overlays 2.1.2

Python client library and launcher for the overlays Rust server on Windows.

overlays

A Windows overlay server with a Python client library. The published overlays wheel bundles the Rust overlays-server.exe, so users can start the server directly from the installed package.

Install And Run

• Windows 10 or later
• Python 3.10+ for the packaged launcher and client library

Run the packaged server without installing anything permanently:

uvx overlays

After installing the package, either entry point starts the bundled server in the foreground:

overlays
overlays-server

Set OVERLAY_PIPE_NAME if you want a different named pipe:

$env:OVERLAY_PIPE_NAME="overlay_manager_env"
uvx overlays

The server listens on \\.\pipe\{OVERLAY_PIPE_NAME} and defaults to \\.\pipe\overlay_manager.

Standalone Binary

GitHub Releases also publish a portable Windows zip named overlays-server-v<version>-windows-x64.zip. It contains:

• overlays-server.exe
• README.txt
• SHA256SUMS.txt

Use The Python Client

from overlays.client import OverlayClient

overlay = OverlayClient()

overlay.create_highlight_window(rect=(100, 100, 400, 300), timeout_seconds=5)
overlay.create_countdown_window(message_text="Get ready!", countdown_seconds=10)
overlay.create_elapsed_time_window(message_text="Session Length")
overlay.create_qrcode_window(
    data={"url": "https://example.com"},
    duration=15,
    caption="Scan me",
)
overlay.update_window_message(window_id=2, new_message="Halfway there...")
overlay.close_window(window_id=1)
overlay.take_break(duration_seconds=60)
overlay.cancel_break()

Development

Development requires Rust stable in addition to Python.

Install Python dependencies:

uv sync --dev

Run the Rust server from source:

cargo run --manifest-path rust/overlays-server/Cargo.toml

Build and test the Rust server:

cargo build --manifest-path rust/overlays-server/Cargo.toml
cargo test --manifest-path rust/overlays-server/Cargo.toml

Run the Python tests, including client compatibility checks against the built Rust binary:

uv run pytest -v

If the compatibility tests need an explicit server executable path, set OVERLAYS_SERVER_BIN.

IPC Commands

Command	Args	Description
create_highlight_window	rect: (l, t, r, b), timeout_seconds: int	Shows a colored rectangle for a duration.
create_countdown_window	message_text: str, countdown_seconds: int	Starts a countdown timer.
create_elapsed_time_window	message_text: str	Displays elapsed time since creation.
create_qrcode_window	data: str | dict, duration: int, caption: str	Renders a QR code overlay.
update_window_message	window_id: int, new_message: str	Changes the text of a countdown or elapsed-time window.
close_window	window_id: int	Closes any overlay window.
take_break	duration_seconds: int	Discards incoming non-break commands for a break period.
cancel_break	(none)	Cancels any active break.