Class: Reyes::Diff

Inherits:
Object
  • Object
show all
Defined in:
lib/reyes/diff.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Diff

Returns a new instance of Diff.



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# File 'lib/reyes/diff.rb', line 3

def initialize
  @old = Tempfile.new('diff.old.')
  @new = Tempfile.new('diff.new.')
end

Instance Method Details

#diff ⇒ String?

Consumes the Diff, returning the full unified diff of @old and @new

Returns:

  • (String, nil) —

    String diff or nil if the files do not differ



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# File 'lib/reyes/diff.rb', line 10

def diff
  raise "Diff has already been created" unless @old && @new

  [@old, @new].each do |f|
    f.flush
  end

  output = nil
  cmd = ["diff", '-u', @old.path, @new.path]
  status = Subprocess.call(cmd, :stdout => Subprocess::PIPE) do |c|
    output, _ = c.communicate
  end

  case status.exitstatus
  when 0
    # no diff
    return nil
  when 1
    # files differ
    return output
  else
    # trouble
    raise Subprocess::NonZeroExit.new(cmd, status)
  end
ensure
  @old.unlink
  @old = nil
  @new.unlink
  @new = nil
end

#new ⇒ File

Returns a handle to the underlying File for new, allowing the caller to populate it’s contents

Returns:

  • (File) 


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# File 'lib/reyes/diff.rb', line 51

def new
  @new
end

#old ⇒ File

Returns a handle to the underlying File for old, allowing the caller to populate it’s contents

Returns:

  • (File) 


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# File 'lib/reyes/diff.rb', line 44

def old
  @old
end