Helper for displaying an image using filestack.com and their conversion options

filestack.rb

# Usage:
# <%= filestack_image_tag post.filestack_url, resize: { width: 100, height: 200, fit: crop }, oil_paint: { amount: 7 } %>
#
# => https://process.filestackapi.com/[FILESTACK API KEY]/resize=width:72,height:72,fit:crop/oil_paint=amount:7/https://cdn.filestackcontent.com/abc23...

def filestack_image_tag(url, task_options={}, image_tag_options={})
  base_path = "https://process.filestackapi.com/#{Rails.application.config.filestack_api_key}"
  task_path = task_options.collect do |task, options|
    "#{task.to_s}=#{options.collect{|k,v| "#{k}:#{v}"}.join(',')}"
  end.join('/')
  image_url = [base_path, task_path, url].join('/')
  view_context.image_tag image_url, image_tag_options
end
helper_method :filestack_image_tag