Show always full path on local instead of ~

[iPublicis]

I would like to know if someone know what to do to have always the full path on prompt instead of having ~ as a replacement of /home/username.

Meaning:

1. if I'm on my home dir I want to see /home/myusername instead of ~
2. if I'm any other dir I would like to see the full path instead of ~

[Teleft]

curl -L https://github.com/oh-my-fish/oh-my-fish/raw/master/bin/install | fish

[iPublicis]

curl -L https://github.com/oh-my-fish/oh-my-fish/raw/master/bin/install | fish

How does this reply to my question?
I want that Agnoster ZSH theme works as explained and you point me to another stuff with no explanation whatsoever!