#!/usr/bin/env ruby
# Finds the latest Passenger crash log directory and prints its path.
# This tool is meant to make it easy to analyze local Passenger crash
# logs during debugging sessions. Instead of searching for the crash
# log directory path in the output and then copy-pasting that to the
# terminal, one can simply invoke one shell command:
#
#   less $(./dev/show-latest-crashlog-dir)/backtrace.log
#
# This will open the latest crash log's backtrace.log in 'less'.

def parse_path(path)
  File.basename(path).split('.')[1].to_i
end

def main
  dirs = Dir["/var/tmp/passenger-crash-log.*.*"].sort do |a, b|
    parse_path(a) <=> parse_path(b)
  end
  if dirs.empty?
    abort "No /var/tmp/passenger-crash-log.* directories found."
  else
    puts dirs.last
  end
end

main