feat: add cursor and item rendering with colors

src/App.py

@@ -16,6 +16,7 @@ class App():
         self._current = Folder(path)
         self._items = self.current.children()
         self._UI = UI(self)
+        self._cursor = 2
 
     def _run(self, stdscr: curses.window) -> None:
         curses.curs_set(0)
@@ -58,3 +59,6 @@ class App():
     def UI(self) -> UI:
         return self._UI
 
+    @property
+    def cursor(self) -> int:
+        return self._cursor

src/UI.py

@@ -3,6 +3,7 @@ import stat
 from typing import TYPE_CHECKING
 import curses
 from .items.Symlink import Symlink
+from .items.AItems import AItem
 
 if TYPE_CHECKING:
     from .App import App
@@ -12,24 +13,39 @@ class UI:
     def __init__(self, app: App):
         self._app = app
 
-    def render(self, stdscr: curses.window):
+    def _get_attr(self, item: any, i: int) -> str:
+        attr = curses.color_pair(item.color_pair)
+        if i == self.app.cursor:
+            attr |= curses.A_REVERSE
+        return attr
+
+    def render(self, stdscr: curses.window) -> None:
         height, width = stdscr.getmaxyx()
         for i in range(min(height, len(self.app.items))):
             item = self.app.items[i]
-            name, size, perm = item.fields()
+            self._render_item(stdscr, item, i, width)
 
-            stdscr.attron(curses.color_pair(item.color_pair))
-            stdscr.addstr(i, 0, name)
+    ARROW = " -> "
+    ARROW_LEN = len(ARROW)
+    def _render_item(self, stdscr: curses.window, item: AItem, i: int, width: int) -> None:
+        name, size, perm = item.fields()
+        name_len = len(name)
+        col_width = int(width / 3)
 
-            if type(item) is Symlink:
-                stdscr.attron(curses.color_pair(0))
-                stdscr.addstr(i, len(name), " -> ")
-                stdscr.attron(curses.color_pair(Symlink.target_color(item.point_to)))
-                stdscr.addstr(i, len(name) + 4, str(item.point_to))
+        attr = self._get_attr(item, i)
+        stdscr.addstr(i, 0, name.ljust(col_width), attr)
 
-            stdscr.addstr(i, int(width / 3), str(size))
-            stdscr.addstr(i, int(width / 3) * 2, stat.filemode(perm))
-            stdscr.attroff(curses.color_pair(item.color_pair))
+        if type(item) is Symlink:
+            attr_arrow = curses.color_pair(0)
+            attr_target = curses.color_pair(Symlink.target_color(item.point_to))
+            if i == self.app.cursor:
+                attr_arrow |= curses.A_REVERSE
+                attr_target |= curses.A_REVERSE
+            stdscr.addstr(i, name_len, self.ARROW, attr_arrow)
+            stdscr.addstr(i, name_len + self.ARROW_LEN, str(item.point_to), attr_target)
+
+        stdscr.addstr(i, col_width, str(size).ljust(col_width * 2), attr)
+        stdscr.addstr(i, col_width * 2, stat.filemode(perm), attr)
 
     @property
     def app(self) -> App: