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Edit: /opt/alt/ruby25/lib64/ruby/2.5.0/rdoc/markup/to_ansi.rb

# frozen_string_literal: true
##
# Outputs RDoc markup with vibrant ANSI color!

class RDoc::Markup::ToAnsi < RDoc::Markup::ToRdoc

##
  # Creates a new ToAnsi visitor that is ready to output vibrant ANSI color!

def initialize markup = nil
    super

@headings.clear
    @headings[1] = ["\e[1;32m", "\e[m"] # bold
    @headings[2] = ["\e[4;32m", "\e[m"] # underline
    @headings[3] = ["\e[32m",   "\e[m"] # just green
  end

##
  # Maps attributes to ANSI sequences

def init_tags
    add_tag :BOLD, "\e[1m", "\e[m"
    add_tag :TT,   "\e[7m", "\e[m"
    add_tag :EM,   "\e[4m", "\e[m"
  end

##
  # Overrides indent width to ensure output lines up correctly.

def accept_list_item_end list_item
    width = case @list_type.last
            when :BULLET then
              2
            when :NOTE, :LABEL then
              if @prefix then
                @res << @prefix.strip
                @prefix = nil
              end

@res << "\n" unless res.length == 1
              2
            else
              bullet = @list_index.last.to_s
              @list_index[-1] = @list_index.last.succ
              bullet.length + 2
            end

@indent -= width
  end

##
  # Adds coloring to note and label list items

def accept_list_item_start list_item
    bullet = case @list_type.last
             when :BULLET then
               '*'
             when :NOTE, :LABEL then
               labels = Array(list_item.label).map do |label|
                 attributes(label).strip
               end.join "\n"

labels << ":\n" unless labels.empty?

labels
             else
               @list_index.last.to_s + '.'
             end

case @list_type.last
    when :NOTE, :LABEL then
      @indent += 2
      @prefix = bullet + (' ' * @indent)
    else
      @prefix = (' ' * @indent) + bullet.ljust(bullet.length + 1)

width = bullet.gsub(/\e\[[\d;]*m/, '').length + 1

@indent += width
    end
  end

##
  # Starts accepting with a reset screen

def start_accepting
    super

@res = ["\e[0m"]
  end

end

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