# fancyopts.py - better command line parsing

#

#  Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import functools

from .i18n import _

from . import (

    error,

    pycompat,

)

# Set of flags to not apply boolean negation logic on

nevernegate = {

    # avoid --no-noninteractive

    'noninteractive',

    # These two flags are special because they cause hg to do one

    # thing and then exit, and so aren't suitable for use in things

    # like aliases anyway.

    'help',

    'version',

}

def _earlyoptarg(arg, shortlist, namelist):

    """Check if the given arg is a valid unabbreviated option

    Returns (flag_str, has_embedded_value?, embedded_value, takes_value?)

    >>> def opt(arg):

    ...     return _earlyoptarg(arg, b'R:q', [b'cwd=', b'debugger'])

    long form:

    >>> opt(b'--cwd')

    ('--cwd', False, '', True)

    >>> opt(b'--cwd=')

    ('--cwd', True, '', True)

    >>> opt(b'--cwd=foo')

    ('--cwd', True, 'foo', True)

    >>> opt(b'--debugger')

    ('--debugger', False, '', False)

    >>> opt(b'--debugger=')  # invalid but parsable

    ('--debugger', True, '', False)

    short form:

    >>> opt(b'-R')

    ('-R', False, '', True)

    >>> opt(b'-Rfoo')

    ('-R', True, 'foo', True)

    >>> opt(b'-q')

    ('-q', False, '', False)

    >>> opt(b'-qfoo')  # invalid but parsable

    ('-q', True, 'foo', False)

    unknown or invalid:

    >>> opt(b'--unknown')

    ('', False, '', False)

    >>> opt(b'-u')

    ('', False, '', False)

    >>> opt(b'-ufoo')

    ('', False, '', False)

    >>> opt(b'--')

    ('', False, '', False)

    >>> opt(b'-')

    ('', False, '', False)

    >>> opt(b'-:')

    ('', False, '', False)

    >>> opt(b'-:foo')

    ('', False, '', False)

    """

    if arg.startswith('--'):

        flag, eq, val = arg.partition('=')

        if flag[2:] in namelist:

            return flag, bool(eq), val, False

        if flag[2:] + '=' in namelist:

            return flag, bool(eq), val, True

    elif arg.startswith('-') and arg != '-' and not arg.startswith('-:'):

        flag, val = arg[:2], arg[2:]

        i = shortlist.find(flag[1:])

        if i >= 0:

            return flag, bool(val), val, shortlist.startswith(':', i + 1)

    return '', False, '', False

def earlygetopt(args, shortlist, namelist, gnu=False, keepsep=False):

    """Parse options like getopt, but ignores unknown options and abbreviated

    forms

    If gnu=False, this stops processing options as soon as a non/unknown-option

    argument is encountered. Otherwise, option and non-option arguments may be

    intermixed, and unknown-option arguments are taken as non-option.

    If keepsep=True, '--' won't be removed from the list of arguments left.

    This is useful for stripping early options from a full command arguments.

    >>> def get(args, gnu=False, keepsep=False):

    ...     return earlygetopt(args, b'R:q', [b'cwd=', b'debugger'],

    ...                        gnu=gnu, keepsep=keepsep)

    default parsing rules for early options:

    >>> get([b'x', b'--cwd', b'foo', b'-Rbar', b'-q', b'y'], gnu=True)

    ([('--cwd', 'foo'), ('-R', 'bar'), ('-q', '')], ['x', 'y'])

    >>> get([b'x', b'--cwd=foo', b'y', b'-R', b'bar', b'--debugger'], gnu=True)

    ([('--cwd', 'foo'), ('-R', 'bar'), ('--debugger', '')], ['x', 'y'])

    >>> get([b'--unknown', b'--cwd=foo', b'--', '--debugger'], gnu=True)

    ([('--cwd', 'foo')], ['--unknown', '--debugger'])

    restricted parsing rules (early options must come first):

    >>> get([b'--cwd', b'foo', b'-Rbar', b'x', b'-q', b'y'], gnu=False)

    ([('--cwd', 'foo'), ('-R', 'bar')], ['x', '-q', 'y'])

    >>> get([b'--cwd=foo', b'x', b'y', b'-R', b'bar', b'--debugger'], gnu=False)

    ([('--cwd', 'foo')], ['x', 'y', '-R', 'bar', '--debugger'])

    >>> get([b'--unknown', b'--cwd=foo', b'--', '--debugger'], gnu=False)

    ([], ['--unknown', '--cwd=foo', '--', '--debugger'])

    stripping early options (without loosing '--'):

    >>> get([b'x', b'-Rbar', b'--', '--debugger'], gnu=True, keepsep=True)[1]

    ['x', '--', '--debugger']

    last argument:

    >>> get([b'--cwd'])

    ([], ['--cwd'])

    >>> get([b'--cwd=foo'])

    ([('--cwd', 'foo')], [])

    >>> get([b'-R'])

    ([], ['-R'])

    >>> get([b'-Rbar'])

    ([('-R', 'bar')], [])

    >>> get([b'-q'])

    ([('-q', '')], [])

    >>> get([b'-q', b'--'])

    ([('-q', '')], [])

    '--' may be a value:

    >>> get([b'-R', b'--', b'x'])

    ([('-R', '--')], ['x'])

    >>> get([b'--cwd', b'--', b'x'])

    ([('--cwd', '--')], ['x'])

    value passed to bool options:

    >>> get([b'--debugger=foo', b'x'])

    ([], ['--debugger=foo', 'x'])

    >>> get([b'-qfoo', b'x'])

    ([], ['-qfoo', 'x'])

    short option isn't separated with '=':

    >>> get([b'-R=bar'])

    ([('-R', '=bar')], [])

    ':' may be in shortlist, but shouldn't be taken as an option letter:

    >>> get([b'-:', b'y'])

    ([], ['-:', 'y'])

    '-' is a valid non-option argument:

    >>> get([b'-', b'y'])

    ([], ['-', 'y'])

    """

    parsedopts = []

    parsedargs = []

    pos = 0

    while pos < len(args):

        arg = args[pos]

        if arg == '--':

            pos += not keepsep

            break

        flag, hasval, val, takeval = _earlyoptarg(arg, shortlist, namelist)

        if not hasval and takeval and pos + 1 >= len(args):

            # missing last argument

            break

        if not flag or hasval and not takeval:

            # non-option argument or -b/--bool=INVALID_VALUE

            if gnu:

                parsedargs.append(arg)

                pos += 1

            else:

                break

        elif hasval == takeval:

            # -b/--bool or -s/--str=VALUE

            parsedopts.append((flag, val))

            pos += 1

        else:

            # -s/--str VALUE

            parsedopts.append((flag, args[pos + 1]))

            pos += 2

    parsedargs.extend(args[pos:])

    return parsedopts, parsedargs

def fancyopts(args, options, state, gnu=False, early=False, optaliases=None):

    """

    read args, parse options, and store options in state

    each option is a tuple of:

      short option or ''

      long option

      default value

      description

      option value label(optional)

    option types include:

      boolean or none - option sets variable in state to true

      string - parameter string is stored in state

      list - parameter string is added to a list

      integer - parameter strings is stored as int

      function - call function with parameter

    optaliases is a mapping from a canonical option name to a list of

    additional long options. This exists for preserving backward compatibility

    of early options. If we want to use it extensively, please consider moving

    the functionality to the options table (e.g separate long options by '|'.)

    non-option args are returned

    """

    if optaliases is None:

        optaliases = {}

    namelist = []

    shortlist = ''

    argmap = {}

    defmap = {}

    negations = {}

    alllong = set(o[1] for o in options)

    for option in options:

        if len(option) == 5:

            short, name, default, comment, dummy = option

        else:

            short, name, default, comment = option

        # convert opts to getopt format

        onames = [name]

        onames.extend(optaliases.get(name, []))

        name = name.replace('-', '_')

        argmap['-' + short] = name

        for n in onames:

            argmap['--' + n] = name

        defmap[name] = default

        # copy defaults to state

        if isinstance(default, list):

            state[name] = default[:]

        elif callable(default):

            state[name] = None

        else:

            state[name] = default

        # does it take a parameter?

        if not (default is None or default is True or default is False):

            if short:

                short += ':'

            onames = [n + '=' for n in onames]

        elif name not in nevernegate:

            for n in onames:

                if n.startswith('no-'):

                    insert = n[3:]

                else:

                    insert = 'no-' + n

                # backout (as a practical example) has both --commit and

                # --no-commit options, so we don't want to allow the

                # negations of those flags.

                if insert not in alllong:

                    assert ('--' + n) not in negations

                    negations['--' + insert] = '--' + n

                    namelist.append(insert)

        if short:

            shortlist += short

        if name:

            namelist.extend(onames)

    # parse arguments

    if early:

        parse = functools.partial(earlygetopt, gnu=gnu)

    elif gnu:

        parse = pycompat.gnugetoptb

    else:

        parse = pycompat.getoptb

    opts, args = parse(args, shortlist, namelist)

    # transfer result to state

    for opt, val in opts:

        boolval = True

        negation = negations.get(opt, False)

        if negation:

            opt = negation

            boolval = False

        name = argmap[opt]

        obj = defmap[name]

        t = type(obj)

        if callable(obj):

            state[name] = defmap[name](val)

        elif t is type(1):

            try:

                state[name] = int(val)

            except ValueError:

                raise error.Abort(_('invalid value %r for option %s, '

                                   'expected int') % (val, opt))

        elif t is type(''):

            state[name] = val

        elif t is type([]):

            state[name].append(val)

        elif t is type(None) or t is type(False):

            state[name] = boolval

    # return unparsed args

    return args