An old-new take on argument parsing in Rust

Extending getopts into a small framework for Unix-style Rust command-line tools. Over the years, I’ve written tens of command-line applications in many different languages—shell is probably the top contender, believe it or not—and for various ecosystems. Along the way, I’ve developed… let’s say… opinions on how they should behave. But behavior and implementation are different topics, and today I would like to talk a little about the latter in the Rust ecosystem.