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|
use textmode::Textmode as _;
use unicode_width::{UnicodeWidthChar as _, UnicodeWidthStr as _};
pub struct Readline {
size: (u16, u16),
prompt: String,
input_line: String,
pos: usize,
action: async_std::channel::Sender<crate::action::Action>,
}
impl Readline {
pub fn new(
action: async_std::channel::Sender<crate::action::Action>,
) -> Self {
Self {
size: (24, 80),
prompt: "$ ".into(),
input_line: "".into(),
pos: 0,
action,
}
}
pub async fn handle_key(&mut self, key: textmode::Key) -> bool {
match key {
textmode::Key::String(s) => self.add_input(&s),
textmode::Key::Char(c) => {
self.add_input(&c.to_string());
}
textmode::Key::Ctrl(b'c') => self.clear_input(),
textmode::Key::Ctrl(b'd') => {
return true;
}
textmode::Key::Ctrl(b'm') => {
self.action
.send(crate::action::Action::Run(self.input()))
.await
.unwrap();
self.clear_input();
}
textmode::Key::Ctrl(b'u') => self.clear_backwards(),
textmode::Key::Backspace => self.backspace(),
textmode::Key::Left => self.cursor_left(),
textmode::Key::Right => self.cursor_right(),
_ => {}
}
self.action
.send(crate::action::Action::Render)
.await
.unwrap();
false
}
pub fn lines(&self) -> usize {
1 // XXX handle wrapping, multiline prompts
}
pub async fn render(
&self,
out: &mut textmode::Output,
) -> anyhow::Result<()> {
out.move_to(self.size.0 - 1, 0);
out.write_str(&self.prompt);
out.write_str(&self.input_line);
out.move_to(self.size.0 - 1, self.prompt_width() + self.pos_width());
Ok(())
}
pub async fn resize(&mut self, size: (u16, u16)) {
self.size = size;
}
fn input(&self) -> String {
self.input_line.clone()
}
fn add_input(&mut self, s: &str) {
self.input_line.insert_str(self.byte_pos(), s);
self.pos += s.chars().count();
}
fn backspace(&mut self) {
while self.pos > 0 {
self.pos -= 1;
let width =
self.input_line.remove(self.byte_pos()).width().unwrap_or(0);
if width > 0 {
break;
}
}
}
fn clear_input(&mut self) {
self.input_line.clear();
self.pos = 0;
}
fn clear_backwards(&mut self) {
self.input_line = self.input_line.chars().skip(self.pos).collect();
self.pos = 0;
}
fn cursor_left(&mut self) {
if self.pos == 0 {
return;
}
self.pos -= 1;
while let Some(c) = self.input_line.chars().nth(self.pos) {
if c.width().unwrap_or(0) == 0 {
self.pos -= 1;
} else {
break;
}
}
}
fn cursor_right(&mut self) {
if self.pos == self.input_line.chars().count() {
return;
}
self.pos += 1;
while let Some(c) = self.input_line.chars().nth(self.pos) {
if c.width().unwrap_or(0) == 0 {
self.pos += 1;
} else {
break;
}
}
}
fn prompt_width(&self) -> u16 {
self.prompt.width().try_into().unwrap()
}
fn pos_width(&self) -> u16 {
self.input_line
.chars()
.take(self.pos)
.collect::<String>()
.width()
.try_into()
.unwrap()
}
fn byte_pos(&self) -> usize {
self.input_line
.char_indices()
.nth(self.pos)
.map_or(self.input_line.len(), |(i, _)| i)
}
}
|
