Is it possible to create new tags in Mako?

Question

New to mako, didn't find in the docs...

One of the stuff I'd like to do with that is:

<%mytag n=12>
blabla ${x}
</%mytag>

which works like the following:

if the X[n] (here, X[12]) variable is an int or string then render the content with x = X[12]
=> With X[12] = 23, it'd render: blabla 23

else if X[n] is a list, then do a for loop, repeating the content for each value of x in X[n]
=> With X[12] = [1, 2, 'bla'], it'd render:

blabla 1
blabla 2
blabla bla

Please try to answer the main question (is it possible to do custom tags?) if possible, before giving advice on how to do what I want to do, thanks :)

Answer 1

The "namespaces" doc seem to describe what you are after, specifically:

Namespaces can also import regular Python functions from modules. These callables need to take at least one argument, context, an instance of Context. A module file some/module.py might contain the callable:

def my_tag(context):
    context.write("hello world")
    return ''

A template can use this module via:

<%namespace name="hw" module="some.module"/>

${hw.my_tag()}

..and:

The "custom tag" format is intended mainly for namespace functions which recognize body content, which in Mako is known as a “def with embedded content”:

<%mynamespace:somefunction arg1="some argument" args="x, y">
    Some record: ${x}, ${y}
</%mynamespace:somefunction>