forked from aws/aws-cli
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathargparser.py
More file actions
190 lines (163 loc) · 7.13 KB
/
argparser.py
File metadata and controls
190 lines (163 loc) · 7.13 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
# Copyright 2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
import argparse
import sys
from awscli.compat import six
from difflib import get_close_matches
HELP_BLURB = (
"To see help text, you can run:\n"
"\n"
" aws help\n"
" aws <command> help\n"
" aws <command> <subcommand> help\n"
)
USAGE = (
"aws [options] <command> <subcommand> [<subcommand> ...] [parameters]\n"
"%s" % HELP_BLURB
)
class CommandAction(argparse.Action):
"""Custom action for CLI command arguments
Allows the choices for the argument to be mutable. The choices
are dynamically retrieved from the keys of the referenced command
table
"""
def __init__(self, option_strings, dest, command_table, **kwargs):
self.command_table = command_table
super(CommandAction, self).__init__(
option_strings, dest, choices=self.choices, **kwargs
)
def __call__(self, parser, namespace, values, option_string=None):
setattr(namespace, self.dest, values)
@property
def choices(self):
return list(self.command_table.keys())
@choices.setter
def choices(self, val):
# argparse.Action will always try to set this value upon
# instantiation, but this value should be dynamically
# generated from the command table keys. So make this a
# NOOP if argparse.Action tries to set this value.
pass
class CLIArgParser(argparse.ArgumentParser):
Formatter = argparse.RawTextHelpFormatter
# When displaying invalid choice error messages,
# this controls how many options to show per line.
ChoicesPerLine = 2
def _check_value(self, action, value):
"""
It's probably not a great idea to override a "hidden" method
but the default behavior is pretty ugly and there doesn't
seem to be any other way to change it.
"""
# converted value must be one of the choices (if specified)
if action.choices is not None and value not in action.choices:
msg = ['Invalid choice, valid choices are:\n']
for i in range(len(action.choices))[::self.ChoicesPerLine]:
current = []
for choice in action.choices[i:i+self.ChoicesPerLine]:
current.append('%-40s' % choice)
msg.append(' | '.join(current))
possible = get_close_matches(value, action.choices, cutoff=0.8)
if possible:
extra = ['\n\nInvalid choice: %r, maybe you meant:\n' % value]
for word in possible:
extra.append(' * %s' % word)
msg.extend(extra)
raise argparse.ArgumentError(action, '\n'.join(msg))
def parse_known_args(self, args, namespace=None):
parsed, remaining = super(CLIArgParser, self).parse_known_args(args, namespace)
terminal_encoding = getattr(sys.stdin, 'encoding', 'utf-8')
if terminal_encoding is None:
# In some cases, sys.stdin won't have an encoding set,
# (e.g if it's set to a StringIO). In this case we just
# default to utf-8.
terminal_encoding = 'utf-8'
for arg, value in vars(parsed).items():
if isinstance(value, six.binary_type):
setattr(parsed, arg, value.decode(terminal_encoding))
elif isinstance(value, list):
encoded = []
for v in value:
if isinstance(v, six.binary_type):
encoded.append(v.decode(terminal_encoding))
else:
encoded.append(v)
setattr(parsed, arg, encoded)
return parsed, remaining
class MainArgParser(CLIArgParser):
Formatter = argparse.RawTextHelpFormatter
def __init__(self, command_table, version_string,
description, argument_table, prog=None):
super(MainArgParser, self).__init__(
formatter_class=self.Formatter,
add_help=False,
conflict_handler='resolve',
description=description,
usage=USAGE,
prog=prog)
self._build(command_table, version_string, argument_table)
def _create_choice_help(self, choices):
help_str = ''
for choice in sorted(choices):
help_str += '* %s\n' % choice
return help_str
def _build(self, command_table, version_string, argument_table):
for argument_name in argument_table:
argument = argument_table[argument_name]
argument.add_to_parser(self)
self.add_argument('--version', action="version",
version=version_string,
help='Display the version of this tool')
self.add_argument('command', action=CommandAction,
command_table=command_table)
class ServiceArgParser(CLIArgParser):
def __init__(self, operations_table, service_name):
super(ServiceArgParser, self).__init__(
formatter_class=argparse.RawTextHelpFormatter,
add_help=False,
conflict_handler='resolve',
usage=USAGE)
self._build(operations_table)
self._service_name = service_name
def _build(self, operations_table):
self.add_argument('operation', action=CommandAction,
command_table=operations_table)
class ArgTableArgParser(CLIArgParser):
"""CLI arg parser based on an argument table."""
def __init__(self, argument_table, command_table=None):
# command_table is an optional subcommand_table. If it's passed
# in, then we'll update the argparse to parse a 'subcommand' argument
# and populate the choices field with the command table keys.
super(ArgTableArgParser, self).__init__(
formatter_class=self.Formatter,
add_help=False,
usage=USAGE,
conflict_handler='resolve')
if command_table is None:
command_table = {}
self._build(argument_table, command_table)
def _build(self, argument_table, command_table):
for arg_name in argument_table:
argument = argument_table[arg_name]
argument.add_to_parser(self)
if command_table:
self.add_argument('subcommand', action=CommandAction,
command_table=command_table, nargs='?')
def parse_known_args(self, args, namespace=None):
if len(args) == 1 and args[0] == 'help':
namespace = argparse.Namespace()
namespace.help = 'help'
return namespace, []
else:
return super(ArgTableArgParser, self).parse_known_args(
args, namespace)