// cmds: handles system commands
package cmds

import "strings"

// Eval: evaluates a provided string into a command
// if it can't find the command or the arguments are incorrect
// returns an error
func Eval(cmd string) error {
	args := strings.Split(cmd, " ")
	switch args[0] {
	case "cd":
		if err := chDir(args); err != nil {
			return err
		}
		break
	case "export":
		if err := export(args); err != nil {
			return err
		}
		break
	case "unset":
		if err := unset(args); err != nil {
			return err
		}
		break
	case "set":
		if len(args) > 1 {
			set(args)
		} else {
			printEnv()
		}
		break
	case "exit":
		if err := exit(args); err != nil {
			return err
		}
		break
	case ":":
		return nil
	}
	return nil
}