install-brew: fish support?

[boredsquirrel]

~ ❯❯❯ . /var/home/linuxbrew/.linuxbrew/bin/brew
/var/home/linuxbrew/.linuxbrew/bin/brew (Zeile 60): Unsupported use of '='. In fish, please use 'set BREW_FILE_DIRECTORY "$(quiet_cd "${0%/*}/" && pwd -P)"'.
BREW_FILE_DIRECTORY="$(quiet_cd "${0%/*}/" && pwd -P)"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
aus der Quelldatei /var/home/linuxbrew/.linuxbrew/bin/brew
.: Error while reading file '/var/home/linuxbrew/.linuxbrew/bin/brew'

btw piping an install script to bash... I dont know