Yup, 33 bytes

*{{:0e-}-0]~{~|~|0~--e~}0~--#\}1#

Here's the github. Invoke like this:

node yup.js <location>.yup -n <input>

Or

node yup.js -l "*{{:0e-}-0]~{~|~|0~--e~}0~--#\}1#" -n <input>

Examples:

λ node yup.js -l "*{{:0e-}-0]~{~|~|0~--e~}0~--#\}1#" -n 5
120
λ node yup.js examples\factorial.yup -n 0
1

Explanation

To come.