context-inrange

Turn \inrange{Figures}[fig:a, fig:c, fig:d, fig:e] into "Figures 1, 3-5".

Usage

Place inrange.lua and inrange.mkvi in your directory (or elsewhere on the search path), and type

\usemodule[inrange]

\inrange{Figures}{?}[fig:a, fig:b, fig:c]

to get "Figures 1-3?".

Figure out how to get the figure number string with prefixes, like '1.2.3'. Then modify inrange.lua to handle those (notes on what to alter are in the file, marked with TODO.)
Figure out how to let \inrange be a valid command for \definereferenceformat. The naïve approach, \definereferenceformat[inr][command=\inrange], doesn't work: the \goto is baked right into \strc_references_pickup_goto_indeed. See strc-ref.mkvi. Here is the baked-in \goto:
```
\doifreferencefoundelse{#label} % we need to resolve the text
  {\goto{\referencesequence}[#label]}
  {\let\currentreferencecontent\dummyreference
    \goto{\referencesequence}[#label]}%
\strc_references_stop_goto}
```