JSON output for top (1)

jsontop

#!/usr/bin/env ruby

require "optparse"
require "json"
require "open3"
params = ARGV.getopts("cu:")

c_opt = params["c"] ? "-c" : ""
u_opt = params["u"] ? "-u #{params['u']}" : ""

o, e, s = Open3.capture3("COLUMNS=512 top -b -n 1 #{c_opt} #{u_opt}")

if s.exitstatus == 0
  keys = %w[PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND]
  data = o.each_line.drop(7).map {|line|
    values = line.match(/\A\s*(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(.+?)\s*\Z/).captures
    [keys, values].transpose.to_h
  }
  puts JSON.dump({ status: s.exitstatus, message: e.chomp, data: data })
else
  puts JSON.dump({ status: s.exitstatus, message: e.chomp, data: [] })
end