Can a function in *luasnip-match* return a snippetNode?

[no-vici]

Dear LuaSnip lovers,

I'm new to Lua and obviously to LuaSnip.

I would like to have a snippet for ConTEXt Lua that changes the output (which might have an insertNode) based on the text in the first insertNode.

For example:

\start(1) -- (1) is i(1)
i(2, "type here")
\stop(3) -- (3) is rep(1), a copy of i(1)

If i(1) == "itemize", then the output would be:
\startitemize[char] -- char is another insertNode: a, n ...
\item i(2)
\stopitemize

Bellow is what I could come up with:

	s("start", {
		t {"\\start"}, i(1), m(1, 
        function (args)
            local input_text = args[1][1]:lower()
            if input_text == "itemize" then
                -- This function shall return a string, 
                -- returning snippetNodes does not work.
                return "[a] \n\n \\item "
                -- return sn(nil, { t {"["}, i(1, "[a]"), t {"]"}, t {"", "", "\\item "})
            elseif input_text == "placefigure" then
                return "\n\n\t\\externalfigure[fig][opt]"
            elseif input_text == "chapter" 
                or input_text == "section" 
                or input_text == "subsection" then
                return "[title={}]\n\n"
            else
                return '\n\n'
            end
		end), 
        i(2, "type here"), t {"","", "\\stop"}, rep(1),
	}),

The function in luasnip-match only returns values as strings. I'm stuck at the part that I would like to jump to and edit, e.g, when I type "itemize", "itemize[a]" would come up, then I could jump into the "[a]" and change "a" to "n" or anything else.

With strings as returns of luasnip-match's function, I have to manually jump to "[a]" and change "a" to what I need.

If you have any thought, please kindly share with me.

Thank you so much in advance.

[L3MON4D3]

Hi!
I think you'll want to use dynamicNode, it can generate both text and new insertNodes based on some input.

[no-vici]

Hope these lines will save ConTEXt users a lot of typing time:

s("start", {
		t({ "\\start" }),
		i(1),
		d(2, function(args)
            -- The function inside dynamicNode always return a snippetNode,
            -- returning strings will cause errors.
            -- args[1][1] is the input text from i(1)
			local input_text = args[1][1]
			if input_text == "itemize" then
				return sn(nil, { t({ "[" }), i(1, "a"), t({ "]" }), t({ "", "", "\\item " }), i(2, "your item") })
			elseif input_text == "placefigure" then
				return sn(
					nil,
					{ t({ "", "", "\t\\externalfigure[" }), i(1, "fig"), t({ "][" }), i(2, "opt"), t({ "]" }) }
				)
			elseif input_text == "chapter" or input_text == "section" or input_text == "subsection" then
				return sn(nil, { t({ "[title={" }), i(1, "Title"), t({ "}]" }), t({ "", "", "" }), i(2, "input text") })
			else
				return sn(nil, { t({ "", "" }), i(1, "input text") })
			end
		end, { 1 }),
		t({ "", "", "\\stop" }),
		rep(1),
	}),

[no-vici]

@L3MON4D3,

Honestly, I have spent the last three days on the problem and could not figure it out. Once again, thank you so so much.

I would love to buy you a cup of coffee ;)

[L3MON4D3]

Hah, thank you :D
And feel free to ask earlier! I really don't mind such questions since they're public and will help other users as well :)
Oh, and part of the wiki is meant for examples/usable snippets, definitely add your snippet there for visibility

[no-vici]

@L3MON4D3,
You are a very kind person, giving a away all your hard work on LuaSnip and the support along its way to the users for nothing.
I will fine-tune my snippets for ConTEXt and share them with people on LuaSnip's wiki.

Thank you once more.

[L3MON4D3]

Warms my heart to hear this, thank you ❤️❤️