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custom-nix/blog/convert.rb

34 lines
856 B
Ruby

require "open3"
require "nokogiri"
def perform_katex_sub(content)
rendered = content.gsub /\\\(((?:[^\\]|\\[^\)])*)\\\)/ do |match|
puts " Rendering #{$~[1]}"
Open3.popen3("$(npm bin)/katex") do |i, o, e, t|
i.write $~[1]
i.close
o.read.force_encoding(Encoding::UTF_8).strip
end
end
rendered = rendered.gsub /\$\$((?:[^\$]|$[^\$])*)\$\$/ do |match|
puts " Rendering display."
Open3.popen3("$(npm bin)/katex -d") do |i, o, e, t|
i.write $~[1]
i.close
o.read.force_encoding(Encoding::UTF_8).strip
end
end
return rendered
end
files = ARGV[0..-1]
files.each do |file|
puts "Rendering file: #{file}"
document = Nokogiri::HTML.parse(File.open(file))
document.search('//text()').each do |t|
t.replace(perform_katex_sub(t.content))
end
File.write(file, document.to_html)
end