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diff.rb README Diff Algorithm Implementation, Copyright (C) 2001 Lars Christensen, firstname.lastname@example.org. LEGAL NOTICE This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ABOUT This implementation is basically a Ruby conversion of the Perl Algorithm::Diff module in CPAN. Diff is an algorithm which computes the differences between two lists a and b. The resulting set of differences can be applied to a (also called "patching") to get b. This is also what the Unix command line tools "diff" and "patch" are able to do. diff.rb generates a "minimal diff". This means that the set of changes that should be applied to a to get b can not be fewer than those generated by diff.rb. diff.rb does not generate contextual diffs. Therefor, the diff can only be succesfully applied to a list exactly equal to to original a. Documentation is in RD format in diff.rb. Ruby rd2 on it to extract into other formats. INSTALLATION You should not installed this library system wide, because it is a work in progress and the API may still change. You should place the file "diff.rb" together with the source that needs to use it and simply put "require 'diff'" at the top of your program file. REVISION HISTORY Version 0.1 Initial release. Diff algorithm works. Version 0.2 Speed improvements and code clean up Version 0.3 Added unixdiff.rb, an implementation of Unix Diff (simple format only) CREDITS Thanks to authors of Perl's Algorithm::Diff (originally written by Mark-Jason Dominus, currently maintained by Ned Konz).