bind-key C-d split-window "pmenu"
# for horisontal split use
# bind-key C-d split-window -h "pmenu"`
(or anywhere on your $PATH)
#!/usr/bin/env zsh
command=$(echo $PATH | tr ':' ' ' | xargs -n1 ls -1 | sort | uniq | peco | xargs -n 1 which)
exec "$command"