Class: CheckFiles::Checker

Inherits:
Object
  • Object
show all
Defined in:
lib/check_files/checker.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pattern) ⇒ Checker

Returns a new instance of Checker.



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# File 'lib/check_files/checker.rb', line 5

def initialize(pattern)
  @pattern = pattern
  pattern_digest = Digest::SHA1.hexdigest(pattern)
  @cache_path = Rails.root.join("tmp/cache/#{pattern_digest}")
end

Instance Attribute Details

#cache_path ⇒ Object (readonly)

Returns the value of attribute cache_path.



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# File 'lib/check_files/checker.rb', line 3

def cache_path
  @cache_path
end

#pattern ⇒ Object (readonly)

Returns the value of attribute pattern.



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# File 'lib/check_files/checker.rb', line 3

def pattern
  @pattern
end

Instance Method Details

#changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/check_files/checker.rb', line 27

def changed?
  prev_digest = previous_digest

  if prev_digest
    prev_digest != current_digest
  else
    update_cache && false
  end
end

#compute_digest(entry) ⇒ Object 



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# File 'lib/check_files/checker.rb', line 41

def compute_digest(entry)
  content = File.exist?(entry) && File.read(entry)
  Digest::SHA1.hexdigest("#{entry}-#{content}")
end

#current_digest ⇒ Object 



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# File 'lib/check_files/checker.rb', line 11

def current_digest
  entries = Dir[pattern].sort
  entries_digest = Digest::SHA1.hexdigest(entries.join)

  if pattern.end_with?("/*")
    entries_digest
  else
    content_digest = entries.map {|entry| compute_digest(entry) }.join
    Digest::SHA1.hexdigest("#{entries_digest}#{content_digest}")
  end
end

#previous_digest ⇒ Object 



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# File 'lib/check_files/checker.rb', line 23

def previous_digest
  cache_path.file? && cache_path.read
end

#update_cache ⇒ Object 



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# File 'lib/check_files/checker.rb', line 37

def update_cache
  File.open(cache_path, "w") {|f| f << current_digest }
end