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#!/usr/bin/env python3
# ===----------------------------------------------------------------------===##
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
# ===----------------------------------------------------------------------===##
from argparse import ArgumentParser
import sys
def print_and_exit(msg):
sys.stderr.write(msg + "\n")
sys.exit(1)
def main():
parser = ArgumentParser(description="Concatenate two files into a single file")
parser.add_argument(
"-o",
"--output",
dest="output",
required=True,
help="The output file. stdout is used if not given",
type=str,
action="store",
)
parser.add_argument(
"files", metavar="files", nargs="+", help="The files to concatenate"
)
args = parser.parse_args()
if len(args.files) < 2:
print_and_exit("fewer than 2 inputs provided")
data = ""
for filename in args.files:
with open(filename, "r") as f:
data += f.read()
if len(data) != 0 and data[-1] != "\n":
data += "\n"
assert len(data) > 0 and "cannot cat empty files"
with open(args.output, "w") as f:
f.write(data)
if __name__ == "__main__":
main()
sys.exit(0)
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