp, '[DEFAULT]'
            for tag in global_tags:
                print >> fp, '%s =' % tag
            for key, value in global_kwargs.items():
                print >> fp, '%s = %s' % (key, value)
            print >> fp

        for test in tests:
            test = test.copy() # don't overwrite

            path = test['name']
            if not os.path.isabs(path):
                path = denormalize_path(relpath(test['path'], self.rootdir))
            print >> fp, '[%s]' % path
            # reserved keywords:
            reserved = ['path', 'name', 'here', 'manifest']
            for key in sorted(test.keys()):
                if key in reserved:
                if key in global_kwargs:
                if key in global_tags and not test[key]:
                print >> fp, '%s = %s' % (key, test[key])
            print >> fp

    def copy(self, directory, rootdir=None, *tags, **kwargs):
        copy the manifests and associated tests
        - directory : directory to copy to
        - rootdir : root directory to copy to (if not given from manifests)
        - tags : keywords the tests must have
        - kwargs : key, values the tests must match
        # XXX note that copy does *not* filter the tests out of the
        # resulting manifest; it just stupidly copies them over.
        # ideally, it would reread the manifests and filter out the
        # tests that don't match *tags and **kwargs
        # destination
        if not os.path.exists(directory):
            # sanity check
            assert os.path.isdir(directory)

        # tests to copy
        tests = self.get(tags=tags, **kwargs)
        if not tests:
            return # nothing to do!

        # root directory
        if rootdir is None:
            rootdir = self.rootdir

        # copy the manifests + tests
        manifests = [relpath(manifest, rootdir) for manifest in self.manifests()]
        for manifest in manifests:
            destination = os.path.join(directory, manifest)
            dirname = os.path.dirname(destination)
            if not os.path.exists(dirname):
                # sanity check
                assert os.path.isdir(dirname)
            shutil.copy(os.path.join(rootdir, manifest), destination)
        for test in tests:
            if os.path.isabs(test['name']):
            source = test['path']
            if not os.path.exists(source):
                print >> sys.stderr, "Missing test: '%s' does not exist!" % source
                # TODO: should err on strict
            destination = os.path.join(directory, relpath(test['path'], rootdir))
            shutil.copy(source, destination)
            # TODO: ensure that all of the tests are below the from_dir

    def update(self, from_dir, rootdir=None, *tags, **kwargs):
        update the tests as listed in a manifest from a directory
        - from_dir : directory where the tests live
        - rootdir : root directory to copy to (if not given from manifests)
        - tags : keys the tests must have
        - kwargs : key, values the tests must match
        # get the tests
        tests = self.get(tags=tags, **kwargs)

        # get the root directory
        if not rootdir:
            rootdir = self.rootdir

        # copy them!
        for test in tests:
            if not os.path.isabs(test['name']):
                _relpath = relpath(test['path'], rootdir)
                source = os.path.join(from_dir, _relpath)
                if not os.path.exists(source):
                    # TODO err on strict
                    print >> sys.stderr, "Missing test: '%s'; skipping" % test['name']
                destination = os.path.join(rootdir, _relpath)
                shutil.copy(source, destination)

class TestManifest(ManifestParser):
    apply logic to manifests;  this is your integration layer :)
    specific harnesses may subclass from this if they need more logic

    def filter(self, values, tests):
        filter on a specific list tag, e.g.:
        run-if.os = win linux
        skip-if.os = mac

        # tags:
        run_tag = 'run-if'
        skip_tag = 'skip-if'
        fail_tag = 'fail-if'

        # loop over test
        for test in tests:
            reason = None # reason to disable
            # tagged-values to run
            if run_tag in test:
                condition = test[run_tag]
                if not parse(condition, **values):
                    reason = '%s: %s' % (run_tag, condition)

            # tagged-values to skip
            if skip_tag in test:
                condition = test[skip_tag]
                if parse(condition, **values):
                    reason = '%s: %s' % (skip_tag, condition)

            # mark test as disabled if there's a reason
            if reason:
                test.setdefault('disabled', reason)        

            # mark test as a fail if so indicated
            if fail_tag in test:
                condition = test[fail_tag]
                if parse(condition, **values):
                    test['expected'] = 'fail'

    def active_tests(self, exists=True, disabled=True, **values):
        - exists : return only existing tests
        - disabled : whether to return disabled tests
        - tags : keys and values to filter on (e.g. `os = linux mac`)

        tests = [i.copy() for i in self.tests] # shallow copy

        # mark all tests as passing unless indicated otherwise
        for test in tests:
            test['expected'] = test.get('expected', 'pass')
        # ignore tests that do not exist
        if exists:
            tests = [test for test in tests if os.path.exists(test['path'])]

        # filter by tags
        self.filter(values, tests)

        # ignore disabled tests if specified
        if not disabled:
            tests = [test for test in tests
                     if not 'disabled' in test]

        # return active tests
        return tests

    def test_paths(self):
        return [test['path'] for test in self.active_tests()]

### utility function(s); probably belongs elsewhere

def convert(directories, pattern=None, ignore=(), write=None):
    convert directories to a simple manifest

    retval = []
    include = []
    for directory in directories:
        for dirpath, dirnames, filenames in os.walk(directory):

            # filter out directory names
            dirnames = [ i for i in dirnames if i not in ignore ]

            # reference only the subdirectory
            _dirpath = dirpath
            dirpath = dirpath.split(directory, 1)[-1].strip(os.path.sep)

            if dirpath.split(os.path.sep)[0] in ignore:

            # filter by glob
            if pattern:
                filenames = [filename for filename in filenames
                             if fnmatch(filename, pattern)]


            # write a manifest for each directory
            if write and (dirnames or filenames):
                manifest = file(os.path.join(_dirpath, write), 'w')
                for dirname in dirnames:
                    print >> manifest, '[include:%s]' % os.path.join(dirname, write)
                for filename in filenames:
                    print >> manifest, '[%s]' % filename

            # add to the list
            retval.extend([denormalize_path(os.path.join(dirpath, filename))
                           for filename in filenames])

    if write:
        return # the manifests have already been written!
    retval = ['[%s]' % filename for filename in retval]
    return '\n'.join(retval)

### command line attributes

class ParserError(Exception):
  """error for exceptions while parsing the command line"""

def parse_args(_args):
    parse and return:
    --keys=value (or --key value)

    # return values
    _dict = {}
    tags = []
    args = []

    # parse the arguments
    key = None
    for arg in _args:
        if arg.startswith('---'):
            raise ParserError("arguments should start with '-' or '--' only")
        elif arg.startswith('--'):
            if key:
                raise ParserError("Key %s still open" % key)
            key = arg[2:]
            if '=' in key:
                key, value = key.split('=', 1)
                _dict[key] = value
                key = None
        elif arg.startswith('-'):
            if key:
                raise ParserError("Key %s still open" % key)
            if key:
                _dict[key] = arg

    # return values
    return (_dict, tags, args)

### classes for subcommands

class CLICommand(object):
    usage = '%prog [options] command'
    def __init__(self, parser):
      self._parser = parser # master parser
    def parser(self):
      return OptionParser(usage=self.usage, description=self.__doc__,

class Copy(CLICommand):
    usage = '%prog [options] copy manifest directory -tag1 -tag2 --key1=value1 --key2=value2 ...'
    def __call__(self, options, args):
      # parse the arguments
        kwargs, tags, args = parse_args(args)
      except ParserError, e:

      # make sure we have some manifests, otherwise it will
      # be quite boring
      if not len(args) == 2:
        HelpCLI(self._parser)(options, ['copy'])

      # read the manifests
      # TODO: should probably ensure these exist here
      manifests = ManifestParser()[0])

      # print the resultant query
      manifests.copy(args[1], None, *tags, **kwargs)

class CreateCLI(CLICommand):
    create a manifest from a list of directories
    usage = '%prog [options] create directory <directory> <...>'

    def parser(self):
        parser = CLICommand.parser(self)
        parser.add_option('-p', '--pattern', dest='pattern',
                          help="glob pattern for files")
        parser.add_option('-i', '--ignore', dest='ignore',
                          default=[], action='append',
                          help='directories to ignore')
        parser.add_option('-w', '--in-place', dest='in_place',
                          help='Write .ini files in place; filename to write to')
        return parser

    def __call__(self, _options, args):
        parser = self.parser()
        options, args = parser.parse_args(args)

        # need some directories
        if not len(args):

        # add the directories to the manifest
        for arg in args:
            assert os.path.exists(arg)
            assert os.path.isdir(arg)
            manifest = convert(args, pattern=options.pattern, ignore=options.ignore,
        if manifest:
            print manifest

class WriteCLI(CLICommand):
    write a manifest based on a query
    usage = '%prog [options] write manifest <manifest> -tag1 -tag2 --key1=value1 --key2=value2 ...'
    def __call__(self, options, args):

        # parse the arguments
            kwargs, tags, args = parse_args(args)
        except ParserError, e:

        # make sure we have some manifests, otherwise it will
        # be quite boring
        if not args:
            HelpCLI(self._parser)(options, ['write'])

        # read the manifests
        # TODO: should probably ensure these exist here
        manifests = ManifestParser()*args)

        # print the resultant query
        manifests.write(global_tags=tags, global_kwargs=kwargs)

class HelpCLI(CLICommand):
    get help on a command
    usage = '%prog [options] help [command]'

    def __call__(self, options, args):
        if len(args) == 1 and args[0] in commands:
            print '\nCommands:'
            for command in sorted(commands):
                print '  %s : %s' % (command, commands[command].__doc__.strip())

class SetupCLI(CLICommand):
    setup using setuptools
    # use from the repo when you want to distribute to python!
    # otherwise setuptools will complain that it can't find
    # and result in a useless package
    usage = '%prog [options] setup [setuptools options]'
    def __call__(self, options, args):
        sys.argv = [sys.argv[0]] + args
        assert setup is not None, "You must have setuptools installed to use SetupCLI"
        here = os.path.dirname(os.path.abspath(__file__))
            filename = os.path.join(here, 'README.txt')
            description = file(filename).read()
            description = ''

              description="Universal manifests for Mozilla test harnesses",
              classifiers=[], # Get strings from
              keywords='mozilla manifests',
              author='Jeff Hammel',
                  # -*- Extra requirements: -*-
              manifestparser = manifestparser:main

class UpdateCLI(CLICommand):
    update the tests as listed in a manifest from a directory
    usage = '%prog [options] update manifest directory -tag1 -tag2 --key1=value1 --key2=value2 ...'

    def __call__(self, options, args):
        # parse the arguments
            kwargs, tags, args = parse_args(args)
        except ParserError, e:

        # make sure we have some manifests, otherwise it will
        # be quite boring
        if not len(args) == 2:
            HelpCLI(self._parser)(options, ['update'])

        # read the manifests
        # TODO: should probably ensure these exist here
        manifests = ManifestParser()[0])

        # print the resultant query
        manifests.update(args[1], None, *tags, **kwargs)

# command -> class mapping
commands = { 'create': CreateCLI,
             'help': HelpCLI,
             'update': UpdateCLI,
             'write': WriteCLI }
if setup is not None:
    commands['setup'] = SetupCLI

def main(args=sys.argv[1:]):
    """console_script entry point"""

    # set up an option parser
    usage = '%prog [options] [command] ...'
    description = __doc__
    parser = OptionParser(usage=usage, description=description)
    parser.add_option('-s', '--strict', dest='strict',
                      action='store_true', default=False,
                      help='adhere strictly to errors')

    options, args = parser.parse_args(args)

    if not args:
        HelpCLI(parser)(options, args)

    # get the command
    command = args[0]
    if command not in commands:
        parser.error("Command must be one of %s (you gave '%s')" % (', '.join(sorted(commands.keys())), command))

    handler = commands[command](parser)
    handler(options, args[1:])

if __name__ == '__main__':