feat: warn about wrong 'dir' values

Makefile

@@ -1,5 +1,5 @@
 format:
-	stylua -v --verify lua/rocks-config/ plugin/
+	stylua -v --verify lua/rocks-dev/ plugin/
 
 check:
-	luacheck lua/rocks-config plugin/
+	luacheck lua/rocks-dev plugin/

lua/rocks-dev/init.lua

@@ -1,4 +1,5 @@
 local rocks = require("rocks.api")
+local log = require("rocks.log")
 
 local rocks_dev = {}
 
@@ -21,11 +22,14 @@ function rocks_dev.setup(user_configuration)
         return
     end
 
+    log.trace("rocks-dev setup")
+
     local has_rocks_config, rocks_config = pcall(require, "rocks-config")
     local config_hook = has_rocks_config and type(rocks_config.configure) == "function" and rocks_config.configure
         or function(_) end
 
     local dev_path = user_configuration.dev and user_configuration.dev.path
+    local errors_found = false
 
     for _, rock_spec in pairs(user_configuration.plugins or {}) do
         ---@cast rock_spec rocks-dev.RockSpec
@@ -37,13 +41,21 @@ function rocks_dev.setup(user_configuration)
         end
         if path then
             vim.opt.runtimepath:append(path)
+            if vim.fn.isdirectory(path) == 0 then
+                log.warn(rock_spec.name .. " dir value '" .. path .. "' is not a directory")
+                errors_found = true
+            end
             config_hook(rock_spec.name)
 
             -- NOTE: We can't support `opt` for dev plugins,
             -- as it doesn't integrate with `:packadd`
             require("rtp_nvim").source_rtp_dir(path)
         end
     end
+
+    if errors_found then
+        vim.notify("Issues while loading rocks-dev configs. Run ':Rocks log' for more info.", vim.log.levels.WARN)
+    end
 end
 
 rocks.register_rock_handler(require("rocks-dev.local-rock-handler"))