Replace pkg_resources.get_distribution with importlib-metadata

pre_commit/constants.py

@@ -1,7 +1,7 @@
 from __future__ import absolute_import
 from __future__ import unicode_literals
 
-import pkg_resources
+import importlib_metadata  # TODO: importlib.metadata py38?
 
 CONFIG_FILE = '.pre-commit-config.yaml'
 MANIFEST_FILE = '.pre-commit-hooks.yaml'
@@ -18,8 +18,7 @@ INSTALLED_STATE_VERSION = '1'
 # Bump when modifying `empty_template`
 LOCAL_REPO_VERSION = '1'
 
-VERSION = pkg_resources.get_distribution('pre-commit').version
+VERSION = importlib_metadata.version('pre_commit')
-VERSION_PARSED = pkg_resources.parse_version(VERSION)
 
 # `manual` is not invoked by any installed git hook.  See #719
 STAGES = ('commit', 'commit-msg', 'manual', 'push')

pre_commit/repository.py

@@ -8,7 +8,6 @@ import pipes
 import shutil
 import sys
 
-import pkg_resources
 from cached_property import cached_property
 from cfgv import apply_defaults
 from cfgv import validate
@@ -23,6 +22,7 @@ from pre_commit.clientlib import MANIFEST_HOOK_DICT
 from pre_commit.languages.all import languages
 from pre_commit.languages.helpers import environment_dir
 from pre_commit.prefix import Prefix
+from pre_commit.util import parse_version
 
 
 logger = logging.getLogger('pre_commit')
@@ -110,13 +110,13 @@ def _hook(*hook_dicts):
     for dct in rest:
         ret.update(dct)
 
-    version = pkg_resources.parse_version(ret['minimum_pre_commit_version'])
+    version = ret['minimum_pre_commit_version']
-    if version > C.VERSION_PARSED:
+    if parse_version(version) > parse_version(C.VERSION):
         logger.error(
             'The hook `{}` requires pre-commit version {} but version {} '
             'is installed.  '
             'Perhaps run `pip install --upgrade pre-commit`.'.format(
-                ret['id'], version, C.VERSION_PARSED,
+                ret['id'], version, C.VERSION,
             ),
         )
         exit(1)

pre_commit/util.py

@@ -211,3 +211,8 @@ def copy_tree_to_path(src_dir, dest_dir):
             shutil.copytree(srcname, destname)
         else:
             shutil.copy(srcname, destname)
+
+
+def parse_version(s):
+    """poor man's version comparison"""
+    return tuple(int(p) for p in s.split('.'))

setup.py

@@ -40,6 +40,8 @@ setup(
         'cached-property',
         'cfgv>=1.0.0',
         'identify>=1.0.0',
+        # if this makes it into python3.8 move to extras_require
+        'importlib-metadata',
         'nodeenv>=0.11.1',
         'pyyaml',
         'six',

tests/util_test.py

@@ -9,6 +9,7 @@ from pre_commit.util import CalledProcessError
 from pre_commit.util import clean_path_on_failure
 from pre_commit.util import cmd_output
 from pre_commit.util import memoize_by_cwd
+from pre_commit.util import parse_version
 from pre_commit.util import tmpdir
 from testing.util import cwd
 
@@ -117,3 +118,9 @@ def test_cmd_output_exe_not_found():
     ret, out, _ = cmd_output('i-dont-exist', retcode=None)
     assert ret == 1
     assert out == 'Executable `i-dont-exist` not found'
+
+
+def test_parse_version():
+    assert parse_version('0.0') == parse_version('0.0')
+    assert parse_version('0.1') > parse_version('0.0')
+    assert parse_version('2.1') >= parse_version('2')