Sean's Ruby Helpers

seans-ruby-helpers.rb

<<-HOW_TO_USE

Paste this line into any ruby console if you dare:

require 'net/http'; url = 'https://gist.githubusercontent.com/seanlerner/092ce4caec301d758b524adbd715242a/raw/seans-ruby-helpers.rb'; eval(Net::HTTP.get(URI(url)))

HOW_TO_USE

def exception_message(exception)
  if exception.message.include?("undefined method `include'")
    "Fail! Sean's Ruby Helpers must be invoked from `main` and not from within a method (e.g. trying to invoke while using binding.pry inside a method will not work)"
  else
    "Unhandled Error: #{exception}. Please post a comment with the details on the gist: https://gist.github.com/seanlerner/092ce4caec301d758b524adbd715242a"
  end
end

begin

  require 'active_support/all'
  require 'action_view'
  require 'csv'
  require 'net/http'

  include ActionView::Helpers::DateHelper

  # BENCHMARK

  def measure_execution_time
    Benchmark.measure do
      yield
    end.real.round(1).to_s + " seconds"
  end

  # MEMORY

  def memory_usage_mb
    memory_in_kb = `ps -o rss -p #{$PROCESS_ID}`.chomp.split("\n").last.strip.to_i
    memory_in_kb / 1024
  end

  def memory_usage_mb_to_s
    "#{memory_usage_mb} MB"
  end

  # TERMINAL

  def keep_alive
    puts "Keeping Alive ... press control-c to interrupt"

    seconds = 0

    2.hours.to_i.times do
      print "\rhello: #{seconds}"
      sleep 1
      seconds += 1
      print "\rworld: #{seconds}"
      sleep 1
      seconds += 1
    end

    puts "Done"
  end

  # CSV

  def csv_to_h(csv_path)
    CSV.open(csv_path, headers: :first_row, header_converters: :symbol).map(&:to_h)
  end

  def array_to_csv(file_name, array)
    headers = csv_line(array.first.keys)

    lines = [headers] + array.map(&:values).map { |values| csv_line(values) }

    File.write(file_name, lines.join("\n"))
  end

  def csv_line(values)
    values = sanitize(values)

    values.map { |value| %("#{value}")}.join(',')
  end

  def sanitize(values)
    return values unless values.any? { |value| value.to_s.include?('"') }

    puts %(WARNING! The following entry has a value with a double quote: #{values.join('|') })

    values.map { |value| value.to_s.gsub('"', "'") }
  end

  # HASH DIFF

  def hash_diff(hash_1, hash_2)
    keys = (hash_1.keys + hash_2.keys).sort.uniq

    print_line_diff('{', '{')

      keys.each_with_index do |key, index|
        comma   = index + 1 < keys.count ? ',' : ''
        key_str = key.inspect
        value_1 = hash_1[key].inspect + comma
        value_2 = hash_2[key].inspect + comma

        print_line_diff("  #{key_str} => #{value_1}", "  #{key_str} => #{value_2}")
      end

    print_line_diff('}', '}')
  end

  def print_line_diff(result_1, result_2)
    screen_width        = STDOUT.winsize.last
    hash_2_column_start = screen_width / 2
    spacing             = result_1.ljust(hash_2_column_start - 1)[/ +$/]
    yellow              = "\e[1;33m"
    reset               = "\e[0;0m"

    unless result_1 == result_2
      result_1 = "#{yellow}#{result_1}#{reset}"
      result_2 = "#{yellow}#{result_2}#{reset}"
    end

    puts result_1 + spacing + result_2
  end

  # HTTP

  def get(url)
    Net::HTTP.get(URI(url))
  end

  # INTERESTING METHODS

  class Object

    def im
      interesting_methods
    end

    def interesting_methods
      if self.class == Module
        (singleton_methods + instance_methods).uniq.sort
      else
        (public_methods - Object.methods).sort
      end
    end

    def self.interesting_methods
      (public_methods - Object.methods).sort
    end

  end

  # HELPER HELPERS

  def ready
    revisions_html = get('https://gist.github.com/seanlerner/092ce4caec301d758b524adbd715242a/revisions')
    last_update    = time_ago_in_words(revisions_html.scan(%r{datetime="(.+?)"}).first.first)

    "Success! Sean's Ruby Helpers are ready to use. Last update #{last_update} ago."
  end

  # ALIASES

  alias ka  keep_alive
  alias mb  memory_usage_mb
  alias mbs memory_usage_mb_to_s
  alias me  measure_execution_time

rescue StandardError => exception
  @exception = exception_message(exception)
end

# Finished

@exception || ready