Yes, I just click the invitation link and my Google Wave account immediately active ;).

If you are new about Google Wave, I recommend you to watch Google Wave Developer Preview at Google I/O 2009 below.

or you can watch short video about Google Wave: 15 features if you want to know brief description about Google Wave powers.

I am sorry if I too excited to tell you about Google Wave, don’t worry mate, if you don’t have Google Wave account yet, you can request using Google Wave Developer Sandbox Account Request or you can ask me to invite you, just simply put on comment below, and I will happy to invite you.

I have 20 invitations left on my Google Wave account. Even invitations will not be sent immediately, as Google said, but I hope it will be faster than regular account request.

For those who have Google Wave account, browse to http://wave-samples-gallery.appspot.com to get dozen of robots or gadgets for your Google Wave. Happy waving!

Update:

You can check http://dl.getdropbox.com/u/2689426/google_wave_invitations.png to know the number of invitations left and invitation goes to.

Also read a comprehensive Google Wave user manual, The Complete Guide to Google Wave by Gina Trapani with Adam Pash to learn how to use Google Wave.

GEO199

Yes, use the code when you GEO199 purchase domain at GoDaddy, and the domain prices will come down drastically. One time, when this code is not working, please let me know so I can update this post.

And once again, use this coupon code as soon as possible before expired ;).

Installing RVM is extremely easy.

:~ % gem install rvm
Successfully installed rvm-0.0.24
1 gem installed 

:~ % rvm-install
[... follow the prompts ...]

And everything is installed into ~/.rvm. RVM usage:

:~ % rvm install ruby -v 1.9.1
<i> Installing Ruby from source to: /home/alifity/.rvm/ruby-1.9.1-p243
<i> Extracting ruby-1.9.1-p243...
<i> Configuring ruby-1.9.1-p243 using --enable-shared, this may take a while depending on your cpu(s)...
<i> Compiling ruby-1.9.1-p243, this may take a while, depending on your cpu(s)...
<i> Installing ruby-1.9.1-p243
<i> Installing rubygems dedicated to ruby-1.9.1-p243...
<i> Installation of ruby-1.9.1-p243 complete.
<i> Installing rake

:~ % rvm use 1.9.1
<i> Switching to ruby 1.9.1  ...

:~ % ruby -v
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

:~ % rvm use jruby
<i> Switching to jruby 1.3.1  ...

:~ % ruby -v
jruby 1.3.0 (ruby 1.8.6p287) (2009-06-03 5dc2e22) (Java HotSpot(TM) Client VM 1.6.0_13) [i386-java]

:~ % rvm use default
<i> Switching to default   ...

:~ % ruby -version
ruby 1.8.7 (2008-08-11 patchlevel 72) [i586-linux]

For more examples, look at here.

As noted by RubyInside, RVM is still in its early days, hence, don’t try this on your production boxes. If you want to contribute, join on irc.freenode.net in #rvm channel. And if you have a problem, you can run rvm debug as well as rvm ((command you tried to run)) --debug and post it on online code snippets, then post the url to the channel.

For more information about RVM development progress, you can visit RVM project page on PivotalTracker and Github.

I try to follow some guidelines on building wordpress theme, from basic to hack. Vandelay Design in its post titled “9 WordPress Hacks to Encourage User Interactivity” show me several wordpress hacks to make our blog more interactive. In point 4, Add Custom Bookmark Links, they suggest to add social bookmark button, and they hardcode it. Like:

Hey, waits! Digg as I know have embeddable button, and it is based on javascript, like this:

So based on javascript or hardcoding? Ok.. let’s analyze.

Hardcoding absolutely faster than based on javascript, this is also suitable if you don’t want to show details, like ‘how many who have dugg’ or ‘how many retweet of this post’.

Pros of based on javascript is to make button more interactive, and also show useful information than hardcoding. But, the cons are, as javascript behavior, it may block http request until it loaded, so it make your page like stop loading if you have slow internet connection.

Which approach that yo have to take is depending on your needs. In this blog, I used both combination. As you see in the bottom, I hardcode post to Delicious, StumbleUpon, and Facebook. And using based on javascript for Reddit, Digg and Tweetmeme.

As the information to Integrate these javascript button, you can visit:

• Integrate: “Digg This” Button
• Put reddit.com buttons on your site
• TweetMeme retweet button

If you want to hardcode it, The Designed has good post about the social media URL pattern that you can use. If you have any thought, put them on comments below.

Search for all occurrences of word under the cursor.

Change word under cursor

Delete everything inside “” string and start insert mode

Quit Insert mode (sometime, faster than ESC)

Reverts the document back to how it was 15 minutes ago. Can take various arguments for the amount of time you want to roll back, and is dependent on undolevels. Can be reversed with the opposite command :later

Indents the block between two braces

Repeat previous command

Accessing windows clipboard buffer

Saves the current buffer if it has been modified

Export current document as HTML formatted

Sort a selection of text or an entire whole file

Builtin buffer explorer

Dump the output of the command into your current document

Perform replace all

Look at your :[command] history

Convert tabs to spaces

There are another super awesome vim tricks that you can read here and here. Also read Vim Recipes that freely available on various formats.

Benefits of watching railscasts, are surely, to improve you coding skills on Ruby on Rails. If you watch other aspects of it, you will find other ‘things’ , that I am sure, useful for you too ;). Below are the other ‘things’:

Zsh

Several episodes of railscasts, I see that Ryan using terminal that has title ‘zsh’ on it. Since I am bash user, I discard zsh for along time. Recently I give zsh a try. At the beginning, zsh look weird for me, but I only need 2 days to be familiar with it. Now my default shell changed from Bash to zsh.

Zsh is cool shell, it is incorporated many of the useful features of bash, ksh, and tcsh into single package. So, this shell is longer to load than others. Read this zsh complete guide to start and hack zsh and you’ll find that this is a wonderful shell.

Monaco font

On railscasts, default editor that used is textmate. If you see deeply, you will find that textmate has a good looking font. Because I am not Mac user, nor textmate user, so I try to googling it. Then I found the answer on stackoverflow. Font used by textmate is named Monaco, and you can download here. Let me repeat it, this is a good looking font, absolutely :D.

Shortcuts.. Shortcuts

Watch an railscasts episode, and you will impress how Ryan used shortcuts well. How he does auto complete on textmate, how he changes multi windows, reloads browser.. what a super time saver!. This behavior reminded me when I was learning how shortcuts on Vim works. Just like type less, do more.

Focus on Specific Area

Unlike another screencasts that cover all of desktop, railscasts using only portion of screen. This technique, I believe to minimize distraction, and keep user focus on right thing. This technique is outside of programming attitude, but can be guidelines if someday I create a screencast ;).

Thanks to Ryan Bates and Railscasts, because of you I find new excitements of how to choose right stuffs, use stuffs effectively, and how to be a better programmer.

This is a long road, and something can change in the future, so just enjoy it!

The most basic of web scraping is copy paste activity. You find useful information, then select, copy, then paste it. This basic technique doesn’t require any programming knowledge. I am sure everyone has done this kind of scraping ;).

But the most interesting part of web scraping is doing it programmatically. Ok, let’s get started. This tutorial using ruby programming language, so the basic knowledge of ruby is recommended, but not required.

For example, I will use a page from 4shared.com that I choose randomly. The purpose of this web scraping is to get direct download link from url below.

http://www.4shared.com/file/87112304/1ea6ef90/FastStone_Image_Viewer.html

Learning web scraping, require analysis to perform the best. As you see above, if you open that url, then you will find the button “Download Now”, and that button points to another url:

http://www.4shared.com/get/87112304/1ea6ef90/FastStone_Image_Viewer.html

Now you understand where you have to start you web scraping process. Instead starting from first url, once you understand how 4shared url scheme, now you realize that you just replace /file/ to /get/ on your url, so you skip one scraping process. Remember, make sure that you minimize unnecessary request to the server.

Now, using second url, the web scraping process started. Here I am using irb to perform live testing, and require open-uri and nokogiri rubygems:

:~ % irb
>> require 'rubygems'
=> true
>> require 'open-uri'
=> true
>> require 'nokogiri'
=> true
>> uri = 'http://www.4shared.com/get/87112304/1ea6ef90/FastStone_Image_Viewer.html'
>> no = Nokogiri::HTML open uri

Now you have full page source on Nokogiri object. Direct download that we find is located on

Direct download wrapped on div element that have id “divDLStart”, we can traverse into it using CSS selector easily, that the reason why I am using Nokogiri ;)

>> no.search("#divDLStart a").attr 'href'
=> "http://dc125.4shared.com/download/87112304/1ea6ef90/FastStone_Image_Viewer.exe?tsid=20090821-013258-a762821d"

Now the direct download link is on your hand, using a simple CSS selector above. Which is translated into words “select element ‘a’ under element that have id ‘divDLStart’, but takes only its ‘href’ attribute“.

Web scraping is a programming task that require you to understand about the target you work with. So dig deeper first then write program code. It’s simple, elegant, powerful and fun!.

Recently, I moved my hosting to Site5. Site5’s hosting features that offer SSH access drive me faster to buy it. After enabled it on Cpanel, then I have a SSH connection parameters on my hands. Just issue this command to connect:

:~ % ssh username@remotehost

Or if you in windows, you can use Putty, a free SSH client.

Then type your password on password prompt, then [ENTER], now you are connected.

Ok, I am sure you have understand that simple mechanism. Now, let me show you how to do passwordless SSH.

On you local computer type:

:~ % ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/username/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/username/.ssh/id_dsa.
Your public key has been saved in /home/username/.ssh/id_dsa.pub.
The key fingerprint is:
59:8e:28:5f:99:55:de:07:11:1e:a8:f9:b9:df:07:ba username@hostname

As you can see above, there are two files that are generated by ssh-keygen command, id_dsa and id_dsa.pub. id_dsa is like private key, and id_dsa.pub is a public key, you can read more detail about Public key cryptography on Wikipedia.

Then, copy id_dsa.pub to Site5, then rename it as authorized_keys in folder .ssh on your home directory. To simplify this process, you can issue this command:

:~ % scp .ssh/id_dsa.pub username@hostname:.ssh/authorized_keys

Above command will transfer id.ssh/_dsa.pub from local computer to .ssh/authorized_keys on remote host.

Congratulations, now you have passwordless SSH connection. If you have any trouble you can read here or you can post it on comments below. See you on next post ;).

One thing that you have to do to make your own domain as your OpenID is just add a little bit html meta tag on your web.

Abracadabra.. now you can using your own domain as your OpenID.

Ok.. I am just kidding about abracadabra.. absolutely there are no magic things behind this process. Technically, this technique is called ‘OpenID Delegation’, a technique to enable your own domain to delegate OpenID request to the OpenID provider.

But wait a minute.. what kind of animal OpenID is?.. Oh.. damn.. I forgot to explain it to you?! basically OpenID is a way to identify yourself to others using a URL rather than username and password. So you don’t have to remember username and password for every single site that support it, just use your OpenID url and you will be enable to register or login easily. Reading more detail on OpenID official website and watch screencast from by Simon Willison will give you good understanding about OpenID.

If you don’t have any OpenID account yet, you can sign up for OpenID. There are a lot of OpenID provider out there, maybe you need this OpenID comparison to decide what is the most suitable for you.

Please share your thoughts about OpenID on comments below.

Previously snippets was saved on native snippet management that built on text editor/IDE. As the internet using becomes larger, now snippets have special places (repository) that have ability to store and share with others. The advantages of putting your snippets on public snippets repository are your snippets will be usable for others, and you also gain benefits from others snippets.

So.. where I have to puts my snippets online? actually there are a lot of web that provide this service. In this post I will cover two of them that I am using frequently. So, check it out.

Gist (Github)

Gist is a snippets service by github, an online project hosting using Git. You can share your snippets without registering, and your snippets will be public accessible. But, I suggest you to register for an account, so you can manage all your snippets, and you will have ability to make your private snippets.

Feature that I love from code snippets repository is its ability to embed snippet into webpage, below is the example of gist embed feature.

Snipt Snipt is another cool service to store your snippets online. The registration is pretty easy, and also you can use your openid. Because Snipt support tagging, you can manage your snippets effectively. I have collected some snippets on my Snipt account, and (I hope) tagged properly. Like Gist, Snipt also support embed feature, check below.

For long list of other repositories, you can check post on Smashing Magazine. Try one by one, or just choose one or more that you feel suitable for your needs. Believe me, this is absolutely useful for you. If you have any comments, feel free to put them below ;)