Inspect.ps

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

Preview of highlighted output

Installation

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

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

Configure GhostScript to whitelist the path, if necessary.
```
$ export GS_LIB="/path/to/ghostscript/libs:$GS_LIB"
```

Verify successful installation by running:

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

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.