/
generate_aliases.py
executable file
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/
generate_aliases.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
from __future__ import print_function
import itertools
import os.path
import sys
try:
xrange # Python 2
except NameError:
xrange = range # Python 3
def main():
# (alias, full, allow_when_oneof, incompatible_with)
cmds = [('k', 'kubectl', None, None)]
globs = [('sys', '--namespace=kube-system', None, None)]
ops = [
('a', 'apply --recursive -f', None, None),
('ak', 'apply -k', None, ['sys']),
('k', 'kustomize', None, ['sys']),
('ex', 'exec -i -t', None, None),
('lo', 'logs -f', None, None),
('lop', 'logs -f -p', None, None),
('p', 'proxy', None, ['sys']),
('pf', 'port-forward', None, ['sys']),
('g', 'get', None, None),
('d', 'describe', None, None),
('rm', 'delete', None, None),
('run', 'run --rm --restart=Never --image-pull-policy=IfNotPresent -i -t', None, None),
]
res = [
('po', 'pods', ['g', 'd', 'rm'], None),
('dep', 'deployment', ['g', 'd', 'rm'], None),
('sts', 'statefulset', ['g', 'd', 'rm'], None),
('svc', 'service', ['g', 'd', 'rm'], None),
('ing', 'ingress', ['g', 'd', 'rm'], None),
('cm', 'configmap', ['g', 'd', 'rm'], None),
('sec', 'secret', ['g', 'd', 'rm'], None),
('no', 'nodes', ['g', 'd'], ['sys']),
('ns', 'namespaces', ['g', 'd', 'rm'], ['sys']),
]
res_types = [r[0] for r in res]
args = [
('oyaml', '-o=yaml', ['g'], ['owide', 'ojson', 'sl']),
('owide', '-o=wide', ['g'], ['oyaml', 'ojson']),
('ojson', '-o=json', ['g'], ['owide', 'oyaml', 'sl']),
('all', '--all-namespaces', ['g', 'd'], ['rm', 'f', 'no', 'sys']),
('sl', '--show-labels', ['g'], ['oyaml', 'ojson'], None),
('all', '--all', ['rm'], None), # caution: reusing the alias
('w', '--watch', ['g'], ['oyaml', 'ojson', 'owide']),
]
# these accept a value, so they need to be at the end and
# mutually exclusive within each other.
positional_args = [('f', '--recursive -f', ['g', 'd', 'rm'], res_types + ['all'
, 'l', 'sys']), ('l', '-l', ['g', 'd', 'rm'], ['f',
'all']), ('n', '--namespace', ['g', 'd', 'rm',
'lo', 'ex', 'pf'], ['ns', 'no', 'sys', 'all'])]
# [(part, optional, take_exactly_one)]
parts = [
(cmds, False, True),
(globs, True, False),
(ops, True, True),
(res, True, True),
(args, True, False),
(positional_args, True, True),
]
shellFormatting = {
"bash": "alias {}='{}'",
"zsh": "alias {}='{}'",
"fish": "abbr --add {} \"{}\"",
}
shell = sys.argv[1] if len(sys.argv) > 1 else "bash"
if shell not in shellFormatting:
raise ValueError("Shell \"{}\" not supported. Options are {}"
.format(shell, [key for key in shellFormatting]))
out = gen(parts)
# prepare output
if not sys.stdout.isatty():
header_path = \
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'license_header')
with open(header_path, 'r') as f:
print(f.read())
seen_aliases = set()
for cmd in out:
alias = ''.join([a[0] for a in cmd])
command = ' '.join([a[1] for a in cmd])
if alias in seen_aliases:
print("Alias conflict detected: {}".format(alias), file=sys.stderr)
seen_aliases.add(alias)
print(shellFormatting[shell].format(alias, command))
def gen(parts):
out = [()]
for (items, optional, take_exactly_one) in parts:
orig = list(out)
combos = []
if optional and take_exactly_one:
combos = combos.append([])
if take_exactly_one:
combos = combinations(items, 1, include_0=optional)
else:
combos = combinations(items, len(items), include_0=optional)
# permutate the combinations if optional (args are not positional)
if optional:
new_combos = []
for c in combos:
new_combos += list(itertools.permutations(c))
combos = new_combos
new_out = []
for segment in combos:
for stuff in orig:
if is_valid(stuff + segment):
new_out.append(stuff + segment)
out = new_out
return out
def is_valid(cmd):
return is_valid_requirements(cmd) and is_valid_incompatibilities(cmd)
def is_valid_requirements(cmd):
parts = {c[0] for c in cmd}
for i in range(0, len(cmd)):
# check at least one of requirements are in the cmd
requirements = cmd[i][2]
if requirements and len(parts & set(requirements)) == 0:
return False
return True
def is_valid_incompatibilities(cmd):
parts = {c[0] for c in cmd}
for i in range(0, len(cmd)):
# check none of the incompatibilities are in the cmd
incompatibilities = cmd[i][3]
if incompatibilities and len(parts & set(incompatibilities)) > 0:
return False
return True
def combinations(a, n, include_0=True):
l = []
for j in xrange(0, n + 1):
if not include_0 and j == 0:
continue
cs = itertools.combinations(a, j)
# check incompatibilities early
cs = (c for c in cs if is_valid_incompatibilities(c))
l += list(cs)
return l
def diff(a, b):
return list(set(a) - set(b))
if __name__ == '__main__':
main()