v8/tools/concatenate-files.py

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#!/usr/bin/env python
#
# Copyright 2014 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# This utility concatenates several files into one. On Unix-like systems
# it is equivalent to:
# cat file1 file2 file3 ...files... > target
#
# The reason for writing a seperate utility is that 'cat' is not available
# on all supported build platforms, but Python is, and hence this provides
# us with an easy and uniform way of doing this on all platforms.
import optparse
def Concatenate(filenames):
"""Concatenate files.
Args:
files: Array of file names.
The last name is the target; all earlier ones are sources.
Returns:
True, if the operation was successful.
"""
if len(filenames) < 2:
print "An error occured generating %s:\nNothing to do." % filenames[-1]
return False
try:
with open(filenames[-1], "wb") as target:
for filename in filenames[:-1]:
with open(filename, "rb") as current:
target.write(current.read())
return True
except IOError as e:
print "An error occured when writing %s:\n%s" % (filenames[-1], e)
return False
def main():
parser = optparse.OptionParser()
parser.set_usage("""Concatenate several files into one.
Equivalent to: cat file1 ... > target.""")
(options, args) = parser.parse_args()
exit(0 if Concatenate(args) else 1)
if __name__ == "__main__":
main()