Co-authored-by: Kyle Carberry <kyle@carberry.com>
Co-authored-by: Muhammad Atif Ali <atif@coder.com>
Co-authored-by: Muhammad Atif Ali <me@matifali.dev>
`--variable` is used frequently enough to deserve a shorthand. Unfortunately,
`-v` is taken by verbose, and `-V` is too easily confused with version or
verbose, so we're left with "--var".