Ruby Projects and Libraries

Ruby Projects and Libraries Vorleak Chy (vorleak.chy@gmail.com) Software Engineer Yoolk Inc http://groups.google.com/group/khmertech/

Agenda Projects and Using Code from Other Files Libraries RubyGems

Introduction Using code already written and prepared by other developers within your own applications

Projects and Using Code from Other Files Basic File Inclusion Inclusions from Other Directories Logic and Including Code Nested Inclusions

Basic File Inclusion Uses the require or load command to load the external file into the current program #file: string_extensions.rb class String def vowels self.scan(/[aeiou]/i) end end #file: vowel_test.rb require 'string_extensions' puts "This is a test".vowels.join('-')

Basic File Inclusion (Cont.) Ruby programmers generally use require rather than load. The effects of load are only useful if the code in the external file has changed or if it contains active code that will be executed immediately #file: b.rb load 'a' puts "Hello from b.rb" load 'a' puts "Hello again from b.rb" #result output Hello from a.rb Hello from b.rb Hello from a.rb Hello again from b.rb #file: a.rb puts "Hello from a.rb"

Inclusions from Other Directories The process of require and load First looks the file in the current folder Second looks the file in the various folders where Ruby stores its own file and libraries Lists of directories to search for included files in a special variable called $:. $:.each { |d| puts d } /usr/local/lib/ruby/site_ruby/1.8 /usr/local/lib/ruby/site_ruby/1.8/i686-darwin8.8.1 /usr/local/lib/ruby/site_ruby ...

Inclusions from Other Directories (Cont.) Adds extra folders to search the file $: is an array, so you can push extra items to it $:.push '/your/directory/here' require 'yourfile'

Logic and Including Code Adds logic to the require or load command $debug_mode = 0 require $debug_mode == 0 ? "normal-classes" : "debug-classes" %w{file1 file2 file3 file4 file5}.each { |l| require l }

Nested Inclusions Code from files that are included into others with require and load has the same freedom as if the code were pasted directly into the original file. #file: a.rb require 'b' #And b.rb contains the following: require 'c' #And c.rb contains the following: def example puts "Hello!" end #And d.rb contains the following: require 'a' example

Libraries Collection of routines that can be called by separate programs, but that exist independently of those programs. A list of all the standard libraries, including documentation, is available at http://www.ruby-doc.org/stdlib/ How to use two standard libraries

net/http Library HTTP stands for HyperText Transfer Protocol, and it’s the main protocol that makes the World Wide Web work, as it provides the mechanism by which Web pages, files, and other media can be sent between Web servers and clients require 'net/http' Net::HTTP.get_print('www.rubyinside.com', '/') require 'net/http' url = URI.parse('http://www.rubyinside.com/') response = Net::HTTP.start(url.host, url.port) do |http| http.get(url.path) end content = response.body

OpenStruct Library More flexible than Struct Creates data objects without specifying the attributes Create attributes on the fly #struct Person = Struct.new(:name, :age) me = Person.new("Fred Bloggs", 25) me.age += 1 #openStruct require 'ostruct' person = OpenStruct.new person.name = "Fred Bloggs" person.age = 25

RubyGems Packaging system for Ruby programs and libraries. Manages different versions of the same libraries on your PC

Installing RubyGems Before you can use RubyGems, it’s necessary to install it On Windows, if you installed Ruby using the “one-click installer”, you already have RubyGem installed On Mac OS X, Linux, and Other Unix After you installed you can type gem

Finding Gems Lists of the gems that are installed gem list Queries the remote gem server gem list --remote gem query --remote --name-matches class Queries the remote gem server and match the name “class”

Installing a Simple Gem Installs “feedtools” gem install feedtools #if it can't install probably sudo gem install feedtools

Using Gems RubyGems system isn’t an integrated part of Ruby It’s necessary to tell your programs that you want to use and load gems require 'rubygems' require 'RedCloth' r = RedCloth.new("this is a *test* of _using RedCloth_") puts r.to_html

Installing a More Complex Gem You may want to install “hpricot” in specific source for latest version gem install hpricot --source code.whytheluckystiff.net

Upgrading and Uninstalling Gems Update all of your currently installed gems gem update Uninstall gems “feedtools” gem uninstall feedtools $ gem uninstall rubyforge Uninstall all gem versions “rubyforge”

Thank-you for attending Feel free to join at http ://groups.google.com/group/khmertech/ KhmerTech

Ruby Projects and Libraries

More Related Content

What's hot (20)

Viewers also liked (6)

Similar to Ruby Projects and Libraries (20)

Recently uploaded (20)

Ruby Projects and Libraries

Editor's Notes