fish-powerline-on-ubuntu-the-easy-way/fish_powerline_ubuntu_the_easy_way.md

Tested on Ubuntu 17.04

apt install fish powerline

This pulls in fonts-powerline python-powerline python-psutil python3-powerline

add the following lines to ~/.config/fish/config.fish

set fish_function_path $fish_function_path "/usr/share/powerline/bindings/fish"
source /usr/share/powerline/bindings/fish/powerline-setup.fish
powerline-setup

and then start a new instance of fish by typing fish

Presumably if you have a different set up or distro, you can use grep/find to get the above information.

# these commands work with bash or fish
cd /
find -name fish 2>&1 | grep bindings
# which returns
./usr/share/powerline/bindings/fish
# and then
find -name '*.fish' 2>&1 | grep -e 'powerline-setup'
# returns
./usr/share/powerline/bindings/fish/powerline-setup.fish