emoji_statistics.rb

# This script is released under the public domain.

# What's this?
#   This script counts how many times emoji are used on your slack.
#   It requires exported slack data.

# How to use it:
#   $ ruby emoji_statistics.rb /path/to/exported/dir

require 'json'

path = ARGV[0]

if !Dir.exist?(path)
  puts path
  STDERR.puts "Error: invalid argument"
  exit(1)
end

class Statistics
  def initialize()
    @stat = {}
  end

  def add(emoji, num = 1)
    @stat[emoji] ||= 0
    @stat[emoji] += num
  end

  def sort()
    @stat.sort {|(_, x), (_, y)| x <=> y}
  end
end

@msg = Statistics.new
@reaction = Statistics.new
@total = Statistics.new

EMOJI_REGEX = /:[^:\s\.\/A-Z]+:/

Dir.glob(File.join(path, "**/*.json")).each do |file|
  str = File.read(file)
  obj = JSON.parse(str)
  obj.each do |msg|
    msg["text"]&.scan(EMOJI_REGEX)&.each do |emoji|
      @msg.add(emoji)
      @total.add(emoji)
    end

    msg["reactions"]&.each do |r|
      emoji = ":#{r["name"]}:"
      @reaction.add(emoji, r["count"])
      @total.add(emoji, r["count"])
    end
  end
end

puts "in msg"
puts @msg.sort.reverse[0..19]
puts "--------------------"
puts "in reaction "
puts @reaction.sort.reverse[0..19]
puts "--------------------"
puts "in total "
puts @total.sort.reverse[0..19]