chat-logger.sh

#!/bin/bash

channel="$1"
oauth_username="justinfan80393"
oauth_token="SCHMOOPIIE"
log_file="$2"

get_timestamp() {
  TZ="America/Los_Angeles" date +"[%Y-%m-%dT%H:%M:%S.%3N%:z]"
}

while true; do
  exec 3>&- 3<>/dev/tcp/irc.chat.twitch.tv/6667

  if [[ $? -ne 0 ]]; then
    echo "Failed to connect to Twitch IRC server"
    exit 1
  fi

  echo "PASS $oauth_token" >&3
  echo "NICK $oauth_username" >&3
  echo "JOIN #$channel" >&3

  while read -r -u 3 line; do
    if [[ "$line" =~ ^PING ]]; then
      echo "${line/PING/PONG}" >&3
      continue
    fi

    if [[ "$line" =~ :(.*)\!.*\ PRIVMSG\ #$channel\ :(.*)$ ]]; then

      log="$(get_timestamp) ${BASH_REMATCH[1]}: ${BASH_REMATCH[2]}"

      if [[ -n $log_file ]]; then
        echo $log >> $log_file
      else
        echo $log
      fi
    fi

  done

done