Add web/ — PTY+WebSocket server, xterm.js PWA client, Dockerfile, and PyInstaller notes

web/static/generate_icons.py

@@ -0,0 +1,30 @@
+"""Generate solid-colour placeholder PNG icons for the PWA manifest."""
+import struct
+import zlib
+from pathlib import Path
+
+
+def _chunk(chunk_type, data):
+    c = chunk_type + data
+    crc = struct.pack(">I", zlib.crc32(c) & 0xFFFFFFFF)
+    return struct.pack(">I", len(data)) + c + crc
+
+
+def solid_png(width, height, r, g, b):
+    header = b"\x89PNG\r\n\x1a\n"
+    ihdr = _chunk(b"IHDR", struct.pack(">IIBBBBB", width, height, 8, 2, 0, 0, 0))
+    raw = bytearray()
+    for _ in range(height):
+        raw.append(0)
+        raw.extend(bytes([r, g, b]) * width)
+    idat = _chunk(b"IDAT", zlib.compress(bytes(raw)))
+    iend = _chunk(b"IEND", b"")
+    return header + ihdr + idat + iend
+
+
+if __name__ == "__main__":
+    dst = Path(__file__).parent
+    for size in (192, 512):
+        path = dst / f"icon-{size}.png"
+        path.write_bytes(solid_png(size, size, 0x1A, 0x1A, 0x2E))
+        print(f"Created {path.name} ({size}x{size})")