{ config , pkgs , ... } : {
	programs.fish = {
		enable = true ;
		functions = {
			fish_prompt = ''
				# get status to set colour later
				set -f s $status

				# nix shell component
				set pkgs (echo $PATH | tr ' ' "\n" | grep '^/nix/store' \
					| sed 's#^[^-]*-##;s#-[^-]*$##' | xargs)
				if test -n "$pkgs"
					set_color yellow
					echo -n "nix: $pkgs "
				end

				# ssh component
				if test -n "$SSH_CLIENT$SSH_TTY$SSH_CONNECTION"
					set_color blue
					echo -n (whoami)@(hostname)' '
				end

				# pwd
				test $s -eq 0 && set_color magenta || set_color red
				echo -n (prompt_pwd)

				# git component
				set_color green
				set branch (git branch 2> /dev/null | grep '^*' \
					| cut -d'*' -f 2)
				set_color green
				echo -n $branch

				# prompt component
				set_color brwhite
				echo -n ' $ '
				set_color normal
			'' ;
			fish_greeting = ''
				source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.fish
			'' ;
			mkcd = "mkdir -p $argv && cd $argv"                ;
			xv   = "touch $argv && chmod +x $argv && hx $argv" ;
			clwy = ''
				curl -s -X POST -H "Content-Type: text/plain" -d "$argv" \
					'https://jerl.zone/contact' > /dev/null
			'' ;
		} ;
		shellAbbrs = {
			gs  = "git status"                     ;
			gc  = "git commit"                     ;
			gca = "git commit --amend"             ;
			ga  = "git add"                        ;
			gaa = "git add -A"                     ;
			gse = "git send-email HEAD^ --to=\"\"" ;
			gd  = "git diff"                       ;
			gP  = "git push"                       ;
			gp  = "git pull"                       ;
			gl  = "git log '@{push}..'"            ;
			gla = "git log"                        ;
		} ;
		shellAliases = {
			l    = "ls -CB"    ;
			la   = "ls -CAB"   ;
			ll   = "ls -CBlh"  ;
			lla  = "ls -CABlh" ;
			cl   = "clear"     ;
			"c." = "cd .."     ;
			":q" = "exit"      ;
			v    = "hx"        ;
			sv   = "sudo hx"   ;
		} ;
	} ;
}