Activate specific source using a prefix character, thus remove the prefix from the inserted text

[DrKGD]

I'd like to display snippets only by prefixing them using ";", so far i've found someone who already dealt with that

snippets = {
	name = "SNP",
	module = "blink.cmp.sources.snippets",
	score_offset = 95,

	-- THANKS: https://github.com/linkarzu/dotfiles-latest/blob/main/neovim/neobean/lua/plugins/blink-cmp.lua
	should_show_items = function()
		local col = vim.api.nvim_win_get_cursor(0)[2]
		local before_cursor = vim.api.nvim_get_current_line():sub(1, col)
		return before_cursor:match(";%w*$") ~= nil
	end,
}

He also provides a way to "delete" the special prefix character soon after accepting the snippet, but I feel like it is more of a hack and could easily break.

I tried experimenting on my own, but I don't think it is possibile to hijack the item itself to drop the prefix character, all I managed to do is prefixing the displayed label with the character itself

transform_items = function(a, items)
	return vim.iter(items)
		:map(function(item)
			item.label = (";%s"):format(item.label)
			return item
		end)
		:totable()
end

Note that I am not using luasnip as of now (as it is duplicating results) but the builtin snippet source, having friendly-snippets installed. Thanks!