feat: config file, cloes #47

Enable use of a config file, with custom keymap and custom colours

src/ui/draw_blocks/popup.rs

@@ -0,0 +1,31 @@
+use ratatui::layout::{Direction, Layout, Rect};
+
+use crate::ui::gui_state::BoxLocation;
+
+/// draw a box in the one of the BoxLocations, based on max line width + number of lines
+pub fn draw(text_lines: usize, text_width: usize, r: Rect, box_location: BoxLocation) -> Rect {
+    // Make sure blank_space can't be an negative, as will crash
+    let calc = |x: u16, y: usize| usize::from(x).saturating_sub(y).saturating_div(2);
+
+    let blank_vertical = calc(r.height, text_lines);
+    let blank_horizontal = calc(r.width, text_width);
+
+    let (h_constraints, v_constraints) = box_location.get_constraints(
+        blank_horizontal.try_into().unwrap_or_default(),
+        blank_vertical.try_into().unwrap_or_default(),
+        text_lines.try_into().unwrap_or_default(),
+        text_width.try_into().unwrap_or_default(),
+    );
+
+    let indexes = box_location.get_indexes();
+
+    let popup_layout = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints(v_constraints)
+        .split(r);
+
+    Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints(h_constraints)
+        .split(popup_layout[indexes.0])[indexes.1]
+}