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# Provide a diff between two strings.
module Puppet::Util::Diff
include Puppet::Util
require 'tempfile'
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
module_function :diff
# return diff string of two input strings
# format defaults to unified
# context defaults to 3 lines
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
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
end
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