Add --quiet to the hook-impl command.

Can now add --quiet to the scripts like
.git/hooks/pre-commit to run in quiet mode.

pre_commit/commands/hook_impl.py

@@ -75,6 +75,7 @@ def _ns(
         remote_url: Optional[str] = None,
         commit_msg_filename: Optional[str] = None,
         checkout_type: Optional[str] = None,
+        quiet: bool = False,
 ) -> argparse.Namespace:
     return argparse.Namespace(
         color=color,
@@ -89,7 +90,7 @@ def _ns(
         files=(),
         hook=None,
         verbose=False,
-        quiet=False,
+        quiet=quiet,
         show_diff_on_failure=False,
     )
 
@@ -180,6 +181,7 @@ def _check_args_length(hook_type: str, args: Sequence[str]) -> None:
 def _run_ns(
         hook_type: str,
         color: bool,
+        quiet: bool,
         args: Sequence[str],
         stdin: bytes,
 ) -> Optional[argparse.Namespace]:
@@ -189,7 +191,7 @@ def _run_ns(
     elif hook_type in {'commit-msg', 'prepare-commit-msg'}:
         return _ns(hook_type, color, commit_msg_filename=args[0])
     elif hook_type in {'post-commit', 'pre-merge-commit', 'pre-commit'}:
-        return _ns(hook_type, color)
+        return _ns(hook_type, color, quiet=quiet)
     elif hook_type == 'post-checkout':
         return _ns(
             hook_type, color,
@@ -207,11 +209,12 @@ def hook_impl(
         hook_type: str,
         hook_dir: str,
         skip_on_missing_config: bool,
+        quiet: bool,
         args: Sequence[str],
 ) -> int:
     retv, stdin = _run_legacy(hook_type, hook_dir, args)
     _validate_config(retv, config, skip_on_missing_config)
-    ns = _run_ns(hook_type, color, args, stdin)
+    ns = _run_ns(hook_type, color, quiet, args, stdin)
     if ns is None:
         return retv
     else:

pre_commit/main.py

@@ -222,6 +222,11 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
     hook_impl_parser.add_argument(
         '--skip-on-missing-config', action='store_true',
     )
+    hook_impl_parser.add_argument(
+        '--quiet', action='store_true', default=False,
+        help='Enable quiet mode (in post-commit, pre-merge-commit, '
+        'pre-commit hooks).',
+    )
     hook_impl_parser.add_argument(dest='rest', nargs=argparse.REMAINDER)
 
     gc_parser = subparsers.add_parser('gc', help='Clean unused cached repos.')
@@ -370,6 +375,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
                 hook_type=args.hook_type,
                 hook_dir=args.hook_dir,
                 skip_on_missing_config=args.skip_on_missing_config,
+                quiet=args.quiet,
                 args=args.rest[1:],
             )
         elif args.command == 'install':

tests/commands/hook_impl_test.py

@@ -136,14 +136,16 @@ def test_check_args_length_prepare_commit_msg_error():
 
 
 def test_run_ns_pre_commit():
-    ns = hook_impl._run_ns('pre-commit', True, (), b'')
+    ns = hook_impl._run_ns('pre-commit', True, False, (), b'')
     assert ns is not None
     assert ns.hook_stage == 'commit'
     assert ns.color is True
 
 
 def test_run_ns_commit_msg():
-    ns = hook_impl._run_ns('commit-msg', False, ('.git/COMMIT_MSG',), b'')
+    ns = hook_impl._run_ns(
+        'commit-msg', False, False, ('.git/COMMIT_MSG',), b'',
+    )
     assert ns is not None
     assert ns.hook_stage == 'commit-msg'
     assert ns.color is False
@@ -151,14 +153,14 @@ def test_run_ns_commit_msg():
 
 
 def test_run_ns_post_commit():
-    ns = hook_impl._run_ns('post-commit', True, (), b'')
+    ns = hook_impl._run_ns('post-commit', True, False, (), b'')
     assert ns is not None
     assert ns.hook_stage == 'post-commit'
     assert ns.color is True
 
 
 def test_run_ns_post_checkout():
-    ns = hook_impl._run_ns('post-checkout', True, ('a', 'b', 'c'), b'')
+    ns = hook_impl._run_ns('post-checkout', True, False, ('a', 'b', 'c'), b'')
     assert ns is not None
     assert ns.hook_stage == 'post-checkout'
     assert ns.color is True
@@ -186,7 +188,7 @@ def test_run_ns_pre_push_updating_branch(push_example):
     with cwd(clone):
         args = ('origin', src)
         stdin = f'HEAD {clone_head} refs/heads/b {src_head}\n'.encode()
-        ns = hook_impl._run_ns('pre-push', False, args, stdin)
+        ns = hook_impl._run_ns('pre-push', False, False, args, stdin)
 
     assert ns is not None
     assert ns.hook_stage == 'push'
@@ -204,7 +206,7 @@ def test_run_ns_pre_push_new_branch(push_example):
     with cwd(clone):
         args = ('origin', src)
         stdin = f'HEAD {clone_head} refs/heads/b {hook_impl.Z40}\n'.encode()
-        ns = hook_impl._run_ns('pre-push', False, args, stdin)
+        ns = hook_impl._run_ns('pre-push', False, False, args, stdin)
 
     assert ns is not None
     assert ns.from_ref == src_head
@@ -217,7 +219,7 @@ def test_run_ns_pre_push_new_branch_existing_rev(push_example):
     with cwd(clone):
         args = ('origin', src)
         stdin = f'HEAD {src_head} refs/heads/b2 {hook_impl.Z40}\n'.encode()
-        ns = hook_impl._run_ns('pre-push', False, args, stdin)
+        ns = hook_impl._run_ns('pre-push', False, False, args, stdin)
 
     assert ns is None
 
@@ -232,7 +234,7 @@ def test_pushing_orphan_branch(push_example):
     with cwd(clone):
         args = ('origin', src)
         stdin = f'HEAD {clone_rev} refs/heads/b2 {hook_impl.Z40}\n'.encode()
-        ns = hook_impl._run_ns('pre-push', False, args, stdin)
+        ns = hook_impl._run_ns('pre-push', False, False, args, stdin)
 
     assert ns is not None
     assert ns.all_files is True
@@ -244,7 +246,7 @@ def test_run_ns_pre_push_deleting_branch(push_example):
     with cwd(clone):
         args = ('origin', src)
         stdin = f'(delete) {hook_impl.Z40} refs/heads/b {src_head}'.encode()
-        ns = hook_impl._run_ns('pre-push', False, args, stdin)
+        ns = hook_impl._run_ns('pre-push', False, False, args, stdin)
 
     assert ns is None
 
@@ -262,6 +264,7 @@ def test_hook_impl_main_noop_pre_push(cap_out, store, push_example):
                 color=False,
                 hook_type='pre-push',
                 hook_dir='.git/hooks',
+                quiet=False,
                 skip_on_missing_config=False,
                 args=('origin', src),
             )
@@ -278,6 +281,7 @@ def test_hook_impl_main_runs_hooks(cap_out, tempdir_factory, store):
             color=False,
             hook_type='pre-commit',
             hook_dir='.git/hooks',
+            quiet=False,
             skip_on_missing_config=False,
             args=(),
         )