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annotate piecrust/main.py @ 99:8703be118430

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Changes to `help` command and extendable commands: - The `help` command has a prettier output, with descriptions of help topics. - `ExtendableChefCommand` is not assuming extensions are sub-commands anymore.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 13 Sep 2014 14:47:01 -0700
parents 5959a117a943
children 028df35a690e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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99
8703be118430 Changes to `help` command and extendable commands:
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parents: 98
diff changeset
1 import io
3
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2 import sys
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3 import time
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4 import os.path
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5 import logging
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6 import argparse
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7 import colorama
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8 from piecrust import APP_VERSION
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9 from piecrust.app import PieCrust, PieCrustConfiguration
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10 from piecrust.chefutil import (format_timed, log_friendly_exception,
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11 print_help_item)
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12 from piecrust.commands.base import CommandContext
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13 from piecrust.environment import StandardEnvironment
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14 from piecrust.pathutil import SiteNotFoundError, find_app_root
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15 from piecrust.plugins.base import PluginLoader
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16
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17
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18 logger = logging.getLogger(__name__)
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19
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20
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21 class ColoredFormatter(logging.Formatter):
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22 COLORS = {
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23 'DEBUG': colorama.Fore.BLACK + colorama.Style.BRIGHT,
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24 'INFO': '',
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25 'WARNING': colorama.Fore.YELLOW,
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26 'ERROR': colorama.Fore.RED,
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27 'CRITICAL': colorama.Back.RED + colorama.Fore.WHITE
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28 }
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29
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30 def __init__(self, fmt=None, datefmt=None):
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31 super(ColoredFormatter, self).__init__(fmt, datefmt)
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32
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33 def format(self, record):
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34 color = self.COLORS.get(record.levelname)
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35 res = super(ColoredFormatter, self).format(record)
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36 if color:
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37 res = color + res + colorama.Style.RESET_ALL
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38 return res
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40
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41 class NullPieCrust:
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42 def __init__(self):
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43 self.root_dir = None
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44 self.debug = False
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45 self.templates_dirs = []
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46 self.plugins_dirs = []
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47 self.theme_dir = None
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48 self.cache_dir = None
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49 self.config = PieCrustConfiguration()
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50 self.plugin_loader = PluginLoader(self)
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51 self.env = StandardEnvironment()
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52 self.env.initialize(self)
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53
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54
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55 def main():
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56 argv = sys.argv
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57 pre_args = _pre_parse_chef_args(argv)
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58 try:
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59 exit_code = _run_chef(pre_args)
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60 except Exception as ex:
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61 if pre_args.debug:
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62 logger.exception(ex)
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63 else:
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64 log_friendly_exception(logger, ex)
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65 exit_code = 1
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66 sys.exit(exit_code)
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67
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68
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69 class PreParsedChefArgs(object):
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70 def __init__(self, root=None, cache=True, debug=False, quiet=False,
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71 log_file=None, log_debug=False, config_variant=None):
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72 self.root = root
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73 self.cache = cache
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74 self.debug = debug
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75 self.quiet = quiet
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76 self.log_file = log_file
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77 self.log_debug = log_debug
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78 self.config_variant = config_variant
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79
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80
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81 def _pre_parse_chef_args(argv):
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82 # We need to parse some arguments before we can build the actual argument
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83 # parser, because it can affect which plugins will be loaded. Also, log-
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84 # related arguments must be parsed first because we want to log everything
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85 # from the beginning.
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86 res = PreParsedChefArgs()
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87 i = 1
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88 while i < len(argv):
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89 arg = argv[i]
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90 if arg.startswith('--root='):
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91 res.root = os.path.expanduser(arg[len('--root='):])
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92 elif arg == '--root':
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93 res.root = argv[i + 1]
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94 ++i
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95 elif arg.startswith('--config='):
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96 res.config_variant = arg[len('--config='):]
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97 elif arg == '--config':
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98 res.config_variant = argv[i + 1]
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99 ++i
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100 elif arg == '--log':
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101 res.log_file = argv[i + 1]
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102 ++i
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103 elif arg == '--log-debug':
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104 res.log_debug = True
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105 elif arg == '--no-cache':
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106 res.cache = False
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107 elif arg == '--debug':
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108 res.debug = True
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109 elif arg == '--quiet':
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110 res.quiet = True
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111
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112 if arg[0] != '-':
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113 break
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114
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115 i = i + 1
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116
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117 # Setup the logger.
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118 if res.debug and res.quiet:
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119 raise Exception("You can't specify both --debug and --quiet.")
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120
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121 colorama.init()
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122 root_logger = logging.getLogger()
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123 root_logger.setLevel(logging.INFO)
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124 if res.debug or res.log_debug:
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125 root_logger.setLevel(logging.DEBUG)
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126
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127 log_handler = logging.StreamHandler(sys.stdout)
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128 if res.debug:
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129 log_handler.setLevel(logging.DEBUG)
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130 log_handler.setFormatter(ColoredFormatter("[%(name)s] %(message)s"))
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131 else:
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132 if res.quiet:
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133 log_handler.setLevel(logging.WARNING)
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134 else:
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135 log_handler.setLevel(logging.INFO)
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136 log_handler.setFormatter(ColoredFormatter("%(message)s"))
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137 root_logger.addHandler(log_handler)
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138
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139 if res.log_file:
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140 file_handler = logging.FileHandler(res.log_file, mode='w')
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141 root_logger.addHandler(file_handler)
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142 if res.log_debug:
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143 file_handler.setLevel(logging.DEBUG)
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144
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145 return res
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146
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147
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148 def _run_chef(pre_args):
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149 # Setup the app.
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150 start_time = time.clock()
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151 root = pre_args.root
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152 if root is None:
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153 try:
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154 root = find_app_root()
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155 except SiteNotFoundError:
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156 root = None
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157
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158 if not root:
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159 app = NullPieCrust()
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160 else:
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161 app = PieCrust(root, cache=pre_args.cache, debug=pre_args.debug)
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162
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163 # Handle a configuration variant.
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164 if pre_args.config_variant is not None:
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165 if not root:
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166 raise SiteNotFoundError("Can't apply any variant.")
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167 app.config.applyVariant('variants/' + pre_args.config_variant)
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168
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169 # Setup the arg parser.
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170 parser = argparse.ArgumentParser(
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171 prog='chef',
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172 description="The PieCrust chef manages your website.",
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173 formatter_class=argparse.RawDescriptionHelpFormatter)
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174 parser.add_argument('--version', action='version', version=('%(prog)s ' + APP_VERSION))
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175 parser.add_argument('--root', help="The root directory of the website.")
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176 parser.add_argument('--config', help="The configuration variant to use for this command.")
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177 parser.add_argument('--debug', help="Show debug information.", action='store_true')
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178 parser.add_argument('--no-cache', help="When applicable, disable caching.", action='store_true')
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179 parser.add_argument('--quiet', help="Print only important information.", action='store_true')
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180 parser.add_argument('--log', help="Send log messages to the specified file.")
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181 parser.add_argument('--log-debug', help="Log debug messages to the log file.", action='store_true')
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182
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183 commands = sorted(app.plugin_loader.getCommands(),
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184 key=lambda c: c.name)
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185 subparsers = parser.add_subparsers(title='list of commands')
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186 for c in commands:
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187 p = subparsers.add_parser(c.name, help=c.description)
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188 c.setupParser(p, app)
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189 p.set_defaults(func=c.checkedRun)
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190
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191 help_cmd = next(filter(lambda c: c.name == 'help', commands), None)
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192 if help_cmd and help_cmd.has_topics:
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193 with io.StringIO() as epilog:
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194 epilog.write("additional help topics:\n")
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195 for name, desc in help_cmd.getTopics():
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196 print_help_item(epilog, name, desc)
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197 parser.epilog = epilog.getvalue()
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198
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199
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200 # Parse the command line.
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201 result = parser.parse_args()
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202 logger.debug(format_timed(start_time, 'initialized PieCrust', colored=False))
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203
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204 # Print the help if no command was specified.
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205 if not hasattr(result, 'func'):
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206 parser.print_help()
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207 return 0
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208
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209 # Run the command!
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210 ctx = CommandContext(app, parser, result)
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211 exit_code = result.func(ctx)
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212 if exit_code is None:
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213 return 0
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214 if not isinstance(exit_code, int):
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215 logger.error("Got non-integer exit code: %s" % exit_code)
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216 return -1
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217 return exit_code
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218