Implement no-dependency system and script hook types. Closes #39.

example_hooks.yaml

@@ -23,4 +23,5 @@
     name: My Bash Based Hook
     description: This is a hook that uses grep to validate some stuff
     entry: ./my_grep_based_hook.sh
+    language: script
     expected_return_value: 1

pre_commit/clientlib/validate_manifest.py

@@ -6,6 +6,7 @@ import sys
 
 import pre_commit.constants as C
 from pre_commit.clientlib.validate_base import get_validator
+from pre_commit.languages.all import all_languages
 from pre_commit.util import entry
 
 
@@ -25,7 +26,7 @@ MANIFEST_JSON_SCHEMA = {
             'language': {'type': 'string'},
             'expected_return_value': {'type': 'number'},
         },
-        'required': ['id', 'name', 'entry'],
+        'required': ['id', 'name', 'entry', 'language'],
     },
 }
 
@@ -35,13 +36,13 @@ def additional_manifest_check(obj):
         language = hook_config.get('language')
 
         if language is not None and not any(
-            language.startswith(lang) for lang in C.SUPPORTED_LANGUAGES
+            language.startswith(lang) for lang in all_languages
         ):
             raise InvalidManifestError(
                 'Expected language {0} for {1} to start with one of {2!r}'.format(
                     hook_config['id'],
                     hook_config['language'],
-                    C.SUPPORTED_LANGUAGES,
+                    all_languages,
                 )
             )
 

pre_commit/constants.py

@@ -5,13 +5,6 @@ HOOKS_WORKSPACE = '.pre-commit-files'
 
 MANIFEST_FILE = 'hooks.yaml'
 
-SUPPORTED_LANGUAGES = set([
-    'python',
-    'ruby',
-    'node',
-])
-
-
 YAML_DUMP_KWARGS = {
     'default_flow_style': False,
     'indent': 4,

pre_commit/languages/all.py

@@ -2,6 +2,8 @@
 from pre_commit.languages import node
 from pre_commit.languages import python
 from pre_commit.languages import ruby
+from pre_commit.languages import script
+from pre_commit.languages import system
 
 # A language implements the following two functions in its module:
 #
@@ -29,4 +31,9 @@ languages = {
     'node': node,
     'python': python,
     'ruby': ruby,
+    'script': script,
+    'system': system,
 }
+
+
+all_languages = languages.keys()

pre_commit/languages/script.py

@@ -0,0 +1,13 @@
+
+def install_environment(repo_cmd_runner):
+    """Installation for script type is a noop."""
+    pass
+
+
+def run_hook(repo_cmd_runner, hook, file_args):
+    return repo_cmd_runner.run(
+        ['xargs', '{{prefix}}{0}'.format(hook['entry'])] + hook.get('args', []),
+        # TODO: this is duplicated in pre_commit/languages/helpers.py
+        stdin='\n'.join(list(file_args) + ['']),
+        retcode=None,
+    )

pre_commit/languages/system.py

@@ -0,0 +1,13 @@
+
+def install_environment(repo_cmd_runner):
+    """Installation for system type is a noop."""
+    pass
+
+
+def run_hook(repo_cmd_runner, hook, file_args):
+    return repo_cmd_runner.run(
+        ['xargs', hook['entry']] + hook.get('args', []),
+        # TODO: this is duplicated in pre_commit/languages/helpers.py
+        stdin='\n'.join(list(file_args) + ['']),
+        retcode=None,
+    )

pre_commit/repository.py

@@ -82,9 +82,8 @@ class Repository(object):
         """
         self.require_created()
         repo_cmd_runner = self.get_cmd_runner(cmd_runner)
-        for language in C.SUPPORTED_LANGUAGES:
-            if language in self.languages:
-                languages[language].install_environment(repo_cmd_runner)
+        for language in self.languages:
+            languages[language].install_environment(repo_cmd_runner)
 
     @contextlib.contextmanager
     def in_checkout(self):

testing/resources/prints_cwd_repo/hooks.yaml

@@ -1,4 +1,4 @@
 -   id: prints_cwd
     name: Prints Cwd
-    entry: prints_cwd
-    language: python
+    entry: pwd
+    language: system

testing/resources/script_hooks_repo/bin/hook.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+echo $@
+echo 'Hello World'

testing/resources/script_hooks_repo/hooks.yaml

@@ -0,0 +1,4 @@
+-   id: bash_hook
+    name: Bash hook
+    entry: bin/hook.sh
+    language: script

tests/clientlib/validate_manifest_test.py

@@ -45,7 +45,7 @@ def is_valid_according_to_schema(obj, schema):
 
 @pytest.mark.parametrize(('manifest_obj', 'expected'), (
     ([], False),
-    ([{'id': 'a', 'name': 'b', 'entry': 'c'}], True),
+    ([{'id': 'a', 'name': 'b', 'entry': 'c', 'language': 'python'}], True),
     (
         [{
              'id': 'a',

tests/conftest.py

@@ -59,45 +59,36 @@ def prints_cwd_repo(dummy_git_repo):
 
 
 @pytest.yield_fixture
-def config_for_node_hooks_repo(node_hooks_repo):
+def script_hooks_repo(dummy_git_repo):
+    yield _make_repo(dummy_git_repo, 'script_hooks_repo')
+
+
+def _make_config(path, hook_id, file_regex):
     config = {
-        'repo': node_hooks_repo,
-        'sha': git.get_head_sha(node_hooks_repo),
-        'hooks': [{
-            'id': 'foo',
-            'files': '\.js$',
-        }],
+        'repo': path,
+        'sha': git.get_head_sha(path),
+        'hooks': [{'id': hook_id, 'files': file_regex}],
     }
     jsonschema.validate([config], CONFIG_JSON_SCHEMA)
     validate_config_extra([config])
-    yield config
+    return config
+
+
+@pytest.yield_fixture
+def config_for_node_hooks_repo(node_hooks_repo):
+    yield _make_config(node_hooks_repo, 'foo', '\.js$')
 
 
 @pytest.yield_fixture
 def config_for_python_hooks_repo(python_hooks_repo):
-    config = {
-        'repo': python_hooks_repo,
-        'sha': git.get_head_sha(python_hooks_repo),
-        'hooks': [{
-            'id': 'foo',
-            'files': '\.py$',
-        }],
-    }
-    jsonschema.validate([config], CONFIG_JSON_SCHEMA)
-    validate_config_extra([config])
-    yield config
+    yield _make_config(python_hooks_repo, 'foo', '\.py$')
 
 
 @pytest.yield_fixture
 def config_for_prints_cwd_repo(prints_cwd_repo):
-    config = {
-        'repo': prints_cwd_repo,
-        'sha': git.get_head_sha(prints_cwd_repo),
-        'hooks': [{
-            'id': 'prints_cwd',
-            'files': '\.py$',
-        }],
-    }
-    jsonschema.validate([config], CONFIG_JSON_SCHEMA)
-    validate_config_extra([config])
-    yield config
+    yield _make_config(prints_cwd_repo, 'prints_cwd', '^$')
+
+
+@pytest.yield_fixture
+def config_for_script_hooks_repo(script_hooks_repo):
+    yield _make_config(script_hooks_repo, 'bash_hook', '^$')

tests/languages/all_test.py

@@ -1,15 +1,11 @@
 
 import pytest
 
-import pre_commit.constants as C
+from pre_commit.languages.all import all_languages
 from pre_commit.languages.all import languages
 
 
-def test_all_languages_have_repo_setups():
-    assert set(languages.keys()) == C.SUPPORTED_LANGUAGES
-
-
-@pytest.mark.parametrize('language', C.SUPPORTED_LANGUAGES)
+@pytest.mark.parametrize('language', all_languages)
 def test_all_languages_support_interface(language):
     assert hasattr(languages[language], 'install_environment')
     assert hasattr(languages[language], 'run_hook')

tests/repository_test.py

@@ -67,6 +67,7 @@ def test_run_a_hook_lots_of_files(config_for_python_hooks_repo):
 
 @pytest.mark.integration
 def test_cwd_of_hook(config_for_prints_cwd_repo):
+    # Note: this doubles as a test for `system` hooks
     repo = Repository(config_for_prints_cwd_repo)
     ret = repo.run_hook(
         PrefixedCommandRunner(C.HOOKS_WORKSPACE), 'prints_cwd', [],
@@ -89,6 +90,17 @@ def test_run_a_node_hook(config_for_node_hooks_repo):
     assert ret[1] == 'Hello World\n'
 
 
+@pytest.mark.integration
+def test_run_a_script_hook(config_for_script_hooks_repo):
+    repo = Repository(config_for_script_hooks_repo)
+    ret = repo.run_hook(
+        PrefixedCommandRunner(C.HOOKS_WORKSPACE), 'bash_hook', ['bar'],
+    )
+
+    assert ret[0] == 0
+    assert ret[1] == 'bar\nHello World\n'
+
+
 @pytest.fixture
 def mock_repo_config():
     config = {