cleanup: remove unnecessary filesystem helper methods

lua/oil/fs.lua

@@ -28,13 +28,6 @@ M.is_absolute = function(dir)
   end
 end
 
-M.abspath = function(path)
-  if not M.is_absolute(path) then
-    path = vim.fn.fnamemodify(path, ":p")
-  end
-  return path
-end
-
 ---@param path string
 ---@param cb fun(err: nil|string)
 M.touch = function(path, cb)
@@ -80,38 +73,6 @@ M.os_to_posix_path = function(path)
   end
 end
 
---- Returns true if candidate is a subpath of root, or if they are the same path.
----@param root string
----@param candidate string
----@return boolean
-M.is_subpath = function(root, candidate)
-  if candidate == "" then
-    return false
-  end
-  root = vim.fs.normalize(M.abspath(root))
-  -- Trim trailing "/" from the root
-  if root:find("/", -1) then
-    root = root:sub(1, -2)
-  end
-  candidate = vim.fs.normalize(M.abspath(candidate))
-  if M.is_windows then
-    root = root:lower()
-    candidate = candidate:lower()
-  end
-  if root == candidate then
-    return true
-  end
-  local prefix = candidate:sub(1, root:len())
-  if prefix ~= root then
-    return false
-  end
-
-  local candidate_starts_with_sep = candidate:find("/", root:len() + 1, true) == root:len() + 1
-  local root_ends_with_sep = root:find("/", root:len(), true) == root:len()
-
-  return candidate_starts_with_sep or root_ends_with_sep
-end
-
 local home_dir = assert(uv.os_homedir())
 
 ---@param path string