Module: Puppet::Util::Diff
Overview
Provide a diff between two strings.
Constant Summary
Constants included from Execution
Class Method Summary collapse
Instance Method Summary collapse
-
#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.
- #string_file_diff(path, string) ⇒ Object
Methods included from Execution
execfail, execpipe, execute, ruby_path
Class Method Details
.diff(old, new) ⇒ Object
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# File 'lib/puppet/util/diff.rb', line 8 def diff(old, new) return '' unless diff_cmd = Puppet[:diff] and diff_cmd != "" command = [diff_cmd] if args = Puppet[:diff_args] and 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 26 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 70 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 |