Simple ZSH nix shell

• adds an icon to $RPS1 when you are in a nix shell
• makes nix shells drop you into zsh by default
• when you exit from the zsh nix shell, you will drop back into the invoking zsh shell, so if you need to go into bash for whatver reason invoke bash from the zsh shell.

install

source simple-zsh-nix-shell.zsh manually or with a plugin manager

add this to your ~/.bashrc to land in zsh your first time entering bash in a nix shell. this is considerably less hacky than a wrapper around nix/nix-shell imo

if [ ! -z ${SIMPLE_ZSH_NIX_SHELL_BASH+x} ] ;
  then source $SIMPLE_ZSH_NIX_SHELL_BASH
fi