[Zope] Flexible path generation for metal:use-macro with Python (KeyError)

[Dieter Maurer]

Thomas Duebendorfer writes:
 > I am looking for a flexible way to define the path for a macro to be used.
 > 
 > The following works:
 >  <span metal:use-macro="here/content_macro_main.html/macros/main | 
 >      here/content_macros.html/macros/main | 
 >      here/content_macros.html/macros/no_main_content">
 > ....
 > Now, I would like to generate this sequence of alternative paths by a 
 > Python script to have full flexibility. Therefore I tried the following 
 > approach:
 > 
 > Create a Python "getMacroPath" script that takes the parameter "macroname" 
 > and looks like this:
 >  return 'here/content_macro_main.html/macros/' + macroname
Thus, your script returns a string (representing a path expression)
and you want to get the designated object.

The "path" function does this: it take a string and evaluates it
as a path.

Use: "python: path(here.getMacroPath(...))"


Dieter