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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