from __future__ import unicode_literals

import sys

from pre_commit.languages import helpers

from pre_commit.xargs import xargs

ENVIRONMENT_DIR = None

GREP = 'ggrep' if sys.platform == 'darwin' else 'grep'

get_default_version = helpers.basic_get_default_version

healthy = helpers.basic_healthy

install_environment = helpers.no_install

def run_hook(hook, file_args):

# For PCRE the entry is the regular expression to match

cmd = (GREP, '-H', '-n', '-P') + tuple(hook.args) + (hook.entry,)

# Grep usually returns 0 for matches, and nonzero for non-matches so we

# negate it here.

return xargs(cmd, file_args, negate=True)