Struct FdReader 

pub struct FdReader { /* private fields */ }

Input function that reads from a file descriptor.

An instance of FdReader contains a SharedSystem to interact with the file descriptor.

Although FdReader implements Clone, it does not mean you can create and keep a copy of a FdReader instance to replay the input later. Since both the original and clone share the same SharedSystem, reading a line from one instance will affect the next read from the other.

Implementations

impl FdReader

pub fn new(fd: Fd, system: SharedSystem) -> Self

Creates a new FdReader instance.

The fd argument is the file descriptor to read from. It should be readable, have the close-on-exec flag set, and remain open for the lifetime of the FdReader instance.

pub fn set_echo(&mut self, echo: Option<Rc<Cell<State>>>)

👎Deprecated: use Echo instead

Sets the “echo” flag.

You can use this setter function to set a shared option state that controls whether the input function echoes lines it reads to the standard error. If echo is None or some shared cell containing Off, the function does not echo. If a cell has On, the function prints every line it reads to the standard error.

This option implements the behavior of the verbose shell option. You can change the state of the shared cell through the lifetime of the input function to reflect the option dynamically changed, which will affect the next next_line call.

Deprecation

This function is deprecated in favor of the Echo struct.

Trait Implementations

impl Clone for FdReader

fn clone(&self) -> FdReader

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FdReader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Input for FdReader

async fn next_line(&mut self, _context: &Context) -> Result

Reads a next line of the source code.