index.rb

require 'rubygems'
require 'dm-core'
require 'dm-more'
require 'stemmer'
require 'robots'
require 'open-uri'
require 'hpricot'

DataMapper.setup(:default, 'mysql://root:root@localhost/saush')
FRESHNESS_POLICY = 60 * 60 * 24 * 7 # 7 days

class Page
  include DataMapper::Resource

  property :id,          Serial
  property :url,         String, :length => 255
  property :title,       String, :length => 255
  has n, :locations
  has n, :words, :through => :locations
  property :created_at,  DateTime
  property :updated_at,  DateTime  
  
  def self.find(url)
    page = first(:url => url)
    page = new(:url => url) if page.nil?
    return page
  end

  def refresh
    update_attributes({:updated_at => DateTime.parse(Time.now.to_s)})
  end
  
  def age
    (Time.now - updated_at.to_time)/60
  end

  def fresh?
    age > FRESHNESS_POLICY ? false : true 
  end
end

class Word
  include DataMapper::Resource

  property :id,         Serial
  property :stem,       String
  has n, :locations
  has n, :pages, :through => :locations

  def self.find(word)
    wrd = first(:stem => word)
    wrd = new(:stem => word) if wrd.nil?
    return wrd
  end
end

class Location
  include DataMapper::Resource

  property :id,         Serial
  property :position,   Integer

  belongs_to :word
  belongs_to :page
end

class String
  def words
    words = self.gsub(/[^\w\s]/,"").split
    d = []
    words.each { |word| d << word.downcase.stem unless (COMMON_WORDS.include?(word) or word.size > 50) }
    return d
  end

  COMMON_WORDS = ['a','able','about','above','abroad','according','accordingly','across','actually','adj','after','afterwards','again','against','ago','ahead','aint','all','allow','allows','almost','alone','along','alongside','already','also','although','always','am','amid','amidst','among','amongst','an','and','another','any','anybody','anyhow','anyone','anything','anyway','anyways','anywhere','apart','appear','appreciate','appropriate','are','arent','around','as','as','aside','ask','asking','associated','at','available','away','awfully','b','back','backward','backwards','be','became','because','become','becomes','becoming','been','before','beforehand','begin','behind','being','believe','below','beside','besides','best','better','between','beyond','both','brief','but','by','c','came','can','cannot','cant','cant','caption','cause','causes','certain','certainly','changes','clearly','cmon','co','co.','com','come','comes','concerning','consequently','consider','considering','contain','containing','contains','corresponding','could','couldnt','course','cs','currently','d','dare','darent','definitely','described','despite','did','didnt','different','directly','do','does','doesnt','doing','done','dont','down','downwards','during','e','each','edu','eg','eight','eighty','either','else','elsewhere','end','ending','enough','entirely','especially','et','etc','even','ever','evermore','every','everybody','everyone','everything','everywhere','ex','exactly','example','except','f','fairly','far','farther','few','fewer','fifth','first','five','followed','following','follows','for','forever','former','formerly','forth','forward','found','four','from','further','furthermore','g','get','gets','getting','given','gives','go','goes','going','gone','got','gotten','greetings','h','had','hadnt','half','happens','hardly','has','hasnt','have','havent','having','he','hed','hell','hello','help','hence','her','here','hereafter','hereby','herein','heres','hereupon','hers','herself','hes','hi','him','himself','his','hither','hopefully','how','howbeit','however','hundred','i','id','ie','if','ignored','ill','im','immediate','in','inasmuch','inc','inc.','indeed','indicate','indicated','indicates','inner','inside','insofar','instead','into','inward','is','isnt','it','itd','itll','its','its','itself','ive','j','just','k','keep','keeps','kept','know','known','knows','l','last','lately','later','latter','latterly','least','less','lest','let','lets','like','liked','likely','likewise','little','look','looking','looks','low','lower','ltd','m','made','mainly','make','makes','many','may','maybe','maynt','me','mean','meantime','meanwhile','merely','might','mightnt','mine','minus','miss','more','moreover','most','mostly','mr','mrs','much','must','mustnt','my','myself','n','name','namely','nd','near','nearly','necessary','need','neednt','needs','neither','never','neverf','neverless','nevertheless','new','next','nine','ninety','no','nobody','non','none','nonetheless','noone','no-one','nor','normally','not','nothing','notwithstanding','novel','now','nowhere','o','obviously','of','off','often','oh','ok','okay','old','on','once','one','ones','ones','only','onto','opposite','or','other','others','otherwise','ought','oughtnt','our','ours','ourselves','out','outside','over','overall','own','p','particular','particularly','past','per','perhaps','placed','please','plus','possible','presumably','probably','provided','provides','q','que','quite','qv','r','rather','rd','re','really','reasonably','recent','recently','regarding','regardless','regards','relatively','respectively','right','round','s','said','same','saw','say','saying','says','second','secondly','see','seeing','seem','seemed','seeming','seems','seen','self','selves','sensible','sent','serious','seriously','seven','several','shall','shant','she','shed','shell','shes','should','shouldnt','since','six','so','some','somebody','someday','somehow','someone','something','sometime','sometimes','somewhat','somewhere','soon','sorry','specified','specify','specifying','still','sub','such','sup','sure','t','take','taken','taking','tell','tends','th','than','thank','thanks','thanx','that','thatll','thats','thats','thatve','the','their','theirs','them','themselves','then','thence','there','thereafter','thereby','thered','therefore','therein','therell','therere','theres','theres','thereupon','thereve','these','they','theyd','theyll','theyre','theyve','thing','things','think','third','thirty','this','thorough','thoroughly','those','though','three','through','throughout','thru','thus','till','to','together','too','took','toward','towards','tried','tries','truly','try','trying','ts','twice','two','u','un','under','underneath','undoing','unfortunately','unless','unlike','unlikely','until','unto','up','upon','upwards','us','use','used','useful','uses','using','usually','v','value','various','versus','very','via','viz','vs','w','want','wants','was','wasnt','way','we','wed','welcome','well','well','went','were','were','werent','weve','what','whatever','whatll','whats','whatve','when','whence','whenever','where','whereafter','whereas','whereby','wherein','wheres','whereupon','wherever','whether','which','whichever','while','whilst','whither','who','whod','whoever','whole','wholl','whom','whomever','whos','whose','why','will','willing','wish','with','within','without','wonder','wont','would','wouldnt','x','y','yes','yet','you','youd','youll','your','youre','yours','yourself','yourselves','youve','z','zero']  
end

DataMapper.auto_migrate! if ARGV[0] == 'reset'