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# frozen_string_literal: true
require 'tempfile'
# Provide a diff between two strings.
module Puppet::Util::Diff
include Puppet::Util::Execution
require 'tempfile'
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
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!(&:chomp)
data_new = data_new.split(/\n/).map!(&: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|
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
# Handle the last remaining hunk
output << oldhunk.diff(format) << "\n"
end
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
end
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