WIP: Add building blocks for rendering

src/ui.rs

@@ -1,7 +1,73 @@
+use crate::fitch::Fitch;
+use ratatui::{
+    backend::CrosstermBackend,
+    layout::{Constraint, Direction, Layout, Rect},
+    widgets::{Block, BorderType, Borders, Paragraph},
+    Terminal,
+};
 use std::io::Stdout;
 
-use ratatui::{backend::CrosstermBackend, Terminal};
+const INFO_AREA_HEIGHT: u16 = 3;
 
 pub struct Renderer {
     terminal: Terminal<CrosstermBackend<Stdout>>,
 }
+
+impl Renderer {
+    fn render_fitch(&mut self, model: &Fitch) {
+        self.terminal
+            .draw(|frame| {
+                let (f_a, i_a) = base_area(frame.size());
+                let fitch_widget = Paragraph::new(model.to_string()).block(
+                    Block::default()
+                        .borders(Borders::ALL)
+                        .border_type(BorderType::Rounded),
+                );
+                let info_widget = Paragraph::new(info_text());
+
+                frame.render_widget(fitch_widget, f_a);
+                frame.render_widget(info_widget, i_a);
+            })
+            .unwrap();
+    }
+}
+
+fn info_text() -> String {
+    // TODO fill info array
+    let info = [""];
+    info.iter().fold(String::new(), |mut acc, inf| {
+        acc.push_str(inf);
+        acc
+    })
+}
+
+fn base_area(whole: Rect) -> (Rect, Rect) {
+    let temp = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(whole.height - INFO_AREA_HEIGHT),
+            Constraint::Length(INFO_AREA_HEIGHT),
+        ])
+        .split(whole);
+
+    (temp[0], temp[1])
+}
+
+fn expression_box_area(whole: Rect) -> Rect {
+    let temp = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(whole.height / 2 - 1),
+            Constraint::Length(1),
+            Constraint::Length(whole.height / 2),
+        ])
+        .split(whole)[1];
+    Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([
+            Constraint::Percentage(18),
+            Constraint::Percentage(64),
+            Constraint::Percentage(18),
+        ])
+        .split(temp)[1]
+}