get a list of all of duckduckgo's bangs in a programmatic manner, useful for scripting

ddg_bangs.rb

# frozen_string_literal: true

require 'cgi'
require 'json'
require 'open-uri'
require 'yaml'

UA = 'Ruby script to read the full list of bangs/2.0 ; https://gist.github.com/skull-squadron/f53c38c678045660a36a5fcd1f50196a'

module Flow
  refine BasicObject do
    def flow(*, **, &)
      block_given? ? yield(self, *, **) : self
    end
  end
end

class DDGBang < Struct.new(:category, :sub_category, :bang, :full_name, :visit_domain, :search_url_template, :rank)
  def initialize(**options)
    self.category = options.delete('c')
    self.sub_category = options.delete('sc')
    self.bang = options.delete('t')
    self.full_name = options.delete('s')
    self.visit_domain = options.delete('d')
    self.search_url_template = options.delete('u')
    self.rank = options.delete('r')
    raise ArgumentError, "Unknown options #{options.keys.inspect}" unless options.empty?
  end
  
  def to_json(*)
    values.to_json
  end
  
  def as_url(*search_string)
    return visit_domain if search_string.empty?
    
    search_url_template.sub('{{{s}}}', CGI.escape(search_string[0]))
  end
end

class DDGAllBangs
  using Flow

  def bangs
    @bangs ||= URI.open('https://duckduckgo.com/bang.js', 'User-Agent' => UA)
                  .flow { |body| JSON.load(body) } 
                  .flow { |js| js.map { |object| DDGBang.new(**object) } }
  end

  def to_json
    JSON.pretty_generate(bangs)
  end

  def to_yaml
    bangs.map(&:to_h).to_yaml
  end
end

ddg_bangs = DDGAllBangs.new
IO.write('/tmp/ddg_bangs.yaml', ddg_bangs.to_yaml)
IO.write('/tmp/ddg_bangs.json', ddg_bangs.to_json)