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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):
try:
factory = ep.load()
except Exception as err:
app.stdout.write('Could not load %r\n' % ep)
continue
try:
cmd = factory(self, None)
except Exception as err:
app.stdout.write('Could not instantiate %r: %s\n' % (ep, err))
continue
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 take_action(self, parsed_args):
if parsed_args.cmd:
try:
the_cmd = self.app.command_manager.find_command(
parsed_args.cmd,
)
cmd_factory, cmd_name, search_args = the_cmd
except ValueError:
# Did not find an exact match
cmd = parsed_args.cmd[0]
fuzzy_matches = [k[0] for k in self.app.command_manager
if k[0].startswith(cmd)
]
if not fuzzy_matches:
raise
self.app.stdout.write('Command "%s" matches:\n' % cmd)
for fm in fuzzy_matches:
self.app.stdout.write(' %s\n' % fm)
return
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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