Monday, September 29, 2008

Somebody knows Shoes

I'm a fairly late adopter compared to some of you. When Shoes came out, I had followed it, but never tried it. It's been at least 8 months now, and I finally got around to it. I guess I don't really try something out unless I have a use for it in my mind. Still waiting for that Haskell project...

Anyway, trying out Shoes was...easy. Outside of compiling it, actually. I take that back. Once I read the README and figured out what packages I needed, it was easy. Even easier when I found the executables. Running the sample code was...easy. And trying out your own guessed it...even easier. It helps that there's a ton of examples and documentation. Makes me think that when programming, you should keep the API of your code in mind, so that it's easy to use after you've implemented it.

Two things strike me immediately. _why took his ability to make DSL in Ruby to heart. I don't have to think about the buffering, cursor positions, etc. Even better, the functions are orthogonal and consistent.

You can not only move shapes around to follow your mouse, but also widgets, like buttons. => 300, :height => 300 do
background snow
@o = stack do
button("Message") { alert("Sent!") }

motion do |x,y|
@o.move width - x, height - y

Motion gets executed whenever your mouse moves around on the Shoes screen. So you can have a button dancing opposite to your mouse. Another surprising thing is that an app is structured like a webpage, and different pages have urls. And routing is declared in the app block itself! And not only that, it takes regexs
class Dictionary < Shoes
url '/', :index
url '/(\w+)', :word

def index
stack do
title "Enter a Word"
@word = edit_line
button "OK" do
visit "/#{@word.text}"

def word(string)
stack do
para "No definition found for #{string}. ",
"Sorry this doesn't actually work."

I'm not sure how far this sort of thing can go when building more complex GUIs, but so far, it seems pretty promising. There were a couple things that were broken on Ubuntu, however. I couldn't get margins to work, as well as rounded corners: => 20) do
background red, :radius => 12

Boo. Rounded corners would have been exciting.

Well, try it out and see if you like it. There's lots of neat things people have built with Shoes already.

I, on the other hand, just built a prototype. Nothin to see here folks.

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