alias_helpers.zsh

# alias a command only if the alias name isn't a command
weak_alias () {
  if [[ -z "`whence ${1[(ws:=:)1]}`" ]]; then
    alias $1
  fi
}

# alias a command only if the alias target exists
alias_if_exist () {
  if [[ -n "`whence ${1[(ws:=:)2]}`" ]]; then
    alias $1
  fi 
}