From: Josh Cheek <josh.cheek@...>
Date: 2010-03-13T06:22:14+09:00
Subject: Hpricot Relative Path

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I'm trying to write a script that pulls out an image from a yfrog page

So this is what I have

require 'rubygems'
require 'hpricot'
require 'open-uri'

url = 'http://yfrog.com/03gssacj'
doc = Hpricot(open(url))

(doc%"#main_image").attributes['src'] # => "/img3/7036/gssac.jpg"

The problem is that the path is relative.
I've done a little googling, queried my ruby and rails ML archives, glanced
at hpricot code, and looked through the method lists for open-uri and
hpricot.
So far, I don't see anything that looks very useful.
Is there a way to have it give me the absolute path so that I can reference
the picture later?

The only thing I've found that works so far involves string manipulation,
which seems like a brittle workaround to replace something that probably
exists if I could just find it.

url       =  'http://yfrog.com/03gssacj'
page      =  open(url)
base      =  page.base_uri.to_s[ /(?:http:\/\/)?[^\/]*\// ]   # => "
http://img3.yfrog.com/"
relative  =  (Hpricot(page)%"#main_image").attributes['src']  # =>
"/img3/7036/gssac.jpg"
absolute  =  URI.join( base , relative )
absolute.to_s # => "http://img3.yfrog.com/img3/7036/gssac.jpg"

Anyone know of a better solution?

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