fix logging when plenary is not available (#1390)

lua/core/log.lua

@@ -4,26 +4,57 @@ local Log = {}
 ---@param opts these are passed verbatim to Plenary.log
 ---@return log handle
 function Log:new(opts)
-  local status_ok, _ = pcall(require, "plenary.log")
+  local status_ok, handle = pcall(require, "plenary.log")
   if not status_ok then
-    return nil
+    vim.notify("Plenary.log is not available. Logging to console only", vim.log.levels.DEBUG)
   end
 
-  local obj = require("plenary.log").new(opts)
+  self.__handle = handle
+
   local path = string.format("%s/%s.log", vim.api.nvim_call_function("stdpath", { "cache" }), opts.plugin)
 
-  obj.get_path = function()
+  self.get_path = function()
     return path
   end
 
-  return obj
+  setmetatable({}, Log)
+  return self
+end
+
+function Log:add_entry(msg, level)
+  local status_ok, _ = pcall(require, "plenary.log")
+  if not status_ok then
+    return vim.notify(msg, vim.log.levels[level])
+  end
+  -- plenary uses lower-case log levels
+  return self.__handle[level:lower()](msg)
 end
 
 --- Creates or retrieves a log handle for the default logfile
 --- based on Plenary.log
 ---@return log handle
-function Log:get_default()
+function Log:new_default()
   return Log:new { plugin = "lunarvim", level = lvim.log.level }
 end
 
+function Log:trace(msg)
+  self:add_entry(msg, "TRACE")
+end
+
+function Log:debug(msg)
+  self:add_entry(msg, "DEBUG")
+end
+
+function Log:info(msg)
+  self:add_entry(msg, "INFO")
+end
+
+function Log:warn(msg)
+  self:add_entry(msg, "TRACE")
+end
+
+function Log:error(msg)
+  self:add_entry(msg, "TRACE")
+end
+
 return Log