Automatically apply skeleton snippets to certain filetypes if configured

.config/nvim/lua/config/defaults.lua

@@ -126,3 +126,13 @@ vim.api.nvim_create_autocmd("FileType", {
 		vim.opt_local.foldmethod = "marker"
 	end,
 })
+-- snippets
+vim.api.nvim_create_autocmd("FileType", {
+	pattern = "snippets",
+	group = configgroup,
+	callback = function()
+		vim.opt_local.expandtab = false
+		vim.opt_local.shiftwidth = 2
+		vim.opt_local.tabstop = 4
+	end,
+})

.config/nvim/lua/plugins/luasnip.lua

@@ -1,3 +1,30 @@
+-- idea stolen from: https://vi.stackexchange.com/a/42370
+local skelconfig = vim.api.nvim_create_augroup('SKEL_CONFIG', { clear = true })
+vim.api.nvim_create_autocmd({"BufRead", "BufNewFile"}, {
+	group = skelconfig,
+	callback = function()
+		-- another autocmd so it doesn't conflict 
+		-- with other plugins that like to insert text on file open
+		vim.api.nvim_create_autocmd("VimEnter", {
+			group = skelconfig,
+			callback = function()
+				-- stop if buffer is not empty!
+				if vim.fn.line("$") ~= 1 or vim.fn.getline(1) ~= "" then
+					return
+				end
+				local ls = require('luasnip')
+				local snippets = ls.get_snippets(vim.bo.ft)
+				for _, snippet in ipairs(snippets) do
+					if snippet["name"] == "_skeleton" then
+						ls.snip_expand(snippet)
+						return true
+					end
+				end
+			end
+		})
+	end,
+})
+
 return {
 	"L3MON4D3/LuaSnip",
 	version = "v2.*", -- just because the docs mention it