🚀 go-pugleaf

Here is the standard way that I've seen to do it.  As I recall I
got this from the indexing code (mainly awk scripts) available
from research.att.com (the ones described by Kernighan and Bentley
quite a few years back).  Something tells me they credit this to
Ravi Sethi, but I'm not certain.

  .	\" If the current diversion name is empty, print the index
  .	\" entry on standard error.  Else call ourself via the
  .	\" transparent mechanism so the output is generated when
  .	\" the diversion (keep/save) is actually output.
  .	\" Note there is a tab between the 9th arg and the page#.
  .de ix
  .nr PN \\n%
  .ie '\\n(.z'' .tm ix: \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8 \\$9	\\n(PN
  .el \\!.ix \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8 \\$9
  ..

	Rich Stevens  (rstevens@noao.edu)