earthquake.gem plugin to show english tweets only

english.rb

# Configuration
# -------------
#
#     Earthquake.config[:english] = {
#       ignore: /jugyo|yukihiro_matz/,
#       highlight: /ruby|rails|sublime|git|twitter/i
#     }
#
Earthquake.init do
  _ = config[:english] ||= {}

  output_filter do |item|
    next if _[:disable]
    next unless item["text"] && item["_stream"]

    if /[一-龠]+|[ぁ-ん]+|[ァ-ヴー]+|[ａ-ｚＡ-Ｚ０-９]+/ !~ item["text"] ||
       (_[:ignore] && (_[:ignore] =~ item["user"]["screen_name"] || _[:ignore] =~ item["text"]))

      if _[:highlight]
        words = item["text"].scan(_[:highlight])
        unless words.empty?
          item["_highlights"] ||= []
          item["_highlights"] += words
        end
      end

      true
    else
      false
    end
  end
end