wip: running interface in separate or combined mode

also disassociating render functions from state structs

src/render.rs

@@ -0,0 +1,41 @@
+use crate::prelude::*;
+
+pub fn render_toolbar_vertical (
+    stdout:  &mut std::io::Stdout,
+    offset:  (u16, u16),
+    actions: &[(&str, &str)],
+) -> Result<(u16, u16), Box<dyn Error>> {
+    use crossterm::{*, style::{Stylize, PrintStyledContent}, cursor::MoveTo};
+    let move_to = |col, row| MoveTo(offset.0 + col, offset.1 + row);
+    let mut x: u16 = 1;
+    let mut y: u16 = 0;
+    for (name, description) in actions.iter() {
+        stdout.queue(move_to(1, y))?.queue(
+            PrintStyledContent(name.yellow().bold())
+        )?.queue(move_to(1, y + 1))?.queue(
+            PrintStyledContent(description.yellow())
+        )?;
+        y = y + 3;
+        x = u16::max(x, usize::max(name.len(), description.len()) as u16);
+    }
+    Ok((x, y))
+}
+
+pub fn render_box (
+    stdout: &mut std::io::Stdout,
+    x: u16,
+    y: u16,
+    w: u16,
+    h: u16,
+    active: bool
+) -> Result<(), Box<dyn Error>> {
+    let edge: String = std::iter::repeat("─").take(w.saturating_sub(2) as usize).collect();
+    let back: String = std::iter::repeat(" ").take(w.saturating_sub(2) as usize).collect();
+    stdout.queue(MoveTo(x, y))?.queue(Print(&format!("┌{edge}┐")))?;
+    for row in y+1..y+h {
+        stdout.queue(MoveTo(x, row))?.queue(Print("│"))?;
+        stdout.queue(MoveTo(x+w-1, row))?.queue(Print("│"))?;
+    }
+    stdout.queue(MoveTo(x, y+h))?.queue(Print(&format!("└{edge}┘")))?;
+    Ok(())
+}