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#!/usr/bin/python
#
# Simple utility script to manipulate
# certain types of strings in a file
# This can be used in various projects where
# there is the need to replace strings in files,
# and is copied from GLib's $(srcroot)/win32
# Author: Fan, Chun-wei
# Date: September 03, 2014
import sys
import re
import argparse
valid_actions = ['remove-prefix',
'replace-var',
'replace-str',
'remove-str']
def open_file(filename, mode):
if sys.version_info[0] < 3:
return open(filename, mode=mode)
else:
return open(filename, mode=mode, encoding='utf-8')
def replace_multi(src, dest, replace_items):
with open_file(src, 'r') as s:
with open_file(dest, 'w') as d:
for line in s:
replace_dict = dict((re.escape(key), value) \
for key, value in replace_items.items())
replace_pattern = re.compile("|".join(replace_dict.keys()))
d.write(replace_pattern.sub(lambda m: \
replace_dict[re.escape(m.group(0))], line))
def replace(src, dest, instring, outstring):
replace_item = {instring: outstring}
replace_multi(src, dest, replace_item)
def check_required_args(args, params):
for param in params:
if getattr(args, param, None) is None:
raise SystemExit('%s: error: --%s argument is required' % (__file__, param))
def warn_ignored_args(args, params):
for param in params:
if getattr(args, param, None) is not None:
print('%s: warning: --%s argument is ignored' % (__file__, param))
def main(argv):
parser = argparse.ArgumentParser(description='Process strings in a file.')
parser.add_argument('-a',
'--action',
help='Action to carry out. Can be one of:\n'
'remove-prefix\n'
'replace-var\n'
'replace-str\n'
'remove-str',
choices=valid_actions)
parser.add_argument('-i', '--input', help='Input file')
parser.add_argument('-o', '--output', help='Output file')
parser.add_argument('--instring', help='String to replace or remove')
parser.add_argument('--var', help='Autotools variable name to replace')
parser.add_argument('--outstring',
help='New String to replace specified string or variable')
parser.add_argument('--removeprefix', help='Prefix of string to remove')
args = parser.parse_args()
input_string = ''
output_string = ''
# We must have action, input, output for all operations
check_required_args(args, ['action','input','output'])
# Build the arguments by the operation that is to be done,
# to be fed into replace()
# Get rid of prefixes from a string
if args.action == 'remove-prefix':
check_required_args(args, ['instring','removeprefix'])
warn_ignored_args(args, ['outstring','var'])
input_string = args.removeprefix + args.instring
output_string = args.instring
# Replace an m4-style variable (those surrounded by @...@)
if args.action == 'replace-var':
check_required_args(args, ['var','outstring'])
warn_ignored_args(args, ['instring','removeprefix'])
input_string = '@' + args.var + '@'
output_string = args.outstring
# Replace a string
if args.action == 'replace-str':
check_required_args(args, ['instring','outstring'])
warn_ignored_args(args, ['var','removeprefix'])
input_string = args.instring
output_string = args.outstring
# Remove a string
if args.action == 'remove-str':
check_required_args(args, ['instring'])
warn_ignored_args(args, ['var','outstring','removeprefix'])
input_string = args.instring
output_string = ''
replace(args.input, args.output, input_string, output_string)
return 0
if __name__ == '__main__':
sys.exit(main(sys.argv))
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