diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5cd0555
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,275 @@
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diff --git a/Cargo.toml b/Cargo.toml
index f3d3b09..68cc295 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,6 @@ name = "breed"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
+crossterm = "0.26"
+ropey = "1.6"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..e78fe10 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,266 @@
-fn main() {
-    println!("Hello, world!");
+use std::io::{stdin, stdout, Read, Write};
+
+use crossterm::{cursor, event, terminal, ExecutableCommand, Result};
+use event::{Event, KeyCode, KeyEvent};
+use ropey::Rope;
+
+struct Buffer {
+    pub text: Rope,
+}
+
+impl Buffer {
+    pub fn from_str(text: &str) -> Self {
+        Self {
+            text: Rope::from_str(text),
+        }
+    }
+
+    pub fn draw(&self, out: &mut (impl ExecutableCommand + Write)) -> Result<u32> {
+        let (cols, rows) = terminal::size()?;
+        let lr_width = self.text.len_lines().ilog10() + 1;
+
+        out.execute(cursor::MoveTo(0, 0))?;
+
+        for (row, line) in (0..rows).zip(self.text.lines()) {
+            write!(out, "{:width$} ", row, width = lr_width as usize)?;
+            write!(out, "{}", line.as_str().unwrap_or("").trim_end())?;
+            out.execute(cursor::MoveToNextLine(1))?;
+        }
+
+        Ok(lr_width + 1)
+    }
+
+    pub fn clamped_cursor(&self, cursor: Cursor) -> Cursor {
+        Cursor {
+            line: cursor.line,
+            column: cursor
+                .column
+                .min(self.text.line(cursor.line).len_chars() - 1),
+        }
+    }
+
+    pub fn cursor_to_char(&self, cursor: Cursor) -> usize {
+        let cursor = self.clamped_cursor(cursor);
+        self.text.line_to_char(cursor.line) + cursor.column
+    }
+
+    pub fn move_cursor(&self, cursor: &mut Cursor, direction: Direction, enable_linewrap: bool) {
+        *cursor = self.clamped_cursor(*cursor);
+        match direction {
+            Direction::Left => {
+                if cursor.column > 0 {
+                    cursor.column -= 1;
+                } else if enable_linewrap && cursor.line > 0 {
+                    cursor.line -= 1;
+                    let line = self.text.line(cursor.line);
+                    cursor.column = line.len_chars() - 1;
+                }
+            }
+            Direction::Down => {
+                if cursor.line < self.text.len_lines() {
+                    cursor.line += 1;
+                }
+            }
+            Direction::Up => {
+                if cursor.line > 0 {
+                    cursor.line -= 1;
+                }
+            }
+            Direction::Right => {
+                let line = self.text.line(cursor.line);
+                if cursor.column + 2 > line.len_chars() {
+                    if enable_linewrap && cursor.line < self.text.len_lines() {
+                        cursor.line += 1;
+                        cursor.column = 0;
+                    }
+                } else {
+                    cursor.column += 1;
+                }
+            }
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, Default)]
+struct Cursor {
+    pub column: usize,
+    pub line: usize,
+}
+
+#[derive(Copy, Clone, Debug, Default)]
+enum Mode {
+    #[default]
+    Normal,
+    Command,
+    Visual,
+    Insert,
+}
+
+impl Mode {
+    pub fn cursor_style(&self) -> cursor::SetCursorStyle {
+        use cursor::SetCursorStyle as Style;
+        match self {
+            Mode::Normal => Style::SteadyBlock,
+            Mode::Visual => Style::BlinkingBlock,
+            Mode::Insert => Style::BlinkingBar,
+            Mode::Command => Style::SteadyUnderScore,
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+enum Direction {
+    Left,
+    Down,
+    Up,
+    Right,
+}
+
+struct State {
+    pub buffer: Buffer,
+    pub cursor: Cursor,
+    pub mode: Mode,
+    pub quit: bool,
+}
+
+impl State {
+    pub fn from_str(text: &str) -> Self {
+        Self {
+            buffer: Buffer::from_str(text),
+            cursor: Cursor::default(),
+            mode: Mode::default(),
+            quit: false,
+        }
+    }
+
+    pub fn draw(&self, out: &mut impl Write) -> Result<()> {
+        out.execute(terminal::BeginSynchronizedUpdate)?;
+        out.execute(terminal::Clear(terminal::ClearType::All))?;
+        let lr_width = self.buffer.draw(out)?;
+        let cursor = self.buffer.clamped_cursor(self.cursor);
+        let (col, row) = (cursor.column as u16, cursor.line as u16);
+        let col = col + lr_width as u16;
+        out.execute(cursor::MoveTo(col, row))?;
+        out.execute(self.mode.cursor_style())?;
+        out.execute(terminal::EndSynchronizedUpdate)?;
+        Ok(())
+    }
+
+    pub fn on_event(&mut self, event: Event) {
+        match self.mode {
+            Mode::Normal => self.on_normal_event(event),
+            Mode::Command => self.on_command_event(event),
+            Mode::Visual => self.on_visual_event(event),
+            Mode::Insert => self.on_insert_event(event),
+        }
+    }
+
+    fn on_normal_event(&mut self, event: Event) {
+        match event {
+            Event::Key(KeyEvent { code, .. }) => match code {
+                KeyCode::Char('i') => {
+                    self.mode = Mode::Insert;
+                }
+                KeyCode::Char(':') => {
+                    self.mode = Mode::Command;
+                }
+                KeyCode::Char('v') => {
+                    self.mode = Mode::Visual;
+                }
+                KeyCode::Esc => {
+                    self.quit = true;
+                }
+                code => self.match_any_key(code),
+            },
+            _ => {}
+        }
+    }
+
+    fn on_command_event(&mut self, event: Event) {
+        match event {
+            Event::Key(KeyEvent { code, .. }) => match code {
+                KeyCode::Esc => {
+                    self.mode = Mode::Normal;
+                }
+                code => self.match_any_key(code),
+            },
+            _ => {}
+        }
+    }
+
+    fn on_visual_event(&mut self, event: Event) {
+        match event {
+            Event::Key(KeyEvent { code, .. }) => match code {
+                KeyCode::Esc => {
+                    self.mode = Mode::Normal;
+                }
+                code => self.match_any_key(code),
+            },
+            _ => {}
+        }
+    }
+
+    fn on_insert_event(&mut self, event: Event) {
+        match event {
+            Event::Key(KeyEvent { code, .. }) => match code {
+                KeyCode::Char(c) => {
+                    let index = self.buffer.cursor_to_char(self.cursor);
+                    self.buffer.text.insert_char(index, c);
+                    self.move_cursor(Direction::Right)
+                }
+                KeyCode::Backspace => {
+                    self.move_cursor(Direction::Left);
+                    let index = self.buffer.cursor_to_char(self.cursor);
+                    self.buffer.text.remove(index..=index);
+                }
+                KeyCode::Delete => {
+                    let index = self.buffer.cursor_to_char(self.cursor);
+                    self.buffer.text.remove(index..=index);
+                }
+                KeyCode::Enter => {
+                    let index = self.buffer.cursor_to_char(self.cursor);
+                    self.buffer.text.insert_char(index, '\n');
+                    self.cursor.line += 1;
+                    self.cursor.column = 0;
+                }
+                KeyCode::Esc => {
+                    self.mode = Mode::Normal;
+                }
+                code => self.match_any_key(code),
+            },
+            _ => {}
+        }
+    }
+
+    fn match_any_key(&mut self, code: KeyCode) {
+        match code {
+            KeyCode::Esc => self.mode = Mode::Normal,
+            KeyCode::Char('h') | KeyCode::Left => self.move_cursor(Direction::Left),
+            KeyCode::Char('j') | KeyCode::Down => self.move_cursor(Direction::Down),
+            KeyCode::Char('k') | KeyCode::Up => self.move_cursor(Direction::Up),
+            KeyCode::Char('l') | KeyCode::Right => self.move_cursor(Direction::Right),
+            _ => {}
+        }
+    }
+
+    fn move_cursor(&mut self, direction: Direction) {
+        self.buffer.move_cursor(&mut self.cursor, direction, true);
+    }
+}
+
+fn main() -> Result<()> {
+    let text = include_str!("main.rs");
+    let mut state = State::from_str(text);
+    let mut stdout = stdout();
+    terminal::enable_raw_mode()?;
+    stdout.execute(terminal::EnterAlternateScreen)?;
+
+    while !state.quit {
+        state.draw(&mut stdout)?;
+        let event = event::read()?;
+        state.on_event(event);
+    }
+
+    stdout.execute(terminal::LeaveAlternateScreen)?;
+    Ok(())
 }