#!/usr/bin/env python3
# Copyright 2017 The Kubernetes Authors.
#
# 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
#
# http://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.
"""Extract strings from command files and externalize into translation files.
Expects to be run from the root directory of the repository.
Usage:
extract.py pkg/kubectl/cmd/apply.go
"""
import fileinput
import sys
import re
class MatchHandler(object):
""" Simple holder for a regular expression and a function
to run if that regular expression matches a line.
The function should expect (re.match, file, linenumber) as parameters
"""
def __init__(self, regex, replace_fn):
self.regex = re.compile(regex)
self.replace_fn = replace_fn
def short_replace(match, file, line_number):
"""Replace a Short: ... cobra command description with an internationalization
"""
sys.stdout.write('{}i18n.T({}),\n'.format(match.group(1), match.group(2)))
SHORT_MATCH = MatchHandler(r'(\s+Short:\s+)("[^"]+"),', short_replace)
def import_replace(match, file, line_number):
"""Add an extra import for the i18n library.
Doesn't try to be smart and detect if it's already present, assumes a
gofmt round wil fix things.
"""
sys.stdout.write('{}\n"k8s.io/kubectl/pkg/util/i18n"\n'.format(match.group(1)))
IMPORT_MATCH = MatchHandler('(.*"k8s.io/kubectl/pkg/cmd/util")', import_replace)
def string_flag_replace(match, file, line_number):
"""Replace a cmd.Flags().String("...", "", "...") with an internationalization
"""
sys.stdout.write('{}i18n.T("{})"))\n'.format(match.group(1), match.group(2)))
STRING_FLAG_MATCH = MatchHandler('(\s+cmd\.Flags\(\).String\("[^"]*", "[^"]*", )"([^"]*)"\)', string_flag_replace)
def long_string_replace(match, file, line_number):
return '{}i18n.T({}){}'.format(match.group(1), match.group(2), match.group(3))
LONG_DESC_MATCH = MatchHandler('(LongDesc\()(`[^`]+`)([^\n]\n)', long_string_replace)
EXAMPLE_MATCH = MatchHandler('(Examples\()(`[^`]+`)([^\n]\n)', long_string_replace)
def replace(filename, matchers, multiline_matchers):
"""Given a file and a set of matchers, run those matchers
across the file and replace it with the results.
"""
# Run all the matchers
line_number = 0
for line in fileinput.input(filename, inplace=True):
line_number += 1
matched = False
for matcher in matchers:
match = matcher.regex.match(line)
if match:
matcher.replace_fn(match, filename, line_number)
matched = True
break
if not matched:
sys.stdout.write(line)
sys.stdout.flush()
with open(filename, 'r') as datafile:
content = datafile.read()
for matcher in multiline_matchers:
match = matcher.regex.search(content)
while match:
rep = matcher.replace_fn(match, filename, 0)
# Escape back references in the replacement string
# (And escape for Python)
# (And escape for regex)
rep = re.sub('\\\\(\\d)', '\\\\\\\\\\1', rep)
content = matcher.regex.sub(rep, content, 1)
match = matcher.regex.search(content)
sys.stdout.write(content)
# gofmt the file again
from subprocess import call
call(["goimports", "-w", filename])
replace(sys.argv[1], [SHORT_MATCH, IMPORT_MATCH, STRING_FLAG_MATCH], [LONG_DESC_MATCH, EXAMPLE_MATCH])
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