resynch-and-pretty-chat.rb

#!/usr/bin/env ruby -wU

require 'time'
require 'json'

# example of usage:
# ./resynch-and-convert-chat-srt.rb films017 sorting-synching/etherpad.log a.GXaGD5oiTgPmEMN5 35000 > VIDEOS_PROCESSING/20130528-1022-G17-EXP2-USER3-screencast.webm.srt

def format_timestamp(timestamp, delay=0)
  if timestamp.nil?
    return ""
  else
    ts = timestamp + delay
    return Time.at(ts / 1000, ts % 1000 * 1000).strftime("%H:%M:%S,%L")
  end
end

# def computeTimeDelays(etherpad_log_file, padid)
#   uids = {}
#   File.open(etherpad_log_file, "r") do |logFile|
#     while (line = logFile.gets())
#       if /"padid":"#{padid}"/.match(line) && /"type":"USER_CHANGES"/.match(line)      
#         m = /\[32m\[(.*)\] \[INFO.*"userId":("[a-zA-Z0-9.]*").*"timestamp":([0-9]*)/.match(line)
#         if ! m.nil?
#           uid = m[2][1..-2] # to strip \" characters
#           
#           if ! uids[uid]            
#             serverTime = Time.strptime(m[1], '%Y-%m-%d %H:%M:%S.%L')
#             clientTimestamp = m[3].to_i
#             clientTime = Time.at(clientTimestamp / 1000, clientTimestamp % 1000 * 1000)
#             deltaToAddToClient = serverTime - clientTime
#             uids[uid] = [ serverTime, clientTime, deltaToAddToClient ]
#             #uids[uid] = deltaToAddToClient
#           end    
#         end
#       end
#     end  
#   end
#   return uids
# end

if ARGV.size < 2
  puts "usage: resynch-and-convert-chat-srt num pad_id delay_in_ms"
  Process.exit(0)
else
  num = ARGV[0]
  padid = ARGV[1]
  delay = ARGV[2].to_i
end

chat_file = "DATA-by-num/#{num}/#{padid}-chat.json"

messages = []
File.open(chat_file, "r") do |inFile|
  while (line = inFile.gets())
    o = JSON.parse(line)

    o["data"].each do |msg|
      messages << msg
    end

  end
end


first_message_time = messages[0]['time'].to_i # 1369729338902

# because chat message are already timestamped with server time !!!!
#
# delays = computeTimeDelays(etherpad_log_file, padid) # compute delay to apply to client time to get server time
# delay_to_apply_in_ms = delays[userid][2] * 1000.0
# if ! delay.nil?
#   delay_to_apply_in_ms = delay_to_apply_in_ms + delay.to_i
# end

#delay_to_apply_in_ms = delay - (first_message_time + 3600000)
#delay_to_apply_in_ms = (first_message_time - delay)
delay_to_apply_in_ms = -delay


# This generate the same output as ./pretty-chat.js 
# (except username maybe)
messages.each do |msg| 
  userName = msg['userName']
  if userName.nil? then
    userName = 'anonymous'
  end 
  puts '[' + format_timestamp(msg['time'], delay_to_apply_in_ms) + '] ' + userName + ':> ' + msg['text'] # msg['userId']
end











# cmdline = "./convert-chat-as-srt.rb #{chat_file} #{delay_to_apply_in_ms}"
# 
# output = []
# IO.popen(cmdline).each do |line|
#   output << line.chomp
# end
# 
# puts output
# 
# 
#