Any file to PostScript, including pretty-printing
GNU a2ps converts almost anything to a PostScript file, ready for printing. It accomplishes this by being able to delegate files to external handlers, such as Groff and Gzip. It handles as many steps as is necessary to produce a pretty-printed file. It also includes some extra abilities for special cases, such as pretty-printing "--help" output.
Identify inputs that should be native inputs
|'groff' should probably be a native input