get version info from weechat relay

weechat-relay-info.lua

#!/usr/bin/lua
-- libraries: lua-socket, lua-sec, lua-argparse
-- weechat relay documentation: https://weechat.org/files/doc/stable/weechat_relay_protocol.en.html
local socket = require("socket")
local ssl = require("ssl")
local argparse = require "argparse"

-- Setup CLI options - docs: https://argparse.readthedocs.io/en/stable/index.html
local parser = argparse() {
  name = "Weechat relay info",
  description = "Connect to weechat relay and get the version information.",
  epilog = "Author contact: hello@doloresportalatin.info, Licesnse: GPLv3"
}

parser:option "-H --host"
    :description "Host to connect to."
    :count "1"
    :args "1"

parser:option("-P --port")
    :description "Port number."
    :default "9001"
    :count "1"
    :args "1"

parser:option("-p --password")
   :description "The password for your relay."
   :count "1"
   :args "1"

local args = parser:parse()

-- TLS/SSL client parameters
local params = {
  mode = "client",
  protocol = "tlsv1",
--  cafile = "/path/to/downloaded/cert.pem", for weechat you can download at https://host:port/weechat
--  verify = "peer", for self signed cert
  verify = "none",
  options = "all",
}

-- Create the connection
local conn = socket.tcp()
conn:connect(args.host, args.port)
print(string.format("Connecting to %s:%s", args.host, args.port))

-- TLS/SSL initialization
conn = ssl.wrap(conn, params)
conn:dohandshake()
if conn then
    print("Connected via ssl")
end

-- if password has commas they need to be escaped `\,` - write code to do this
-- init password=foo\,bar to send the password "foo,bar"
login = string.format("init password=%s\n", args.password)
conn:send(login)
conn:send("info version\n")

while true do
    local line, status = conn:receive(1024)
    if status == "closed" then
        print(status)
        break
    else
        print(line)
    end
end
conn:close()

https://stackoverflow.com/questions/35411027/receiving-data-from-lua-tcp-socket-without-data-size
http://lua-users.org/wiki/StructurePacking
https://stackoverflow.com/questions/9013290/lua-socket-client
https://stackoverflow.com/questions/16004612/how-do-i-use-socket-select