embed

Extract the file from the embed path (src) to the output path (dst).

outputFilePath := "./output.txt"
if err := ExtractFile(&embedBuildBat, "testData/hello.txt", outputFilePath); err != nil {
	panic(err)
}
if _, err := os.Stat(outputFilePath); os.IsNotExist(err) {
	panic(err)
}
defer func() {
	if err := os.Remove(outputFilePath); err != nil {
		panic(err)
	}
}()
f, _ := os.Open(outputFilePath)
defer f.Close()
dataBytes, _ := io.ReadAll(f)
fmt.Println(string(dataBytes))

Output:

Hello World!

outputFilePath := "./output.txt"
if err := PromiseExtractFile(&embedBuildBat, "testData/hello.txt", outputFilePath,
	func(dst string) error {
		f, _ := os.Open(dst)
		dataBytes, _ := io.ReadAll(f)
		_ = f.Close()
		fmt.Println(string(dataBytes))
		return os.Remove(outputFilePath)
	}, nil); err != nil {
	panic(err)
}

if err := PromiseExtractFile(&embedBuildBat, "not_exist_file.txt", outputFilePath,
	nil, func(err error) error {
		fmt.Println("got an error")
		return err
	}); err == nil {
	panic(err)
}

Output:

Hello World!
got an error