Add fail-fast argument for run command

pre_commit/commands/hook_impl.py

@@ -106,6 +106,7 @@ def _ns(
         hook=None,
         verbose=False,
         show_diff_on_failure=False,
+        fail_fast=False,
     )
 
 

pre_commit/commands/run.py

@@ -298,7 +298,8 @@ def _run_hooks(
             verbose=args.verbose, use_color=args.color,
         )
         retval |= current_retval
-        if current_retval and (config['fail_fast'] or hook.fail_fast):
+        fail_fast = (config['fail_fast'] or hook.fail_fast or args.fail_fast)
+        if current_retval and fail_fast:
             break
     if retval and args.show_diff_on_failure and prior_diff:
         if args.all_files:

pre_commit/main.py

@@ -76,6 +76,10 @@ def _add_run_options(parser: argparse.ArgumentParser) -> None:
         '--show-diff-on-failure', action='store_true',
         help='When hooks fail, run `git diff` directly afterward.',
     )
+    parser.add_argument(
+        '--fail-fast', action='store_true',
+        help='Stop after the first failing hook.',
+    )
     parser.add_argument(
         '--hook-stage',
         choices=clientlib.STAGES,

testing/util.py

@@ -40,6 +40,7 @@ def run_opts(
         color=False,
         verbose=False,
         hook=None,
+        fail_fast=False,
         remote_branch='',
         local_branch='',
         from_ref='',
@@ -65,6 +66,7 @@ def run_opts(
         color=color,
         verbose=verbose,
         hook=hook,
+        fail_fast=fail_fast,
         remote_branch=remote_branch,
         local_branch=local_branch,
         from_ref=from_ref,

tests/commands/run_test.py

@@ -1104,6 +1104,19 @@ def test_fail_fast_not_prev_failures(cap_out, store, repo_with_failing_hook):
     assert printed.count(b'run me!') == 1
 
 
+def test_fail_fast_run_arg(cap_out, store, repo_with_failing_hook):
+    with modify_config() as config:
+        # More than one hook to demonstrate early exit
+        config['repos'][0]['hooks'] *= 2
+    stage_a_file()
+
+    ret, printed = _do_run(
+        cap_out, store, repo_with_failing_hook, run_opts(fail_fast=True),
+    )
+    # it should have only run one hook due to the CLI flag
+    assert printed.count(b'Failing hook') == 1
+
+
 def test_classifier_removes_dne():
     classifier = Classifier(('this_file_does_not_exist',))
     assert classifier.filenames == []