Colors standard syslog output and groups by service name

color-log

#!/usr/bin/env ruby
# Colors standard syslog output and groups by service name

require 'time'

services = []

STDIN.each_line do |line|
  match = line.strip.match(/\A(?<timestamp>[\w]{3} \d+ \d\d:\d\d:\d\d) (?<hostname>[\w\d\-]+) (?<service>.+?): (?<message>.+)\z/)
  if match
    timestamp = Time.parse(match[:timestamp]).strftime('%y-%m-%d %H:%M:%S')
    hostname = match[:hostname]
    service = match[:service].gsub(/\[\d+\]/, '') # Remove optional PID suffix
    message = match[:message]
    services << service unless services.include?(service)
    color = services.index(service) % 6 + 31 # One of the primary terminal colors

    puts "\033[#{color}m#{timestamp} \033[1m#{hostname}\033[22m #{service}\033[39m #{message}"
  else
    puts line
  end
end