Rails - Dec 2005 - Diffing paragraphs

Hi all,

Is there a decent equivalent of Perl''s Text::ParagraphDiff[1] that I
can
use with Rails to show differences between two versions of a story?

I''ve found something called xhtmldiff, but it requires funky REXML
objects that I can''t get to play nice with simple_format().  The diff
algorithm that comes with Instiki is nice, but it doesn''t seem to scale
(works okay on 500 characters, appears to hang > 1000, which is still
rather short).

--
Marshall Roch

[1]
http://search.cpan.org/~jryan/Text-ParagraphDiff-2.70/lib/Text/ParagraphDiff.pm

there is an htmldiff module that comes with spark that may work for you.

http://rubyforge.org/frs/?group_id=418


Marshall Roch wrote:
> Hi all,
> 
> Is there a decent equivalent of Perl''s Text::ParagraphDiff[1] that
I can
> use with Rails to show differences between two versions of a story?
> 
> I''ve found something called xhtmldiff, but it requires funky REXML
> objects that I can''t get to play nice with simple_format().  The
diff
> algorithm that comes with Instiki is nice, but it doesn''t seem to
scale
> (works okay on 500 characters, appears to hang > 1000, which is still
> rather short).
> 
> -- 
> Marshall Roch
> 
> [1]
>
http://search.cpan.org/~jryan/Text-ParagraphDiff-2.70/lib/Text/ParagraphDiff.pm
>

On Sun, 4 Dec 2005, Marshall Roch wrote:
> Hi all,
>
> Is there a decent equivalent of Perl''s Text::ParagraphDiff[1] that
I can
> use with Rails to show differences between two versions of a story?
>
> I''ve found something called xhtmldiff, but it requires funky REXML
objects
> that I can''t get to play nice with simple_format().  The diff
algorithm that
> comes with Instiki is nice, but it doesn''t seem to scale (works
okay on 500
> characters, appears to hang > 1000, which is still rather short).
   http://raa.ruby-lang.org/project/docdiff/
   http://raa.ruby-lang.org/project/diff-lcs/
   http://raa.ruby-lang.org/project/algorithm-diff/
   http://raa.ruby-lang.org/project/simple-diff/

however, if performance we''re key you''d have to come up with
an extremely good
reason not to use

   require "tempfile"

   a = Tempfile::new "a#{ rand }"
   b = Tempfile::new "b#{ rand }"

   a.write "some text"
   b.write "some other text"

   a.close
   b.close

   diff = ` diff -bBu #{ a.path } #{ b.path } `

   a.close!
   b.close!

regards.

-a
-- 
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