Add fail_fast support per-hook

pre_commit/clientlib.py

@@ -70,6 +70,7 @@ MANIFEST_HOOK_DICT = cfgv.Map(
     ),
     cfgv.Optional('args', cfgv.check_array(cfgv.check_string), []),
     cfgv.Optional('always_run', cfgv.check_bool, False),
+    cfgv.Optional('fail_fast', cfgv.check_bool, False),
     cfgv.Optional('pass_filenames', cfgv.check_bool, True),
     cfgv.Optional('description', cfgv.check_string, ''),
     cfgv.Optional('language_version', cfgv.check_string, C.DEFAULT),

pre_commit/commands/run.py

@@ -290,7 +290,7 @@ def _run_hooks(
             verbose=args.verbose, use_color=args.color,
         )
         retval |= current_retval
-        if retval and config['fail_fast']:
+        if retval and (config['fail_fast'] or hook.fail_fast):
             break
     if retval and args.show_diff_on_failure and prior_diff:
         if args.all_files:

pre_commit/hook.py

@@ -27,6 +27,7 @@ class Hook(NamedTuple):
     additional_dependencies: Sequence[str]
     args: Sequence[str]
     always_run: bool
+    fail_fast: bool
     pass_filenames: bool
     description: str
     language_version: str