_plugins/singledollar.rb


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# frozen_string_literal: true
# https://gist.github.com/sp301415/db9f7bee03bda483aa2ca7c0ca92fbfa

require 'kramdown/parser/kramdown'
require 'kramdown-parser-gfm'

class Kramdown::Parser::GFMKatex < Kramdown::Parser::GFM
  # Override inline math parser
  @@parsers.delete(:inline_math)

  INLINE_MATH_START = /(\$+)([^\$]+)(\$+)/m

  def parse_inline_math
    start_line_number = @src.current_line_number
    @src.pos += @src.matched_size
    @tree.children << Element.new(:math, @src.matched[1..-2], nil, category: :span, location: start_line_number)
  end

  define_parser(:inline_math, INLINE_MATH_START, '\$')
end