Mercurial > hg > CommandParser
annotate commandparser/command.py @ 11:03db23600c1f
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| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Mon, 02 Apr 2012 10:42:13 -0700 |
| parents | a3599e4db9a4 |
| children | e0a3148e67a8 |
| rev | line source |
|---|---|
| 1 | 1 """ |
| 2 a command-line interface to the command line, a la pythonpaste | |
| 3 """ | |
| 4 | |
| 5 import inspect | |
| 6 import os | |
| 7 import sys | |
| 8 from optparse import OptionParser | |
| 9 from pprint import pprint | |
| 10 | |
| 9 | 11 try: |
| 12 import json | |
| 13 except ImportError: | |
| 14 import simplejson as json | |
| 15 | |
| 10 | 16 # BBB python 2.4 |
| 17 cleandoc = getattr(inspect, 'cleandoc', lambda x: x.strip()) | |
| 18 | |
|
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19 __all__ = ['Undefined', 'CommandParser'] |
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20 |
| 1 | 21 class Undefined(object): |
| 9 | 22 def __init__(self, default): |
| 23 self.default=default | |
| 1 | 24 |
| 25 class CommandParser(OptionParser): | |
| 26 # TODO: add `help` command | |
| 27 | |
| 28 def __init__(self, _class, description=None): | |
| 29 self._class = _class | |
| 30 self.commands = {} | |
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31 init = self.command(_class.__init__) |
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32 self.init_args = init['args'] |
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33 command_str = ' '.join(self.init_args + ['command']) |
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34 usage = '%prog [options]' + ' %s [command-options]' % (command_str) |
| 1 | 35 description = description or _class.__doc__ |
| 36 OptionParser.__init__(self, usage=usage, description=description) | |
| 37 commands = [ getattr(_class, i) for i in dir(_class) | |
| 38 if not i.startswith('_') ] | |
| 39 commands = [ method for method in commands | |
| 40 if hasattr(method, '__call__') ] | |
| 41 for _command in commands: | |
| 42 c = self.command(_command) | |
| 43 self.commands[c['name']] = c | |
| 44 | |
| 45 # get class options | |
| 46 self.command2parser(init, self) | |
| 47 self.disable_interspersed_args() | |
| 48 | |
| 49 def add_option(self, *args, **kwargs): | |
| 50 kwargs['default'] = Undefined(kwargs.get('default')) | |
| 51 OptionParser.add_option(self, *args, **kwargs) | |
| 52 | |
| 53 def print_help(self): | |
| 3 | 54 |
| 1 | 55 OptionParser.print_help(self) |
| 3 | 56 |
| 1 | 57 # short descriptions for commands |
| 58 command_descriptions = [dict(name=i, | |
| 59 description=self.commands[i]['doc'].strip().split('\n',1)[0]) | |
| 60 for i in self.commands.keys()] | |
| 61 command_descriptions.append(dict(name='help', description='print help for a given command')) | |
| 62 command_descriptions.sort(key=lambda x: x['name']) | |
| 63 max_len = max([len(i['name']) for i in command_descriptions]) | |
| 64 description = "Commands: \n%s" % ('\n'.join([' %s%s %s' % (description['name'], ' ' * (max_len - len(description['name'])), description['description']) | |
| 65 for description in command_descriptions])) | |
| 66 | |
| 67 print | |
| 68 print description | |
| 69 | |
| 70 def parse(self, args=sys.argv[1:]): | |
| 71 """global parse step""" | |
| 3 | 72 |
| 1 | 73 self.options, args = self.parse_args(args) |
| 74 | |
| 75 # help/sanity check -- should probably be separated | |
| 76 if not len(args): | |
| 77 self.print_help() | |
| 78 sys.exit(0) | |
| 79 if args[0] == 'help': | |
| 80 if len(args) == 2: | |
| 81 if args[1] == 'help': | |
| 82 self.print_help() | |
| 83 elif args[1] in self.commands: | |
| 84 name = args[1] | |
| 85 commandparser = self.command2parser(name) | |
| 86 commandparser.print_help() | |
| 87 else: | |
| 88 self.error("No command '%s'" % args[1]) | |
| 89 else: | |
| 90 self.print_help() | |
| 91 sys.exit(0) | |
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92 required = len(self.init_args) + 1 # command |
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93 if len(args) < required: |
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94 self.print_usage() |
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95 sys.exit(1) |
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96 self.command_args = args[:len(self.init_args)] |
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97 args = args[len(self.init_args):] |
| 1 | 98 command = args[0] |
| 99 if command not in self.commands: | |
| 100 self.error("No command '%s'" % command) | |
| 101 return command, args[1:] | |
| 102 | |
| 103 def invoke(self, args=sys.argv[1:]): | |
| 104 """ | |
| 105 invoke | |
| 106 """ | |
| 107 | |
| 108 # parse | |
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109 name, args = self.parse(args) |
| 1 | 110 |
| 111 # setup | |
| 112 options = {} | |
| 113 dotfile = os.path.join(os.environ['HOME'], '.' + self.get_prog_name()) | |
| 114 if os.path.exists(dotfile): | |
| 115 f = file(dotfile) | |
| 116 for line in f.readlines(): | |
| 117 line = line.strip() | |
| 118 if not line: | |
| 119 continue | |
| 120 if ':' in line: | |
| 121 key, value = [i.strip() | |
| 122 for i in line.split(':', 1)] | |
| 123 options[key] = value | |
| 124 else: | |
| 125 print >> sys.stderr, "Bad option line: " + line | |
| 126 for key, value in self.options.__dict__.items(): | |
| 127 if isinstance(value, Undefined): | |
| 128 if key in options: | |
| 129 continue | |
| 130 options[key] = value.default | |
| 131 else: | |
| 132 options[key] = value | |
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133 _object = self._class(*self.command_args, **options) |
| 1 | 134 |
| 135 # command specific args | |
| 136 command = self.commands[name] | |
| 137 commandparser = self.command2parser(name) | |
| 138 command_options, command_args = commandparser.parse_args(args) | |
| 139 if len(command_args) < len(command['args']): | |
| 140 commandparser.error("Not enough arguments given") | |
| 141 if len(command_args) != len(command['args']) and not command['varargs']: | |
| 142 commandparser.error("Too many arguments given") | |
| 143 | |
| 144 # invoke the command | |
| 145 retval = getattr(_object, name)(*command_args, **command_options.__dict__) | |
| 146 if isinstance(retval, basestring): | |
| 147 print retval | |
| 148 elif retval is None: | |
| 149 pass | |
| 150 elif isinstance(retval, list): | |
| 151 for i in retval: | |
| 152 print i | |
| 153 elif isinstance(retval, dict): | |
| 154 try: | |
| 155 print json.dumps(retval, indent=2, sort_keys=True) | |
| 156 except: | |
| 157 pprint(retval) | |
| 158 else: | |
| 159 pprint(retval) | |
| 160 return retval | |
| 161 | |
| 162 def command(self, function): | |
| 163 name = function.func_name | |
| 164 if function.__doc__: | |
| 10 | 165 doc = cleandoc(function.__doc__) |
| 1 | 166 else: |
| 167 doc = '' | |
| 10 | 168 args, varargs, varkw, defaults = inspect.getargspec(function) |
| 1 | 169 if defaults: |
| 10 | 170 args = args[1:-len(defaults)] |
| 171 optional = dict(zip(args[-len(defaults):], defaults)) | |
| 1 | 172 else: |
| 10 | 173 args = args[1:] |
| 1 | 174 optional = None |
| 5 | 175 command = {'doc': doc, |
| 176 'name': name, | |
| 177 'args': args, | |
| 178 'optional': optional, | |
| 10 | 179 'varargs': varargs |
| 5 | 180 } |
| 1 | 181 return command |
| 182 | |
| 183 def commandargs2str(self, command): | |
| 184 if isinstance(command, basestring): | |
| 185 command = self.commands[command] | |
| 186 retval = [] | |
| 187 retval.extend(['<%s>' % arg for arg in command['args']]) | |
| 188 varargs = command['varargs'] | |
| 189 if varargs: | |
| 190 retval.append('<%s> [%s] [...]' % (varargs, varargs)) | |
| 191 if command['optional']: | |
| 192 retval.append('[options]') | |
| 193 return ' '.join(retval) | |
| 194 | |
| 195 def doc2arghelp(self, docstring, decoration='-', delimeter=':'): | |
| 196 """ | |
| 197 Parse a docstring and get at the section describing arguments | |
| 198 - decoration: decoration character | |
| 199 - delimeter: delimter character | |
| 3 | 200 |
| 1 | 201 Yields a tuple of the stripped docstring and the arguments help |
| 202 dictionary | |
| 203 """ | |
| 204 lines = [ i.strip() for i in docstring.split('\n') ] | |
| 205 argdict = {} | |
| 206 doc = [] | |
| 207 option = None | |
| 208 for line in lines: | |
| 209 if not line and option: # blank lines terminate [?] | |
| 210 break | |
| 211 if line.startswith(decoration) and delimeter in line: | |
| 212 name, description = line.split(delimeter, 1) | |
| 213 name = name.lstrip(decoration).strip() | |
| 214 description = description.strip() | |
| 215 argdict[name] = [ description ] | |
| 216 option = name | |
| 217 else: | |
| 218 if option: | |
| 219 argdict[name].append(line) | |
| 220 else: | |
| 221 doc.append(line) | |
| 222 argdict = dict([(key, ' '.join(value)) | |
| 223 for key, value in argdict.items()]) | |
| 224 return ('\n'.join(doc), argdict) | |
| 225 | |
| 226 def command2parser(self, command, parser=None): | |
| 227 if isinstance(command, basestring): | |
| 228 command = self.commands[command] | |
| 229 doc, argdict = self.doc2arghelp(command['doc']) | |
| 230 if parser is None: | |
| 231 parser = OptionParser('%%prog %s %s' % (command['name'], self.commandargs2str(command)), | |
| 232 description=doc, add_help_option=False) | |
| 233 if command['optional']: | |
| 234 for key, value in command['optional'].items(): | |
| 235 help = argdict.get(key, '') | |
| 236 if value is True: | |
| 237 parser.add_option('--no-%s' % key, dest=key, | |
| 238 action='store_false', default=True, | |
| 239 help=help) | |
| 240 elif value is False: | |
| 241 parser.add_option('--%s' % key, action='store_true', | |
| 242 default=False, help=help) | |
| 4 | 243 elif isinstance(value, int): |
| 244 help += ' [DEFAULT: %s]' % value | |
| 245 parser.add_option('--%s' % key, help=help, | |
| 246 type='int', default=value) | |
| 1 | 247 elif type(value) in set([type(()), type([])]): |
| 248 if value: | |
| 249 help += ' [DEFAULT: %s]' % value | |
| 250 parser.add_option('--%s' % key, action='append', | |
| 251 default=list(value), | |
| 252 help=help) | |
| 253 else: | |
| 254 if value is not None: | |
| 255 help += ' [DEFAULT: %s]' % value | |
| 256 parser.add_option('--%s' % key, help=help, default=value) | |
| 3 | 257 |
| 1 | 258 return parser |