[development] Wizards, multi-part forms, and you

[Jeff Eaton]

Time for some shameless patch pimping for Drupal 4.8/5.0.
 
FormAPI has made lots of things much much easier, but has also made
other things harder. Namely, dynamic forms that are built based on user
input, or that submit to themselves and add additional fields. (building
them is easy, but validation, submission, etc gets incredibly
complicated.)
 
 <http://drupal.org/node/74660> http://drupal.org/node/74660 aims to
simplify that process for modules that need very complex multi-step
forms. It breaks up the currently-monolithic drupal_get_form() function
into bite sized ones like drupal_build_form(), drupal_render_form(), and
so on. drupal_get_form() continues to work as it always has, but modules
in need of complicated multi-step and multi-form processes can sidestep
it completely, using the more granular functions.
 
This has always been possible, but it required copy-and-paste re-use of
almost a hundred lines of code from drupal_get_form. With this patch,
it's easy for those who need it and transparent to those who don't.
 
Reviews from any formapi gurus much appreciated.
 
--Jeff
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