Wanted: PHP Implementation of Unified Diff

Sebastian Bergmann » 28 July 2007 » in PHPUnit » 9 Comments

For PHPUnit I need a PHP function (written in PHP, an extension would not solve the problem) that
  • takes two strings as its input and
  • returns a string with the differences between the two string in the same format as GNU diff would return for diff -u for two files that contain the respective strings.

    Currently I rely on GNU diff being installed on the system that PHPUnit runs on. This thread on the PHPUnit mailinglist shows that this poses a problem.

    I know that there is a Text_Diff package in PEAR but it does way more than I need.
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9 Comments to "Wanted: PHP Implementation of Unified Diff"

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  1. moshe Weitzman
    28/07/2007 at 14:06 Permalink
    drupal's diff module uses some code developed for phpwiki. see http://cvs.drupal.org/viewvc.py/drupal/contributions/modules/diff/DiffEngine.php

    Reply

  2. Sebastian
    28/07/2007 at 15:46 Permalink
    Any preferred license?

    Reply

  3. Sebastian Bergmann
    28/07/2007 at 16:27 Permalink
    BSD License

    Reply

  4. Jan Schneider
    28/07/2007 at 19:04 Permalink
    Why don't pick the pieces from Text_Diff that you need, if the whole package offers too much for you?

    Reply

  5. Sebastian Bergmann
    28/07/2007 at 19:43 Permalink
    Can I take the pieces I need and add them to the PHPUnit codebase (while keeping authorship/copyright information)? Are the LGPL and BSD License compatible for this?

    Reply

  6. ensi
    30/07/2007 at 09:28 Permalink
    Maybe this will do the job?

    http://www.holomind.de/phpnet/diff2.src.php

    Reply

  7. Clay Loveless
    30/07/2007 at 20:07 Permalink
    @ensi: GPL != BSD

    @Sebastian: Glad you posted this request. I'm interested in the same thing.

    Reply

  8. Justin Patrin
    30/07/2007 at 22:03 Permalink
    What is wrong with Text_Diff? It has a unified diff renderer that works just fine. Any diff code would have to do the same general workt hat Text_Diff does to find the diffs and then render into your preferred format.

    Reply

  9. Schmalls
    01/08/2007 at 04:09 Permalink
    I put together a BSD diff and patch function and posted it here: http://pastebin.com/f145611b3

    I haven't tested how fast it is (probably slow right now), and it doesn't print a unified diff (but that shouldn't be too hard to implement) but prints out a modified original diff for space efficiency.

    Reply

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