Remove deprecated pcre language

pre_commit/commands/run.py

@@ -82,14 +82,6 @@ def _subtle_line(s, use_color):
 def _run_single_hook(classifier, hook, skips, cols, verbose, use_color):
     filenames = classifier.filenames_for_hook(hook)
 
-    if hook.language == 'pcre':
-        logger.warning(
-            '`{}` (from {}) uses the deprecated pcre language.\n'
-            'The pcre language is scheduled for removal in pre-commit 2.x.\n'
-            'The pygrep language is a more portable (and usually drop-in) '
-            'replacement.'.format(hook.id, hook.src),
-        )
-
     if hook.id in skips or hook.alias in skips:
         output.write(
             get_hook_message(

pre_commit/languages/all.py

@@ -6,7 +6,6 @@ from pre_commit.languages import docker_image
 from pre_commit.languages import fail
 from pre_commit.languages import golang
 from pre_commit.languages import node
-from pre_commit.languages import pcre
 from pre_commit.languages import pygrep
 from pre_commit.languages import python
 from pre_commit.languages import python_venv
@@ -59,7 +58,6 @@ languages = {
     'fail': fail,
     'golang': golang,
     'node': node,
-    'pcre': pcre,
     'pygrep': pygrep,
     'python': python,
     'python_venv': python_venv,

pre_commit/languages/pcre.py

@@ -1,22 +0,0 @@
-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, color):
-    # 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, color=color)

pre_commit/repository.py

@@ -149,7 +149,7 @@ def _hook(*hook_dicts, **kwargs):
 def _non_cloned_repository_hooks(repo_config, store, root_config):
     def _prefix(language_name, deps):
         language = languages[language_name]
-        # pcre / pygrep / script / system / docker_image do not have
+        # pygrep / script / system / docker_image do not have
         # environments so they work out of the current directory
         if language.ENVIRONMENT_DIR is None:
             return Prefix(os.getcwd())

pre_commit/xargs.py

@@ -107,11 +107,9 @@ def xargs(cmd, varargs, **kwargs):
     """A simplified implementation of xargs.
 
     color: Make a pty if on a platform that supports it
-    negate: Make nonzero successful and zero a failure
     target_concurrency: Target number of partitions to run concurrently
     """
     color = kwargs.pop('color', False)
-    negate = kwargs.pop('negate', False)
     target_concurrency = kwargs.pop('target_concurrency', 1)
     max_length = kwargs.pop('_max_length', _get_platform_max_length())
     cmd_fn = cmd_output_p if color else cmd_output_b
@@ -135,8 +133,6 @@ def xargs(cmd, varargs, **kwargs):
         results = thread_map(run_cmd_partition, partitions)
 
         for proc_retcode, proc_out, _ in results:
-            if negate:
-                proc_retcode = not proc_retcode
             retcode = max(retcode, proc_retcode)
             stdout += proc_out