How to use the gitlint.rules.LineRule function in gitlint

if lower > upper:
            # Should not happen
            raise Exception("Cannot find imperative mood of {}".format(key))

        mid = (lower + upper) // 2
        imperative_form = words[mid]

        if key[:3] == imperative_form[:3]:
            return imperative_form
        elif key < imperative_form:
            upper = mid - 1
        elif key > imperative_form:
            lower = mid + 1


class ImperativeMood(LineRule):
    """ This rule will enforce that the commit message title uses imperative
    mood. This is done by checking if the first word is in `WORD_SET`, if so
    show the word in the correct mood. """

    name = "title-imperative-mood"
    id = "Z1"
    target = CommitMessageTitle

    error_msg = ('The first word in commit title should be in imperative mood '
                 '("{word}" -> "{imperative}"): "{title}"')

    def validate(self, line, commit):
        # type: (Text, gitlint.commit) -> List[RuleViolation]
        violations = []

        # Ignore the section tag (ie `<section>: .`)</section>

import re

from gitlint.options import ListOption
from gitlint.rules import CommitMessageTitle, LineRule, RuleViolation
from gitlint.utils import ustr

RULE_REGEX = re.compile(r"[^(]+?(\([^)]+?\))?: .+")


class ConventionalCommit(LineRule):
    """ This rule enforces the spec at https://www.conventionalcommits.org/. """

    name = "contrib-title-conventional-commits"
    id = "CT1"
    target = CommitMessageTitle

    options_spec = [
        ListOption(
            "types",
            ["fix", "feat", "chore", "docs", "style", "refactor", "perf", "test", "revert", "ci", "build"],
            "Comma separated list of allowed commit types.",
        )
    ]

    def validate(self, line, _commit):
        violations = []

return sstr(self)  # pragma: no cover

    def __unicode__(self):
        return u"{0}: {1} {2}: \"{3}\"".format(self.line_nr, self.rule_id, self.message,
                                               self.content)  # pragma: no cover

    def __repr__(self):
        return self.__str__()  # pragma: no cover


class UserRuleError(Exception):
    """ Error used to indicate that an error occurred while trying to load a user rule """
    pass


class MaxLineLength(LineRule):
    name = "max-line-length"
    id = "R1"
    options_spec = [IntOption('line-length', 80, "Max line length")]
    violation_message = "Line exceeds max length ({0}>{1})"

    def validate(self, line, _commit):
        max_length = self.options['line-length'].value
        if len(line) > max_length:
            return [RuleViolation(self.id, self.violation_message.format(len(line), max_length), line)]


class TrailingWhiteSpace(LineRule):
    name = "trailing-whitespace"
    id = "R2"
    violation_message = "Line has trailing whitespace"

class TitleMaxLength(MaxLineLength):
    name = "title-max-length"
    id = "T1"
    target = CommitMessageTitle
    options_spec = [IntOption('line-length', 72, "Max line length")]
    violation_message = "Title exceeds max length ({0}>{1})"


class TitleTrailingWhitespace(TrailingWhiteSpace):
    name = "title-trailing-whitespace"
    id = "T2"
    target = CommitMessageTitle
    violation_message = "Title has trailing whitespace"


class TitleTrailingPunctuation(LineRule):
    name = "title-trailing-punctuation"
    id = "T3"
    target = CommitMessageTitle

    def validate(self, title, _commit):
        punctuation_marks = '?:!.,;'
        for punctuation_mark in punctuation_marks:
            if title.endswith(punctuation_mark):
                return [RuleViolation(self.id, u"Title has trailing punctuation ({0})".format(punctuation_mark), title)]


class TitleHardTab(HardTab):
    name = "title-hard-tab"
    id = "T4"
    target = CommitMessageTitle
    violation_message = "Title contains hard tab characters (\\t)"

def title_line_rules(self):
        return [rule for rule in self.config.rules if
                isinstance(rule, gitlint_rules.LineRule) and
                rule.target == gitlint_rules.CommitMessageTitle and not self.should_ignore_rule(rule)]

# A rule MUST have an *unique* id, we recommend starting with UC (for User-defined Commit-rule).
    id = "UC2"

    def validate(self, commit):
        flags = re.UNICODE
        flags |= re.IGNORECASE
        for line in commit.message.body:
            if line.lower().startswith("signed-off-by"):
                if not re.search(r"(^)Signed-off-by: ([-'\w.]+) ([-'\w.]+) (.*)", line, flags=flags):
                    return [RuleViolation(self.id, "Signed-off-by: must have a full name", line_nr=1)]
                else:
                    return
        return [RuleViolation(self.id, "Body does not contain a 'Signed-off-by:' line", line_nr=1)]

class TitleMaxLengthRevert(LineRule):
    name = "title-max-length-no-revert"
    id = "UC5"
    target = CommitMessageTitle
    options_spec = [IntOption('line-length', 72, "Max line length")]
    violation_message = "Title exceeds max length ({0}>{1})"

    def validate(self, line, _commit):
        max_length = self.options['line-length'].value
        if len(line) > max_length and not line.startswith("Revert"):
            return [RuleViolation(self.id, self.violation_message.format(len(line), max_length), line)]

class TitleStartsWithSubsystem(LineRule):
    name = "title-starts-with-subsystem"
    id = "UC3"
    target = CommitMessageTitle
    options_spec = [StrOption('regex', ".*", "Regex the title should match")]

first_word = words[0].lower()

        if first_word in WORD_SET:
            imperative = head_binary_search(first_word, imperative_forms)
            violation = RuleViolation(self.id, self.error_msg.format(
                word=first_word,
                imperative=imperative,
                title=commit.message.title
            ))

            violations.append(violation)

        return violations


class TitleMatchRegexAllowException(LineRule):
    """Allows revert commits contrary to the built-in title-match-regex rule"""

    name = 'title-match-regex-allow-exception'
    id = 'Z2'
    target = CommitMessageTitle
    options_spec = [StrOption('regex', ".*", "Regex the title should match")]

    def validate(self, title, commit):
        # type: (Text, gitlint.commit) -> List[RuleViolation]

        regex = self.options['regex'].value
        pattern = re.compile(regex, re.UNICODE)
        if not pattern.search(title) and not title.startswith("Revert \""):
            violation_msg = u"Title does not match regex ({0})".format(regex)
            return [RuleViolation(self.id, violation_msg, title)]

if len(line) > max_length:
            return [RuleViolation(self.id, self.violation_message.format(len(line), max_length), line)]


class TrailingWhiteSpace(LineRule):
    name = "trailing-whitespace"
    id = "R2"
    violation_message = "Line has trailing whitespace"

    def validate(self, line, _commit):
        pattern = re.compile(r"\s$", re.UNICODE)
        if pattern.search(line):
            return [RuleViolation(self.id, self.violation_message, line)]


class HardTab(LineRule):
    name = "hard-tab"
    id = "R3"
    violation_message = "Line contains hard tab characters (\\t)"

    def validate(self, line, _commit):
        if "\t" in line:
            return [RuleViolation(self.id, self.violation_message, line)]


class LineMustNotContainWord(LineRule):
    """ Violation if a line contains one of a list of words (NOTE: using a word in the list inside another word is not
    a violation, e.g: WIPING is not a violation if 'WIP' is a word that is not allowed.) """
    name = "line-must-not-contain"
    id = "R5"
    options_spec = [ListOption('words', [], "Comma separated list of words that should not be found")]
    violation_message = u"Line contains {0}"