Perfect Script (ruby)

a template for a clean ruby script.

Notes

open3 seems like the right way to execute commands and get exitcode and output
logging is sometimes too much for a script, but decided to showcase it anyway. verbose is nice to have.
ostruct is ugly, unless you do javascript.
primary goal of making the meat of a script reusable achieved with wrapping list_files! in a module
python gains points due to being able import functions from scripts
prefer to not use inheritance and a mixin in a simple script. because ruby.
python style exit(main!) seemed reasonable