Don't ignore errors, warn user when snippet loading fails

Author: bew

lua/luasnip/loaders/from_lua.lua

@@ -160,15 +160,19 @@ local function _luasnip_load_file(file)
 		get_loaded_file_debuginfo,
 		nil
 	)
-	local run_ok, file_snippets, file_autosnippets = pcall(func)
+	local run_ok, file_snippets_or_err, file_autosnippets = pcall(func)
 	-- immediately nil it.
 	_G.__luasnip_get_loaded_file_frame_debuginfo = nil
 
 	if not run_ok then
-		log.error("Failed to execute\n: %s", file, file_snippets)
-		error("Failed to execute " .. file .. "\n: " .. file_snippets)
+		local err = file_snippets_or_err
+		log.error("Failed to execute snippet file %s\n: %s", file, err)
+		loader_util.msg_user_on_snippet_load_error("from_lua loader", file, err)
+		error(("Failed to execute snippet file %s\n: %s"):format(file, err))
 	end
 
+	local file_snippets = file_snippets_or_err
+
 	-- make sure these aren't nil.
 	file_snippets = file_snippets or {}
 	file_autosnippets = file_autosnippets or {}

lua/luasnip/loaders/util.lua

@@ -286,6 +286,19 @@ local function scopestring_to_filetypes(str)
 	return vim.split(str_trimmed, "%s*[.,]%s*")
 end
 
+--- Notify the user that loading a snippet file failed
+---@param what string
+---@param where string
+---@param error string
+local function msg_user_on_snippet_load_error(what, where, error)
+	local message = "LuaSnip: " .. what .. " failed to load snippets from " .. where
+	local see_more = "-> Use `:lua require'luasnip'.log.open()` for more details"
+	vim.notify(
+		("%s\n: %s\n\n%s"):format(message, error, see_more),
+		vim.log.levels.WARN
+	)
+end
+
 return {
 	filetypelist_to_set = filetypelist_to_set,
 	split_lines = split_lines,
@@ -302,4 +315,5 @@ return {
 	add_file_snippets = add_file_snippets,
 	normalize_opts = normalize_opts,
 	scopestring_to_filetypes = scopestring_to_filetypes,
+	msg_user_on_snippet_load_error = msg_user_on_snippet_load_error,
 }