asdf plugin for fish.
This will ensure that asdf is installed under ~/.asdf and load it on shell startup.
It also setups completions.
If you want to install asdf somewhere else, set ASDF_DIR before loading
the plugin (before fundle init if using fundle).
Installation with fundle
Add
fundle plugin 'tuvistavie/fish-asdf'
to your config.fish and that's it.