Factor out a "command head" from eval.command
Factor out a "command head" from eval.command

elves/elvish,ke7ofi/elvish,elves/elvish,ke7ofi/elvish,CodyGuo/elvish,elves/elvish,elves/elvish,elves/elvish,CodyGuo/elvish,beni55/elvish,beni55/elvish