Some help with dynamic_node_external_update

[ashprice]

Hello,

I wanted to write a snippet with the function mentioned in the docs. Please bear with me, I am not very good with lua and have probably made a basic mistake!

First, in my init.lua for nvim I have the following, which binds the change-choice and the dynamic_node_external_update keys to the same key (found in the Wiki or a discussion, I forget which):

-- feel free to change the keys to new ones, those are just my current mappings
vim.keymap.set("i", "<C-f>", function ()
    if ls.choice_active() then
        return ls.change_choice(1)
    else
        return _G.dynamic_node_external_update(1) -- feel free to update to any index i
    end
end, { noremap = true })
vim.keymap.set("s", "<C-f>", function ()
    if ls.choice_active() then
        return ls.change_choice(1)
    else
        return _G.dynamic_node_external_update(1)
    end
end, { noremap = true })
vim.keymap.set("i", "<C-d>", function ()
    if ls.choice_active() then
        return ls.change_choice(-1)
    else
        return _G.dynamic_node_external_update(2)
    end
end, { noremap = true })
vim.keymap.set("s", "<C-d>", function ()
    if ls.choice_active() then
        return ls.change_choice(-1)
    else
        return _G.dynamic_node_external_update(2)
    end
end, { noremap = true })

Then I also have all the rest of the code associated with the dynamic_node_external_update as given in the wiki in a tex.lua file loaded into my config via luasnip.loaders.from_lua. Snippets within that file are loaded via a return { } table. For now I am trying to use the default tab snippet given in the wiki:

    s("tab", fmt([[
    \begin{{tabular}}{{{}}}
    {}
    \end{{tabular}}
    ]], {i(1, "c"), d(2, tab, {1}, {
      user_args = {
        -- Pass the functions used to manually update the dynamicNode as user args.
        -- The n-th of these functions will be called by dynamic_node_external_update(n).
        -- These functions are pretty simple, there's probably some cool stuff one could do
        -- with `ui.input`
        function(snip) snip.rows = snip.rows + 1 end,
        -- don't drop below one.
        function(snip) snip.rows = math.max(snip.rows - 1, 1) end
      }
    } )}))

However, when I try to use this snippet in a tex file, the first part of this snippet works (number of columns), but the dynamic_node_external_update function gives me the following error:

E5108: Error executing lua: /home/hearth/.config/nvim/init.lua:111: attempt to call field 'dynam
ic_node_external_update' (a nil value)                                                          
stack traceback:                                                                                
        /home/hearth/.config/nvim/init.lua:111: in function </home/hearth/.config/nvim/init.lua:
107>  

I am not really sure how to troubleshoot this error; if I have messed something up with the scope of functions, or the like. Any guidance would be warmly welcomed.

[ashprice]

Update: I have solved the issue by moving the first section of the code in the wiki to my init.lua and the latter to the tex.lua file.