# frozen_string_literal: true

module Overcommit::Hook::CommitMsg

# Ensures the number of columns the subject and commit message lines occupy is

# under the preferred limits.

class TextWidth < Base

# A line consisting only of a URL (optionally as a Markdown-style link

# reference such as `[1]: https://...`) cannot be wrapped without breaking

# the link, so it is exempt from the body width limit.

URL_ONLY_LINE = %r{\A(\[[^\]]+\]:\s*)?[a-z][a-z0-9+.-]*://\S+\z}i.freeze

def run

return :pass if empty_message?

@errors = []

find_errors_in_subject(commit_message_lines.first.chomp)

find_errors_in_body(commit_message_lines)

return :warn, @errors.join("\n") if @errors.any?

:pass

end

private

def find_errors_in_subject(subject)

max_subject_width =

config['max_subject_width'] +

special_prefix_length(subject)

if subject.length > max_subject_width

@errors << "Commit message subject must be <= #{max_subject_width} characters"

return

end

min_subject_width = config['min_subject_width']

if subject.length < min_subject_width

@errors << "Commit message subject must be >= #{min_subject_width} characters"

nil

end

end

def find_errors_in_body(lines)

return unless lines.count > 2

max_body_width = config['max_body_width']

lines[2..].each_with_index do |line, index|

next if line.chomp.size <= max_body_width || url_only_line?(line)

@errors << "Line #{index + 3} of commit message has > " \

"#{max_body_width} characters"

end

end

def url_only_line?(line)

URL_ONLY_LINE.match?(line.strip)

end

def special_prefix_length(subject)

subject.match(/^(fixup|squash)! /) { |match| match[0].length } || 0

end

end

end