Modern CLI to set default file handlers by extension or MIME type
copied from cf-post-staging / handlr-regexhandlr-regex is a fork of the unmaintained handlr with additional support for
regular expressions. It is a modern alternative to xdg-utils
that allows to set default file handlers by file extension or MIME type, to set arbitrary commands as handlers based
on regular expressions, to open multiple files at once, and more.