Inspect.ps

A recursive inspection library for PostScript, stylised in the vein of Node.js's colourful util.inspect() output:

Installation

1. Download inspect.ps to wherever you store your PostScript libraries:

   $ curl https://git.io/JOsbC > /path/to/ghostscript/lib/inspect.ps

2. Configure GhostScript to whitelist the path, if necessary.

   $ export GS_LIB="/path/to/ghostscript/libs:$GS_LIB"

3. Verify successful installation by running:

   $ echo '(/path/to/ghostscript/libs) run << /Foo 1 >> ===' \
   | gs -sDEVICE=txtwrite -sOutputFile=- -q -sBATCH -dNOPAUSE -

Usage

Use === to inspect a single operand:

userdict ===

Use ? to inspect the entire stack à la pstack:

(A) (B) (C) (D) ?

Neither procedure modifies the stack, so dup-ing before inspection is unnecessary.