When running pandoc from within makefiles I always do something a bit like
this (where $PANDOCDIR contains my project-specific pandoc resources):

LUA_PATH="$PANDOCDIR/?.lua;;" pandoc --data-dir $PANDOCDIR --resource-path
$PANDOCDIR

So lua utilities can be in $PANDOCDIR (perhaps I should move them to
$PANDOCDIR/lua), and filters can be in $PANDOCDIR/filters.

On Fri, 20 Jan 2023 at 22:07, ChrisD <cd34-gg-4SSc53hpTiu9TMao6EloiEEOCMrvLtNR@public.gmane.org> wrote:

> I hit send too soon. I'm confusing where Pandoc looks for .lua filters
> specified on the command line with where the lua interpreter looks for .lua
> files that are included with require functions. Pandoc looks where the
> manual says. Lua looks according to package.path.
>
> This is all my errors. Sorry!
>
>
> On 1/20/2023 1:55 PM, ChrisD wrote:
>
> I researched this a little more. The lua "require" function searches paths
> using
>     global variable LUA_PATH
>     environment variable LUA_PATH
>     a fixed path which is "easy to change when you compile lua"
>
> I do not have either of the LUA_PATH values set.
>
> Inside the interpreter, the search path is contained in package.path.
> On my win 10/pandoc 3.0 install, package.path contains this string (I have
> split it across lines to be more readable):
>     C:\USERS\<username>\APPDATA\LOCAL\PANDOC\lua\?.lua;
>     C:\USERS\<username>\APPDATA\LOCAL\PANDOC\lua\?\init.lua;
>     C:\USERS\<username>\APPDATA\LOCAL\PANDOC\?.lua;
>     C:\USERS\<username>\APPDATA\LOCAL\PANDOC\?\init.lua;
>     C:\USERS\<username>\APPDATA\LOCAL\PANDOC\..\share\lua\5.4\?.lua;
>     C:\USERS\<username>\APPDATA\LOCAL\PANDOC\..\share\lua\5.4\?\init.lua;
>     .\?.lua;
>     .\?\init.lua
>
> I'm surprised not to find
>     C:\Users\<username>\AppData\Roaming\pandoc\filters
> in that list.
>
> But it looks like (3) is enabled by the first line of package.path. I have
> no clue how that gets set.
>
>
>
>
>
>
> On 1/20/2023 1:25 PM, John MacFarlane wrote:
>
> Manual definitely covers both 1 and 2: it says
>
> In order of preference, pandoc will look for Lua filters in
>
> • a specified full or relative path,
>
> • $DATADIR/filters where $DATADIR is the user data directory
> (see --data-dir, above).
>
> I wouldn’t expect 3 to work.  If it does, that’s quite unexpected.  Can
> anyone else reproduce this?
>
>
> On Jan 20, 2023, at 9:14 AM, ChrisD <cd34-gg-4SSc53hpTiu9TMao6EloiEEOCMrvLtNR@public.gmane.org> wrote:
>
> Sorry, this is my error.
>
> Filters work when placed in
> 1) The current working directory
> 2) $DATADIR/filters
> 3) <Location of pandoc.exe>/lua
>
> So the manual is correct, though it only specifies (2), not (1) or (3).
>
> Sorry for the noise.
>
>
> On 1/20/2023 9:47 AM, ChrisD wrote:
>
> What is the correct location for lua filters?
>
> The pandoc manual says it will search for lua filters in $DATADIR/filters.
> However that doesn't work for me on Windows. What does work is:
>
> 1) The current working directory
> 2) $DATADIR/lua
> 3) <Location of pandoc.exe>/lua
>
> The location of pandoc.exe for me is user/<username>/AppData/Local/Pandoc.
> This is on my path.
>
> Is this an error in the manual, or do I have something configured wrong?
> It seems to me I must have read somewhere to use the lua sub-directory, but
> I can't find it anywhere online now.
>
>
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