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from __future__ import absolute_import

from __future__ import unicode_literals

from pre_commit import parse_shebang

from pre_commit.util import cmd_output

# Limit used previously to avoid "xargs ... Bad file number" on windows

# This is slightly less than the posix mandated minimum

MAX_LENGTH = 4000

class ArgumentTooLongError(RuntimeError):

pass

def partition(cmd, varargs, _max_length=MAX_LENGTH):

cmd = tuple(cmd)

ret = []

ret_cmd = []

total_len = len(' '.join(cmd))

# Reversed so arguments are in order

varargs = list(reversed(varargs))

while varargs:

arg = varargs.pop()

if total_len + 1 + len(arg) <= _max_length:

ret_cmd.append(arg)

total_len += len(arg)

elif not ret_cmd:

raise ArgumentTooLongError(arg)

else:

# We've exceeded the length, yield a command

ret.append(cmd + tuple(ret_cmd))

ret_cmd = []

total_len = len(' '.join(cmd))

varargs.append(arg)

ret.append(cmd + tuple(ret_cmd))

return tuple(ret)

def xargs(cmd, varargs, **kwargs):

"""A simplified implementation of xargs.

negate: Make nonzero successful and zero a failure

"""

negate = kwargs.pop('negate', False)

retcode = 0

stdout = b''

stderr = b''

try:

parse_shebang.normexe(cmd[0])

except parse_shebang.ExecutableNotFoundError as e:

return e.to_output()

for run_cmd in partition(cmd, varargs, **kwargs):

proc_retcode, proc_out, proc_err = cmd_output(

*run_cmd, encoding=None, retcode=None

)

# This is *slightly* too clever so I'll explain it.

# First the xor boolean table:

# T | F |

# +-------+

# T | F | T |

# --+-------+

# F | T | F |

# --+-------+

# When negate is True, it has the effect of flipping the return code

# Otherwise, the retuncode is unchanged

retcode |= bool(proc_retcode) ^ negate

stdout += proc_out

stderr += proc_err

return retcode, stdout, stderr

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