Dynamically updated snippet preview text

[ribru17]

Hello and thanks for the wonderful plugin! I had a quick question: I followed the wiki example to get a snippet for a markdown table of variable size:

  s({ trig = 'tbl(%d+)x(%d+)', regTrig = true }, {
    d(1, function(_, snip)
      local nodes = {}
      local i_counter = 0
      local hlines = ''
      for _ = 1, snip.captures[2] do
        i_counter = i_counter + 1
        table.insert(nodes, t('| '))
        table.insert(nodes, i(i_counter, 'Column_' .. i_counter))
        table.insert(nodes, t(' '))
        hlines = hlines .. '| -------- '
      end
      table.insert(nodes, t { '|', '' })
      hlines = hlines .. '|'
      table.insert(nodes, t { hlines, '' })
      for c_i = 1, snip.captures[1] do
        for c_j = 1, snip.captures[2] do
          i_counter = i_counter + 1
          table.insert(nodes, t('| '))
          table.insert(nodes, i(i_counter, 'Cell_' .. c_i .. '_' .. c_j))
          table.insert(nodes, t(' '))
        end
        table.insert(nodes, t { '|', '' })
      end
      return sn(nil, nodes)
    end),
  }),

but when expanding the snippet it looks like this:

and I've seen in some videos (and noticed in e.g. the emmet lsp snippets) that there are dynamic snippet previews, i.e. I would like my table snippet preview to e.g. show tbl3x5~ when i am typing a 3x5 table, and if I type another 5 for example I would like it to show the preview tbl3x55~. Is it possible to do this with such a snippet? I have looked everywhere and not had much luck. Thank you!

PS: An example of what I am talking about with a dynamic snippet preview:

[atticus-sullivan]

I'm also not aware of a way to get the functionality you want. So this is more a feature request, but I think this is more of an issue what cmp shows you. Thus saadparwaiz1/cmp_luasnip would be the right place to implement this.
Also have a look at saadparwaiz1/cmp_luasnip#6, I think this is closely related.

[ribru17]

Ahh thanks so much for the response. I also see that there was an issue raised about this in this repo a while ago that I missed. Thanks for pointing me in the right direction! Going to close this now.