You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: uri.go
    path of file: ./repos/fyne/storage/repository
    
    the code of the file until where you have to start completion: package repository

import (
	"bufio"
	"mime"
	"path/filepath"
	"strings"
	"unicode/utf8"

	"fyne.io/fyne/v2"
)

// Declare conformance with fyne.URI interface.
var _ fyne.URI = &uri{}

type uri struct {
	scheme    string
	authority string
	path      string
	query     string
	fragment  string
}

func (u *uri) Extension() string {
	return filepath.Ext(u.path)
}

func (u *uri) Name() string {
	return filepath.Base(u.path)
}

func (u *uri) MimeType() string {
	mime
    
func (u *uri) MimeType() string {
	mimeTypeFull := mime.TypeByExtension(u.Extension())
	if mimeTypeFull == "" {
		mimeTypeFull = "text/plain"

		repo, err := ForURI(u)
		if err != nil {
			return "application/octet-stream"
		}

		readCloser, err := repo.Reader(u)
		if err == nil {
			defer readCloser.Close()
			scanner := bufio.NewScanner(readCloser)
			if scanner.Scan() && !utf8.Valid(scanner.Bytes()) {
				mimeTypeFull = "application/octet-stream"
			}
		}
	}

	// Replace with strings.Cut() when Go 1.18 is our new base version.
	semicolonIndex := strings.IndexByte(mimeTypeFull, ';')
	if semicolonIndex == -1 {
		return mimeTypeFull
	}
	return mimeTypeFull[:semicolonIndex]
}