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use dialoguer::{theme::ColorfulTheme, History, Input};
use std::{collections::VecDeque, process};
fn main() {
println!("Use 'exit' to quit the prompt");
println!("In this example, history is limited to 4 entries");
println!("Use the Up/Down arrows to scroll through history");
println!();
let mut history = MyHistory::default();
loop {
if let Ok(cmd) = Input::<String>::with_theme(&ColorfulTheme::default())
.with_prompt("dialoguer")
.history_with(&mut history)
.interact_text()
{
if cmd == "exit" {
process::exit(0);
}
println!("Entered {}", cmd);
}
}
}
struct MyHistory {
max: usize,
history: VecDeque<String>,
}
impl Default for MyHistory {
fn default() -> Self {
MyHistory {
max: 4,
history: VecDeque::new(),
}
}
}
impl<T: ToString> History<T> for MyHistory {
fn read(&self, pos: usize) -> Option<String> {
self.history.get(pos).cloned()
}
fn write(&mut self, val: &T) {
if self.history.len() == self.max {
self.history.pop_back();
}
self.history.push_front(val.to_string());
}
}
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