| 1 | """ CommandLine - Get and parse command line options
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| 2 |
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| 3 | NOTE: This still is very much work in progress !!!
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| 4 |
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| 5 | Different version are likely to be incompatible.
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| 6 |
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| 7 | TODO:
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| 8 |
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| 9 | * Incorporate the changes made by (see Inbox)
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| 10 | * Add number range option using srange()
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| 11 |
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| 12 | """
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| 13 |
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| 14 | __copyright__ = """\
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| 15 | Copyright (c), 1997-2006, Marc-Andre Lemburg (mal@lemburg.com)
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| 16 | Copyright (c), 2000-2006, eGenix.com Software GmbH (info@egenix.com)
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| 17 | See the documentation for further information on copyrights,
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| 18 | or contact the author. All Rights Reserved.
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| 19 | """
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| 20 |
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| 21 | __version__ = '1.2'
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| 22 |
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| 23 | import sys, getopt, string, glob, os, re, exceptions, traceback
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| 24 |
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| 25 | ### Helpers
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| 26 |
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| 27 | def _getopt_flags(options):
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| 28 |
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| 29 | """ Convert the option list to a getopt flag string and long opt
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| 30 | list
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| 31 |
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| 32 | """
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| 33 | s = []
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| 34 | l = []
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| 35 | for o in options:
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| 36 | if o.prefix == '-':
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| 37 | # short option
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| 38 | s.append(o.name)
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| 39 | if o.takes_argument:
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| 40 | s.append(':')
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| 41 | else:
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| 42 | # long option
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| 43 | if o.takes_argument:
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| 44 | l.append(o.name+'=')
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| 45 | else:
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| 46 | l.append(o.name)
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| 47 | return string.join(s,''),l
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| 48 |
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| 49 | def invisible_input(prompt='>>> '):
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| 50 |
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| 51 | """ Get raw input from a terminal without echoing the characters to
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| 52 | the terminal, e.g. for password queries.
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| 53 |
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| 54 | """
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| 55 | import getpass
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| 56 | entry = getpass.getpass(prompt)
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| 57 | if entry is None:
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| 58 | raise KeyboardInterrupt
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| 59 | return entry
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| 60 |
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| 61 | def fileopen(name, mode='wb', encoding=None):
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| 62 |
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| 63 | """ Open a file using mode.
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| 64 |
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| 65 | Default mode is 'wb' meaning to open the file for writing in
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| 66 | binary mode. If encoding is given, I/O to and from the file is
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| 67 | transparently encoded using the given encoding.
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| 68 |
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| 69 | Files opened for writing are chmod()ed to 0600.
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| 70 |
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| 71 | """
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| 72 | if name == 'stdout':
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| 73 | return sys.stdout
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| 74 | elif name == 'stderr':
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| 75 | return sys.stderr
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| 76 | elif name == 'stdin':
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| 77 | return sys.stdin
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| 78 | else:
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| 79 | if encoding is not None:
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| 80 | import codecs
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| 81 | f = codecs.open(name, mode, encoding)
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| 82 | else:
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| 83 | f = open(name, mode)
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| 84 | if 'w' in mode:
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| 85 | os.chmod(name, 0600)
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| 86 | return f
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| 87 |
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| 88 | def option_dict(options):
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| 89 |
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| 90 | """ Return a dictionary mapping option names to Option instances.
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| 91 | """
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| 92 | d = {}
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| 93 | for option in options:
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| 94 | d[option.name] = option
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| 95 | return d
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| 96 |
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| 97 | # Alias
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| 98 | getpasswd = invisible_input
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| 99 |
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| 100 | _integerRE = re.compile('\s*(-?\d+)\s*$')
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| 101 | _integerRangeRE = re.compile('\s*(-?\d+)\s*-\s*(-?\d+)\s*$')
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| 102 |
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| 103 | def srange(s,
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| 104 |
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| 105 | split=string.split,integer=_integerRE,
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| 106 | integerRange=_integerRangeRE):
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| 107 |
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| 108 | """ Converts a textual representation of integer numbers and ranges
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| 109 | to a Python list.
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| 110 |
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| 111 | Supported formats: 2,3,4,2-10,-1 - -3, 5 - -2
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| 112 |
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| 113 | Values are appended to the created list in the order specified
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| 114 | in the string.
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| 115 |
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| 116 | """
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| 117 | l = []
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| 118 | append = l.append
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| 119 | for entry in split(s,','):
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| 120 | m = integer.match(entry)
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| 121 | if m:
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| 122 | append(int(m.groups()[0]))
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| 123 | continue
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| 124 | m = integerRange.match(entry)
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| 125 | if m:
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| 126 | start,end = map(int,m.groups())
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| 127 | l[len(l):] = range(start,end+1)
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| 128 | return l
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| 129 |
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| 130 | def abspath(path,
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| 131 |
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| 132 | expandvars=os.path.expandvars,expanduser=os.path.expanduser,
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| 133 | join=os.path.join,getcwd=os.getcwd):
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| 134 |
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| 135 | """ Return the corresponding absolute path for path.
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| 136 |
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| 137 | path is expanded in the usual shell ways before
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| 138 | joining it with the current working directory.
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| 139 |
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| 140 | """
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| 141 | try:
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| 142 | path = expandvars(path)
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| 143 | except AttributeError:
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| 144 | pass
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| 145 | try:
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| 146 | path = expanduser(path)
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| 147 | except AttributeError:
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| 148 | pass
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| 149 | return join(getcwd(), path)
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| 150 |
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| 151 | ### Option classes
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| 152 |
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| 153 | class Option:
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| 154 |
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| 155 | """ Option base class. Takes no argument.
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| 156 |
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| 157 | """
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| 158 | default = None
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| 159 | helptext = ''
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| 160 | prefix = '-'
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| 161 | takes_argument = 0
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| 162 | has_default = 0
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| 163 | tab = 15
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| 164 |
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| 165 | def __init__(self,name,help=None):
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| 166 |
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| 167 | if not name[:1] == '-':
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| 168 | raise TypeError,'option names must start with "-"'
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| 169 | if name[1:2] == '-':
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| 170 | self.prefix = '--'
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| 171 | self.name = name[2:]
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| 172 | else:
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| 173 | self.name = name[1:]
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| 174 | if help:
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| 175 | self.help = help
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| 176 |
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| 177 | def __str__(self):
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| 178 |
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| 179 | o = self
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| 180 | name = o.prefix + o.name
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| 181 | if o.takes_argument:
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| 182 | name = name + ' arg'
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| 183 | if len(name) > self.tab:
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| 184 | name = name + '\n' + ' ' * (self.tab + 1 + len(o.prefix))
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| 185 | else:
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| 186 | name = '%-*s ' % (self.tab, name)
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| 187 | description = o.help
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| 188 | if o.has_default:
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| 189 | description = description + ' (%s)' % o.default
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| 190 | return '%s %s' % (name, description)
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| 191 |
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| 192 | class ArgumentOption(Option):
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| 193 |
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| 194 | """ Option that takes an argument.
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| 195 |
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| 196 | An optional default argument can be given.
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| 197 |
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| 198 | """
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| 199 | def __init__(self,name,help=None,default=None):
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| 200 |
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| 201 | # Basemethod
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| 202 | Option.__init__(self,name,help)
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| 203 |
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| 204 | if default is not None:
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| 205 | self.default = default
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| 206 | self.has_default = 1
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| 207 | self.takes_argument = 1
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| 208 |
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| 209 | class SwitchOption(Option):
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| 210 |
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| 211 | """ Options that can be on or off. Has an optional default value.
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| 212 |
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| 213 | """
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| 214 | def __init__(self,name,help=None,default=None):
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| 215 |
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| 216 | # Basemethod
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| 217 | Option.__init__(self,name,help)
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| 218 |
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| 219 | if default is not None:
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| 220 | self.default = default
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| 221 | self.has_default = 1
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| 222 |
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| 223 | ### Application baseclass
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| 224 |
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| 225 | class Application:
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| 226 |
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| 227 | """ Command line application interface with builtin argument
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| 228 | parsing.
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| 229 |
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| 230 | """
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| 231 | # Options the program accepts (Option instances)
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| 232 | options = []
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| 233 |
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| 234 | # Standard settings; these are appended to options in __init__
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| 235 | preset_options = [SwitchOption('-v',
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| 236 | 'generate verbose output'),
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| 237 | SwitchOption('-h',
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| 238 | 'show this help text'),
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| 239 | SwitchOption('--help',
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| 240 | 'show this help text'),
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| 241 | SwitchOption('--debug',
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| 242 | 'enable debugging'),
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| 243 | SwitchOption('--copyright',
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| 244 | 'show copyright'),
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| 245 | SwitchOption('--examples',
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| 246 | 'show examples of usage')]
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| 247 |
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| 248 | # The help layout looks like this:
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| 249 | # [header] - defaults to ''
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| 250 | #
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| 251 | # [synopsis] - formatted as '<self.name> %s' % self.synopsis
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| 252 | #
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| 253 | # options:
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| 254 | # [options] - formatted from self.options
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| 255 | #
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| 256 | # [version] - formatted as 'Version:\n %s' % self.version, if given
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| 257 | #
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| 258 | # [about] - defaults to ''
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| 259 | #
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| 260 | # Note: all fields that do not behave as template are formatted
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| 261 | # using the instances dictionary as substitution namespace,
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| 262 | # e.g. %(name)s will be replaced by the applications name.
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| 263 | #
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| 264 |
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| 265 | # Header (default to program name)
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| 266 | header = ''
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| 267 |
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| 268 | # Name (defaults to program name)
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| 269 | name = ''
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| 270 |
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| 271 | # Synopsis (%(name)s is replaced by the program name)
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| 272 | synopsis = '%(name)s [option] files...'
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| 273 |
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| 274 | # Version (optional)
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| 275 | version = ''
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| 276 |
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| 277 | # General information printed after the possible options (optional)
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| 278 | about = ''
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| 279 |
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| 280 | # Examples of usage to show when the --examples option is given (optional)
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| 281 | examples = ''
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| 282 |
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| 283 | # Copyright to show
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| 284 | copyright = __copyright__
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| 285 |
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| 286 | # Apply file globbing ?
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| 287 | globbing = 1
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| 288 |
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| 289 | # Generate debug output ?
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| 290 | debug = 0
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| 291 |
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| 292 | # Generate verbose output ?
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| 293 | verbose = 0
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| 294 |
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| 295 | # Internal errors to catch
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| 296 | InternalError = exceptions.Exception
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| 297 |
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| 298 | # Instance variables:
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| 299 | values = None # Dictionary of passed options (or default values)
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| 300 | # indexed by the options name, e.g. '-h'
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| 301 | files = None # List of passed filenames
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| 302 | optionlist = None # List of passed options
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| 303 |
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| 304 | def __init__(self,argv=None):
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| 305 |
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| 306 | # Setup application specs
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| 307 | if argv is None:
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| 308 | argv = sys.argv
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| 309 | self.filename = os.path.split(argv[0])[1]
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| 310 | if not self.name:
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| 311 | self.name = os.path.split(self.filename)[1]
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| 312 | else:
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| 313 | self.name = self.name
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| 314 | if not self.header:
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| 315 | self.header = self.name
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| 316 | else:
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| 317 | self.header = self.header
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| 318 |
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| 319 | # Init .arguments list
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| 320 | self.arguments = argv[1:]
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| 321 |
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| 322 | # Setup Option mapping
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| 323 | self.option_map = option_dict(self.options)
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| 324 |
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| 325 | # Append preset options
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| 326 | for option in self.preset_options:
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| 327 | if not self.option_map.has_key(option.name):
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| 328 | self.add_option(option)
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| 329 |
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| 330 | # Init .files list
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| 331 | self.files = []
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| 332 |
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| 333 | # Start Application
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| 334 | try:
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| 335 | # Process startup
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| 336 | rc = self.startup()
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| 337 | if rc is not None:
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| 338 | raise SystemExit,rc
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| 339 |
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| 340 | # Parse command line
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| 341 | rc = self.parse()
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| 342 | if rc is not None:
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| 343 | raise SystemExit,rc
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| 344 |
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| 345 | # Start application
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| 346 | rc = self.main()
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| 347 | if rc is None:
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| 348 | rc = 0
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| 349 |
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| 350 | except SystemExit,rc:
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| 351 | pass
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| 352 |
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| 353 | except KeyboardInterrupt:
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| 354 | print
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| 355 | print '* User Break'
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| 356 | print
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| 357 | rc = 1
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| 358 |
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| 359 | except self.InternalError:
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| 360 | print
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| 361 | print '* Internal Error (use --debug to display the traceback)'
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| 362 | if self.debug:
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| 363 | print
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| 364 | traceback.print_exc(20, sys.stdout)
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| 365 | elif self.verbose:
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| 366 | print ' %s: %s' % sys.exc_info()[:2]
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| 367 | print
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| 368 | rc = 1
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| 369 |
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| 370 | raise SystemExit,rc
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| 371 |
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| 372 | def add_option(self, option):
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| 373 |
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| 374 | """ Add a new Option instance to the Application dynamically.
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| 375 |
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| 376 | Note that this has to be done *before* .parse() is being
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| 377 | executed.
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| 378 |
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| 379 | """
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| 380 | self.options.append(option)
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| 381 | self.option_map[option.name] = option
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| 382 |
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| 383 | def startup(self):
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| 384 |
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| 385 | """ Set user defined instance variables.
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| 386 |
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| 387 | If this method returns anything other than None, the
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| 388 | process is terminated with the return value as exit code.
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| 389 |
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| 390 | """
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| 391 | return None
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| 392 |
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| 393 | def exit(self, rc=0):
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| 394 |
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| 395 | """ Exit the program.
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| 396 |
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| 397 | rc is used as exit code and passed back to the calling
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| 398 | program. It defaults to 0 which usually means: OK.
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| 399 |
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| 400 | """
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| 401 | raise SystemExit, rc
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| 402 |
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| 403 | def parse(self):
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| 404 |
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| 405 | """ Parse the command line and fill in self.values and self.files.
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| 406 |
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| 407 | After having parsed the options, the remaining command line
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| 408 | arguments are interpreted as files and passed to .handle_files()
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| 409 | for processing.
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| 410 |
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| 411 | As final step the option handlers are called in the order
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| 412 | of the options given on the command line.
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| 413 |
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| 414 | """
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| 415 | # Parse arguments
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| 416 | self.values = values = {}
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| 417 | for o in self.options:
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| 418 | if o.has_default:
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| 419 | values[o.prefix+o.name] = o.default
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| 420 | else:
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| 421 | values[o.prefix+o.name] = 0
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| 422 | flags,lflags = _getopt_flags(self.options)
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| 423 | try:
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| 424 | optlist,files = getopt.getopt(self.arguments,flags,lflags)
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| 425 | if self.globbing:
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| 426 | l = []
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| 427 | for f in files:
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| 428 | gf = glob.glob(f)
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| 429 | if not gf:
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| 430 | l.append(f)
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| 431 | else:
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| 432 | l[len(l):] = gf
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| 433 | files = l
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| 434 | self.optionlist = optlist
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| 435 | self.files = files + self.files
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| 436 | except getopt.error,why:
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| 437 | self.help(why)
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| 438 | sys.exit(1)
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| 439 |
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| 440 | # Call file handler
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| 441 | rc = self.handle_files(self.files)
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| 442 | if rc is not None:
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| 443 | sys.exit(rc)
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| 444 |
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| 445 | # Call option handlers
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| 446 | for optionname, value in optlist:
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| 447 |
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| 448 | # Try to convert value to integer
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| 449 | try:
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| 450 | value = string.atoi(value)
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| 451 | except ValueError:
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| 452 | pass
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| 453 |
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| 454 | # Find handler and call it (or count the number of option
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| 455 | # instances on the command line)
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| 456 | handlername = 'handle' + string.replace(optionname, '-', '_')
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| 457 | try:
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| 458 | handler = getattr(self, handlername)
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| 459 | except AttributeError:
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| 460 | if value == '':
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| 461 | # count the number of occurances
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| 462 | if values.has_key(optionname):
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| 463 | values[optionname] = values[optionname] + 1
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| 464 | else:
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| 465 | values[optionname] = 1
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| 466 | else:
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| 467 | values[optionname] = value
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| 468 | else:
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| 469 | rc = handler(value)
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|---|
| 470 | if rc is not None:
|
|---|
| 471 | raise SystemExit, rc
|
|---|
| 472 |
|
|---|
| 473 | # Apply final file check (for backward compatibility)
|
|---|
| 474 | rc = self.check_files(self.files)
|
|---|
| 475 | if rc is not None:
|
|---|
| 476 | sys.exit(rc)
|
|---|
| 477 |
|
|---|
| 478 | def check_files(self,filelist):
|
|---|
| 479 |
|
|---|
| 480 | """ Apply some user defined checks on the files given in filelist.
|
|---|
| 481 |
|
|---|
| 482 | This may modify filelist in place. A typical application
|
|---|
| 483 | is checking that at least n files are given.
|
|---|
| 484 |
|
|---|
| 485 | If this method returns anything other than None, the
|
|---|
| 486 | process is terminated with the return value as exit code.
|
|---|
| 487 |
|
|---|
| 488 | """
|
|---|
| 489 | return None
|
|---|
| 490 |
|
|---|
| 491 | def help(self,note=''):
|
|---|
| 492 |
|
|---|
| 493 | self.print_header()
|
|---|
| 494 | if self.synopsis:
|
|---|
| 495 | print 'Synopsis:'
|
|---|
| 496 | # To remain backward compatible:
|
|---|
| 497 | try:
|
|---|
| 498 | synopsis = self.synopsis % self.name
|
|---|
| 499 | except (NameError, KeyError, TypeError):
|
|---|
| 500 | synopsis = self.synopsis % self.__dict__
|
|---|
| 501 | print ' ' + synopsis
|
|---|
| 502 | print
|
|---|
| 503 | self.print_options()
|
|---|
| 504 | if self.version:
|
|---|
| 505 | print 'Version:'
|
|---|
| 506 | print ' %s' % self.version
|
|---|
| 507 | print
|
|---|
| 508 | if self.about:
|
|---|
| 509 | print string.strip(self.about % self.__dict__)
|
|---|
| 510 | print
|
|---|
| 511 | if note:
|
|---|
| 512 | print '-'*72
|
|---|
| 513 | print 'Note:',note
|
|---|
| 514 | print
|
|---|
| 515 |
|
|---|
| 516 | def notice(self,note):
|
|---|
| 517 |
|
|---|
| 518 | print '-'*72
|
|---|
| 519 | print 'Note:',note
|
|---|
| 520 | print '-'*72
|
|---|
| 521 | print
|
|---|
| 522 |
|
|---|
| 523 | def print_header(self):
|
|---|
| 524 |
|
|---|
| 525 | print '-'*72
|
|---|
| 526 | print self.header % self.__dict__
|
|---|
| 527 | print '-'*72
|
|---|
| 528 | print
|
|---|
| 529 |
|
|---|
| 530 | def print_options(self):
|
|---|
| 531 |
|
|---|
| 532 | options = self.options
|
|---|
| 533 | print 'Options and default settings:'
|
|---|
| 534 | if not options:
|
|---|
| 535 | print ' None'
|
|---|
| 536 | return
|
|---|
| 537 | long = filter(lambda x: x.prefix == '--', options)
|
|---|
| 538 | short = filter(lambda x: x.prefix == '-', options)
|
|---|
| 539 | items = short + long
|
|---|
| 540 | for o in options:
|
|---|
| 541 | print ' ',o
|
|---|
| 542 | print
|
|---|
| 543 |
|
|---|
| 544 | #
|
|---|
| 545 | # Example handlers:
|
|---|
| 546 | #
|
|---|
| 547 | # If a handler returns anything other than None, processing stops
|
|---|
| 548 | # and the return value is passed to sys.exit() as argument.
|
|---|
| 549 | #
|
|---|
| 550 |
|
|---|
| 551 | # File handler
|
|---|
| 552 | def handle_files(self,files):
|
|---|
| 553 |
|
|---|
| 554 | """ This may process the files list in place.
|
|---|
| 555 | """
|
|---|
| 556 | return None
|
|---|
| 557 |
|
|---|
| 558 | # Short option handler
|
|---|
| 559 | def handle_h(self,arg):
|
|---|
| 560 |
|
|---|
| 561 | self.help()
|
|---|
| 562 | return 0
|
|---|
| 563 |
|
|---|
| 564 | def handle_v(self, value):
|
|---|
| 565 |
|
|---|
| 566 | """ Turn on verbose output.
|
|---|
| 567 | """
|
|---|
| 568 | self.verbose = 1
|
|---|
| 569 |
|
|---|
| 570 | # Handlers for long options have two underscores in their name
|
|---|
| 571 | def handle__help(self,arg):
|
|---|
| 572 |
|
|---|
| 573 | self.help()
|
|---|
| 574 | return 0
|
|---|
| 575 |
|
|---|
| 576 | def handle__debug(self,arg):
|
|---|
| 577 |
|
|---|
| 578 | self.debug = 1
|
|---|
| 579 | # We don't want to catch internal errors:
|
|---|
| 580 | self.InternalError = None
|
|---|
| 581 |
|
|---|
| 582 | def handle__copyright(self,arg):
|
|---|
| 583 |
|
|---|
| 584 | self.print_header()
|
|---|
| 585 | print string.strip(self.copyright % self.__dict__)
|
|---|
| 586 | print
|
|---|
| 587 | return 0
|
|---|
| 588 |
|
|---|
| 589 | def handle__examples(self,arg):
|
|---|
| 590 |
|
|---|
| 591 | self.print_header()
|
|---|
| 592 | if self.examples:
|
|---|
| 593 | print 'Examples:'
|
|---|
| 594 | print
|
|---|
| 595 | print string.strip(self.examples % self.__dict__)
|
|---|
| 596 | print
|
|---|
| 597 | else:
|
|---|
| 598 | print 'No examples available.'
|
|---|
| 599 | print
|
|---|
| 600 | return 0
|
|---|
| 601 |
|
|---|
| 602 | def main(self):
|
|---|
| 603 |
|
|---|
| 604 | """ Override this method as program entry point.
|
|---|
| 605 |
|
|---|
| 606 | The return value is passed to sys.exit() as argument. If
|
|---|
| 607 | it is None, 0 is assumed (meaning OK). Unhandled
|
|---|
| 608 | exceptions are reported with exit status code 1 (see
|
|---|
| 609 | __init__ for further details).
|
|---|
| 610 |
|
|---|
| 611 | """
|
|---|
| 612 | return None
|
|---|
| 613 |
|
|---|
| 614 | # Alias
|
|---|
| 615 | CommandLine = Application
|
|---|
| 616 |
|
|---|
| 617 | def _test():
|
|---|
| 618 |
|
|---|
| 619 | class MyApplication(Application):
|
|---|
| 620 | header = 'Test Application'
|
|---|
| 621 | version = __version__
|
|---|
| 622 | options = [Option('-v','verbose')]
|
|---|
| 623 |
|
|---|
| 624 | def handle_v(self,arg):
|
|---|
| 625 | print 'VERBOSE, Yeah !'
|
|---|
| 626 |
|
|---|
| 627 | cmd = MyApplication()
|
|---|
| 628 | if not cmd.values['-h']:
|
|---|
| 629 | cmd.help()
|
|---|
| 630 | print 'files:',cmd.files
|
|---|
| 631 | print 'Bye...'
|
|---|
| 632 |
|
|---|
| 633 | if __name__ == '__main__':
|
|---|
| 634 | _test()
|
|---|
