Ruby script to update expo config files that need to be updated as you change networks. This script will update the urls expo is using to serve up the JS resources. This configs should be auto updated during the build process, but for some reason it sometimes does not work. Running this script will fix those urls.

replace_expo_urls.rb

#!/usr/bin/env ruby
require 'json'
require 'rexml/document'
include REXML

def fix_exshell_json(filename, url)
  json_file = JSON.parse File.read(filename)
  json_file['developmentUrl'] = url
  File.open(filename, 'w') { |file| file.puts(json_file.to_json) }
end

def fix_exshell_xml(filename, url)
  doc = Document.new File.read(filename)
  elements = doc.root.elements[1].elements['string']
  elements.text = url
  File.open(filename, 'w') { |file| doc.write(file) }
end

def fix_exshells(url)
  fix_exshell_xml './ios/it-s-hospitality/Supporting/EXShell.plist', url
  fix_exshell_xml './ios/it-s-hospitality/Supporting/EXShell.plist.bak', url
  fix_exshell_json './ios/it-s-hospitality/Supporting/EXShell.json', url
end

# validate arg
new_url = ARGV[0]
unless new_url
  puts "Missing Exp Url\nUsage:  #{$0} [EXPO_URL]"
  return
end

# main
fix_exshells new_url

Usage:
./replace_url.rb [EXPO SERVER URL]

Example Usage:
./replace_url.rb expMqNAvBkGAAgkAWARazDJsNL3dCK9Lrru://192.168.1.2:19000