* Context [25%]
** DONE Introduce context structure
** TODO Populate from env variables
** TODO Implement variable substitution in barbfiles
** TODO Carry over context across requests
   
* JQ filtering [0%]
** TODO Find a JQ-like library in rust
** TODO Use library to extract data from requests
** TODO Allow multiple named filters
** TODO Store filter output in context

* Support binary files [0%]
** TODO Have binary filepath as body
** TODO Output binary files to file system
** TODO Coerce filetype (to display seemingly binary files normally)

* Command line options [0%]
** TODO Multiple files on the command line
** TODO Filter override
** TODO Disable filtering altogether
** TODO Override header
 
* Add curses-based manager