fix: skip the header length check and configure header length

src/commitlint/cli.py

@@ -59,7 +59,6 @@ def get_args() -> argparse.Namespace:
     group.add_argument("--from-hash", type=str, help="From commit hash")
     # --to-hash is optional
     parser.add_argument("--to-hash", type=str, help="To commit hash", default="HEAD")
-
     # feature options
     parser.add_argument(
         "--skip-detail",
@@ -85,6 +84,14 @@ def get_args() -> argparse.Namespace:
         default=False,
     )
 
+    output_group.add_argument(
+        "--max-header-length", help="commit message header max length"
+    )
+    output_group.add_argument(
+        "--disable-header-length-check",
+        action="store_true",
+        help="disable header max length check",
+    )
     # --verbose option is optional
     output_group.add_argument(
         "-v",
@@ -152,10 +159,13 @@ def _get_commit_message_from_file(filepath: str) -> str:
         return commit_message
 
 
+# pylint: disable=too-many-arguments
 def _handle_commit_message(
     commit_message: str,
     skip_detail: bool,
     hide_input: bool,
+    max_header_length: int,
+    disable_max_header_length_check: bool = False,
     strip_comments: bool = False,
 ) -> None:
     """
@@ -171,7 +181,13 @@ def _handle_commit_message(
     Raises:
         SystemExit: If the commit message is invalid.
     """
-    success, errors = lint_commit_message(commit_message, skip_detail, strip_comments)
+    success, errors = lint_commit_message(
+        commit_message=commit_message,
+        skip_detail=skip_detail,
+        strip_comments=strip_comments,
+        max_header_length=max_header_length,
+        disable_max_header_length=disable_max_header_length_check,
+    )
 
     if success:
         console.success(VALIDATION_SUCCESSFUL)
@@ -182,7 +198,11 @@ def _handle_commit_message(
 
 
 def _handle_multiple_commit_messages(
-    commit_messages: List[str], skip_detail: bool, hide_input: bool
+    commit_messages: List[str],
+    skip_detail: bool,
+    hide_input: bool,
+    disable_max_header_length_check: bool,
+    max_header_length: int,
 ) -> None:
     """
     Handles multiple commit messages, checks their validity, and prints the result.
@@ -198,7 +218,12 @@ def _handle_multiple_commit_messages(
     has_error = False
 
     for commit_message in commit_messages:
-        success, errors = lint_commit_message(commit_message, skip_detail)
+        success, errors = lint_commit_message(
+            commit_message,
+            max_header_length=max_header_length,
+            skip_detail=skip_detail,
+            disable_max_header_length=disable_max_header_length_check,
+        )
         if success:
             console.verbose("lint success")
             continue
@@ -224,6 +249,14 @@ def main() -> None:
     config.verbose = args.verbose
 
     console.verbose("starting commitlint")
+
+    if args.max_header_length and args.disable_header_length_check:
+        console.error(
+            "--max-header-length and "
+            "--disable-header-length-check can't be passed together"
+        )
+        raise CommitlintException
+
     try:
         if args.file:
             console.verbose("commit message source: file")
@@ -232,13 +265,19 @@ def main() -> None:
                 commit_message,
                 skip_detail=args.skip_detail,
                 hide_input=args.hide_input,
+                disable_max_header_length_check=args.disable_header_length_check,
+                max_header_length=args.max_header_length,
                 strip_comments=True,
             )
         elif args.hash:
             console.verbose("commit message source: hash")
             commit_message = get_commit_message_of_hash(args.hash)
             _handle_commit_message(
-                commit_message, skip_detail=args.skip_detail, hide_input=args.hide_input
+                commit_message,
+                skip_detail=args.skip_detail,
+                hide_input=args.hide_input,
+                max_header_length=args.max_header_length,
+                disable_max_header_length_check=args.disable_header_length_check,
             )
         elif args.from_hash:
             console.verbose("commit message source: hash range")
@@ -249,12 +288,18 @@ def main() -> None:
                 commit_messages,
                 skip_detail=args.skip_detail,
                 hide_input=args.hide_input,
+                max_header_length=args.max_header_length,
+                disable_max_header_length_check=args.disable_header_length_check,
             )
         else:
             console.verbose("commit message source: direct message")
             commit_message = args.commit_message.strip()
             _handle_commit_message(
-                commit_message, skip_detail=args.skip_detail, hide_input=args.hide_input
+                commit_message,
+                skip_detail=args.skip_detail,
+                hide_input=args.hide_input,
+                max_header_length=args.max_header_length,
+                disable_max_header_length_check=args.disable_header_length_check,
             )
     except CommitlintException as ex:
         console.error(f"{ex}")

src/commitlint/linter/_linter.py

@@ -8,6 +8,7 @@
 from .. import console
 from .utils import is_ignored, remove_comments
 from .validators import (
+    CommitValidator,
     HeaderLengthValidator,
     PatternValidator,
     SimplePatternValidator,
@@ -16,12 +17,18 @@
 
 
 def lint_commit_message(
-    commit_message: str, skip_detail: bool = False, strip_comments: bool = False
+    commit_message: str,
+    max_header_length: int,
+    skip_detail: bool = False,
+    disable_max_header_length: bool = False,
+    strip_comments: bool = False,
 ) -> Tuple[bool, List[str]]:
     """
     Lints a commit message.
 
     Args:
+        disable_max_header_length: flag to disable the max header length check
+        max_header_length: maximum length of commit message header
         commit_message (str): The commit message to be linted.
         skip_detail (bool, optional): Whether to skip the detailed error linting
             (default is False).
@@ -47,16 +54,30 @@ def lint_commit_message(
         console.verbose("commit message ignored, skipping lint")
         return True, []
 
+    validator_instances: list[CommitValidator] = []
+
+    if not disable_max_header_length:
+        validator_instances.append(
+            HeaderLengthValidator(
+                commit_message=commit_message,
+                **{"max_header_length": max_header_length},  # type: ignore
+            )
+        )
+
     # for skip_detail check
     if skip_detail:
         console.verbose("running simple validators for linting")
+
+        validator_instances.append(
+            SimplePatternValidator(commit_message=commit_message)
+        )
+
         return run_validators(
-            commit_message,
-            validator_classes=[HeaderLengthValidator, SimplePatternValidator],
+            validator_classes=validator_instances,
             fail_fast=True,
         )
 
+    validator_instances.append(PatternValidator(commit_message=commit_message))
+
     console.verbose("running detailed validators for linting")
-    return run_validators(
-        commit_message, validator_classes=[HeaderLengthValidator, PatternValidator]
-    )
+    return run_validators(validator_classes=validator_instances)

src/commitlint/linter/validators.py

@@ -6,7 +6,7 @@
 
 import re
 from abc import ABC, abstractmethod
-from typing import List, Tuple, Type, Union
+from typing import Any, List, Tuple, Union, cast
 
 from .. import console
 from ..constants import COMMIT_HEADER_MAX_LENGTH, COMMIT_TYPES
@@ -30,15 +30,15 @@
 class CommitValidator(ABC):
     """Abstract Base validator for commit message."""
 
-    def __init__(self, commit_message: str) -> None:
+    def __init__(self, commit_message: str, **kwargs: dict[str, Any]) -> None:
         self._commit_message = commit_message
         self._errors: List[str] = []
 
         # start validation
-        self.validate()
+        self.validate(**kwargs)
 
     @abstractmethod
-    def validate(self) -> None:
+    def validate(self, **kwargs: dict[str, Any]) -> None:
         """Performs the validation."""
         raise NotImplementedError  # pragma: no cover
 
@@ -50,6 +50,7 @@ def is_valid(self) -> bool:
         """Checks if there are any errors."""
         return len(self._errors) == 0
 
+    @property
     def errors(self) -> List[str]:
         """Get the list of errors."""
         return self._errors
@@ -63,15 +64,23 @@ def commit_message(self) -> str:
 class HeaderLengthValidator(CommitValidator):
     """Validator for checking commit header length."""
 
-    def validate(self) -> None:
+    def validate(self, **kwargs: dict[str, Any]) -> None:
         """
         Validates the length of the commit header.
 
         Returns:
             None
         """
+        max_header_length = kwargs.get("max_header_length")
+
+        if max_header_length:
+            header_length = cast(int, max_header_length)
+        else:
+            header_length = COMMIT_HEADER_MAX_LENGTH
+
         header = self.commit_message.split("\n")[0]
-        if len(header) > COMMIT_HEADER_MAX_LENGTH:
+
+        if len(header) > int(header_length):
             self.add_error(HEADER_LENGTH_ERROR)
 
 
@@ -90,7 +99,7 @@ class SimplePatternValidator(CommitValidator):
         r"((\n\n(?P<body>.*))|(\s*))?$"
     )
 
-    def validate(self) -> None:
+    def validate(self, **kwargs: dict[str, Any]) -> None:
         """
         Validates the commit message using the regex pattern.
 
@@ -118,7 +127,7 @@ class PatternValidator(CommitValidator):
         r"(((?P<body>.*))|(\s*))?$"
     )
 
-    def validate(self) -> None:
+    def validate(self, **kwargs: dict[str, Any]) -> None:
         """
         Validates the commit message using the regex pattern.
 
@@ -286,8 +295,7 @@ def validate_description_no_full_stop_at_end(
 
 
 def run_validators(
-    commit_message: str,
-    validator_classes: List[Type[CommitValidator]],
+    validator_classes: List[CommitValidator],
     fail_fast: bool = False,
 ) -> Tuple[bool, List[str]]:
     """Runs the provided validators for the commit message.
@@ -307,17 +315,18 @@ def run_validators(
     success = True
     errors: List[str] = []
 
-    for validator_class in validator_classes:
-        console.verbose(f"running validator {validator_class.__name__}")
-        validator = validator_class(commit_message)
-        if not validator.is_valid():
-            console.verbose(f"{validator_class.__name__}: validation failed")
+    for validator_instance in validator_classes:
+        console.verbose(f"running validator {validator_instance.__class__.__name__}")
+        if not validator_instance.is_valid():
+            console.verbose(
+                f"{validator_instance.__class__.__name__}: validation failed"
+            )
             if fail_fast:
                 console.verbose(f"fail_fast: {fail_fast}, skipping further validations")
                 # returning immediately if any error occurs.
-                return False, validator.errors()
+                return False, validator_instance.errors
 
             success = False
-            errors.extend(validator.errors())
+            errors.extend(validator_instance.errors)
 
     return success, errors

tests/test_cli.py

@@ -459,3 +459,46 @@ def test__invalid_commit_message_with_hash_range_in_quiet(
 
         mock_stderr_write.assert_not_called()
         mock_stdout_write.assert_not_called()
+
+
+class TestCliHeaderLength:
+    @patch(
+        "commitlint.cli.get_args",
+        return_value=ArgsMock(
+            commit_message="feat: add method 'formatEnglishDate' \
+                           and 'formatEnglishDateInNepali' (#165)",
+            quiet=True,
+            max_header_length=20,
+        ),
+    )
+    @patch("sys.stdout.write")
+    @patch("sys.stderr.write")
+    def test__main__quiet_option_with_header_max_length(
+        self, mock_stderr_write, mock_stdout_write, *_
+    ):
+        with pytest.raises(SystemExit):
+            main()
+
+        mock_stderr_write.assert_not_called()
+        mock_stdout_write.assert_not_called()
+
+    @patch(
+        "commitlint.cli.get_args",
+        return_value=ArgsMock(
+            commit_message="feat: add method 'formatEnglishDate' \
+                               and 'formatEnglishDateInNepali' (#165)",
+            quiet=True,
+            max_header_length=20,
+            disable_header_length_check=True,
+        ),
+    )
+    @patch("sys.stdout.write")
+    @patch("sys.stderr.write")
+    def test__with_both_header_max_length_and_disabled_max_header_length_check(
+        self, mock_stderr_write, mock_stdout_write, *_
+    ):
+        with pytest.raises(CommitlintException):
+            main()
+
+        mock_stderr_write.assert_not_called()
+        mock_stdout_write.assert_not_called()