(eplain.info)Proofing index terms

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4.12.1.4 Proofing index terms
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As you are reading through a manuscript, it is helpful to see what terms
have been indexed, so you can add others, catch miscellaneous errors,
etc. (Speaking from bitter experience, I can say it is extremely
error-prone to leave all indexing to the end of the writing, since it
involves adding many TeX commands to the source files.)

   So Eplain puts index terms in the margin of each page, if you set
'\indexproofingtrue'. It is 'false' by default. The terms are typeset by
the macro '\indexproofterm', which takes a single argument, the term to
be typeset. Eplain's definition of '\indexproofterm' just puts it into
an '\hbox', first doing '\indexprooffont', which Eplain defines to
select the font 'cmtt8'. With this definition long terms run off the
page, but since this is just for proofreading anyway, it seems
acceptable.

   On the other hand, we certainly don't want the index term to run into
the text of the page, so Eplain uses the right-hand side of the page
rather than the left-hand page (assuming a language read left to right
here). So '\ifodd\pageno', Eplain kerns by '\outsidemargin', otherwise
by '\insidemargin'. If those macros are undefined, '\indexsetmargins'
defines them to be one inch plus '\hoffset'.

   To get the proofing index entries on the proper page, Eplain defines
a new insertion class '\@indexproof'. To unbox any index proofing
material, Eplain redefines '\makeheadline' to call '\indexproofunbox'
before the original '\makeheadline'. Thus, if you have your own output
routine, that redefines or doesn't use '\makeheadline', it's up to you
to call '\indexproofunbox' at the appropriate time.