Ruby script error - ruby

Question

I've got a ruby script
#!/usr/bin/ruby
require 'rubygems'
require 'mechanize'
require 'nokogiri'
require 'highline/import'
require 'stringio'
#Change based on Semester
$term = '09'
$year = '2012'
$frequency = 4 #Number of Seconds between check requests
$agent = Mechanize.new
$agent.redirect_ok = true
$agent.user_agent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.11 Safari/535.19"
$agent.verify_mode = OpenSSL::SSL::VERIFY_NONE
#Uber simway to colorize outputin
class String
def color(c)
colors = {
:black => 30,
:red => 31,
:green => 32,
:yellow => 33,
:blue => 34,
:magenta => 35,
:cyan => 36,
:white => 37
}
return "\e[#{colors[c] || c}m#{self}\e[0m"
end
end
#Logins, Gets the Courses, Returns Courses Obj with Name/URL/Tools for each
def login(username, password)
#Login to the system!
page = $agent.get("https://auth.vt.edu/login?service=https://webapps.banner.vt.edu/banner-cas-prod/authorized/banner/SelfService")
login = page.forms.first
login.set_fields({
:username => username,
:password => password
})
if (login.submit().body.match(/Invalid username or password/)) then
return false
else
return true
end
end
#Gets Course Information
def getCourse(crn)
begin
courseDetails = Nokogiri::HTML( $agent.get(
"https://banweb.banner.vt.edu/ssb/prod/HZSKVTSC.P_ProcComments?CRN=#{crn}&TERM=#{$term}&YEAR=#{$year}"
).body)
rescue
return false #Failed to get course
end
#Flatten table to make it easier to work with
course = {}
dataSet = false
course[:title] = courseDetails.css('td.title').last.text.gsub(/-\ +/, '')
course[:crn] = crn
courseDetails.css('table table tr').each_with_index do |row|
#If we have a dataSet
case dataSet
when :rowA
[ :i, :days, :end, :begin, :end, :exam].each_with_index do |el, i|
if row.css('td')[i] then
course[el] = row.css('td')[i].text
end
end
when :rowB
[ :instructor, :type, :status, :seats, :capacity ].each_with_index do |el, i|
course[el] = row.css('td')[i].text
end
end
dataSet = false
#Is there a dataset?
row.css('td').each do |cell|
case cell.text
when "Days"
dataSet = :rowA
when "Instructor"
dataSet = :rowB
end
end
end
return course
end
#Registers you for the given CRN, returns true if successful, false if not
def registerCrn(crn)
#Follow Path
$agent.get("https://banweb.banner.vt.edu/ssb/prod/twbkwbis.P_GenMenu?name=bmenu.P_MainMnu")
reg = $agent.get("https://banweb.banner.vt.edu/ssb/prod/hzskstat.P_DispRegStatPage")
dropAdd = reg.link_with(:href => "/ssb/prod/bwskfreg.P_AddDropCrse?term_in=#{$year}#{$term}").click
#Fill in CRN Box and Submit
crnEntry = dropAdd.form_with(:action => '/ssb/prod/bwckcoms.P_Regs')
crnEntry.fields_with(:id => 'crn_id1').first.value = crn
crnEntry['CRN_IN'] = crn
add = crnEntry.submit(crnEntry.button_with(:value => 'Submit Changes')).body
if add =~ /#{crn}/ && !(add =~ /Registration Errors/) then
return true
else
return false
end
end
#Main loop that checks the availaibility of each courses and fires to registerCrn on availaibility
def checkCourses(courses)
requestCount = 0
startTime = Time.new
loop do
system("clear")
requestCount += 1
nowTime = Time.new
puts "Checking Availaibility of CRNs".color(:yellow)
puts "--------------------------------\n"
puts "Started:\t#{startTime.asctime}".color(:magenta)
puts "Now: \t#{nowTime.asctime}".color(:cyan)
puts "Request:\t#{requestCount} (Once every #{$frequency} seconds)".color(:green)
puts "--------------------------------\n\n"
courses.each_with_index do |c, i|
puts "#{c[:crn]} - #{c[:title]}".color(:blue)
course = getCourse(c[:crn])
next unless course #If throws error
puts "Availaibility: #{course[:seats]} / #{course[:capacity]}".color(:red)
if (course[:seats] =~ /Full/) then
else
if (registerCrn(c[:crn])) then
puts "CRN #{c[:crn]} Registration Sucessfull"
courses.slice!(i)
else
puts "Couldn't Register"
end
end
print "\n"
end
sleep $frequency
end
end
#Add courses to be checked
def addCourses
crns = []
loop do
system("clear")
puts "Your CRNs:".color(:red)
crns.each do |crn|
puts " -> #{crn[:title]} (CRN: #{crn[:crn]})".color(:magenta)
end
#Prompt for CRN
alt = (crns.length > 0) ? " (or just type 'start') " : " "
input = ask("\nEnter a CRN to add it#{alt}".color(:green) + ":: ") { |q| q.echo = true }
#Validate CRN to be 5 Digits
if (input =~ /^\d{5}$/) then
#Display CRN Info
c = getCourse(input.to_s)
puts "\nCourse: #{c[:title]} - #{c[:crn]}".color(:red)
puts "--> Time: #{c[:begin]}-#{c[:end]} on #{c[:days]}".color(:cyan)
puts "--> Teacher: #{c[:instructor]}".color(:cyan)
puts "--> Type: #{c[:type]} || Status: #{c[:status]}".color(:cyan)
puts "--> Availability: #{c[:seats]} / #{c[:capacity]}\n".color(:cyan)
#Add Class Prompt
add = ask("Add This Class? (yes/no)".color(:yellow) + ":: ") { |q| q.echo = true }
crns.push(c) if (add =~ /yes/)
elsif (input == "start") then
checkCourses(crns)
end
end
end
def main
system("clear")
puts "Welcome to CourseAdd by mil".color(:blue)
username = ask("PID ".color(:green) + ":: ") { |q| q.echo = true }
password = ask("Password ".color(:green) + ":: " ) { |q| q.echo = "*" }
system("clear")
if login(username, password) then
addCourses
else
puts "Invalid PID/Password"
exit
end
end
main
but when I run ruby Untitled.rb it give me this error.
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- mechanize (LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
from /Users/user/Desktop/Untitled.rb:3
What does this mean and how can I fix it? I'm not sure if I need to be doing this through an IDE or if terminal works. I'm brand new to ruby so I honestly have not a clue what the issue could be.

Answer 1

You need to install mechanize. In your terminal, type:
gem install mechanize
Retry your script when it finishes installing. If you have other gems that are missing, you can use the same command to install them.
gem install <gem name>