Show top 10 trends for the location

trends.rb

# -*- coding: utf-8 -*-
# monkey patch to support Twitter API v1.1
Earthquake.once do
  Module.new do |api_v1_1|
    def trends(woeid)
      get("/trends/place.json?id=#{woeid}")
    end

    TwitterOAuth::Client.__send__(:prepend, api_v1_1)
  end
end

Earthquake.init do
  command :trends do
    location = config[:trends_location] || "Worldwide"
    input(":trends #{location}")
  end

  command :trends do |m|
    location = m[1]
    if cached = cache.read("trend:#{location}") and cached[:expires_in].future?
      ap(candidates = cached[:names])
    else
      unless trends_available = cache.read("trends:available")
        puts "caching available trends information...".c(:info)
        trends_available = twitter.trends_available.each_with_object({}) do |info, hash|
          hash[info["name"]] = info["woeid"]
        end
        cache.write("trends:available", trends_available)
      end
      if woeid = trends_available[location]
        names = twitter.trends(woeid)[0]["trends"].map{|trend| trend["name"]}
        cache.write("trend:#{location}", names: names, expires_in: 5.minutes.from_now)
        ap(candidates = names)
      else
        names = trends_available.keys.grep(/#{Regexp.escape(location)}/i)
        print "Unknown location. ".c(:info)
        if names.empty?
          puts "Nothing matched.".c(:info)
        else
          puts "Did you mean:".c(:info)
          ap names
        end
      end
    end
    if candidates
      index = ((Integer(ask("search trend? (just ENTER to leave) [0-9]: ")) % 10) rescue next)
      command = ":search #{candidates[index]}"
      Readline::HISTORY << command
      input(command)
    end
  end

  help :trends, "show top 10 trends for the location", <<-'HELP'
    # switch to search if unknown location (case-insensitive)
    ⚡ :trends ja
    Unknown location. Did you mean:
    [
        [0] "Japan",
        [1] "Jakarta",
        [2] "Jackson",
        [3] "Rio de Janeiro"
    ]
    # show (and search) trends if known place (case-sensitive)
    ⚡ :trends Japan
    [
        [0] "#earthquakegem",
        [1] "Ruby",
    (snip)
        [9] "awesome"
    ]
    search trend? (just ENTER to leave) [0-9]: 0
    (invoke ':search #earthquakegem')
    # in short, set config[:trends_location] to your favorite
    ⚡ :trends
    (show top 10 trends of specified location or "Worldwide" as a default)
  HELP
end