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import argparse
import sys
from .command import Command
class HelpAction(argparse.Action):
"""Provide a custom action so the -h and --help options
to the main app will print a list of the commands.
The commands are determined by checking the CommandManager
instance, passed in as the "default" value for the action.
"""
def __call__(self, parser, namespace, values, option_string=None):
app = self.default
parser.print_help(app.stdout)
app.stdout.write('\nCommands:\n')
command_manager = app.command_manager
for name, ep in sorted(command_manager):
factory = ep.load()
cmd = factory(self, None)
one_liner = cmd.get_description().split('\n')[0]
app.stdout.write(' %-13s %s\n' % (name, one_liner))
sys.exit(0)
class HelpCommand(Command):
"""print detailed help for another command
"""
def get_parser(self, prog_name):
parser = super(HelpCommand, self).get_parser(prog_name)
parser.add_argument('cmd',
nargs='*',
help='name of the command',
)
return parser
def run(self, parsed_args):
if parsed_args.cmd:
cmd_factory, cmd_name, search_args = self.app.command_manager.find_command(parsed_args.cmd)
cmd = cmd_factory(self.app, search_args)
full_name = (cmd_name
if self.app.interactive_mode
else ' '.join([self.app.NAME, cmd_name])
)
cmd_parser = cmd.get_parser(full_name)
else:
cmd_parser = self.get_parser(' '.join([self.app.NAME, 'help']))
cmd_parser.print_help(self.app.stdout)
return 0
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