mirror of
https://github.com/pre-commit/pre-commit.git
synced 2026-01-13 12:30:08 -06:00
80 lines
2.1 KiB
Python
80 lines
2.1 KiB
Python
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
|