Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

screens/clock.py

@@ -0,0 +1,55 @@
+"""Simple full-screen clock."""
+
+import time
+
+from PIL import Image, ImageDraw
+
+from screens.base import Screen
+from screens.render_utils import load_font, text_width
+
+LINE_GAP = 0.04  # fraction of min(width, height) between the time and date lines
+
+WEEKDAYS_DE = ["Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag", "Sonntag"]
+MONTHS_DE = [
+    "Januar", "Februar", "März", "April", "Mai", "Juni",
+    "Juli", "August", "September", "Oktober", "November", "Dezember",
+]
+
+
+class ClockScreen(Screen):
+    id = "clock"
+    display_name = "Clock"
+    poll_interval = 30
+
+    def check(self, settings: dict):
+        return time.strftime("%H:%M")
+
+    def render(self, state, settings: dict, resolution: tuple[int, int]) -> Image.Image:
+        width, height = resolution
+        image = Image.new("RGB", (width, height), "white")
+        draw = ImageDraw.Draw(image)
+
+        now = time.localtime()
+        time_str = state or time.strftime("%H:%M", now)
+        date_str = f"{WEEKDAYS_DE[now.tm_wday]}, {now.tm_mday}. {MONTHS_DE[now.tm_mon - 1]}"
+
+        scale = min(width, height)
+        time_font = load_font(size=int(scale * 0.32), bold=True)
+        date_font = load_font(size=int(scale * 0.06))
+        gap = int(scale * LINE_GAP)
+
+        time_left, time_top, time_right, time_bottom = draw.textbbox((0, 0), time_str, font=time_font)
+        time_h = time_bottom - time_top
+        date_left, date_top, date_right, date_bottom = draw.textbbox((0, 0), date_str, font=date_font)
+        date_h = date_bottom - date_top
+
+        block_h = time_h + gap + date_h
+        block_top = (height - block_h) / 2
+
+        tw = time_right - time_left
+        draw.text(((width - tw) / 2, block_top - time_top), time_str, font=time_font, fill="black")
+
+        dw = date_right - date_left
+        draw.text(((width - dw) / 2, block_top + time_h + gap - date_top), date_str, font=date_font, fill=(90, 90, 90))
+
+        return image