Mercurial > hg > CommandParser
annotate commandparser/command.py @ 5:005e073dc590
basic POC
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Fri, 30 Mar 2012 09:53:58 -0700 |
| parents | 5f31e56eebb6 |
| children | 109627b7db9f |
| rev | line source |
|---|---|
| 1 | 1 """ |
| 2 a command-line interface to the command line, a la pythonpaste | |
| 3 """ | |
| 4 | |
| 5 import inspect | |
| 6 import json | |
| 7 import os | |
| 8 import sys | |
| 9 from optparse import OptionParser | |
| 10 from pprint import pprint | |
| 11 | |
|
2
d36032625794
add __all__ and whitespace cleanup
Jeff Hammel <jhammel@mozilla.com>
parents:
1
diff
changeset
|
12 __all__ = ['Undefined', 'CommandParser'] |
|
d36032625794
add __all__ and whitespace cleanup
Jeff Hammel <jhammel@mozilla.com>
parents:
1
diff
changeset
|
13 |
| 1 | 14 class Undefined(object): |
| 15 def __init__(self, default): | |
| 16 self.default=default | |
| 17 | |
| 18 class CommandParser(OptionParser): | |
| 19 # TODO: add `help` command | |
| 20 | |
| 21 def __init__(self, _class, description=None): | |
| 22 self._class = _class | |
| 23 self.commands = {} | |
| 24 usage = '%prog [options] command [command-options]' | |
| 25 description = description or _class.__doc__ | |
| 26 OptionParser.__init__(self, usage=usage, description=description) | |
| 27 commands = [ getattr(_class, i) for i in dir(_class) | |
| 28 if not i.startswith('_') ] | |
| 29 commands = [ method for method in commands | |
| 30 if hasattr(method, '__call__') ] | |
| 31 for _command in commands: | |
| 32 c = self.command(_command) | |
| 33 self.commands[c['name']] = c | |
| 34 | |
| 35 # get class options | |
| 36 init = self.command(_class.__init__) | |
| 37 self.command2parser(init, self) | |
| 38 | |
| 39 self.disable_interspersed_args() | |
| 40 | |
| 41 def add_option(self, *args, **kwargs): | |
| 42 kwargs['default'] = Undefined(kwargs.get('default')) | |
| 43 OptionParser.add_option(self, *args, **kwargs) | |
| 44 | |
| 45 def print_help(self): | |
| 3 | 46 |
| 1 | 47 OptionParser.print_help(self) |
| 3 | 48 |
| 1 | 49 # short descriptions for commands |
| 50 command_descriptions = [dict(name=i, | |
| 51 description=self.commands[i]['doc'].strip().split('\n',1)[0]) | |
| 52 for i in self.commands.keys()] | |
| 53 command_descriptions.append(dict(name='help', description='print help for a given command')) | |
| 54 command_descriptions.sort(key=lambda x: x['name']) | |
| 55 max_len = max([len(i['name']) for i in command_descriptions]) | |
| 56 description = "Commands: \n%s" % ('\n'.join([' %s%s %s' % (description['name'], ' ' * (max_len - len(description['name'])), description['description']) | |
| 57 for description in command_descriptions])) | |
| 58 | |
| 59 print | |
| 60 print description | |
| 61 | |
| 62 def parse(self, args=sys.argv[1:]): | |
| 63 """global parse step""" | |
| 3 | 64 |
| 1 | 65 self.options, args = self.parse_args(args) |
| 66 | |
| 67 # help/sanity check -- should probably be separated | |
| 68 if not len(args): | |
| 69 self.print_help() | |
| 70 sys.exit(0) | |
| 71 if args[0] == 'help': | |
| 72 if len(args) == 2: | |
| 73 if args[1] == 'help': | |
| 74 self.print_help() | |
| 75 elif args[1] in self.commands: | |
| 76 name = args[1] | |
| 77 commandparser = self.command2parser(name) | |
| 78 commandparser.print_help() | |
| 79 else: | |
| 80 self.error("No command '%s'" % args[1]) | |
| 81 else: | |
| 82 self.print_help() | |
| 83 sys.exit(0) | |
| 84 command = args[0] | |
| 85 if command not in self.commands: | |
| 86 self.error("No command '%s'" % command) | |
| 87 return command, args[1:] | |
| 88 | |
| 89 def invoke(self, args=sys.argv[1:]): | |
| 90 """ | |
| 91 invoke | |
| 92 """ | |
| 93 | |
| 94 # parse | |
| 95 name, args = self.parse(args) | |
| 96 | |
| 97 # setup | |
| 98 options = {} | |
| 99 dotfile = os.path.join(os.environ['HOME'], '.' + self.get_prog_name()) | |
| 100 if os.path.exists(dotfile): | |
| 101 f = file(dotfile) | |
| 102 for line in f.readlines(): | |
| 103 line = line.strip() | |
| 104 if not line: | |
| 105 continue | |
| 106 if ':' in line: | |
| 107 key, value = [i.strip() | |
| 108 for i in line.split(':', 1)] | |
| 109 options[key] = value | |
| 110 else: | |
| 111 print >> sys.stderr, "Bad option line: " + line | |
| 112 for key, value in self.options.__dict__.items(): | |
| 113 if isinstance(value, Undefined): | |
| 114 if key in options: | |
| 115 continue | |
| 116 options[key] = value.default | |
| 117 else: | |
| 118 options[key] = value | |
| 119 _object = self._class(**options) | |
| 120 | |
| 121 # command specific args | |
| 122 command = self.commands[name] | |
| 123 commandparser = self.command2parser(name) | |
| 124 command_options, command_args = commandparser.parse_args(args) | |
| 125 if len(command_args) < len(command['args']): | |
| 126 commandparser.error("Not enough arguments given") | |
| 127 if len(command_args) != len(command['args']) and not command['varargs']: | |
| 128 commandparser.error("Too many arguments given") | |
| 129 | |
| 130 # invoke the command | |
| 131 retval = getattr(_object, name)(*command_args, **command_options.__dict__) | |
| 132 if isinstance(retval, basestring): | |
| 133 print retval | |
| 134 elif retval is None: | |
| 135 pass | |
| 136 elif isinstance(retval, list): | |
| 137 for i in retval: | |
| 138 print i | |
| 139 elif isinstance(retval, dict): | |
| 140 try: | |
| 141 print json.dumps(retval, indent=2, sort_keys=True) | |
| 142 except: | |
| 143 pprint(retval) | |
| 144 else: | |
| 145 pprint(retval) | |
| 146 return retval | |
| 147 | |
| 148 def command(self, function): | |
| 149 name = function.func_name | |
| 150 if function.__doc__: | |
| 151 doc = inspect.cleandoc(function.__doc__) | |
| 152 else: | |
| 153 doc = '' | |
| 154 argspec = inspect.getargspec(function) | |
| 155 defaults = argspec.defaults | |
| 156 if defaults: | |
| 157 args = argspec.args[1:-len(defaults)] | |
| 158 optional = dict(zip(argspec.args[-len(defaults):], defaults)) | |
| 159 else: | |
| 160 args = argspec.args[1:] | |
| 161 optional = None | |
| 5 | 162 command = {'doc': doc, |
| 163 'name': name, | |
| 164 'args': args, | |
| 165 'optional': optional, | |
| 166 'varargs': argspec.varargs | |
| 167 } | |
| 1 | 168 return command |
| 169 | |
| 170 def commandargs2str(self, command): | |
| 171 if isinstance(command, basestring): | |
| 172 command = self.commands[command] | |
| 173 retval = [] | |
| 174 retval.extend(['<%s>' % arg for arg in command['args']]) | |
| 175 varargs = command['varargs'] | |
| 176 if varargs: | |
| 177 retval.append('<%s> [%s] [...]' % (varargs, varargs)) | |
| 178 if command['optional']: | |
| 179 retval.append('[options]') | |
| 180 return ' '.join(retval) | |
| 181 | |
| 182 def doc2arghelp(self, docstring, decoration='-', delimeter=':'): | |
| 183 """ | |
| 184 Parse a docstring and get at the section describing arguments | |
| 185 - decoration: decoration character | |
| 186 - delimeter: delimter character | |
| 3 | 187 |
| 1 | 188 Yields a tuple of the stripped docstring and the arguments help |
| 189 dictionary | |
| 190 """ | |
| 191 lines = [ i.strip() for i in docstring.split('\n') ] | |
| 192 argdict = {} | |
| 193 doc = [] | |
| 194 option = None | |
| 195 for line in lines: | |
| 196 if not line and option: # blank lines terminate [?] | |
| 197 break | |
| 198 if line.startswith(decoration) and delimeter in line: | |
| 199 name, description = line.split(delimeter, 1) | |
| 200 name = name.lstrip(decoration).strip() | |
| 201 description = description.strip() | |
| 202 argdict[name] = [ description ] | |
| 203 option = name | |
| 204 else: | |
| 205 if option: | |
| 206 argdict[name].append(line) | |
| 207 else: | |
| 208 doc.append(line) | |
| 209 argdict = dict([(key, ' '.join(value)) | |
| 210 for key, value in argdict.items()]) | |
| 211 return ('\n'.join(doc), argdict) | |
| 212 | |
| 213 def command2parser(self, command, parser=None): | |
| 214 if isinstance(command, basestring): | |
| 215 command = self.commands[command] | |
| 216 doc, argdict = self.doc2arghelp(command['doc']) | |
| 217 if parser is None: | |
| 218 parser = OptionParser('%%prog %s %s' % (command['name'], self.commandargs2str(command)), | |
| 219 description=doc, add_help_option=False) | |
| 220 if command['optional']: | |
| 221 for key, value in command['optional'].items(): | |
| 222 help = argdict.get(key, '') | |
| 223 if value is True: | |
| 224 parser.add_option('--no-%s' % key, dest=key, | |
| 225 action='store_false', default=True, | |
| 226 help=help) | |
| 227 elif value is False: | |
| 228 parser.add_option('--%s' % key, action='store_true', | |
| 229 default=False, help=help) | |
| 4 | 230 elif isinstance(value, int): |
| 231 help += ' [DEFAULT: %s]' % value | |
| 232 parser.add_option('--%s' % key, help=help, | |
| 233 type='int', default=value) | |
| 1 | 234 elif type(value) in set([type(()), type([])]): |
| 235 if value: | |
| 236 help += ' [DEFAULT: %s]' % value | |
| 237 parser.add_option('--%s' % key, action='append', | |
| 238 default=list(value), | |
| 239 help=help) | |
| 240 else: | |
| 241 if value is not None: | |
| 242 help += ' [DEFAULT: %s]' % value | |
| 243 parser.add_option('--%s' % key, help=help, default=value) | |
| 3 | 244 |
| 1 | 245 return parser |