As far as I can tell, it's not possible for a theme to add a preprocessor for template_preprocess_calendar. There is no template called calendar.tpl, so strictly speaking it's a helper function and not a preprocessor. This should be renamed to save themers banging their heads on the desk ;)

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AaronBauman’s picture

AaronBauman
he/him
CreditAttribution: AaronBauman commented

just ran into this myself.
#1966816: template_preprocess_calendar is not actually a preprocess implementation

template_preprocess_calendar() is called directly a number of times.
there's no way to override it with a hook_preprocess_* function.
there's no implementation of theme_calendar() for which this preprocessor function would even be called.
the naming of this function is misleading and confusing.

(at least) two possible solutions:
* implement theme_calendar() so that this function actually makes sense
* rename template_preprocess_calendar(), removing "template" and "preprocess"

apaderno’s picture

apaderno
he/him
Primary language Italian
Location Brescia, 🇮🇹 🇪🇺
CreditAttribution: apaderno as a volunteer commented
Issue summary: View changes
Status: Active » Closed (outdated)

I am closing this issue, since it's for a Drupal version no longer supported.