Re: Thoughts trying to write a Lua filter

[EBkysko <ebkysko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I know this is borderline necroposting, but I was just faced with this 
problem, dpi doesn't seem accessible in lua filters (not in 
`PANDOC_READER_OPTIONS` anyway, which are reader options). So in case 
anyone wants a hint, here goes...

Since I usually invoke pandoc from a script (a windows batch in my case), I 
just create (set) the dpi to a variable (say 'dpi'), and then pass it to 
both `--dpi` and `-M` on the pandoc command line.

So in a win batch that would be, for example:

```
...
set dpi=300
...
pandoc %1 %otheroptions% -M dpi=%dpi% --dpi=%dpi% -o %output%
```

Then in the lua file, the first filter in the return list would be a 
`Meta(meta)` filter that would retrieve the dpi through meta["dpi"] and put 
in a lua variable to be used.

Yes, it's redundant, but I don't see how else (apart from setting an 
environment variable, but it's the same principle).

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