it-infra/nixops/fish-nix-shell/bin/fish-nix-shell

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#!/bin/sh
function init_fish () {
cat <<EOF
# Overwrite the nix-shell command
function nix-shell
fish-nix-shell-wrapper \$argv
set -gx FISH_NIX_SHELL_EXIT_STATUS \$status
end
EOF
for arg in "$@"; do
case "$arg" in
--info-right)
cat <<EOF
# Print additional information inside a nix-shell environment
function fish_right_prompt
nix-shell-info
set -e FISH_NIX_SHELL_EXIT_STATUS
end
EOF
;;
*) exit 1;;
esac
done
}
cat <<EOF
# If you see this output, you probably forgot to pipe this output into 'source':
# fish-nix-shell $@ | source
EOF
init_fish "$@"