Why doesn't my Ruby script run when I've moved the code to functions?

I've a simple script which basically reads a RSS script & pushes it to twitter.

The script works fine, except when I move it all to functions and call the functions, it doesn't execute. Why is this so?

Here's what works:

require 'rubygems'
require 'simple-rss'
require 'open-uri'
require 'bitly'
require 'twitter'

def setup_bitly()
   puts "Bitly setup"
   bitly_username = "<user-name>"
   bitly_apikey = "R_<api-key>"
   Bitly.use_api_version_3
   bitly = Bitly.new(bitly_username, bitly_apikey)
end 


def setup_twitter()
  Twitter.configure do |config|
    config.consumer_key = "<key>"
    config.consumer_secret = "<secret>"
    config.oauth_token = "<token>"
    config.oauth_token_secret = "<secret>"
    twitter = Twitter::Client.new
  end
end


bitly = setup_bitly()
twitter = setup_twitter()
url = "http://stackoverflow.com/feeds/tag/ruby"

puts 'Fetching and parsing feed: ' + url.to_s
    rss = SimpleRSS.parse open(url)

    rss.items.reverse.each_with_index do |i,idx|
    u = bitly.shorten(i.link, :history => 1)
    twitter_status = "#{i.开发者_如何学编程title}" 
    puts twitter_status
    twitter.update(twitter_status)

    sleep 10

end

Here's the output:

C:\Users\Sathya\Documents\code\read-feed>read-feed.rb
Fetching and parsing feed: http://stackoverflow.com/feeds/tag/ruby
Dynamic lists in rails 3
Ruby add dynamic events using AASM

If I move the last block to a function, it doesn't execute. By "doesn't execute", I mean, the Ruby interpreter runs & quits, no (error) messages, nothing. Why is this so?

This is the version which is causing problems:

require 'rubygems'
require 'simple-rss'
require 'open-uri'
require 'bitly'
require 'twitter'

def setup_bitly()
   puts "Bitly setup"
   bitly_username = "<username>"
   bitly_apikey = "<api_key>"
   Bitly.use_api_version_3
   bitly = Bitly.new(bitly_username, bitly_apikey)
end 


def setup_twitter()
  Twitter.configure do |config|
    config.consumer_key = "<key>"
    config.consumer_secret = "<secret>"
    config.oauth_token = "<token>"
    config.oauth_token_secret = "<secret>"
    twitter = Twitter::Client.new
  end
end

def do_work()
  url = "http://stackoverflow.com/feeds/tag/ruby"
  puts 'Fetching and parsing feed: ' + url.to_s
  rss = SimpleRSS.parse open(url)
  rss.items.reverse.each_with_index do |i,idx|
    u = bitly.shorten(i.link, :history => 1)
    twitter_status = "#{i.title}"
    puts twitter_status
    twitter.update(twitter_status)
    sleep 10
end

bitly = setup_bitly()
twitter = setup_twitter()
do_work()

end

If I run this, the script runs & quits:

C:\Users\Sathya\Documents\code\read-feed>read-feed.rb

I'm running on Windows 7 64-bit on Ruby 1.9.2p290

This is perfectly normal, your function doesn't see the variables bitly and twitter.

You can do one the following:

• Pass them as arguments to your function.
• Wrap the function in a class and use @instance variables.
• Use global variables (please do not :) )

Are you sure this runs quietly without errors? There are at least 2 problems with the code as is:

1. You are calling twitter.update in do_work without having a local variable called twitter in scope. Same goes for bitly.

2. There's an extra end in the last line.