andrepiske

# That damn GetPercentageRounds function I keep seeingin LinkedIn and Twitter
# but in ruby, refactored, without telling why or whether is morally good or bad.
# Just a function.
def GetPercentageRounds(v)
  x = [10, [0, (10 * v).to_i].max].min
  '🔵' * x +('⚪️' * (10 - x))
end

# irb(main):053:0> bar(0.1)
# => "🔵⚪️⚪️⚪️⚪️⚪️⚪️⚪️⚪️⚪️"

andrepiske

def arraydiff(ref, other, key=[])
  keyname = key.join('.')
  desc = []
  (other - ref).each do |e|
    desc << "#{keyname}: Added '#{e}'"
  end
  (ref - other).each do |e|
    desc << "#{keyname}: Removed '#{e}'"
  end

andrepiske

#!/usr/bin/env ruby
require 'uri'
want_cmd = false
args = ARGV.select do |a|
  if a == '--print'
    want_cmd = true 
    false
  else
    true
  end

andrepiske

require 'uri'; require 'cgi'
def uri_extract_params(url_str)
  u = URI.parse(url_str)
  u.query.split('&').map { |x| x.split('=', 2).map { |c| c ? CGI.unescape(c) : nil } }
end

andrepiske

r = Redis.new(url: ENV['REDIS_URL'])

def fetch_all_keys(r, batch: 10_000, match: nil)
  cursor = '0'
  all_keys = []
  loop do
    cursor, k = r.scan(cursor, count: batch, match: match)
    all_keys += k
    break if cursor == '0'
  end

andrepiske

######################
## Count estimate

SELECT reltuples::bigint AS estimate FROM pg_class WHERE relname='table_name';

######################
## Table size in disk
# source: https://stackoverflow.com/a/2596678/375888

andrepiske

# Calculates sha256 HMAC signature for a given payload
# Useful to check webhook signatures from e.g. github or stripe
def calculate_signature(data, key, algorithm='SHA256')
  digest = OpenSSL::Digest.new(algorithm)
  hmac = OpenSSL::HMAC.new(key, digest)
  hmac << data

  hmac.hexdigest
end

andrepiske

def unlolify(n);s=n.to_s(2);s.rjust((s.length/8.0).ceil*8,'0').split('').each_slice(8).to_a.map{|x|x.join.to_i(2).chr}.join;end

def lolify(s);s.split('').map{|x|x.ord.to_s(2).rjust(8,'0')}.join;end

# > unlolify(lolify('Hello, world!').to_i(2))
# => "Hello, world!"