remove omf, use tide and fisher

files/fish/functions/_tide_parent_dirs.fish

@@ -0,0 +1,7 @@
+function _tide_parent_dirs --on-variable PWD
+    set -g _tide_parent_dirs (string escape (
+        for dir in (string split / -- $PWD)
+            set -la parts $dir
+            string join / -- $parts
+        end))
+end