mirror of
https://github.com/pre-commit/pre-commit.git
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96 lines
2.5 KiB
Python
96 lines
2.5 KiB
Python
from __future__ import absolute_import
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from __future__ import unicode_literals
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import sys
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from pre_commit import parse_shebang
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from pre_commit.util import cmd_output
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# TODO: properly compute max_length value
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def _get_platform_max_length():
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# posix minimum
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return 4 * 1024
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def _command_length(*cmd):
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full_cmd = ' '.join(cmd)
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# win32 uses the amount of characters, more details at:
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# https://blogs.msdn.microsoft.com/oldnewthing/20031210-00/?p=41553/
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if sys.platform == 'win32':
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return len(full_cmd)
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return len(full_cmd.encode(sys.getfilesystemencoding()))
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class ArgumentTooLongError(RuntimeError):
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pass
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def partition(cmd, varargs, _max_length=None):
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_max_length = _max_length or _get_platform_max_length()
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cmd = tuple(cmd)
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ret = []
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ret_cmd = []
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# Reversed so arguments are in order
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varargs = list(reversed(varargs))
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total_length = _command_length(*cmd)
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while varargs:
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arg = varargs.pop()
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arg_length = _command_length(arg) + 1
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if total_length + arg_length <= _max_length:
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ret_cmd.append(arg)
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total_length += arg_length
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elif not ret_cmd:
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raise ArgumentTooLongError(arg)
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else:
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# We've exceeded the length, yield a command
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ret.append(cmd + tuple(ret_cmd))
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ret_cmd = []
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total_length = _command_length(*cmd)
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varargs.append(arg)
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ret.append(cmd + tuple(ret_cmd))
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return tuple(ret)
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def xargs(cmd, varargs, **kwargs):
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"""A simplified implementation of xargs.
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negate: Make nonzero successful and zero a failure
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"""
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negate = kwargs.pop('negate', False)
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retcode = 0
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stdout = b''
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stderr = b''
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try:
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parse_shebang.normexe(cmd[0])
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except parse_shebang.ExecutableNotFoundError as e:
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return e.to_output()
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for run_cmd in partition(cmd, varargs, **kwargs):
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proc_retcode, proc_out, proc_err = cmd_output(
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*run_cmd, encoding=None, retcode=None
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)
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# This is *slightly* too clever so I'll explain it.
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# First the xor boolean table:
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# T | F |
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# +-------+
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# T | F | T |
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# --+-------+
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# F | T | F |
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# --+-------+
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# When negate is True, it has the effect of flipping the return code
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# Otherwise, the retuncode is unchanged
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retcode |= bool(proc_retcode) ^ negate
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stdout += proc_out
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stderr += proc_err
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return retcode, stdout, stderr
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