Janosch Müller jaynetics

How to create a Ruby gem that adds Rake tasks

Create a gem

One way to do this is to use bundler to scaffold our gem:

bundler gem my_gem

Add rake tasks to our gem

I prefer to put tasks meant to manage the gem itself in lib/tasks, and tasks the gem is meant to provide to gem users in lib/my_gem/tasks.

Extracting Emoji From Slack!

Slack doesn't provide an easy way to extract custom emoji from a team. (Especially teams with thousands of custom emoji) This Gist walks you through a relatively simple approach to get your emoji out.

If you're an admin of your own team, you can get the list of emoji directly using this API: https://api.slack.com/methods/emoji.list. Once you have it, skip to Step 3

HOWEVER! This gist is intended for people who don't have admin access, nor access tokens for using that list.

Follow along...

You won’t find rants on how functional programming improves you, your sanity and your life overall here. There are some examples in the very beginning to save you some time on reading the whole post, just come along if you don’t like how they look like.

By the way, this is not even a blog, so formally this is not even a blog post. This is not a library or a new paradigm. It’s just a few pieces of code that might come handy for your daily job.

Example:

[1, 3.14, -4].map &_.safe{ magnitude odd? } # => [true, nil, false]

	[color "blame"]
	highlightRecent = 234, 23 month ago, 235, 22 month ago, 236, 21 month ago, 237, 20 month ago, 238, 19 month ago, 239, 18 month ago, 240, 17 month ago, 241, 16 month ago, 242, 15 month ago, 243, 14 month ago, 244, 13 month ago, 245, 12 month ago, 246, 11 month ago, 247, 10 month ago, 248, 9 month ago, 249, 8 month ago, 250, 7 month ago, 251, 6 month ago, 252, 5 month ago, 253, 4 month ago, 254, 3 month ago, 231, 2 month ago, 230, 1 month ago, 229, 3 weeks ago, 228, 2 weeks ago, 227, 1 week ago, 226
	[blame]
	coloring = highlightRecent
	date = human

	# Put this function to your .bashrc file.
	# Usage: mv oldfilename
	# If you call mv without the second parameter it will prompt you to edit the filename on command line.
	# Original mv is called when it's called with more than one argument.
	# It's useful when you want to change just a few letters in a long name.
	#
	# Also see:
	# - imv from renameutils
	# - Ctrl-W Ctrl-Y Ctrl-Y (cut last word, paste, paste)

	# frozen_string_literal: true

	require "bundler/inline"
	require "csv"

	STDOUT.sync = STDERR.sync = true

	gemfile do
	source "https://rubygems.org"
	gem "http"

	# @see https://docs.aws.amazon.com/ja_jp/AmazonCloudFront/latest/DeveloperGuide/LocationsOfEdgeServers.html
	# @see https://morizyun.github.io/ruby/rails-controller-get-ip.html
	# @see https://dev.classmethod.jp/cloud/aws/get-ec2-public-ip-range-by-powershell/
	# @see https://github.com/rails/rails/blob/c81af6a/actionpack/lib/action_dispatch/middleware/remote_ip.rb#L112-L150
	Rails.application.configure do
	ip_ranges_res = Faraday.get('https://ip-ranges.amazonaws.com/ip-ranges.json')
	ip_ranges = JSON.parse(ip_ranges_res.body)
	cloudfront_ips = ip_ranges['prefixes'].select { \|v\| v['service'] == 'CLOUDFRONT' }.map { \|v\| IPAddr.new(v['ip_prefix']) } +
	ip_ranges['ipv6_prefixes'].select { \|v\| v['service'] == 'CLOUDFRONT' }.map { \|v\| IPAddr.new(v['ipv6_prefix']) }

	while(true) do
	begin
	print '> '
	input = STDIN.readline.chop
	output = eval(input)
	puts "=> #{output}"
	rescue StandardError => e
	puts "Error: #{e.message}"
	end
	end

	Gemfile

	gem 'paper_trail'
	gem 'diffy'
	gem 'activerecord-diff'

	# view

	= title "Logs"

	def fill_stripe_elements(card)
	using_wait_time(15) { within_frame('stripeField_card_element0') do
	card.to_s.chars.each do \|piece\|
	find_field('cardnumber').send_keys(piece)
	end

	find_field('exp-date').send_keys("0122")
	find_field('cvc').send_keys '123'
	find_field('postal').send_keys '19335'
	end }