#!/usr/bin/python3

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


from io import BytesIO
from os import close, pipe, write
from subprocess import call
from sys import argv, exit, stderr, stdin, stdout


info = '''
gobble [command...] [args...]

Read all bytes from standard input, and only then emit them out, or run
the command given, sending those bytes to its standard input.
'''


if len(argv) > 1 and argv[1] in ('-h', '--h', '-help', '--help'):
    print(info.strip())
    exit(0)


try:
    if len(argv) > 1:
        r, w = pipe()
        data = stdin.buffer.read()
        # os.write always hangs when given more than a few kilobytes
        chunk_size = 4 * 1024
        while len(data) >= chunk_size:
            write(w, data[:chunk_size])
            data = data[chunk_size:]
        write(w, data)
        close(w)
        exit(call(argv[1:], stdin=r, stdout=stdout, stderr=stderr))
    else:
        stdout.buffer.write(stdin.buffer.read())
except BrokenPipeError:
    stderr.close()
    exit(0)
except KeyboardInterrupt:
    exit(2)
except Exception as e:
    print(f'\x1b[31m{e}\x1b[0m', file=stderr)
    exit(1)