#!/usr/bin/env ruby
require 'etc'

commands = {}
File.readlines(File.join(Etc.getpwuid.dir, '.zsh_history')).each do |l|
  l = l.encode('utf-8', 'binary', :undef => :replace)
  next if l == ''
  next unless l.match(/: \d+:/)
  l = l.sub(';','[SPLIT]').split('[SPLIT]')
  key = l.last.split.first
  commands[key] = 0 unless commands.key? key
  commands[key] += 1
end

most_used = commands.reject { |k, v| v < 10 || k.size < 4 || k.start_with?('exe/') || k.start_with?('scripts/') || k.start_with?('script/') || k.start_with?('bin') || k.start_with?('./') }.map { |k, v| [v, k]}.sort_by { |a| a.first }.reverse[0..20]

puts 'Top 20 most used commands'
most_used.each do |n, k|
  puts "[#{k}] #{n}"
end