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use anyhow::Result;
use crossterm::event::{self, Event, KeyCode, KeyEvent, KeyModifiers};
use crossterm::terminal::{disable_raw_mode, enable_raw_mode};
use std::io::{Write, stdout};
/// Reads a single character from stdin without requiring Enter
/// Returns the character if it's one of the valid options, or the default if Enter is pressed
pub fn read_single_key(valid_chars: &[char], default: char, prompt: &str) -> Result<char> {
print!("{prompt}");
stdout().flush()?;
enable_raw_mode()?;
let result = loop {
if let Ok(Event::Key(KeyEvent {
code, modifiers, ..
})) = event::read()
{
match code {
KeyCode::Char('c') if modifiers.contains(KeyModifiers::CONTROL) => {
break Err(anyhow::anyhow!("Interrupted"));
}
KeyCode::Char(c) if valid_chars.contains(&c) => {
// Invalid character, continue loop
break Ok(c);
}
KeyCode::Enter => {
break Ok(default);
}
_ => {
// Other keys are ignored, continue loop
}
}
}
};
disable_raw_mode()?;
// Print the chosen character and newline for clean output
if let Ok(chosen) = &result {
println!("{chosen}");
}
result
}