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April 19, 2018 11:41
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Relative times within log files
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#!/usr/bin/env ruby | |
# Takes a log where lines have [HH:MM:SS] in front of the lines, and turns them | |
# into +HH:MM:SS since start of the script (ie. relative times). | |
# | |
# Any line that has no time at the start will be printed as is. | |
# | |
# Usage: relative_time_logs < some.log | |
time_regex = /^\[(?<hours>\d\d):(?<minutes>\d\d):(?<seconds>\d\d)\]/ | |
STDIN.each_line.reduce(nil) do |start_time, line| | |
match = line.match(time_regex) | |
# If the line doesn't start with a time, just leave it alone. | |
unless match | |
puts line | |
next start_time | |
end | |
hours = match[:hours].to_i | |
minutes = match[:minutes].to_i | |
seconds = match[:seconds].to_i | |
line_time = (hours * 60 * 60) + (minutes * 60) + seconds | |
start_time = line_time if start_time.nil? | |
seconds_diff = line_time - start_time | |
puts line.sub(time_regex, "[+#{Time.at(seconds_diff).utc.strftime('%H:%M:%S')}]") | |
start_time | |
end |
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