How to avoid repetitive filter specification in mako %def's?

Question

I find myself repeating the same filter attribute over all the %def's in my mako code:

<%def name="mydef1(a,b)" filter="trim">
# something something something
</%def>

... 

<%def name="mydef2(b)" filter="trim">
# something something something
</%def>

Is there a way to specify a default set of filters for all %def's and avoid the repetitive 'filter="trim"' in my code?

I noticed there is an option to specify default filters for expression filters, but i could not find something similar for %def's.

There is option called [`buffer_filters`](http://docs.makotemplates.org/en/latest/usage.html#mako.template.Template.params.buffer_filters), which is able to specify default filters for the `%def`'s. However it works only for `%def`'s defined with `buffered="True"`. I think the best solution is to raise issue in the [Mako's repository](https://bitbucket.org/zzzeek/mako/issues) and ask for adding this functionality. Or you always can monkey patch the `DefTag` class to add filter to every `%def` >. — Yaroslav Admin, Jul 24 '15 at 22:50

score 2 · Answer 1 · answered Aug 24 '15 at 20:52

There are a couple workarounds you can use:

You can use the default_filters argument if you are okay importing the defs programmatically or by loading them from a file.
You can nest the defs within a parent def, and apply the filtering to the parent def (I don't have mako on my current machine, so I can't text this, but I am 99% sure this works, please call me out if I am wrong.)
```
<%def name="filterdefs()" filter="trim">

    <%def name="mydef1(a,b)">
    # something something something
    </%def>

    <%def name="mydef2(b)">
    # something something something
    </%def>

</def>
```
Finally, you could use buffer_filters as suggested in the comments. However, instead of adding buffered="True" you can just call the def with capture(myDef) instead of myDef()

How to avoid repetitive filter specification in mako %def's?

1 Answers1