Create list of three letter acronyms used in a Slack team with example usage

slack_tla_dictionary.rb

require 'zip'
require 'json'

infile = ARGV[0]

tlas = {}

Zip::File.open(infile) do |zip_file|
  entries = zip_file.glob('*/*.json')

  entries.each do |entry|
    messages = JSON.parse(entry.get_input_stream.read)
    messages.each do |msg|
      matches = msg["text"].match(/\s([A-Z]{3,3})\s/)
      unless matches.nil?
        tlas[matches[1]] = msg["text"].gsub("\n"," ").gsub("\t"," ")
      end
    end
 end
end
tlas = Hash[tlas.sort_by{|k,v| k}]
tlas.each do |tla,val|
  puts "#{tla}\t#{val}"
end