ruby - Playing with Scrapi in Rails 3.. getting Segmentation Fault error / Abort Trap -

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what i've done far..

sudo gem install scrapi  sudo gem install tidy

this didn't work because didn't have libtidy.dylib

so did :

sudo port install tidy  sudo cp libtidy.dylib /library/ruby/gems/1.8/gems/scrapi-1.2.0/lib/tidy/libtidy.dylib

then started following simple railscast @ : http://media.railscasts.com/videos/173_screen_scraping_with_scrapi.mov

right after mr. bates finished first save scrapitest.rb , tried run code :

require 'rubygems' require 'scrapi'  scraper = scraper.define   process "title", :page_name => :text   result :page_name end  uri = uri.parse("http://www.walmart.com/search/search-ng.do?search_query=lost+season+3&ic=48_0&search_constraint=0") p scraper.scrape(uri)

with code : 

ruby scrapitest.rb

and returned error :

/library/ruby/gems/1.8/gems/tidy-1.1.2/lib/tidy/tidybuf.rb:39: [bug] segmentation fault ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]  abort trap

completely out of ideas..

i had issue , follow-up issue seg fault happen non-deterministically.

i followed steps here - http://rubyforge.org/tracker/index.php?func=detail&aid=10007&group_id=435&atid=1744

in tidy-1.1.2/lib/tidy/tidylib.rb:

1. add line 'load' method in tidylib: 
   extern "void tidybufinit(void*)"
2. define new method called 'buf_init' in tidylib: 
   # tidybufinit, using default allocator   #   def buf_init(buf)     tidybufinit(buf)   end

then, in tidy-1.1.2/lib/tidy/tidybuf.rb:

3. add line initialize method of tidybuf below malloc: 
    tidylib.buf_init(@struct)

so looks this:

   # tidybufinit, using default allocator   #   def buf_init(buf)     @struct = tidybuffer.malloc     tidylib.buf_init(@struct)   end
4. completeness, make brennan's change adding allocator field tidybuffer struct looks this: 
   tidybuffer = struct [     "tidyallocator* allocator",     "byte* bp",     "uint size",     "uint allocated",     "uint next"   ]

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