add stricter checking on urls and paths, and make sure that if one

package fails to load other may continue to load

lua/dep/package.lua

@@ -55,6 +55,17 @@ local root
 ---@type package[]
 local packages = {}
 
+--- check if a string seems to be a url
+---@param url string the "url" to check
+---@return boolean is_url
+local function is_url(url)
+  if url:sub(1, 8) == "https://" or
+    url:sub(1, 7) == "http://" then
+    return true
+  end
+  return false
+end
+
 --- check a spec to see if it's correct
 ---@param spec spec|string the specification to check
 ---@return spec|false spec if the spec is ok or false
@@ -117,6 +128,10 @@ local function check_spec(spec)
     if type(spec.url) ~= "string" then
       logger:log("spec", "spec.url must be a string in %s", spec[1])
       return false
+    elseif not is_url(spec.url) then -- more strict checking on urls
+      logger:log("spec", "spec.url must be a properly formatted url in %s",
+        spec[1])
+      return false
     end
   end
 
@@ -124,6 +139,9 @@ local function check_spec(spec)
     if type(spec.path) ~= "string" then
       logger:log("spec", "spec.path must be a string in %s", spec[1])
       return false
+    elseif not vim.fn.isdirectory(spec.path) then
+      logger:log("spec", "spec.path must be a valid directory in %s", spec[1])
+      return false
     end
   end