ruby14kyoto

14th Ruby Kansai Workshop

New place – now the usual computer lab. We are devided in groups – A,B,C etc. Hm, maybe some team working ahead ;)

I decided to change my usual way of taking notes (gedit ;)) and installed JunebugWiki + litespeed on my notebook. Pretty cool – notes powered by textile.

The world of Ruby

Hm, maybe the title of the lesson is not right.

Nishimoto-san (keisuken)

Always using some java-powered presentation tool.

What is Ruby?

What exactly is Ruby – interpreter? compiler?

using virtual mchine

JIT AOT

Ruby can run several application inside one VM? (no sandboxes?)

C Ruby

YARV

Still not ready – maybe after 1-2 years

JRuby

http://jruby.codehaus.org/

Using Java VM. parsing parse.y from inside Ruby sources. Ruby 1.8 compatible. Maybe J2EE+RoR will be good for the enterprise.

xruby

http://code.google.com/p/xruby/

Using Java VM. Have compiler and runtime. Ruby 1.8 compatible. Need to compile the code every time (what for scripts?)

Rubinius – Evan Phoenix

http://blog.fallingsnow.net/rubinius/

BSD Licence. written in C, bytecode compiler and interpreter. Smalltalk bulebook. Very small runtime – for embedded systems?

RubyCLR – John Lam

http://www.rubyclr.com/

MIT license, Windows .NET framework, C++ → .NET bridge. CLR is .NET VM.

Benchmark

Several basic algorithms – count,compare,array,fib

YARV is good and quick. Already in the trunk(1.9). Maybe there will be JRuby release in february?

The libraries are important. Cool and easy to use, if possible ;) Problematic/missing libs in Ruby: GUI, Multimedia But if you search – there is a lot already done: Ruby/Tk, Ruby-GNOME2 etc. Where to found them: RAA, sf.net, rubyforge etc.

Questions

Ruby on top Parot? (Perl is doing this)

Plagger meets Ruby

yhara-san (Yataka Hara) Ruby/SDL starter kit, Down! game (there was 2ch annonce

manga-like dialogs with cute girl hahahaha – japanese style

What is Plagger

automatic RSS information getting (aggregator)

input-process-output example: blog_rss – process – announce to IRC example: Ruby site (ruby-lang) – find news and send them to gmail

Internals

YAML config: global and plugins sections

global: ...
plugins:
  module: .... (input)
  module: .... (process)
  module: .... (output)

Automation via cron. Plagger plugins are in Perl. Pipe between plagger and ruby. $stdin and $stdout

Plagger - (pipe with text data) - $stdin Ruby $stdout - (pipe with text) - Plagger

Plugins

CustomFeed::Script, Filter::Pipe, Filter::RubyMan, Filter::Tateyomi, Publish::Pipe

Plagger only working with title and links, no other RSS elements

Plagger installation

cpan:

>force install Plagger

http://8-p.info/Plagger/

Questions

PRagger – system in pure ruby, plugins in ruby plagger.rb – just call plagger from the command line

system "plagger ..."

Lightning talk

okkez-san

ruby/tk what is the topic? – ruby documentation? who is sheepman?

kazuhiko-san

letmesee+royal-fpw: Using electronic dictionary data from the browser (HTML output)

what is letmesee?

EB library – C library for dictionaries, EPWING format (JISX0208) of data
RubyEB library – using EB from Ruby (also in C)
letmesee – CGI using RubyEB
bookmarklet (JavaScript)

what is royal-fpw? FreePWING – software for creating EPWING cdroms with data? written in Perl

No need to be expert in every language – perl, c etc. Just try. Happy hacking!

Beginners Lesson #11 – okkez-san

irb basic usage, irb config customize, debug with irb

okkez-san, sakai-san (konami-san student)

What is irb?

interactive shell, come by default with ruby

there is something named irbsh.

irb(main):001:0> '%03d' %1
=> "001" 
irb(main):002:0> '%*s' %[10,'aaa']
=> "       aaa" 
irb(main):003:0> 'a' *20
=> "aaaaaaaaaaaaaaaaaaaa"

Type of prompts: XMP, DEFAULT, NULL, CLASSIC, SIMPLE, INF_RUBY (when using irb in emacs mode)

IRB/conf[:PROMPT] =
{:XMP =>
  {:PROMPT_I => nil,
  ...

on *nix: ~/.irbrc

interesting .irbrc

def ri(*args)
  puts `ri "#{args.join(' ')}"`
end

IRB.conf[:EVAL_HISTORY] = 1000

require 'irb/completion'

# history
require 'irb/ext/save-history'
IRB.conf[:SAVE_HISTORY] = 100
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history" 

require 'pp'
require 'yaml'

The difference between load ”..” and require ”..” : load rereading the file, if it is changed. load is mostly for config files.

Other usages

rails script/console, iar (interactive active record), irbdb

irb subsession

type irb from the irb:

# subsession
irb(main):001:0> irb
irb#1(main):001:0> jobs
=> #0->irb on main (#<Thread:0xb7d29748>: stop)
#1->irb#1 on main (#<Thread:0xb7b99e40>: running)

# send an object
irb(main):002:0> irb Array
irb#1(Array):001:0> def hoge
irb#1(Array):002:1> puts 'Hoge'
irb#1(Array):003:1> end
=> nil
irb#1(Array):004:0> [].hoge
Hoge
=> nil