Simple command line interface to Google Translate API

gtrans

#!/usr/bin/env ruby

# Inspired by https://ctrlq.org/code/19909-google-translate-api.
# I usually keep these things under ~/bin...

require 'net/http'
require 'cgi'
require 'json'

# quit unless our script gets two command line arguments
if ARGV.empty?
  file = File.basename(__FILE__)
  warn 'Oops... wrong number of arguments.'
  warn "Usage: #{file} <text-to-translate> [from:pt] [to:en]\n"
  exit
end

st = ARGV[0]         # source text
sl = ARGV[1] || 'pt' # source language
tl = ARGV[2] || 'en' # target language
est = CGI.escape(st) # encoded source text

# build http request to google's translate api
endpoint = 'https://translate.googleapis.com/translate_a/single'
params = "client=gtx&sl=#{sl}&tl=#{tl}&dt=t&q=#{est}"
http_request = "#{endpoint}?#{params}"

# parse response
response = Net::HTTP.get_response URI.parse(http_request)
translation = JSON.parse(response.body)

# print it
puts translation[0].map { |t| t[0] }.join