Scrape Slack html for a team's emojis, download them and rename them so you can use elsewhere

scrape

#!/usr/bin/env ruby
# Go to emoji customization page on your Slack org
# download the html for that page
# Also need "nokogiri" installed
#
# Usage: scrape <htmlfile>
require 'nokogiri'
require 'open-uri'

file = ARGV[0]
doc = Nokogiri::XML(File.open(file))

`mkdir -p download`

doc.xpath("//tr[contains(@class, 'emoji_row')]").each do |tr|
  emoji_span = tr.xpath(".//span[contains(@class, 'emoji-wrapper')]").first
  name = tr.xpath(".//td[contains(@headers, 'custom_emoji_name')]").first.content.strip.gsub(":", "")
  if emoji_span && name
    url = emoji_span["data-original"]
    ext = url.split(".").last
    puts "Downloading: #{name} from #{url}"

    open("download/#{name}.#{ext}", 'wb') do |f|
      f << open(url).read
    end
  end
end