Struct HeadlessIo 

pub struct HeadlessIo {
    pub output: Vec<String>,
    /* private fields */
}

A NarjuIo that reads from a pre-set script and writes to a buffer.

read_line pops the next scripted line, then reports EOF forever; print appends to output (and, if constructed via new_shared, to a shared sink readable after the box has been consumed).

Fields

output: Vec<String>

Everything printed so far, one entry per print call.

Implementations

impl HeadlessIo

pub fn new(input: Vec<String>) -> Self

Construct with the given input script and an empty output buffer.

pub fn empty() -> Self

Construct with no input at all: read_line reports EOF immediately. Sufficient for code that never calls read.

pub fn new_shared(input: Vec<String>) -> (Self, Rc<RefCell<Vec<String>>>)

Like new, but also returns a shared handle to the print output, so callers can read what a session printed after the Box<dyn NarjuIo> has been consumed by TopLevel/EvalCtx.

pub fn drain_output(&mut self) -> Vec<String>

Take everything printed so far, leaving the buffer empty.

Trait Implementations

impl NarjuIo for HeadlessIo

fn read_line(&mut self, _prompt: &str) -> Result<Option<String>, NarjuError>

Read one line of input, displaying prompt where that makes sense. Returns Ok(None) at end of input (EOF, Ctrl-D, or an exhausted script), which the floor’s read maps to nil.

fn print(&mut self, s: &str) -> Result<(), NarjuError>

Write one line of output (no trailing newline in s; the implementation supplies it).