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use rustyline::{
Cmd, ConditionalEventHandler, DefaultEditor, Event, EventContext, EventHandler, KeyCode,
KeyEvent, Modifiers, RepeatCount, Result,
};
struct FilteringEventHandler;
impl ConditionalEventHandler for FilteringEventHandler {
fn handle(&self, evt: &Event, _: RepeatCount, _: bool, _: &EventContext) -> Option<Cmd> {
if let Some(KeyEvent(KeyCode::Char(c), m)) = evt.get(0) {
if m.contains(Modifiers::CTRL) || m.contains(Modifiers::ALT) || c.is_ascii_digit() {
None
} else {
Some(Cmd::Noop) // filter out invalid input
}
} else {
None
}
}
}
fn main() -> Result<()> {
let mut rl = DefaultEditor::new()?;
rl.bind_sequence(
Event::Any,
EventHandler::Conditional(Box::new(FilteringEventHandler)),
);
loop {
let line = rl.readline("> ")?;
println!("Num: {line}");
}
}
|
