56 lines
1.5 KiB
Python
Executable File
56 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2019 The Chromium Authors
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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#
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# This utility concatenates several files into one. On Unix-like systems
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# it is equivalent to:
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# cat file1 file2 file3 ...files... > target
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#
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# The reason for writing a separate utility is that 'cat' is not available
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# on all supported build platforms, but Python is, and hence this provides
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# us with an easy and uniform way of doing this on all platforms.
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# for py2/py3 compatibility
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from __future__ import print_function
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import optparse
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import sys
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def Concatenate(filenames):
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"""Concatenate files.
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Args:
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files: Array of file names.
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The last name is the target; all earlier ones are sources.
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Returns:
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True, if the operation was successful.
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"""
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if len(filenames) < 2:
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print("An error occurred generating %s:\nNothing to do." % filenames[-1])
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return False
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try:
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with open(filenames[-1], "wb") as target:
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for filename in filenames[:-1]:
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with open(filename, "rb") as current:
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target.write(current.read())
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return True
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except IOError as e:
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print("An error occurred when writing %s:\n%s" % (filenames[-1], e))
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return False
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def main():
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parser = optparse.OptionParser()
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parser.set_usage("""Concatenate several files into one.
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Equivalent to: cat file1 ... > target.""")
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(_options, args) = parser.parse_args()
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sys.exit(0 if Concatenate(args) else 1)
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if __name__ == "__main__":
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main()
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