mapfunc Ansible Filter Plugin

mapfunc.py

#!/usr/bin/env python
class FilterModule(object):
    def filters(self):
        return {
            'mapfunc': self.mapfunc,
            'applyfunc': self.applyfunc,
        }

    def mapfunc(self, items, func_expr_str, *static_args, **static_kwargs):
        """Map a Python function over all the inputs.

        For example,  {{ ["a", "b"] | mapfunc("lambda x: x.upper()") }}
            produces  ["A", "B"]

        Positional and keyword arguments passed to the filter will propagate to each iteration:
            {{ ["a", "b"] | mapfunc("lambda x, replace: replace", replace="X") }}
        produces
            ["X", "X"]
        """
        func = eval(func_expr_str, {}, {})
        return (func(x, *static_args, **static_kwargs) for x in items)

    def applyfunc(self, item, func_expr_str, *static_args, **static_kwargs):
        """
        Apply a Python function to the input.

        For example,  {{ ["c", "d"] | applyfunc("lambda xs: map(str.upper, xs)") }}
           produces   ["C", "D"]

        Positional and keyword arguments passed to the filter will be passed as arguments to the function:
            {{ ["a", "b"] | applyfunc("lambda x, replace: replace", replace="X") }}
        produces
            "X"
        """
        func = eval(func_expr_str, {}, {})
        return func(item, *static_args, **static_kwargs)

To use: Save this file in a folder called filter_plugins sibling to your playbooks.