Here's an example of how to generate indexes from Markdown using a Lua
filter and ConTeXt output.

I have an input file, context-index.md:

 <#cb1-1>--- <#cb1-2>title: Test out Indexes from Spans in Markdown
<#cb1-3>linkcolor: green <#cb1-4>linkcontrastcolor: red <#cb1-5>---
<#cb1-6> <#cb1-7># Section One <#cb1-8> <#cb1-9>[Éomer]{.index}[Éomer]
let blow the horns to rally all men to his <#cb1-10>banner that could
come thither; for he thought to make a great <#cb1-11>shield-wall at
the last, and stand, and fight there on foot till all <#cb1-12>fell,
and do deeds of song on the fields of
<#cb1-13>[Pelennor]{.index}Pelennor, though no man should be left in
the West <#cb1-14>to remember the last [Mark, King of the]{.index}King
of the Mark.  So <#cb1-15>he rode to a green hillock and there set his
banner, and the [White <#cb1-16>Horse]{.index}White Horse ran rippling
in the wind. <#cb1-17> <#cb1-18>| Out of doubt, out of dark to the
day's rising <#cb1-19>| I came singing in the sun, sword unsheathing.
<#cb1-20>| To hope's end I rode and to heart's breaking: <#cb1-21>|
Now for wrath, now for ruin and a red nightfall! <#cb1-22>
<#cb1-23>These staves he spoke, yet he laughed as he said them. For
once more <#cb1-24>lust of battle was on him; and he was still
unscathed, and he was <#cb1-25>young, and he was king: the lord of a
fell people. And lo! even as he <#cb1-26>laughed at despair he looked
out again on the [Ships, <#cb1-27>Black]{.pandoc}black ships, and he
lifted up his sword to defy them. <#cb1-28> <#cb1-29>``` {=context}
<#cb1-30>\completeindex <#cb1-31>``` <#cb1-32>

I build it using a make file, GNUmakefile:

 <#cb2-1>all: context-index.ctx.pdf <#cb2-2> <#cb2-3>%.ctx.pdf : %.md
<#cb2-4>	pandoc -w context -o $@ --lua-filter=context-index.lua $<

The pandoc command to build it loads a Lua Filter
<https://pandoc.org/lua-filters.html>, context-index.lua:

 <#cb3-1>local function has_value (tab, val) <#cb3-2>   for index,
value in ipairs(tab) do <#cb3-3>      if value == val then <#cb3-4>
     return true <#cb3-5>      end <#cb3-6>   end <#cb3-7>   return
false <#cb3-8>end <#cb3-9> <#cb3-10>function Span(el) <#cb3-11>   if
el.classes and #el.classes > 0 then <#cb3-12>      if
has_value(el.classes, 'index') then <#cb3-13>         if FORMAT ==
"context" then <#cb3-14>            table.insert(el.content, 1,
pandoc.RawInline('context', '\\index{')) <#cb3-15>
table.insert(el.content, pandoc.RawInline('context', '}')) <#cb3-16>
      end <#cb3-17>      end <#cb3-18>   end <#cb3-19>   return
el.content <#cb3-20>end -- Span

Here's the pandoc command to build the PDF:

pandoc -w context -o context-index.ctx.pdf
--lua-filter=context-index.lua context-index.md

The PDF file it produces, context-index.ctx.pdf, is attached to this
e-mail. The makefile, the markdown source, and the lua filter are also in a
zip file attached to this message.

I'm not sure how to do this using LaTeX output or HTML output. Does anybody
else have ideas for those output formats?

On Tue, Aug 11, 2020 at 3:45 PM Marty Heyman <marty.heyman-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> We would like to use Pandoc Markdown as Source Language for a few complex
> and large technical manuals (100s of pages). Indexing key germs is
> seriously important. I searched these discussions and didn't see an obvious
> path (nor from the manual). Any success or potentially useful avenues
> you've tried?
>
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>


-- 
T. Kurt Bond, tkurtbond-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, https://tkurtbond.github.io

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