Re: requiring other lua files from parent directories from within filters

[jcr <ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Another approach is to use Lua's debug facilities to find the path to the 
script being executed, and add its directory to the Lua package path. This 
is the function I use:
```
local function addMyDirToPath()
  local myFile = debug.getinfo(2, "S").source:sub(2)
  local myDir = myFile:match("(.*)/.*") or '.'
  package.path = ("%s/?.lua;%s"):format(myDir, package.path)
end
```
To adapt this to your directory structure, just change the format string on 
the third line of the function to ` "%s/../library/?.lua;%s"`.
On Tuesday, October 3, 2023 at 12:50:39 PM UTC-4 Bastien DUMONT wrote:

> The argument of require() is not a path, but a string that is passed to a 
> template. The template is composed of semi-colon separated strings where ? 
> is stands for the argument of require() (after all . have been replaced 
> with /). For instance, if the template is:
>
> ./?.lua;/usr/local/share/lua/5.4/?.lua
>
> and you pass 'library.library' to it, Lua will search in 
> ./library/library.lua and /usr/local/share/lua/5.4/library/library.lua
>
> The path is controlled by environment variables. In your case, if all 
> loaded files are in the ../library directory, I would advise to call your 
> script with:
>
> LUA_PATH='../library/?.lua' pandoc-lua script.lua
>
> and to write in inner/script.lua:
>
> library = require("library")
>
> Of course, you can also set the path to '../?.lua;./?.lua' if you want to 
> be able to load files from the current directory and to write explicitely 
> the path to library.lua as library.library!
>
> Le Tuesday 03 October 2023 à 09:17:04AM, ch_...-S0/GAf8tV78@public.gmane.org a écrit :
> > I have the following file structure:
> > 
> > inner/script.lua
> > library/library.lua
> > 
> > I try to load the library from within the script
> > 
> > library = require("../library/library.lua")
> > 
> > but get an error when running inside inner: pandoc lua script.lua
> > 
> > Error running Lua:
> > script.lua:1: module '../library/library.lua' not found:
> > no field package.preload['../library/library.lua']
> > no file '/usr/local/share/lua/5.4////library/library/lua.lua'
> > no file '/usr/local/share/lua/5.4////library/library/lua/init.lua'
> > no file '/usr/local/lib/lua/5.4////library/library/lua.lua'
> > no file '/usr/local/lib/lua/5.4////library/library/lua/init.lua'
> > no file './///library/library/lua.lua'
> > no file './///library/library/lua/init.lua'
> > no file '/usr/local/lib/lua/5.4////library/library/lua.so'
> > no file '/usr/local/lib/lua/5.4/loadall.so'
> > no file './///library/library/lua.so'
> > no file '/usr/local/lib/lua/5.4/.so'
> > no file '/usr/local/lib/lua/5.4/loadall.so'
> > no file './.so'
> > stack traceback:
> > script.lua:1: in main chunk
> > 
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> > References:
> > 
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> > [2] 
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>

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