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use std::io::Write;
use termion::event::Key;
#[derive(Debug, Default)]
pub struct Editor {
s: String,
left: usize,
cursor: usize,
wid: usize,
}
impl Editor {
pub fn keypress(&mut self, key: Key) -> Option<String> {
let mut ret = None;
match key {
Key::Char('\n') => {
ret = Some(String::new());
std::mem::swap(ret.as_mut().unwrap(), &mut self.s);
self.cursor = 0;
}
Key::Char(c) if !c.is_control() => {
self.s.insert(self.cursor, c);
self.cursor += 1;
}
Key::Backspace if self.cursor > 0 => {
self.cursor -= 1;
self.s.remove(self.cursor);
}
Key::Delete if self.s.len() > self.cursor => {
self.s.remove(self.cursor);
}
Key::Home | Key::Ctrl('a') => {
self.cursor = 0;
}
Key::End | Key::Ctrl('e') => {
self.cursor = self.s.len();
}
Key::Left | Key::Ctrl('b') if self.cursor > 0 => {
self.cursor -= 1;
}
Key::Right | Key::Ctrl('f') if self.cursor < self.s.len() => {
self.cursor += 1;
}
Key::Ctrl('u') => {
self.s.replace_range(0..self.cursor, "");
self.cursor = 0;
}
_ => {
print!("\x07");
std::io::stdout().flush().unwrap();
}
};
self.fix_left();
ret
}
pub fn set_wid(&mut self, wid: usize) {
self.wid = wid;
self.fix_left();
}
pub fn displayed(&self) -> (&str, usize) {
let endidx = (self.left + self.wid).min(self.s.len());
(&self.s[self.left .. endidx], self.cursor - self.left)
}
fn fix_left(&mut self) {
self.left = self.left.min(self.cursor).max(self.cursor + 1 - self.wid.min(self.cursor + 1));
}
}
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