setup z based on PWD variable

plugins/z/cd.fish

-#
-# Source a .rvmrc file in a directory after changing to it, if it exists.
-# To disable this feature, set rvm_project_rvmrc=0 in $HOME/.rvmrc
-#
-function cd --description "Change directory"
-  redefine_function 'cd' "$__fish_datadir/functions/cd.fish" '
-    function cd --description "Change working directory"
-      old_cd "$argv"
-
-      bash -c "source /usr/local/etc/profile.d/z.sh; _z --add `pwd -P`"
-    end
-'
-
-  cd "$argv"
-end

plugins/z/z.load

+function __check_z --on-variable PWD --description 'Setup z on directory change'
+  status --is-command-substitution; and return
+
+  bash -c "source /usr/local/etc/profile.d/z.sh; _z --add `pwd -P`"
+end