Mercurial > piecrust2

annotate piecrust/commands/base.py @ 549:7453baeb0839

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bake: Set the flags, don't combine. We don't want to combine old flags with new ones, especially if something went different between the last bake and the current one.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 04 Aug 2015 21:21:08 -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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116
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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
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents: 1
diff changeset
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