package template

import (
	"net/url"
	"path/filepath"
	"strings"
)

// returns a url string of the base and a relative path.
// e.g. http://host/foo/bar/baz, ./boo.tpl gives http://host/foo/bar/boo.tpl
func getURL(root, rel string) (string, error) {

	// handle the case when rel is actually a full url
	if strings.Index(rel, "://") > 0 {
		u, err := url.Parse(rel)
		if err != nil {
			return "", err
		}
		return u.String(), nil
	}

	u, err := url.Parse(root)
	if err != nil {
		return "", err
	}
	u.Path = filepath.Clean(filepath.Join(filepath.Dir(u.Path), rel))
	return u.String(), nil
}