Repository: pre-commit/pre-commit (python)

Issue:
Global configuration of files / exclude
A top-level entry of `files` and `exclude` that was used as the default by all hooks where those options are not defined would be really useful.


Pull request description:
Implement global exclude
Resolves #281

Patch:
diff --git a/pre_commit/clientlib.py b/pre_commit/clientlib.py
index 7fb49d7..c04cf33 100644
--- a/pre_commit/clientlib.py
+++ b/pre_commit/clientlib.py
@@ -130,6 +130,7 @@ CONFIG_SCHEMA = schema.Map(
     'Config', None,
 
     schema.RequiredRecurse('repos', schema.Array(CONFIG_REPO_DICT)),
+    schema.Optional('exclude', schema.check_regex, '^$'),
     schema.Optional('fail_fast', schema.check_bool, False),
 )
 
diff --git a/pre_commit/commands/run.py b/pre_commit/commands/run.py
index 505bb54..6f69548 100644
--- a/pre_commit/commands/run.py
+++ b/pre_commit/commands/run.py
@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 
 import logging
 import os
+import re
 import subprocess
 import sys
 
@@ -36,7 +37,19 @@ def _hook_msg_start(hook, verbose):
     )
 
 
-def filter_filenames_by_types(filenames, types, exclude_types):
+def _filter_by_include_exclude(filenames, include, exclude):
+    include_re, exclude_re = re.compile(include), re.compile(exclude)
+    return {
+        filename for filename in filenames
+        if (
+            include_re.search(filename) and
+            not exclude_re.search(filename) and
+            os.path.lexists(filename)
+        )
+    }
+
+
+def _filter_by_types(filenames, types, exclude_types):
     types, exclude_types = frozenset(types), frozenset(exclude_types)
     ret = []
     for filename in filenames:
@@ -46,34 +59,15 @@ def filter_filenames_by_types(filenames, types, exclude_types):
     return tuple(ret)
 
 
-def get_filenames(args, include_expr, exclude_expr):
-    if args.origin and args.source:
-        getter = git.get_files_matching(
-            lambda: git.get_changed_files(args.origin, args.source),
-        )
-    elif args.hook_stage == 'commit-msg':
-        def getter(*_):
-            return (args.commit_msg_filename,)
-    elif args.files:
-        getter = git.get_files_matching(lambda: args.files)
-    elif args.all_files:
-        getter = git.get_all_files_matching
-    elif git.is_in_merge_conflict():
-        getter = git.get_conflicted_files_matching
-    else:
-        getter = git.get_staged_files_matching
-    return getter(include_expr, exclude_expr)
-
-
 SKIPPED = 'Skipped'
 NO_FILES = '(no files to check)'
 
 
-def _run_single_hook(hook, repo, args, skips, cols):
-    filenames = get_filenames(args, hook['files'], hook['exclude'])
-    filenames = filter_filenames_by_types(
-        filenames, hook['types'], hook['exclude_types'],
-    )
+def _run_single_hook(filenames, hook, repo, args, skips, cols):
+    include, exclude = hook['files'], hook['exclude']
+    filenames = _filter_by_include_exclude(filenames, include, exclude)
+    types, exclude_types = hook['types'], hook['exclude_types']
+    filenames = _filter_by_types(filenames, types, exclude_types)
     if hook['id'] in skips:
         output.write(get_hook_message(
             _hook_msg_start(hook, args.verbose),
@@ -169,13 +163,30 @@ def _compute_cols(hooks, verbose):
     return max(cols, 80)
 
 
+def _all_filenames(args):
+    if args.origin and args.source:
+        return git.get_changed_files(args.origin, args.source)
+    elif args.hook_stage == 'commit-msg':
+        return (args.commit_msg_filename,)
+    elif args.files:
+        return args.files
+    elif args.all_files:
+        return git.get_all_files()
+    elif git.is_in_merge_conflict():
+        return git.get_conflicted_files()
+    else:
+        return git.get_staged_files()
+
+
 def _run_hooks(config, repo_hooks, args, environ):
     """Actually run the hooks."""
     skips = _get_skips(environ)
     cols = _compute_cols([hook for _, hook in repo_hooks], args.verbose)
+    filenames = _all_filenames(args)
+    filenames = _filter_by_include_exclude(filenames, '', config['exclude'])
     retval = 0
     for repo, hook in repo_hooks:
-        retval |= _run_single_hook(hook, repo, args, skips, cols)
+        retval |= _run_single_hook(filenames, hook, repo, args, skips, cols)
         if retval and config['fail_fast']:
             break
     if (
diff --git a/pre_commit/git.py b/pre_commit/git.py
index cdf807b..1c3191e 100644
--- a/pre_commit/git.py
+++ b/pre_commit/git.py
@@ -1,15 +1,12 @@
 from __future__ import unicode_literals
 
-import functools
 import logging
 import os.path
-import re
 import sys
 
 from pre_commit.errors import FatalError
 from pre_commit.util import CalledProcessError
 from pre_commit.util import cmd_output
-from pre_commit.util import memoize_by_cwd
 
 
 logger = logging.getLogger('pre_commit')
@@ -63,7 +60,6 @@ def parse_merge_msg_for_conflicts(merge_msg):
     ]
 
 
-@memoize_by_cwd
 def get_conflicted_files():
     logger.info('Checking merge-conflict files only.')
     # Need to get the conflicted files from the MERGE_MSG because they could
@@ -82,7 +78,6 @@ def get_conflicted_files():
     return set(merge_conflict_filenames) | set(merge_diff_filenames)
 
 
-@memoize_by_cwd
 def get_staged_files():
     return zsplit(cmd_output(
         'git', 'diff', '--staged', '--name-only', '--no-ext-diff', '-z',
@@ -91,7 +86,6 @@ def get_staged_files():
     )[1])
 
 
-@memoize_by_cwd
 def get_all_files():
     return zsplit(cmd_output('git', 'ls-files', '-z')[1])
 
@@ -103,29 +97,6 @@ def get_changed_files(new, old):
     )[1])
 
 
-def get_files_matching(all_file_list_strategy):
-    @functools.wraps(all_file_list_strategy)
-    @memoize_by_cwd
-    def wrapper(include_expr, exclude_expr):
-        include_regex = re.compile(include_expr)
-        exclude_regex = re.compile(exclude_expr)
-        return {
-            filename
-            for filename in all_file_list_strategy()
-            if (
-                include_regex.search(filename) and
-                not exclude_regex.search(filename) and
-                os.path.lexists(filename)
-            )
-        }
-    return wrapper
-
-
-get_staged_files_matching = get_files_matching(get_staged_files)
-get_all_files_matching = get_files_matching(get_all_files)
-get_conflicted_files_matching = get_files_matching(get_conflicted_files)
-
-
 def check_for_cygwin_mismatch():
     """See https://github.com/pre-commit/pre-commit/issues/354"""
     if sys.platform in ('cygwin', 'win32'):  # pragma: no cover (windows)


Test patch:
diff --git a/tests/commands/run_test.py b/tests/commands/run_test.py
index 53e098b..51e4eac 100644
--- a/tests/commands/run_test.py
+++ b/tests/commands/run_test.py
@@ -12,6 +12,7 @@ import pytest
 import pre_commit.constants as C
 from pre_commit.commands.install_uninstall import install
 from pre_commit.commands.run import _compute_cols
+from pre_commit.commands.run import _filter_by_include_exclude
 from pre_commit.commands.run import _get_skips
 from pre_commit.commands.run import _has_unmerged_paths
 from pre_commit.commands.run import run
@@ -25,6 +26,7 @@ from testing.fixtures import make_consuming_repo
 from testing.fixtures import modify_config
 from testing.fixtures import read_config
 from testing.util import cmd_output_mocked_pre_commit_home
+from testing.util import xfailif_no_symlink
 
 
 @pytest.yield_fixture
@@ -181,6 +183,21 @@ def test_exclude_types_hook_repository(
         assert b'exe' not in printed
 
 
+def test_global_exclude(cap_out, tempdir_factory, mock_out_store_directory):
+    git_path = make_consuming_repo(tempdir_factory, 'script_hooks_repo')
+    with cwd(git_path):
+        with modify_config() as config:
+            config['exclude'] = '^foo.py$'
+        open('foo.py', 'a').close()
+        open('bar.py', 'a').close()
+        cmd_output('git', 'add', '.')
+        ret, printed = _do_run(cap_out, git_path, _get_opts(verbose=True))
+        assert ret == 0
+        # Does not contain foo.py since it was excluded
+        expected = b'hookid: bash_hook\n\nbar.py\nHello World\n\n'
+        assert printed.endswith(expected)
+
+
 def test_show_diff_on_failure(
         capfd, cap_out, tempdir_factory, mock_out_store_directory,
 ):
@@ -744,3 +761,45 @@ def test_fail_fast(
         ret, printed = _do_run(cap_out, repo_with_failing_hook, _get_opts())
         # it should have only run one hook
         assert printed.count(b'Failing hook') == 1
+
+
+@pytest.fixture
+def some_filenames():
+    return (
+        '.pre-commit-hooks.yaml',
+        'pre_commit/main.py',
+        'pre_commit/git.py',
+        'im_a_file_that_doesnt_exist.py',
+    )
+
+
+def test_include_exclude_base_case(some_filenames):
+    ret = _filter_by_include_exclude(some_filenames, '', '^$')
+    assert ret == {
+        '.pre-commit-hooks.yaml',
+        'pre_commit/main.py',
+        'pre_commit/git.py',
+    }
+
+
+@xfailif_no_symlink
+def test_matches_broken_symlink(tmpdir):  # pramga: no cover (non-windows)
+    with tmpdir.as_cwd():
+        os.symlink('does-not-exist', 'link')
+        ret = _filter_by_include_exclude({'link'}, '', '^$')
+        assert ret == {'link'}
+
+
+def test_include_exclude_total_match(some_filenames):
+    ret = _filter_by_include_exclude(some_filenames, r'^.*\.py$', '^$')
+    assert ret == {'pre_commit/main.py', 'pre_commit/git.py'}
+
+
+def test_include_exclude_does_search_instead_of_match(some_filenames):
+    ret = _filter_by_include_exclude(some_filenames, r'\.yaml$', '^$')
+    assert ret == {'.pre-commit-hooks.yaml'}
+
+
+def test_include_exclude_exclude_removes_files(some_filenames):
+    ret = _filter_by_include_exclude(some_filenames, '', r'\.py$')
+    assert ret == {'.pre-commit-hooks.yaml'}
diff --git a/tests/git_test.py b/tests/git_test.py
index 4fce5ab..8417523 100644
--- a/tests/git_test.py
+++ b/tests/git_test.py
@@ -11,7 +11,6 @@ from pre_commit.errors import FatalError
 from pre_commit.util import cmd_output
 from pre_commit.util import cwd
 from testing.fixtures import git_dir
-from testing.util import xfailif_no_symlink
 
 
 def test_get_root_at_root(tempdir_factory):
@@ -66,56 +65,6 @@ def test_cherry_pick_conflict(in_merge_conflict):
     assert git.is_in_merge_conflict() is False
 
 
-@pytest.fixture
-def get_files_matching_func():
-    def get_filenames():
-        return (
-            '.pre-commit-hooks.yaml',
-            'pre_commit/main.py',
-            'pre_commit/git.py',
-            'im_a_file_that_doesnt_exist.py',
-        )
-
-    return git.get_files_matching(get_filenames)
-
-
-def test_get_files_matching_base(get_files_matching_func):
-    ret = get_files_matching_func('', '^$')
-    assert ret == {
-        '.pre-commit-hooks.yaml',
-        'pre_commit/main.py',
-        'pre_commit/git.py',
-    }
-
-
-@xfailif_no_symlink
-def test_matches_broken_symlink(tmpdir):  # pragma: no cover (non-windwos)
-    with tmpdir.as_cwd():
-        os.symlink('does-not-exist', 'link')
-        func = git.get_files_matching(lambda: ('link',))
-        assert func('', '^$') == {'link'}
-
-
-def test_get_files_matching_total_match(get_files_matching_func):
-    ret = get_files_matching_func('^.*\\.py$', '^$')
-    assert ret == {'pre_commit/main.py', 'pre_commit/git.py'}
-
-
-def test_does_search_instead_of_match(get_files_matching_func):
-    ret = get_files_matching_func('\\.yaml$', '^$')
-    assert ret == {'.pre-commit-hooks.yaml'}
-
-
-def test_does_not_include_deleted_fileS(get_files_matching_func):
-    ret = get_files_matching_func('exist.py', '^$')
-    assert ret == set()
-
-
-def test_exclude_removes_files(get_files_matching_func):
-    ret = get_files_matching_func('', '\\.py$')
-    assert ret == {'.pre-commit-hooks.yaml'}
-
-
 def resolve_conflict():
     with open('conflict_file', 'w') as conflicted_file:
         conflicted_file.write('herp\nderp\n')