Fetch all of your gchat messages and threads and stuff them into couchdb.

get_gchats.js

function sendAllGChatThreadsToURL(url) {
  var total = 0
    , offset = 500 // the max
  
  Logger.log('starting...')
  
  for (var start = 0; ; start += offset) {
    var threads = GmailApp.getChatThreads(start, offset)
    
    if (threads.length === 0) {
      Logger.log('no more threads left')
      break
    }
  
    for (var i = 0; i < threads.length; i++) {
      // if/when you run out of execution time, use the last logged value + 1
      // as the next `start` for the script.
      Logger.log('thread: ' + (start + i))
      
      var thread = threads[i]
        , messages = thread.getMessages()
         
      var payload = [];
      
      for (var j = messages.length - 1; j >= 0 ; j--) {
        var message = messages[j]
        
        if (!message) {
          continue
        }
        
        payload.push({
            id: message.getId()
          , thread: thread.getId()
          , from: message.getFrom()
          , to: message.getTo()
          , body: Utilities.base64Encode(message.getBody())
          , date: message.getDate()
        })
         
        total += 1
      }
      
      var params = {
          method: "post"
        , payload: {
            messages: Utilities.jsonStringify(payload)
          }
      }
      
      UrlFetchApp.fetch(url, params)
    }
  }
  
  Logger.log('sent ' + total + ' messages')
}

function main() {
  var url = "http://XXXX.localtunnel.com/gchat"
  sendAllGChatThreadsToURL(url)
}

server.rb

require 'json/ext'
require 'couchrest'
require 'cgi'
require 'base64'
require 'pp'
require 'sinatra'

db = CouchRest.database!('http://localhost:5984/gchat')

post '/gchat' do
  return if params.empty? or params['messages'].nil?

  messages = JSON.parse(params['messages'])

  messages.each do |message|
    message['body'] = CGI.unescapeHTML(Base64.decode64(message['body']))

    message['date'] = Time.parse(message['date'])
    message['day'] = message['date'].day
    message['month'] = message['date'].month
    message['year'] = message['date'].year
    message['from'] = message['from'].split('<').first.strip
    message['to'] = message['to'].split('<').first.strip

    db.save_doc message
  end

  return :ok
end

sms_to_couch.rb

# for converting xml backups from SMS Backup and Restore Android app into
# CouchDB documents

require 'json/ext'
require 'nori'
require 'couchrest'
require 'nokogiri'
require 'pp'

@parser = Nori.new
@db = CouchRest.database!('http://localhost:5984/sms')

Dir['SMSBackups/*'].each do |file|
  f = File.open(file)
  doc = Nokogiri::XML(f).css('sms')
  f.close

  doc.each do |message|
    m = @parser.parse(message.to_s)['sms']
    m.keys.each do |k|
      m[k.gsub('@','')] = m[k]
    end

    m['address'] = m['address'].gsub /([ -])/, ''
    m['date'] = Time.at(m['date'][0..-4].to_i)
    m['date_sent'] = Time.at(m['date_sent'][0..-4].to_i)
    m['day'] = m['date'].day
    m['month'] = m['date'].month
    m['year'] = m['date'].year

    next if (@db.view 'texts/all', key: m['date'])['rows'].size > 0

    @db.save_doc m
  end
end