# File lib/nanoc/cli/commands/compile.rb, line 111 def diff_strings(a, b) require 'open3' # Create files Tempfile.open('old') do |old_file| Tempfile.open('new') do |new_file| # Write files old_file.write(a) old_file.flush new_file.write(b) new_file.flush # Diff cmd = [ 'diff', '-u', old_file.path, new_file.path ] Open3.popen3(*cmd) do |stdin, stdout, stderr| result = stdout.read return (result == '' ? nil : result) end end end rescue Errno::ENOENT warn 'Failed to run `diff`, so no diff with the previously compiled ' \ 'content will be available.' nil end