package knit

import (
	"errors"
	"os"
	"os/exec"
)

// DefaultHost is the default host for tangled.sh services
const DefaultHost = "tangled.sh"

// DefaultKnot is the default knot host
const DefaultKnot = "knot1.tangled.sh"

// ErrRequiresAuth is returned when a command requires authentication but the
// user has not authenticated with the host
var ErrRequiresAuth = errors.New("authentication required")

func Editor() string {
	e := os.Getenv("EDITOR")
	if e != "" {
		return e
	}

	options := []string{"nvim", "vim", "nano"}
	for _, opt := range options {
		_, err := exec.LookPath(opt)
		if err != nil {
			continue
		}
		return opt
	}

	return "vi"
}