Add fish config

config/fish/functions/prompt_pwd.fish

@@ -0,0 +1,16 @@
+function prompt_pwd --description 'Print the current working directory'
+	set -l options 'h/help'
+	argparse -n prompt_pwd --max-args=0 $options -- $argv
+	or return
+
+	if set -q _flag_help
+		__fish_print_help prompt_pwd
+		return 0
+	end
+
+	# Replace $HOME with "~"
+	set realhome ~
+	set -l tmp (string replace -r '^'"$realhome"'($|/)' '~$1' $PWD)
+
+	basename $tmp
+end