Reading a UTF-8 file

read_text(path) opens, reads, and closes a file, returning Result[str, IoError]. It requires Linux and strict UTF-8, translating CRLF and bare CR to LF. Paths are relative to the process working directory. The handle closes even when reading or allocating fails.

The &str parameter borrows literals and bindings implicitly; configuration(&path) is also valid.

def configuration(path: &str) -> Result[str, IoError]:
    read_text(path)

def main() -> Result[(), IoError]:
    write_text("configuration.txt", "mode=fast\n")?
    print(configuration("configuration.txt")?)?
    path = "configuration.txt"
    print(configuration(path)?)?
    Ok(())

mode=fast

mode=fast