trim_log.rb

#!/usr/bin/ruby
#
# trim.rb - trim sensor & scenario log
#

def usage
	puts <<-EOS
usage : ./trim_log.rb [start_time] [end_time] [file]"

example:
      $ ./trim_log.rb 11:30 12:00 sensor_log.txt
      $ ./trim_log.rb 13:00 15:45 scenario_log.txt

EOS
	exit -1
end

def to_millis(str)
	(h, m) = str.split(":").map {|s| s.to_i}
	Time.new(2014, 3, 1, h, m, 0, "+09:00").to_i * 1000
end

usage if ARGV.size < 2

trim_st = to_millis(ARGV[0])
trim_et = to_millis(ARGV[1])
filename = ARGV[2]

f = open(filename);
while !f.eof
	l = f.gets
	ss = l.split(",")
	t = ss[0].to_i
	next if t < trim_st || trim_et <= t
	puts l
end