Mercurial > mozilla > hg > ProfileManager

annotate profilemanager/command.py @ 34:5a27ad649768

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more verbose asserts
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 06 May 2010 17:44:54 -0700
parents ca57920aa223
children 81500171fda8
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1 """
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2 a command-line interface to the command line, a la pythonpaste
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3 """
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4
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5 import inspect
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6 import sys
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7 from optparse import OptionParser
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8 from pprint import pprint
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9
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10 if 'commands' not in globals():
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11 commands = {}
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12
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13 def command(function):
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14 # XXX should get bound/unbound state from function (how?)
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15 global commands
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16 name = function.func_name
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17 doc = inspect.cleandoc(function.__doc__)
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18 argspec = inspect.getargspec(function)
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19 defaults = argspec.defaults
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20 if defaults:
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21 args = argspec.args[1:-len(defaults)]
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22 optional = dict(zip(argspec.args[-len(defaults):], defaults))
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23 else:
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24 args = argspec.args[1:]
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25 optional = None
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26 commands[name] = { 'doc': doc,
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27 'args': args,
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28 'optional': optional,
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29 'varargs': argspec.varargs
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30 }
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31 return function
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32
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33 def commandargs2str(command):
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34 if isinstance(command, basestring):
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35 command = commands[command]
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36 retval = []
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37 retval.extend(['<%s>' % arg for arg in command['args']])
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38 varargs = command['varargs']
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39 if varargs:
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40 retval.append('<%s> [%s] [...]' % (varargs, varargs))
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41 if command['optional']:
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42 retval.append('[options]')
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43 return ' '.join(retval)
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44
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45
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46 def doc2arghelp(docstring, decoration='-', delimeter=':'):
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47 """
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48 Parse a docstring and get at the section describing arguments
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49 - decoration: decoration character
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50 - delimeter: delimter character
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51
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52 Yields a tuple of the stripped docstring and the arguments help
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53 dictionary
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54 """
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55 lines = [ i.strip() for i in docstring.split('\n') ]
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56 argdict = {}
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57 doc = []
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58 option = None
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59 for line in lines:
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60 if not line and option: # blank lines terminate
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61 break
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62 if line.startswith(decoration) and delimeter in line:
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63 name, description = line.split(delimeter, 1)
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64 name = name.lstrip(decoration).strip()
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65 description = description.strip()
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66 argdict[name] = [ description ]
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67 option = name
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68 else:
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69 if option:
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70 argdict[name].append(line)
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71 else:
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72 doc.append(line)
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73 argdict = dict([(key, ' '.join(value))
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74 for key, value in argdict.items()])
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75 return ('\n'.join(doc), argdict)
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76
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77 def command2parser(command):
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78 doc, argdict = doc2arghelp(commands[command]['doc'])
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79 parser = OptionParser('%%prog %s %s' % (command, commandargs2str(command)),
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80 description=doc, add_help_option=False)
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81 if commands[command]['optional']:
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82 for key, value in commands[command]['optional'].items():
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83 help = argdict.get(key)
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84 if value is True:
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85 parser.add_option('--no-%s' % key, dest=key,
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86 action='store_false', default=True,
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87 help=help)
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88 elif value is False:
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89 parser.add_option('--%s' % key, action='store_true',
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90 default=False, help=help)
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91 else:
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92 parser.add_option('--%s' % key, help=help)
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93
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94 return parser
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95
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96 class CommandParser(OptionParser):
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97 def __init__(self, commands, description=None, setup=None):
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98 usage = '%prog [options] command [command-options]'
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99 OptionParser.__init__(self, usage=usage, description=description)
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100 for _command in commands:
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101 command(_command)
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102 self.disable_interspersed_args()
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103 self.setup = setup
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104
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105 def print_help(self):
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106 OptionParser.print_help(self)
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107 # short descriptions for commands
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108 command_descriptions = [dict(name=i,
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109 description=commands[i]['doc'].strip().split('\n',1)[0])
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110 for i in sorted(commands.keys())]
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111 max_len = max([len(i['name']) for i in command_descriptions])
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112 description = "Commands: \n%s" % ('\n'.join([' %s%s %s' % (description['name'], ' ' * (max_len - len(description['name'])), description['description'])
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113 for description in command_descriptions]))
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114
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115 print
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116 print description
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117
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118 def parse(self, args=sys.argv[1:]):
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119 """global parse step"""
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120
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121 self.options, args = self.parse_args(args)
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122
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123 # help/sanity check -- should probably be separated
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124 if not len(args):
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125 self.print_help()
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126 sys.exit(0)
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127 if args[0] == 'help':
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128 if len(args) == 2:
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129 if args[1] in commands:
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130 name = args[1]
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131 commandparser = command2parser(name)
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132 commandparser.print_help()
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133 else:
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134 self.error("No command '%s'" % args[1])
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135 else:
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136 self.print_help()
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137 sys.exit(0)
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138 command = args[0]
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139 if command not in commands:
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140 self.error("No command '%s'" % command)
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141 return command, args[1:]
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142
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143 def invoke(self, args=sys.argv[1:]):
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144 """
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145 invoke
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146 """
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147
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148 # parse
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149 name, args = self.parse(args)
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150
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151 # setup
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152 _object = self.setup(self, self.options)
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153
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154 # command specific args
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155 command = commands[name]
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156 commandparser = command2parser(name)
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157 command_options, command_args = commandparser.parse_args(args)
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158 if len(command_args) < len(command['args']):
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159 commandparser.error("Not enough arguments given")
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160 if len(command_args) != len(command['args']) and not command['varargs']:
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161 commandparser.error("Too many arguments given")
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162
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163 # invoke the command
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164 retval = getattr(_object, name)(*command_args, **command_options.__dict__)
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165 if isinstance(retval, basestring):
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166 print retval
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167 else:
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168 pprint(retval)
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169 return retval
1
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170