Stanislav Pankevich stanislaw

Jamie's handy tidbits

Convert all .erb files in a directory to haml and delete the .erb files

find . -name '*erb' | xargs ruby -e 'ARGV.each { |i| puts "html2haml -r #{i} #{i.sub(/erb$/,"haml")};rm #{i}"}' | bash

Setup postgres http://shifteleven.com/articles/2008/03/21/installing-postgresql-on-leopard-using-macports

Add a postgres user

sudo -u postgres createuser -S -D -R -P your_user_name

Let's say you have a model, with an files attached, using Paperclip. You have a couple millions of those files and you're not sure that every one of them (and all its thumbnails) are still used by a database record.

You could use this rake task to recursively scan all the directories and check if the files need to be kept or destroyed.

In this example, the model is called Picture, the attachment is image and the path is partitioned like images/001/412/497/actual_file.jpg

The task is going down the path. Each time the path ends with 3 triplets of digits ("001/412/497" for example) it looks for a record with the ID 1412497. If such a record doesn't exist, the whole directory is moved to a parallel images_deleted directory. At the end you can delete the files if you like, or move them to an archive location.

You can use the "dry run" mode : to print which files would be removed

Howdy howdy, NSHipsters!

If you alloc init an NSCalendar, you'll notice that New Year's Eve falls on a Monday this year, a.k.a. "the day NSHipster is published every week". What fun!

So in celebration of the upcoming year++, I thought it'd be fun to compile a list of some of your favorite tips and tricks of the trade. Submit your favorite piece of Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

Here are a few examples of the kind of things I'd like to see:

StaticObjcMethods from [Apple]((http://developer.apple.com/library/mac/#samplecode/CocoaTipsAndTricks/Introduction/Intro.html): Demonstrates how to use static Objective-C m

	# Create a file `spec/acceptance/support/warden.rb' with the following
	# contents:

	Spec::Runner.configure do \|config\|
	config.include Warden::Test::Helpers, :type => :acceptance
	config.after(:each, :type => :acceptance) { Warden.test_reset! }
	end

	# Or, if you're using RSpec 2 / Rails 3, the contents should be the following
	# instead:

	def tip(msg); puts; puts msg; puts "-"*100; end

	#
	# 30 Ruby 1.9 Tips, Tricks & Features:
	# http://www.igvita.com/2011/02/03/new-ruby-19-features-tips-tricks/
	#

	tip "Upgrading to Ruby 1.9 is simple: rvm install 1.9.2 && rvm --default 1.9.2"

	tip "Ruby 1.9 supports named captures in regular expressions!"

	require 'spork'

	Spork.prefork do
	# Loading more in this block will cause your tests to run faster. However,
	# if you change any configuration or code from libraries loaded here, you'll
	# need to restart spork for it take effect.

	# This file is copied to spec/ when you run 'rails generate rspec:install'
	ENV["RAILS_ENV"] \|\|= 'test'
	require File.expand_path("../../config/environment", __FILE__)

	require 'rubygems'
	require 'spork'

	ENV["RAILS_ENV"] = 'test'

	Spork.prefork do

	require 'cucumber/rails'
	require 'capybara/rails'

	#!/usr/bin/env ruby

	require 'rubygems'
	require 'solareventcalculator'

	solar = SolarEventCalculator.new(Date.today, BigDecimal.new('51.563'), BigDecimal.new('-0.499'))

	puts "Sunrise: #{solar.compute_utc_civil_sunrise.getlocal}"
	puts "Sunset: #{solar.compute_utc_civil_sunset.getlocal}"

	/home/stanislaw/work/gems/ruby-vips/spec/vips/relational_spec.rb:31: [BUG]
	Segmentation fault
	ruby 1.9.3p125 (2012-02-16 revision 34643) [i686-linux]

	-- Control frame information -----------------------------------------------
	c:0022 p:---- s:0081 b:0081 l:000080 d:000080 CFUNC :more
	c:0021 p:0020 s:0077 b:0077 l:000f54 d:000076 BLOCK
	/home/stanislaw/work/gems/ruby-vips/spec/vips/relational_spec.rb:31
	c:0020 p:---- s:0074 b:0074 l:000073 d:000073 FINISH
	c:0019 p:---- s:0072 b:0072 l:000071 d:000071 CFUNC :instance_eval

	#!/usr/bin/env ruby

	require 'rubygems'

	gem 'ruby-vips'
	gem 'oil'

	require 'vips'

	require 'oil'