Weird action of 'nokogiri' library on Snow Leopard

Ruby
1

cut the introduction… here is my situation on the snow leopard.

$ cat d.rb
require ‘nokogiri’

$ ruby d.rb
d.rb:1:in `require’: no such file to load – nokogiri (LoadError)
from d.rb:1

$ irb

require ‘nokogiri’
=> true

quit

I can just execute and load ‘nokogiri’ library only on irb not A
source.

what’s problems on my situation?

any helps?

2

On Fri, Feb 5, 2010 at 10:35 AM, junyoung [email protected] wrote:

I can just execute and load ‘nokogiri’ library only on irb not A
source.

what’s problems on my situation?

Most likely because you do not require rubygems in your script. Snow
Leopard’s default irbrc (in /etc/irbrc) takes care of that for you.

Add a “require ‘rubygems’” above your “require ‘nokogiri’” and you
should be fine.,

Ben

3

On 2¿ù6ÀÏ, ¿ÀÀü3½Ã43ºÐ, Ben B. [email protected] wrote:

Add a “require ‘rubygems’” above your “require ‘nokogiri’” and you
should be fine.,

Ben

Okay ben, thanks for your replay.

it makes my script working. but, I am still wondering why it didn’t
work.

I installed the library by using gems. why I have to load ‘rubygems’
library also before calling ‘nokogiri’??

4

2010/2/5 Jun Y. [email protected]:

it makes my script working. but, I am still wondering why it didn’t
work.

I installed the library by using gems. why I have to load ‘rubygems’
library also before calling ‘nokogiri’??

Because that is how it works :slight_smile:

RubyGems is a packaging system. It works by manipulating Ruby’s load
path to include the lib directories of any gems you have installed…
but to make that work, you must include RubyGems in your script.
Starting with Ruby 1.9, RubyGems is built-in to Ruby, so you won’t
need to do that any more, but while you’re using Ruby 1.8, you’ll need
to require rubygems whenever you want to use a gem.

As an alternative, you can set the environment variable RUBYOPT to
‘rubygems’:

[11:24:29] ben@folio (master)
~ $ cat d.rb
require ‘nokogiri’
puts “nokogiri loaded successfully”

[11:24:34] ben@folio (master)
~ $ ruby d.rb
d.rb:1:in `require’: no such file to load – nokogiri (LoadError)
from d.rb:1

[11:24:36] ben@folio (master)
~ $ export RUBYOPT=“rubygems”

[11:24:42] ben@folio (master)
~ $ ruby d.rb
nokogiri loaded successfully

5

On 2¿ù6ÀÏ, ¿ÀÀü4½Ã25ºÐ, Ben B. [email protected] wrote:

RubyGems is a packaging system. It works by manipulating Ruby’s load
require ‘nokogiri’
[11:24:42] ben@folio (master)
~ $ ruby d.rb
nokogiri loaded successfully

you make me clear, ben.
thanks :slight_smile:

6

On Fri, Feb 5, 2010 at 10:35 AM, junyoung [email protected] wrote:

$ cat d.rb

require ‘rubygems’ # missing this :slight_smile:

7

May i seek your help for captioned case ?
I am test the script named test.rb by command “ruby test.rb” and it
pass.
Then i converte it as rake task.
The rake task pass on rails 2.3.5 but fail on rails 3 beta4 with error
msg:
“no such file to load – nokogiri”

============================
env ：rails 3 beta4, ruby 1.8.7, ubuntu

test.rb

require ‘rubygems’
require ‘nokogiri’
require ‘open-uri’
require “iconv”

url = “http://www.bugutang.com”
doc = Nokogiri::HTML(open(url))
doc.css(“title”).each do |c|
puts Iconv.iconv(“GBK//IGNORE”, “UTF-8//IGNORE”, c.content)

end

============================
claw.rake

desc "Fetch product "
task :claw => :environment do
require ‘rubygems’
require ‘nokogiri’
require ‘open-uri’
require “iconv”

url = “http://www.bugutang.com”
doc = Nokogiri::HTML(open(url))
doc.css(“title”).each do |c|
puts Iconv.iconv(“GBK//IGNORE”, “UTF-8//IGNORE”, c.content)

end

end

here is the environment :
RubyGems Environment:

  • RUBYGEMS VERSION: 1.3.7
  • RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux]
  • INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8
  • RUBY EXECUTABLE: /usr/bin/ruby1.8
  • EXECUTABLE DIRECTORY: /usr/bin
  • RUBYGEMS PLATFORMS:
    • ruby
    • x86_64-linux
  • GEM PATHS:
    • /usr/lib/ruby/gems/1.8
    • /home/bugu/.gem/ruby/1.8
  • GEM CONFIGURATION:
    • :update_sources => true
    • :verbose => true
    • :benchmark => false
    • :backtrace => false
    • :bulk_threshold => 1000
  • REMOTE SOURCES:

nokogiri (1.4.2)
Authors: Aaron P., Mike D.
Rubyforge: http://rubyforge.org/projects/nokogiri
Homepage: http://nokogiri.org
Installed at: /usr/lib/ruby/gems/1.8

Any help ?

Ben B. wrote:

2010/2/5 Jun Y. [email protected]:

it makes my script working. but, I am still wondering why it didn’t
work.

I installed the library by using gems. why I have to load ‘rubygems’
library also before calling ‘nokogiri’??

Because that is how it works :slight_smile:

RubyGems is a packaging system. It works by manipulating Ruby’s load
path to include the lib directories of any gems you have installed…
but to make that work, you must include RubyGems in your script.
Starting with Ruby 1.9, RubyGems is built-in to Ruby, so you won’t
need to do that any more, but while you’re using Ruby 1.8, you’ll need
to require rubygems whenever you want to use a gem.

As an alternative, you can set the environment variable RUBYOPT to
‘rubygems’:

[11:24:29] ben@folio (master)
~ $ cat d.rb
require ‘nokogiri’
puts “nokogiri loaded successfully”

[11:24:34] ben@folio (master)
~ $ ruby d.rb
d.rb:1:in `require’: no such file to load – nokogiri (LoadError)
from d.rb:1

[11:24:36] ben@folio (master)
~ $ export RUBYOPT=“rubygems”

[11:24:42] ben@folio (master)
~ $ ruby d.rb
nokogiri loaded successfully