from ._compat import filename_to_ui
from ._compat import get_text_stderr
from ._compat import PY2
from .utils import echo
def _join_param_hints(param_hint):
if isinstance(param_hint, (tuple, list)):
return " / ".join(repr(x) for x in param_hint)
return param_hint
[docs]class ClickException(Exception):
"""An exception that Click can handle and show to the user."""
#: The exit code for this exception
exit_code = 1
def __init__(self, message):
ctor_msg = message
if PY2:
if ctor_msg is not None:
ctor_msg = ctor_msg.encode("utf-8")
Exception.__init__(self, ctor_msg)
self.message = message
def __str__(self):
return self.message
if PY2:
__unicode__ = __str__
def __str__(self):
return self.message.encode("utf-8")
[docs] def show(self, file=None):
if file is None:
file = get_text_stderr()
echo("Error: {}".format(self.format_message()), file=file)
[docs]class UsageError(ClickException):
"""An internal exception that signals a usage error. This typically
aborts any further handling.
:param message: the error message to display.
:param ctx: optionally the context that caused this error. Click will
fill in the context automatically in some situations.
"""
exit_code = 2
def __init__(self, message, ctx=None):
ClickException.__init__(self, message)
self.ctx = ctx
self.cmd = self.ctx.command if self.ctx else None
[docs] def show(self, file=None):
if file is None:
file = get_text_stderr()
color = None
hint = ""
if self.cmd is not None and self.cmd.get_help_option(self.ctx) is not None:
hint = "Try '{} {}' for help.\n".format(
self.ctx.command_path, self.ctx.help_option_names[0]
)
if self.ctx is not None:
color = self.ctx.color
echo("{}\n{}".format(self.ctx.get_usage(), hint), file=file, color=color)
echo("Error: {}".format(self.format_message()), file=file, color=color)
[docs]class BadParameter(UsageError):
"""An exception that formats out a standardized error message for a
bad parameter. This is useful when thrown from a callback or type as
Click will attach contextual information to it (for instance, which
parameter it is).
.. versionadded:: 2.0
:param param: the parameter object that caused this error. This can
be left out, and Click will attach this info itself
if possible.
:param param_hint: a string that shows up as parameter name. This
can be used as alternative to `param` in cases
where custom validation should happen. If it is
a string it's used as such, if it's a list then
each item is quoted and separated.
"""
def __init__(self, message, ctx=None, param=None, param_hint=None):
UsageError.__init__(self, message, ctx)
self.param = param
self.param_hint = param_hint
[docs]class MissingParameter(BadParameter):
"""Raised if click required an option or argument but it was not
provided when invoking the script.
.. versionadded:: 4.0
:param param_type: a string that indicates the type of the parameter.
The default is to inherit the parameter type from
the given `param`. Valid values are ``'parameter'``,
``'option'`` or ``'argument'``.
"""
def __init__(
self, message=None, ctx=None, param=None, param_hint=None, param_type=None
):
BadParameter.__init__(self, message, ctx, param, param_hint)
self.param_type = param_type
def __str__(self):
if self.message is None:
param_name = self.param.name if self.param else None
return "missing parameter: {}".format(param_name)
else:
return self.message
if PY2:
__unicode__ = __str__
def __str__(self):
return self.__unicode__().encode("utf-8")
[docs]class NoSuchOption(UsageError):
"""Raised if click attempted to handle an option that does not
exist.
.. versionadded:: 4.0
"""
def __init__(self, option_name, message=None, possibilities=None, ctx=None):
if message is None:
message = "no such option: {}".format(option_name)
UsageError.__init__(self, message, ctx)
self.option_name = option_name
self.possibilities = possibilities
[docs]class BadOptionUsage(UsageError):
"""Raised if an option is generally supplied but the use of the option
was incorrect. This is for instance raised if the number of arguments
for an option is not correct.
.. versionadded:: 4.0
:param option_name: the name of the option being used incorrectly.
"""
def __init__(self, option_name, message, ctx=None):
UsageError.__init__(self, message, ctx)
self.option_name = option_name
[docs]class BadArgumentUsage(UsageError):
"""Raised if an argument is generally supplied but the use of the argument
was incorrect. This is for instance raised if the number of values
for an argument is not correct.
.. versionadded:: 6.0
"""
def __init__(self, message, ctx=None):
UsageError.__init__(self, message, ctx)
[docs]class FileError(ClickException):
"""Raised if a file cannot be opened."""
def __init__(self, filename, hint=None):
ui_filename = filename_to_ui(filename)
if hint is None:
hint = "unknown error"
ClickException.__init__(self, hint)
self.ui_filename = ui_filename
self.filename = filename
[docs]class Abort(RuntimeError):
"""An internal signalling exception that signals Click to abort."""
class Exit(RuntimeError):
"""An exception that indicates that the application should exit with some
status code.
:param code: the status code to exit with.
"""
__slots__ = ("exit_code",)
def __init__(self, code=0):
self.exit_code = code