Mercurial > piecrust2

annotate piecrust/commands/base.py @ 1139:cd5267cd23ef

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cm: Update npm modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 20 May 2018 22:37:38 -0700
parents 07c23be08029
children
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1 import os.path
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2 import logging
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3 import argparse
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4 import textwrap
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5 import functools
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6 from piecrust import RESOURCES_DIR
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7 from piecrust.pathutil import SiteNotFoundError
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9
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10 logger = logging.getLogger(__name__)
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12
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13 class CommandContext(object):
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14 def __init__(self, appfactory, app, parser, args):
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15 self.appfactory = appfactory
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16 self.app = app
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17 self.parser = parser
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18 self.args = args
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20
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21 class ChefCommand(object):
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22 def __init__(self):
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23 self.name = '__unknown__'
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24 self.description = '__unknown__'
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25 self.requires_website = True
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26 self.cache_name = 'default'
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27
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28 def setupParser(self, parser, app):
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29 raise NotImplementedError()
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30
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31 def provideExtensions(self):
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32 return None
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33
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34 def run(self, ctx):
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35 raise NotImplementedError(
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36 "Command '%s' doesn't implement the `run` "
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37 "method." % type(self))
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38
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39 def checkedRun(self, ctx):
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40 if ctx.app.root_dir is None and self.requires_website:
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41 raise SiteNotFoundError(theme=ctx.app.theme_site)
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42 return self.run(ctx)
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44
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45 class ExtendableChefCommand(ChefCommand):
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46 def __init__(self):
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47 super(ExtendableChefCommand, self).__init__()
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48 self._extensions = None
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49
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50 def getExtensions(self, app):
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51 self._loadExtensions(app)
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52 return self._extensions
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53
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54 def setupExtensionParsers(self, subparsers, app):
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55 for e in self.getExtensions(app):
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56 p = subparsers.add_parser(e.name, help=e.description)
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57 e.setupParser(p, app)
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58 p.set_defaults(sub_func=e.checkedRun)
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59
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60 def _loadExtensions(self, app):
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61 if self._extensions is not None:
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62 return
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63
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64 possible_exts = []
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65 for e in app.plugin_loader.getCommandExtensions():
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66 possible_exts.append(e)
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67 for c in app.plugin_loader.getCommands():
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68 exts = c.provideExtensions()
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69 if exts is not None:
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70 possible_exts += exts
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71
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72 self._extensions = list(filter(
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73 lambda e: e.command_name == self.name and e.supports(app),
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74 possible_exts))
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75
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76
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77 class ChefCommandExtension(object):
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78 command_name = '__unknown__'
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79
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80 def supports(self, app):
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81 return True
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82
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83
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84 class HelpCommand(ExtendableChefCommand):
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85 def __init__(self):
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86 super(HelpCommand, self).__init__()
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87 self.name = 'help'
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88 self.description = "Prints help about PieCrust's chef."
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89 self.requires_website = False
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90 self._topic_providers = []
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91
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92 @property
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93 def has_topics(self):
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94 return len(self._topic_providers) > 0
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95
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96 def getTopics(self):
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97 return [(n, d) for (n, d, e) in self._topic_providers]
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98
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99 def setupParser(self, parser, app):
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100 parser.add_argument(
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101 'topic', nargs='?',
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102 help="The command name or topic on which to get help.")
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103
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104 extensions = self.getExtensions(app)
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105 for ext in extensions:
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106 for name, desc in ext.getHelpTopics():
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107 self._topic_providers.append((name, desc, ext))
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108
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109 def run(self, ctx):
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110 topic = ctx.args.topic
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111
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112 if topic is None:
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113 ctx.parser.print_help()
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114 return 0
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115
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116 for name, desc, ext in self._topic_providers:
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117 if name == topic:
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118 print(ext.getHelpTopic(topic, ctx.app))
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119 return 0
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120
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121 for c in ctx.app.plugin_loader.getCommands():
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122 if c.name == topic:
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123 fake = argparse.ArgumentParser(
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124 prog='%s %s' % (ctx.parser.prog, c.name),
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125 description=c.description)
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126 c.setupParser(fake, ctx.app)
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127 fake.print_help()
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128 return 0
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129
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130 raise Exception("No such command or topic: %s" % topic)
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131
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132
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133 class _WrappedCommand(ChefCommand):
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134 def __init__(self, func, name, description):
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135 super(_WrappedCommand, self).__init__()
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136 self.func = func
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137 self.name = name
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138 self.description = description
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139
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140 def run(self, ctx):
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141 self.func(ctx)
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142
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143
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144 def simple_command(f, name, description=None):
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145 @functools.wraps(f)
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146 def wrapper(*args, **kwargs):
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147 return f(*args, **kwargs)
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148 cmd = _WrappedCommand(f, name, description)
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149 f.__command_class__ = cmd
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150 return wrapper
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151
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152
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153 def get_func_command(f):
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154 return getattr(f, '__command_class__')
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155
1099
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156
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157 def _get_help_topic_from_resources(command_name, topic):
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158 path = os.path.join(RESOURCES_DIR, 'helptopics',
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159 '%s_%s.txt' % (command_name, topic))
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160 with open(path, 'r', encoding='utf8') as fp:
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161 lines = fp.readlines()
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162
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163 wrapped_lines = []
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164 for ln in lines:
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165 ln = ln.rstrip('\n')
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166 if not ln:
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167 wrapped_lines.append('')
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168 else:
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169 wrapped_lines += textwrap.wrap(ln, width=80)
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170 return '\n'.join(wrapped_lines)
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171
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172
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173 class _ResourcesHelpTopics:
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174 def getHelpTopic(self, topic, app):
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175 category = self.__class__.__name__.lower()
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176 if category.endswith('helptopic'):
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177 category = category[:-len('helptopic')]
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178 return _get_help_topic_from_resources(category, topic)