def set_default_command(parser, func):
"""
Replacement for :meth:`ArgParser.set_default_command`.
It does add the parser's arg variable for the unknown args
as suppressed argument to the func
"""
def _get_option_from_var(var):
return '--{0}'.format(var.replace('_', '-'))
unknown_args_var = getattr(parser, 'unknown_args_varname', None)
if unknown_args_var is not None:
unknown_args_suppress_dict = \
{'help': argparse.SUPPRESS,
'option_strings': (_get_option_from_var(unknown_args_var),)}
# prepare for checking whether unknown_args is in func signature
inferred_args = list(argh.assembling._get_args_from_signature(func))
dests = OrderedDict()
for argspec in inferred_args:
dest = argh.assembling._get_parser_param_kwargs(parser,
argspec)['dest']
dests[dest] = argspec
if argh.assembling._get_dest(parser,
unknown_args_suppress_dict) in dests:
declared_args = getattr(func, ATTR_ARGS, [])
declared_args.insert(0, unknown_args_suppress_dict)
setattr(func, ATTR_ARGS, declared_args)
argh.set_default_command(parser, func)
def set_default_command(parser, function):
""" Sets default command (i.e. a function) for given parser.
If `parser.description` is empty and the function has a docstring,
it is used as the description.
.. note::
An attempt to set default command to a parser which already has
subparsers (e.g. added with :func:`~argh.assembling.add_commands`)
results in a `RuntimeError`.
.. note::
If there are both explicitly declared arguments (e.g. via
:func:`~argh.decorators.arg`) and ones inferred from the function
signature (e.g. via :func:`~argh.decorators.command`), declared ones
will be merged into inferred ones. If an argument does not conform
function signature, `AssemblingError` is raised.
.. note::
If the parser was created with ``add_help=True`` (which is by default),
option name ``-h`` is silently removed from any argument.
"""
if parser._subparsers:
raise RuntimeError('Cannot set default command to a parser with '
'existing subparsers')
function = _fix_compat_issue29(function)
spec = get_arg_spec(function)
declared_args = getattr(function, ATTR_ARGS, [])
inferred_args = list(_get_args_from_signature(function))
if inferred_args and declared_args:
# We've got a mixture of declared and inferred arguments
# a mapping of "dest" strings to argument declarations.
#
# * a "dest" string is a normalized form of argument name, i.e.:
#
# '-f', '--foo' → 'foo'
# 'foo-bar' → 'foo_bar'
#
# * argument declaration is a dictionary representing an argument;
# it is obtained either from _get_args_from_signature() or from
# an @arg decorator (as is).
#
dests = OrderedDict()
for argspec in inferred_args:
dest = _get_parser_param_kwargs(parser, argspec)['dest']
dests[dest] = argspec
for declared_kw in declared_args:
# an argument is declared via decorator
dest = _get_dest(parser, declared_kw)
if dest in dests:
# the argument is already known from function signature
#
# now make sure that this declared arg conforms to the function
# signature and therefore only refines an inferred arg:
#
# @arg('my-foo') maps to func(my_foo)
# @arg('--my-bar') maps to func(my_bar=...)
# either both arguments are positional or both are optional
decl_positional = _is_positional(declared_kw['option_strings'])
infr_positional = _is_positional(dests[dest]['option_strings'])
if decl_positional != infr_positional:
kinds = {True: 'positional', False: 'optional'}
raise AssemblingError(
'{func}: argument "{dest}" declared as {kind_i} '
'(in function signature) and {kind_d} (via decorator)'
.format(
func=function.__name__,
dest=dest,
kind_i=kinds[infr_positional],
kind_d=kinds[decl_positional],
))
# merge explicit argument declaration into the inferred one
# (e.g. `help=...`)
dests[dest].update(**declared_kw)
else:
# the argument is not in function signature
varkw = getattr(spec, 'varkw', getattr(spec, 'keywords', []))
if varkw:
# function accepts **kwargs; the argument goes into it
dests[dest] = declared_kw
else:
# there's no way we can map the argument declaration
# to function signature
xs = (dests[x]['option_strings'] for x in dests)
raise AssemblingError(
'{func}: argument {flags} does not fit '
'function signature: {sig}'.format(
flags=', '.join(declared_kw['option_strings']),
func=function.__name__,
sig=', '.join('/'.join(x) for x in xs)))
# pack the modified data back into a list
inferred_args = dests.values()
command_args = inferred_args or declared_args
# add types, actions, etc. (e.g. default=3 implies type=int)
command_args = [_guess(x) for x in command_args]
for draft in command_args:
draft = draft.copy()
dest_or_opt_strings = draft.pop('option_strings')
if parser.add_help and '-h' in dest_or_opt_strings:
dest_or_opt_strings = [x for x in dest_or_opt_strings if x != '-h']
completer = draft.pop('completer', None)
try:
action = parser.add_argument(*dest_or_opt_strings, **draft)
if COMPLETION_ENABLED and completer:
action.completer = completer
except Exception as e:
raise type(e)('{func}: cannot add arg {args}: {msg}'.format(
args='/'.join(dest_or_opt_strings), func=function.__name__, msg=e))
if function.__doc__ and not parser.description:
parser.description = function.__doc__
parser.set_defaults(function=function)
def set_default_command(parser, function):
"""
Sets default command (i.e. a function) for given parser.
If `parser.description` is empty and the function has a docstring,
it is used as the description.
.. note::
An attempt to set default command to a parser which already has
subparsers (e.g. added with :func:`~argh.assembling.add_commands`)
results in a `AssemblingError`.
.. note::
If there are both explicitly declared arguments (e.g. via
:func:`~argh.decorators.arg`) and ones inferred from the function
signature (e.g. via :func:`~argh.decorators.command`), declared ones
will be merged into inferred ones. If an argument does not conform
function signature, `AssemblingError` is raised.
.. note::
If the parser was created with ``add_help=True`` (which is by default),
option name ``-h`` is silently removed from any argument.
"""
if parser._subparsers:
_require_support_for_default_command_with_subparsers()
spec = get_arg_spec(function)
declared_args = getattr(function, ATTR_ARGS, [])
inferred_args = list(_get_args_from_signature(function))
if inferred_args and declared_args:
# We've got a mixture of declared and inferred arguments
# a mapping of "dest" strings to argument declarations.
#
# * a "dest" string is a normalized form of argument name, i.e.:
#
# '-f', '--foo' → 'foo'
# 'foo-bar' → 'foo_bar'
#
# * argument declaration is a dictionary representing an argument;
# it is obtained either from _get_args_from_signature() or from
# an @arg decorator (as is).
#
dests = OrderedDict()
for argspec in inferred_args:
dest = _get_parser_param_kwargs(parser, argspec)['dest']
dests[dest] = argspec
for declared_kw in declared_args:
# an argument is declared via decorator
dest = _get_dest(parser, declared_kw)
if dest in dests:
# the argument is already known from function signature
#
# now make sure that this declared arg conforms to the function
# signature and therefore only refines an inferred arg:
#
# @arg('my-foo') maps to func(my_foo)
# @arg('--my-bar') maps to func(my_bar=...)
# either both arguments are positional or both are optional
decl_positional = _is_positional(declared_kw['option_strings'])
infr_positional = _is_positional(dests[dest]['option_strings'])
if decl_positional != infr_positional:
kinds = {True: 'positional', False: 'optional'}
raise AssemblingError(
'{func}: argument "{dest}" declared as {kind_i} '
'(in function signature) and {kind_d} (via decorator)'.
format(
func=function.__name__,
dest=dest,
kind_i=kinds[infr_positional],
kind_d=kinds[decl_positional],
))
# merge explicit argument declaration into the inferred one
# (e.g. `help=...`)
dests[dest].update(**declared_kw)
else:
# the argument is not in function signature
varkw = getattr(spec, 'varkw', getattr(spec, 'keywords', []))
if varkw:
# function accepts **kwargs; the argument goes into it
dests[dest] = declared_kw
else:
# there's no way we can map the argument declaration
# to function signature
xs = (dests[x]['option_strings'] for x in dests)
raise AssemblingError(
'{func}: argument {flags} does not fit '
'function signature: {sig}'.format(
flags=', '.join(declared_kw['option_strings']),
func=function.__name__,
sig=', '.join('/'.join(x) for x in xs)))
# pack the modified data back into a list
inferred_args = dests.values()
command_args = inferred_args or declared_args
# add types, actions, etc. (e.g. default=3 implies type=int)
command_args = [_guess(x) for x in command_args]
for draft in command_args:
draft = draft.copy()
if 'help' not in draft:
draft.update(help=DEFAULT_ARGUMENT_TEMPLATE)
dest_or_opt_strings = draft.pop('option_strings')
if parser.add_help and '-h' in dest_or_opt_strings:
dest_or_opt_strings = [x for x in dest_or_opt_strings if x != '-h']
completer = draft.pop('completer', None)
try:
action = parser.add_argument(*dest_or_opt_strings, **draft)
if COMPLETION_ENABLED and completer:
action.completer = completer
except Exception as e:
raise type(e)('{func}: cannot add arg {args}: {msg}'.format(
args='/'.join(dest_or_opt_strings),
func=function.__name__,
msg=e))
if function.__doc__ and not parser.description:
parser.description = function.__doc__
parser.set_defaults(**{
DEST_FUNCTION: function,
})
def set_default_command(parser, function):
"""
Sets default command (i.e. a function) for given parser.
If `parser.description` is empty and the function has a docstring,
it is used as the description.
.. note::
An attempt to set default command to a parser which already has
subparsers (e.g. added with :func:`~argh.assembling.add_commands`)
results in a `RuntimeError`.
.. note::
If there are both explicitly declared arguments (e.g. via
:func:`~argh.decorators.arg`) and ones inferred from the function
signature (e.g. via :func:`~argh.decorators.command`), declared ones
will be merged into inferred ones. If an argument does not conform
function signature, `AssemblingError` is raised.
.. note::
If the parser was created with ``add_help=True`` (which is by default),
option name ``-h`` is silently removed from any argument.
"""
if parser._subparsers:
raise RuntimeError('Cannot set default command to a parser with '
'existing subparsers')
spec = get_arg_spec(function)
declared_args = getattr(function, ATTR_ARGS, [])
inferred_args = list(_get_args_from_signature(function))
toggleables = getattr(function, ATTR_TOGGLEABLES, [])
if inferred_args and declared_args:
# We've got a mixture of declared and inferred arguments
# a mapping of "dest" strings to argument declarations.
#
# * a "dest" string is a normalized form of argument name, i.e.:
#
# '-f', '--foo' → 'foo'
# 'foo-bar' → 'foo_bar'
#
# * argument declaration is a dictionary representing an argument;
# it is obtained either from _get_args_from_signature() or from
# an @arg decorator (as is).
#
dests = OrderedDict()
for argspec in inferred_args:
dest = _get_parser_param_kwargs(parser, argspec)['dest']
dests[dest] = argspec
for declared_kw in declared_args:
# an argument is declared via decorator
dest = _get_dest(parser, declared_kw)
if dest in dests:
# the argument is already known from function signature
#
# now make sure that this declared arg conforms to the function
# signature and therefore only refines an inferred arg:
#
# @arg('my-foo') maps to func(my_foo)
# @arg('--my-bar') maps to func(my_bar=...)
# either both arguments are positional or both are optional
decl_positional = _is_positional(declared_kw['option_strings'])
infr_positional = _is_positional(dests[dest]['option_strings'])
if decl_positional != infr_positional:
kinds = {True: 'positional', False: 'optional'}
raise AssemblingError(
'{func}: argument "{dest}" declared as {kind_i} '
'(in function signature) and {kind_d} (via decorator)'
.format(
func=function.__name__,
dest=dest,
kind_i=kinds[infr_positional],
kind_d=kinds[decl_positional],
))
# merge explicit argument declaration into the inferred one
# (e.g. `help=...`)
dests[dest].update(**declared_kw)
else:
# the argument is not in function signature
varkw = getattr(spec, 'varkw', getattr(spec, 'keywords', []))
if varkw:
# function accepts **kwargs; the argument goes into it
dests[dest] = declared_kw
else:
# there's no way we can map the argument declaration
# to function signature
xs = (dests[x]['option_strings'] for x in dests)
raise AssemblingError(
'{func}: argument {flags} does not fit '
'function signature: {sig}'.format(
flags=', '.join(declared_kw['option_strings']),
func=function.__name__,
sig=', '.join('/'.join(x) for x in xs)))
# pack the modified data back into a list
inferred_args = dests.values()
opt_string_togmap = {}
for toggleable, inv_prefix in [(t, i) for t,i in toggleables]:
if toggleable.find('_') >= 0:
raise AssemblingError("Toggleable destinations cannot contain underscores")
#for each toggleable, verify there exists a matching destination
matched_dest = False
for arg in inferred_args:
for opt_str in arg['option_strings']:
if opt_str == toggleable:
matched_dest = True
opt_string_togmap[opt_str] = (toggleable[2:], inv_prefix)
if not matched_dest:
raise AssemblingError("Unrecognized destination for toggleable: {}".format(toggleable))
command_args = inferred_args or declared_args
# add types, actions, etc. (e.g. default=3 implies type=int)
command_args = [_guess(x) for x in command_args]
for draft in command_args:
draft = draft.copy()
if 'help' not in draft:
draft.update(help=DEFAULT_ARGUMENT_TEMPLATE)
dest_or_opt_strings = draft.pop('option_strings')
if parser.add_help and '-h' in dest_or_opt_strings:
dest_or_opt_strings = [x for x in dest_or_opt_strings if x != '-h']
completer = draft.pop('completer', None)
try:
if dest_or_opt_strings[-1] in opt_string_togmap:
# if we're working with a toggleable list of opt_strings, make mutually exclusive
# and set to opposite defaults & storing actions
toggleable, inv_prefix = opt_string_togmap[dest_or_opt_strings[-1]]
group = parser.add_mutually_exclusive_group()
draft['action'] = 'store_true'
draft['dest'] = toggleable.replace('-', '_')
# XXX unsure about desired behavior in autocompletion of toggleables case
action = group.add_argument(*dest_or_opt_strings, **draft)
not_dest_or_opt_strings = tuple(map(lambda x : '--{}-{}'.format(inv_prefix, x.lstrip('-')),
dest_or_opt_strings))
draft['action'] = 'store_false'
group.add_argument(*not_dest_or_opt_strings, **draft)
else:
action = parser.add_argument(*dest_or_opt_strings, **draft)
if COMPLETION_ENABLED and completer:
action.completer = completer
except Exception as e:
raise type(e)('{func}: cannot add arg {args}: {msg}'.format(
args='/'.join(dest_or_opt_strings), func=function.__name__, msg=e))
if function.__doc__ and not parser.description:
parser.description = function.__doc__
parser.set_defaults(function=function)