varnishlog-colour.rb

#!/usr/bin/env ruby

log = IO.popen("varnishlog -o")
loop do
  Signal.trap('INT'){ exit 0}

  while line = log.readline
    next unless line =~ /^\s+\d+\s+([A-Z]\w+)\s+[-cb]\s(.*)$/
    head, line = $1, $2
    colour     = case head
      when /RxURL/       then 34
      when /Hit/         then 32
      when /ObjHeader/   then 35
      when /[TR]xHeader/ then 33
      when /Error/       then 31
      when /CLI/         then next # skip to the next line
      else 0
    end
    puts "\033[1;#{colour}m%-13s\033[0m %s" % [head, line]
  end
end