Module: Puppet::Util::Diff

Includes:
Puppet::Util
Defined in:
lib/puppet/util/diff.rb

Overview

Provide a diff between two strings.

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Puppet::Util

activerecord_version, benchmark, chuser, classproxy, #execfail, #execpipe, execute, logmethods, memory, proxy, recmkdir, secure_open, symbolize, symbolizehash, symbolizehash!, synchronize_on, thinmark, #threadlock, which, withumask

Methods included from POSIX

#get_posix_field, #gid, #idfield, #methodbyid, #methodbyname, #search_posix_field, #uid

Class Method Details

.diff(old, new) ⇒ Object 



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# File 'lib/puppet/util/diff.rb', line 6

def diff(old, new)
  command = [Puppet[:diff]]
  if args = Puppet[:diff_args] and args != ""
    command << args
  end
  command << old << new
  execute(command, :failonfail => 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 20

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 = ""

  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 64

def string_file_diff(path, string)
  require 'tempfile'
  tempfile = Tempfile.new("puppet-diffing")
  tempfile.open
  tempfile.print string
  tempfile.close
  print diff(path, tempfile.path)
  tempfile.delete
end