DZone Snippets: Jswizard's Code Snippets

Create a UNIX init.d startup script with Ruby

jswizard (JavaScript Wizard) — Mon, 25 Sep 2006 21:30:43 GMT



#!/usr/bin/env ruby

#

# app_name      This is a startup script for use in /etc/init.d

#

# chkconfig:    2345 80 20

# description:  Description of program / service



APP_NAME = 'app_name'



case ARGV.first

	when 'status':

    	status = 'stopped'

        puts "#{APP_NAME} is #{status}"

	when 'start':

		# Do your thang

    when 'stop':

		# Do your thang

	when 'restart':

		# Do your thang		

end



unless %w{start stop restart status}.include? ARGV.first

        puts "Usage: #{APP_NAME} {start|stop|restart}"

        exit

end

UTF-8 compatible String ranges in Ruby

jswizard (JavaScript Wizard) — Wed, 06 Sep 2006 06:25:55 GMT

As found at http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/123935



class String

        def [] (*params)

                if params.all? { |p| Integer===p } ||

                   params.size==1 && Range===params[0]

                        res = self.unpack("U*").[](*params)

                        res = [res] unless Array===res

                        return res.pack("U*")

                end

                super

        end

end

Create YAML test fixtures from database in Rails

jswizard (JavaScript Wizard) — Mon, 04 Sep 2006 01:48:31 GMT

As found at http://media.pragprog.com/titles/fr_rr/code/CreateFixturesFromLiveData/lib/tasks/extract_fixtures.rake



desc 'Create YAML test fixtures from data in an existing database.  

Defaults to development database.  Set RAILS_ENV to override.'



task :extract_fixtures => :environment do

  sql  = "SELECT * FROM %s"

  skip_tables = ["schema_info"]

  ActiveRecord::Base.establish_connection

  (ActiveRecord::Base.connection.tables - skip_tables).each do |table_name|

    i = "000"

    File.open("#{RAILS_ROOT}/test/fixtures/#{table_name}.yml", 'w') do |file|

      data = ActiveRecord::Base.connection.select_all(sql % table_name)

      file.write data.inject({}) { |hash, record|

        hash["#{table_name}_#{i.succ!}"] = record

        hash

      }.to_yaml

    end

  end

end

Turn Rake task list into hash with Ruby

jswizard (JavaScript Wizard) — Sun, 27 Aug 2006 06:35:36 GMT



Hash[*(`rake -T`.split(/\n/).collect { |l| l.match(/rake (\S+)\s+\#\s(.+)/).to_a }.collect { |l| [l[1], l[2]] }).flatten]

Exempt directories from Apache's ProxyPass directive

jswizard (JavaScript Wizard) — Thu, 17 Aug 2006 05:25:50 GMT

Very useful if forwarding to Mongrel, etc.



        ProxyPass /stylesheets !

        ProxyPass /javascripts !

        ProxyPass /images !     

        ProxyPass / http://127.0.0.1:3010/

        ProxyPassReverse / http://127.0.0.1:3010/

Using Rio from Ruby to easily save a Web page to file

jswizard (JavaScript Wizard) — Wed, 16 Aug 2006 21:38:21 GMT

Found at http://www.juretta.com/log/2006/08/13/ruby_net_http_and_open-uri/



# (sudo) gem install rio

require 'rubygems'

require 'rio'

# open an URI an copy the content into a file

rio('http://www.juretta.com/') > rio('juretta_index.html')

Cool syntax!

Use the del.icio.us API via HTTPS from Ruby

jswizard (JavaScript Wizard) — Wed, 16 Aug 2006 21:37:15 GMT

Found at http://www.juretta.com/log/2006/08/13/ruby_net_http_and_open-uri/



require 'net/https'

require "rexml/document"



username = "" # your del.icio.us username

password = "" # your del.icio.us password



resp = href = "";

begin      

  http = Net::HTTP.new("api.del.icio.us", 443)

  http.use_ssl = true

  http.start do |http|

    req = Net::HTTP::Get.new("/v1/tags/get", {"User-Agent" => 

        "juretta.com RubyLicious 0.2"})

    req.basic_auth(username, password)

    response = http.request(req)

    resp = response.body

  end     

  #  XML Document

  doc = REXML::Document.new(resp)    

  # iterate over each element 

  doc.root.elements.each do |elem|

    print elem.attributes['tag']  + " -> " + elem.attributes['count'] + "\n"

  end

  

rescue SocketError

  raise "Host " + host + " nicht erreichbar"

rescue REXML::ParseException => e

  print "error parsing XML " + e.to_s

end

Load a Web page in Ruby and print information

jswizard (JavaScript Wizard) — Wed, 16 Aug 2006 21:36:10 GMT

Found at http://www.juretta.com/log/2006/08/13/ruby_net_http_and_open-uri/



require 'open-uri'

require 'pp'



open('http://www.juretta.com/') do |f|

  # hash with meta information

  pp  f.meta

   

  # 

  pp "Content-Type: " + f.content_type

  pp "last modified" + f.last_modified.to_s

  

  no = 1

  # print the first three lines

  f.each do |line|

    print "#{no}: #{line}"

    no += 1

    break if no > 4

  end

end

Put borders around Web page elements with CSS

jswizard (JavaScript Wizard) — Tue, 08 Aug 2006 05:05:12 GMT

Found at http://homepage.mac.com/chrispage/iblog/C42511381/E20060806095030/index.html



  * { outline: 2px dotted red }

  * * { outline: 2px dotted green }

  * * * { outline: 2px dotted orange }

  * * * * { outline: 2px dotted blue }

  * * * * * { outline: 1px solid red }

  * * * * * * { outline: 1px solid green }

  * * * * * * * { outline: 1px solid orange }

  * * * * * * * * { outline: 1px solid blue }

Ordinals for All Numeric Types

jswizard (JavaScript Wizard) — Fri, 04 Aug 2006 22:46:04 GMT

This snippet will extend all numerical types with a method for returning the English ordinal, i.e. 1st, 2nd, 3rd, 4th, etc.



class Numeric

  def ordinal

    cardinal = self.to_i.abs

    if (10...20).include?(cardinal) then

      cardinal.to_s << 'th'

    else

      cardinal.to_s << %w{th st nd rd th th th th th th}[cardinal % 10]

    end

  end

end

 

[1, 22, 123, 10, -3.1415].collect { |i| i.ordinal }

=> ["1st", "22nd", "123rd", "10th", "3rd"]

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