52 lines
1.2 KiB
Rust
52 lines
1.2 KiB
Rust
|
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());
|
||
|
|
}
|
||
|
|
}
|