1 files changed, 132 insertions, 0 deletions
diff --git a/src/widgets/luaeditor/mod.rs b/src/widgets/luaeditor/mod.rs
new file mode 100644
index 0000000..723d8b5
--- /dev/null
+++ b/src/widgets/luaeditor/mod.rs
@@ -0,0 +1,132 @@
+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);
+    }
+}