How to automatically jump forward

[oiiiiiiii]

Is there a way to define a snippet with a insert node (or any "tabstop"), where when the text entered satisfies some condition (e.g. reaches a certain length) the next jump-index gets automatically activated, without me explicitly jumping?

[L3MON4D3]

Mhmm, you could do this by getting the current node in an autocommand (local node = require("luasnip").current_nodes[args.buf]), checking the length of its content (local len = #node:get_text()[1]), and then jumping (probably best to do that in a vim.schedule, so vim.schedule(function() require("luasnip").jump(1) end)).

But I really hesitate to recommend this, as it sounds pretty brittle, and like something luasnip should handle for you..
What exactly are you trying to accomplish? Maybe there's an idiomatic way :)

[oiiiiiiii]

Thanks for your answer :)
I want to create a snippet cal for LaTeX that expands to \mathcal{$1}. Typically, I only want to apply this to a single letter (I don't know if this even works with multiple), so as soon as I enter the letter, I don't need to be inside the first tabstop anymore and would like my cursor outside the braces (i.e. at the last tabstop - $0) like when luasnip.jump(1) was called. I found a somewhat hacky solution by using a function node that always returns an empty string but depends on the first tabstop. And if it's length is greater 0 then luasnip.jump(1) is called. But maybe there is a better solution?

[L3MON4D3]

Oh, one possibility is to use regTrig, you could change the trigger to be cal(%a) and then insert the captured character between the {}:

s({regTrig=true, trig="cal(%a)"}, {
	l("\\mathcal{" .. l.CAPTURE1 .. "}")
})

[oiiiiiiii]

Now that you say so I wonder how I didn't come up with this :D
Thanks a lot! :)

[L3MON4D3]

Happy to help :D