Module: Puppet::Util::Diff

Includes:
Execution
Included in:
DataSync, FileBucketFile::File
Defined in:
lib/puppet/util/diff.rb

Overview

Provide a diff between two strings.

Constant Summary

Constants included from Execution

Execution::NoOptionsSpecified

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Execution

execpipe, execute, ruby_path

Class Method Details

.diff(old, new) ⇒ Object



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# File 'lib/puppet/util/diff.rb', line 10

def diff(old, new)
  diff_cmd = Puppet[:diff]
  return '' unless diff_cmd && diff_cmd != ""

  command = [diff_cmd]
  args = Puppet[:diff_args]
  if args && args != ""
    args.split(' ').each do|arg|
      command << arg
    end
  end
  command << old << new
  Puppet::Util::Execution.execute(command, :failonfail => false, :combine => false)
end

Instance Method Details

#lcs_diff(data_old, data_new, format = :unified, context_lines = 3) ⇒ Object

return diff string of two input strings format defaults to unified context defaults to 3 lines



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# File 'lib/puppet/util/diff.rb', line 30

def lcs_diff(data_old, data_new, format=:unified, context_lines=3)
  unless Puppet.features.diff?
    Puppet.warning _("Cannot provide diff without the diff/lcs Ruby library")
    return ""
  end
  data_old = data_old.split(/\n/).map! { |e| e.chomp }
  data_new = data_new.split(/\n/).map! { |e| e.chomp }

  output = ''.dup

  diffs = ::Diff::LCS.diff(data_old, data_new)
  return output if diffs.empty?

  oldhunk = hunk = nil
  file_length_difference = 0

  diffs.each do |piece|
    begin
      hunk = ::Diff::LCS::Hunk.new(
        data_old, data_new, piece,
        context_lines,
        file_length_difference)
      file_length_difference = hunk.file_length_difference
      next unless oldhunk

      # Hunks may overlap, which is why we need to be careful when our
      # diff includes lines of context. Otherwise, we might print
      # redundant lines.
      if (context_lines > 0) and hunk.overlaps?(oldhunk)
        hunk.unshift(oldhunk)
      else
        output << oldhunk.diff(format)
      end
    ensure
      oldhunk = hunk
      output << "\n"
    end
  end

  # Handle the last remaining hunk
  output << oldhunk.diff(format) << "\n"
end

#string_file_diff(path, string) ⇒ Object



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# File 'lib/puppet/util/diff.rb', line 73

def string_file_diff(path, string)
  tempfile = Tempfile.new("puppet-diffing")
  tempfile.open
  tempfile.print string
  tempfile.close
  notice "\n" + diff(path, tempfile.path)
  tempfile.delete
end