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annotate piecrust/commands/base.py @ 545:1856e7aa6ce8

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cm: Update changelog.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 31 Jul 2015 23:35:55 -0700
parents 456db44dcc53
children 3ceeca7bb71c
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1 import logging
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2 import argparse
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3 import functools
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4 from piecrust.pathutil import SiteNotFoundError
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7 logger = logging.getLogger(__name__)
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10 class CommandContext(object):
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11 def __init__(self, app, parser, args):
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12 self.app = app
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13 self.parser = parser
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14 self.args = args
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15 self.config_variant = None
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16 self.config_values = None
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18
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19 class ChefCommand(object):
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20 def __init__(self):
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21 self.name = '__unknown__'
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22 self.description = '__unknown__'
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23 self.requires_website = True
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24 self.cache_name = 'default'
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25
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26 def setupParser(self, parser, app):
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27 raise NotImplementedError()
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29 def run(self, ctx):
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30 raise NotImplementedError("Command '%s' doesn't implement the `run` "
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31 "method." % type(self))
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32
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33 def checkedRun(self, ctx):
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34 if ctx.app.root_dir is None and self.requires_website:
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35 raise SiteNotFoundError()
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36 return self.run(ctx)
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38
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39 class ExtendableChefCommand(ChefCommand):
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40 def __init__(self):
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41 super(ExtendableChefCommand, self).__init__()
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42 self._extensions = None
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43
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44 def getExtensions(self, app):
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45 self._loadExtensions(app)
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46 return self._extensions
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47
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48 def setupExtensionParsers(self, subparsers, app):
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49 for e in self.getExtensions(app):
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50 p = subparsers.add_parser(e.name, help=e.description)
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51 e.setupParser(p, app)
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52 p.set_defaults(sub_func=e.checkedRun)
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53
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54 def _loadExtensions(self, app):
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55 if self._extensions is not None:
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56 return
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57 self._extensions = []
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58 for e in app.plugin_loader.getCommandExtensions():
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59 if e.command_name == self.name and e.supports(app):
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60 self._extensions.append(e)
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61
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62
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63 class ChefCommandExtension(object):
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64 command_name = '__unknown__'
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65
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66 def supports(self, app):
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67 return True
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69
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70 class HelpCommand(ExtendableChefCommand):
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71 def __init__(self):
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72 super(HelpCommand, self).__init__()
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73 self.name = 'help'
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74 self.description = "Prints help about PieCrust's chef."
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75 self.requires_website = False
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76 self._topic_providers = []
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77
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78 @property
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79 def has_topics(self):
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80 return len(self._topic_providers) > 0
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81
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82 def getTopics(self):
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83 return [(n, d) for (n, d, e) in self._topic_providers]
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84
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85 def setupParser(self, parser, app):
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86 parser.add_argument('topic', nargs='?',
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87 help="The command name or topic on which to get help.")
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88
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89 extensions = self.getExtensions(app)
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90 for ext in extensions:
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91 for name, desc in ext.getHelpTopics():
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92 self._topic_providers.append((name, desc, ext))
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93
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94 def run(self, ctx):
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95 topic = ctx.args.topic
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96
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97 if topic is None:
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98 ctx.parser.print_help()
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99 return 0
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100
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101 for name, desc, ext in self._topic_providers:
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102 if name == topic:
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103 print(ext.getHelpTopic(topic, ctx.app))
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104 return 0
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105
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106 for c in ctx.app.plugin_loader.getCommands():
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107 if c.name == topic:
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108 fake = argparse.ArgumentParser(
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109 prog='%s %s' % (ctx.parser.prog, c.name),
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110 description=c.description)
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111 c.setupParser(fake, ctx.app)
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112 fake.print_help()
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113 return 0
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114
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115 raise Exception("No such command or topic: %s" % topic)
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117
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118 class _WrappedCommand(ChefCommand):
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119 def __init__(self, func, name, description):
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120 super(_WrappedCommand, self).__init__()
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121 self.func = func
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122 self.name = name
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123 self.description = description
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124
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125 def run(self, ctx):
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126 self.func(ctx)
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127
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128
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129 def simple_command(f, name, description=None):
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130 @functools.wraps(f)
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131 def wrapper(*args, **kwargs):
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132 return f(*args, **kwargs)
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133 cmd = _WrappedCommand(f, name, description)
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134 f.__command_class__ = cmd
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135 return wrapper
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136
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137
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents: 1
diff changeset
138 def get_func_command(f):
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents: 1
diff changeset
139 return getattr(f, '__command_class__')
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents: 1
diff changeset
140