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|
use std::str::FromStr;
use ratatui::{
crossterm::event::{KeyCode, KeyEvent},
prelude::BlockExt,
style::Stylize,
text::ToSpan,
widgets::{Block, Widget},
};
pub mod buffer;
pub mod cursor;
use buffer::Buffer;
use self::cursor::CursorMove;
#[derive(Debug)]
pub struct LuaEditor<'a> {
block: Option<Block<'a>>,
scroll: usize,
buffer: Buffer,
}
impl<'a> LuaEditor<'a> {
pub fn new<S>(content: S) -> Self
where
S: AsRef<str>,
{
Self {
block: None,
scroll: 0,
buffer: Buffer::from_str(content.as_ref()).unwrap(),
}
}
pub fn block(mut self, block: Option<Block<'a>>) -> Self {
self.block = block;
self
}
pub fn handle_key_event(&mut self, event: KeyEvent) {
match event.code {
KeyCode::Char(c) => self.buffer.insert(c),
KeyCode::Backspace => {
self.buffer.delete();
}
KeyCode::Enter => {
self.buffer.insert('\n');
}
KeyCode::Left => self.buffer.move_cursor(CursorMove::Left(1)),
KeyCode::Right => self.buffer.move_cursor(CursorMove::Right(1)),
KeyCode::Up => self.buffer.move_cursor(CursorMove::Up(1)),
KeyCode::Down => self.buffer.move_cursor(CursorMove::Down(1)),
KeyCode::Home => {}
KeyCode::End => {}
KeyCode::PageUp => {}
KeyCode::PageDown => {}
KeyCode::Tab => self.buffer.insert('\t'),
KeyCode::BackTab => {}
KeyCode::Delete => {}
KeyCode::Insert => {}
KeyCode::F(_) => {}
KeyCode::Null => {}
KeyCode::Esc => {}
KeyCode::CapsLock => {}
KeyCode::ScrollLock => {}
KeyCode::NumLock => {}
KeyCode::PrintScreen => {}
KeyCode::Pause => {}
KeyCode::Menu => {}
KeyCode::KeypadBegin => {}
KeyCode::Media(_) => {}
KeyCode::Modifier(_) => {}
}
}
pub fn text(&self) -> String {
self.buffer.lines().join("\n")
}
}
impl Widget for &mut LuaEditor<'_> {
fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
where
Self: Sized,
{
self.block.render(area, buf);
let inner_area = self.block.inner_if_some(area);
for (i, line) in self.buffer.lines().iter().enumerate().skip(self.scroll) {
let replace = &line.replace('\t', " ");
let span = replace.to_span();
let mut span_area = inner_area.clone();
span_area.height = 1;
span_area.y += i as u16;
if !inner_area.contains(span_area.into()) {
break;
}
span.render(span_area, buf)
}
let mut cursor_area = inner_area.clone();
cursor_area.width = 1;
cursor_area.height = 1;
cursor_area.y += self.buffer.cursor().y() as u16;
cursor_area.x += self.buffer.cursor().x() as u16;
let (first, _) = self
.buffer
.current_line()
.split_at(self.buffer.cursor().x() as usize);
for c in first.chars() {
if c == '\t' {
cursor_area.x += 1;
}
}
self.buffer
.current_line()
.chars()
.nth(self.buffer.cursor().x() as usize)
.map(|c| if c == '\t' { ' ' } else { c })
.unwrap_or(' ')
.to_span()
.reversed()
.render(cursor_area, buf);
}
}
|
