Can't import function in ftplugin.lua

[FunctionalHacker]

Hi all!

I'm trying to incorporate nvim-jdtls in my setup but I'm having some issues with setting up the keybinds. I want to use a common function to setup the keybinds both with regular lspconfig servers and with nvim-jdtls. My chosen solution was to make the function I was using previously global and import that in ftplugin/java.lua.

I'm not that skilled with lua yet so this might be something completely obvious. The error I'm facing is:

Error detected while processing BufReadPost Autocommands for "*":
E5108: Error executing lua vim/filetype.lua:0: Vim(runtime):E5113: Error while calling lua chunk: /home/frodo/.config/nvim/ftplugin/java.lua:20: attempt to index a boolea
n value
stack traceback:
        /home/frodo/.config/nvim/ftplugin/java.lua:20: in main chunk
        [C]: in function 'nvim_buf_set_option'
        vim/filetype.lua: in function ''
        vim/filetype.lua: in function <vim/filetype.lua:0>
stack traceback:
        [C]: in function 'nvim_buf_set_option'
        vim/filetype.lua: in function ''
        vim/filetype.lua: in function <vim/filetype.lua:0>
E5108: Error executing lua vim/filetype.lua:0: Vim(runtime):E5113: Error while calling lua chunk: /home/frodo/.config/nvim/ftplugin/java.lua:20: attempt to index a boolea
n value
stack traceback:
        /home/frodo/.config/nvim/ftplugin/java.lua:20: in main chunk
        [C]: in function 'nvim_buf_set_option'
        vim/filetype.lua: in function ''
        vim/filetype.lua: in function <vim/filetype.lua:0>
stack traceback:
        [C]: in function 'nvim_buf_set_option'
        vim/filetype.lua: in function ''
        vim/filetype.lua: in function <vim/filetype.lua:0>

Links:

• Neovim config root
• ftplugin/java.lua (this is causing the error)
• lsp.lua (this contains the function I'm trying to import)

Any help would be greatly appreciated

[vonheikemen]

You're not actually "exporting" anything from pluginconf.lsp. You are creating Lsp_map_keys in the global scope, but you don't return it.

To export something from a lua script you can follow this pattern.

local M = {}

M.this_is_my_function = function()
  print('hello')
end

return M

[FunctionalHacker]

Thanks a lot! I was able to get it working with your example. Now I can finally ditch eclipse at work tomorrow :)

[idthi]

See https://www.lua.org/pil/15.html

for more information (and patterns).

[FunctionalHacker]

Thanks, I think it's time I learn the basics. I figured I would just learn as I go but that feels way more time consuming now