Struct SharedPrinterSlot 

pub struct SharedPrinterSlot { /* private fields */ }

Shared slot holding an optional [NonBlockingPrinter].

Created before tracing subscriber init, shared with both the tracing MakeWriter and OrcsApp.

• Printer set → tracing and IOOutput go through NonBlockingPrinter (preserves rustyline prompt, never blocks)
• Printer empty → fallback to stderr (startup, shutdown, non-interactive)

Implementations

impl SharedPrinterSlot

pub fn new() -> Self

Creates an empty slot (no printer attached).

pub fn set(&self, printer: Box<dyn ExternalPrinter + Send>)

Installs an ExternalPrinter into the slot, wrapped in a [NonBlockingPrinter] for deadlock-free operation.

All subsequent try_print() calls will route through this printer.

pub fn clear(&self)

Removes the printer from the slot.

The [NonBlockingPrinter] is dropped, which drops the SyncSender, causing the drain thread to exit cleanly.

pub fn try_print(&self, msg: String) -> PrintResult

Attempts to print a message through the non-blocking printer.

Returns PrintResult indicating the outcome:

• Sent — enqueued for terminal display
• NoPrinter — no printer installed
• Dropped — channel full, message dropped

Trait Implementations

impl Clone for SharedPrinterSlot

fn clone(&self) -> SharedPrinterSlot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for SharedPrinterSlot

fn default() -> Self

Returns the “default value” for a type.