Module: Wdiff

Defined in:
lib/wdiff.rb

Defined Under Namespace

Modules: Helper

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.bin_path ⇒ Object 



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# File 'lib/wdiff.rb', line 13

def bin_path
  'wdiff'
end

.diff(old_str, new_str, options = {}) ⇒ Object 



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# File 'lib/wdiff.rb', line 37

def diff(old_str, new_str, options={})
  f1, f2 = Tempfile.new('f1'), Tempfile.new('f2')
  f1.write(old_str); f1.flush
  f2.write(new_str); f2.flush
  opt_str = options_string_from_hash(options)
  raw = %x{#{bin_path} #{opt_str} #{f1.path} #{f2.path}}
  f1.close; f2.close
  raw
end

.included(target) ⇒ Object 



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# File 'lib/wdiff.rb', line 4

def included(target)
  verify_wdiff_in_path
end

.options_string_from_hash(options = {}) ⇒ Object

TODO - this will fail if option strings include quotes, need to escape quotes automagically



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# File 'lib/wdiff.rb', line 18

def options_string_from_hash(options={})
  parts = []

  options[:inserts].each_with_index do |token, index|
    token.gsub!(/^\"$/,'\"') if token == '"'
    parts << ( index.even? ?  %Q(--start-insert="#{token}")  :  %Q(--end-insert="#{token}") )
    break if index >= 1
  end if options[:inserts]

  
  options[:deletes].each_with_index do |token, index|
    token.gsub!(/^\"$/,'\"') if token == '"'
    parts << ( index.even? ?  %Q(--start-delete="#{token}")  :  %Q(--end-delete="#{token}") )
    break if index >= 1
  end if options[:deletes]
  
  parts.join(" ")
end

.verify_wdiff_in_path ⇒ Object 



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# File 'lib/wdiff.rb', line 8

def verify_wdiff_in_path
  path = %x{which #{bin_path}}
  raise "GNU wdiff (http://www.gnu.org/software/wdiff/) not found in $PATH" if path.empty?
end

Instance Method Details

#wdiff(str_new, options = {}) ⇒ Object 



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# File 'lib/wdiff.rb', line 48

def wdiff(str_new, options={})
  Wdiff::diff(self, str_new, options)
end