{
:read_all
:with_output_file
}

Where

Define (read_all file_name)
    Begin {
        Let fd (OS.file_open file_name)
        Let text (OS.file_read_all fd)
        (OS.file_close fd)
        text
    }

Define (with_output_file file_name func)
    Begin {
        Let file (OS.file_create file_name)
        (func file)
        (OS.file_close file)
    }

Where

Let OS Package "os"