[development] Switching themes in modules

[Moshe Weitzman]

Nedjo Rogers wrote:
>> @all - the right way to add a custom stylesheet from a module is 
>> theme_add_style().
> 
> TDobes offers convincing arguments that we should instead use
> 
> <?php
> // Modules should do:
> drupal_set_html_head(theme('stylesheet_import', base_path() . 
> drupal_get_path('module', 'mymodule') .'/mymodule.css'));
> ?>
> 
> see http://drupal.org/node/52508#comment-79259

well, i have two minor objections to this
- theme_stylesheet_import is not intended as a themeable function. you 
should call it directly, not indirectly through theme(). the problem with 
calling through theme() is that you initialize the theme layer which should 
be done at the latest possible stage. doing it in hook_menu() hurts theme 
switching based on organic group., sections, path, taxonomy, etc.
- it is wordy compared to just theme_add_style(). presumably that could be 
fixed with another theme function or reworking existing ones