xgoprev/xmodules/paths/main.go

package paths

import (
	"github.com/d5/tengo/v2"
	"path"
)

var Module = map[string] tengo.Object {
	"base" : &tengo.UserFunction{
		Name: "base",
		Value: wrapOneArg(path.Base),
	},
	"ext" : &tengo.UserFunction{
		Name: "ext",
		Value: wrapOneArg(path.Ext),
	},
	"dir" : &tengo.UserFunction{
		Name: "dir",
		Value: wrapOneArg(path.Dir),
	},
	"clean" : &tengo.UserFunction{
		Name: "clean",
		Value: wrapOneArg(path.Clean),
	},
}

func wrapOneArg(
	fn func(string) string,
) func(...tengo.Object) (tengo.Object, error) {
	return func(args ...tengo.Object) (tengo.Object, error) {
		if len(args) != 1 {
			return nil, tengo.ErrWrongNumArguments
		}
		str, ok := tengo.ToString(args[0])
		if !ok {
			return nil, tengo.ErrInvalidArgumentType{
				Name: "first",
				Expected: "string(compatible)",
				Found: args[0].TypeName(),
			}
		}
		return &tengo.String{
			Value: fn(str),
		}, nil
	}
}