Calling Snippets Directly

[ThunderSloth]

Is there a way to trigger a snippet directly with lua using some sort of identifier?

One use case for this would be the ability to have modular snippets that could reference each-other. Right now, I achieve this with a lua module containing dynamic nodes that return whatever nodes I like to reuse. But I think it would be much more straightforward if I could just call another snippet directly.

[L3MON4D3]

You can use snip_expand(check DOC.md), you only have to store the snippets somewhere separate from luasnips snippet-collection since retrieving them from there is not really efficient.

But tbh, reusing dynamicNodes for this purpose sounds more straightforward than expanding a whole other snippet.

[ThunderSloth]

Okay, so I'm running into issues with dynamic nodes calling each other.

Basically I have one dynamic node function called paste, when called returns each line of LS_SELECT_RAW as an insert node with the default text equal to that line. I use it with some autosnippets on various brackets in order to easily surround, and if the select buffer is empty I have it set to return one insert node with empty default text.

The second dynamic node function (which is for LaTeX) I have called smartpairs"returns two function nodes that surround an insert node. The function nodes return the left and right sides of a set of parenthesis respectively, however if the insert node meets certain conditions, they return "\left(" and "\right)" instead.

Both of these functions work perfectly fine on their own but I'm trying to chain them together, having smartpairs call paste and I'm running into an error about attempting to index a nil value. The reason is because it seems there is no way to access the .env variable when a dynamic node function is called within another dynamic node function (at least the way I am currently trying.) I have attempted using parent to access the env (which works fine if not called from another dynamic node.) Makes sense that this doesn't work because things get tricky with dynamic/sn and parents. So to circumvent this I tried ls.session.current_nodes[vim.api.nvim_get_current_buf()] instead, but this didn't work either. After more debugging I found that the entire ls.sessions table to be nil.

tldr: when a dynamic node function calls another dynamic code function I cant access env in order to grab selected text

The smartpairs function that gets returned in a table:

	smart_pairs = function(args, parent, old_state, user_args)
		local nodes, LHS, RHS = unpack(user_args)
		local use_LR = function(text)
			return text[1][1]:match("frac") ~= nil or text[1][1]:match("[_^]") ~= nil
		end
		return sn(1, {
			f(function(text)
				return (use_LR(text) and "\\left" or "") .. LHS
			end, { 1 }),
			d(1, utils.paste, {}, {user_args = {nodes}}), -- replace this line with "nodes," and it works just fine
			f(function(text)
				return (use_LR(text) and "\\right" or "") .. RHS
			end, { 1 }),
		})
	end,

The paste function that gets returned in a table:

	paste = function(args, parent, old_state, user_args)
		print(require("luasnip.sessions"))
		local result, env = {}, ls.session.current_nodes[vim.api.nvim_get_current_buf()].env
		for j, v in ipairs(env.LS_SELECT_RAW) do
			table.insert(result, i(j, v))
			if j ~= #env.LS_SELECT_RAW then
				table.insert(result, t({"", ""}))
			end
		end
		return sn(nil, #result ~= 0 and result or {user_args and user_args.default or i(1)})
	end,

The snippet where the calls originate:

	s( -- parenthesis
		{trig = "(", snippetType = "autosnippet", priority = 2000},
		{d(1, tex.smart_pairs, {}, {user_args = {{{i(1, "")}, "(", ")"}}}),}
	),

I imagine I could sacrifice some DRY and flatten these two functions into one, but I'm curious if you can tell me what's going on here. Thanks!

EDIT: Or now that I'm thinking about it I could make a copy of the selected text table and pass it through to the paste function as a user_arg in case it can't access the parent.

[L3MON4D3]

Mhmm, at the very least, that's a very curious way of accessing env :D
Try local env = parent.snippet.env, that might do it
And damn, what timing, I just checked my mail xD

[ThunderSloth]

It works! I think at some point I accidentally switched from using parent.snippet.env to parent.env and ls.session.current_nodes[vim.api.nvim_get_current_buf()].env is what I saw in the external dynamic node update example on the wiki.