fix(list): add option to ignore empty entries

closes: #15

lua/pathlib/base.lua

@@ -32,7 +32,7 @@ function Path:_init(...)
         self:copy_all_from(s)
       else
         assert(not s:is_absolute(), ("new: invalid root path object in %sth argument: %s"):format(i, s))
-        self._raw_paths:extend(s._raw_paths)
+        self._raw_paths:extend(s._raw_paths, true)
       end
     elseif type(s) == "string" then
       local path = fs.normalize(s, { expand_env = true }):gsub([[^%./]], ""):gsub([[/%./]], "/"):gsub([[//]], "/")
@@ -46,7 +46,7 @@ function Path:_init(...)
       elseif vim.tbl_contains(splits, "..") then -- deal with '../' later in `self:resolve()`
         run_resolve = true
       end
-      self._raw_paths:extend(splits)
+      self._raw_paths:extend(splits, true)
     else
       error("PathlibPath(new): ValueError: Invalid type as argument: " .. ("%s (%s: %s)"):format(type(s), i, s))
     end

lua/pathlib/utils/lists.lua

@@ -20,15 +20,25 @@ function str_list.new()
 end
 
 ---@param value string
-function str_list:append(value)
+---@param ignore_empties boolean? # If true, does not add entries that are empty.
+function str_list:append(value, ignore_empties)
+  if ignore_empties and value == "" then
+    return
+  end
   self[#self + 1] = value
 end
 
 ---@param list PathlibStrList
-function str_list:extend(list)
+---@param ignore_empties boolean? # If true, does not add entries that are empty.
+function str_list:extend(list, ignore_empties)
   local start_from = #self
+  local ignores = 0
   for index, value in ipairs(list) do
-    self[start_from + index] = value
+    if ignore_empties and value == "" then
+      ignores = ignores + 1
+    else
+      self[start_from + index - ignores] = value
+    end
   end
 end