symlist.rb

require 'open-uri'
require 'cgi'
require 'restclient'
require 'rmagick'

MATHTRAN = "http://www.mathtran.org/cgi-bin/mathtran"

def get tex
  RestClient.get("#{MATHTRAN}?tex=#{CGI::escape(tex)}")
end

open 'http://www.ctan.org/get/info/symbols/comprehensive/SYMLIST' do |list|
  symbols = list.readlines.map(&:strip)
  works, out = symbols.partition do |symbol|
    puts "checking #{symbol}"
    png = Magick::Image.from_blob(get(symbol)).first
    (png.columns != 1) || (png.rows != 1)
  end
  
  puts "*** Working symbols"
  p works
  
  puts "*** Not working"
  p out
end