matamata 0.0.1

Model tournament knockout stages in JSON format and render the schedule in SVG or html table format

matamata

Model a tournament knockout stage in a small JSON "language" and render the schedule in SVG or HTML table format.

matamata also lets a host system map documents representing championship knockout stages onto its own business objects (e.g. a Championship or Cup entity) and persist them apart from any presentation concern — updating results means editing a document, never the code.

Example rendered from examples/libertadores-2026.json:

Quickstart

Requires Python ≥ 3.10. No runtime dependencies.

git clone https://github.com/anibalpacheco/matamata.git
cd matamata
python -m venv .venv && source .venv/bin/activate
pip install -e .

Render a self-contained example to an SVG file:

# via the installed command
matamata examples/knockout-8.json -o knockout.svg

# or via the module, writing to stdout
python -m matamata examples/knockout-8.json > knockout.svg

# or as an HTML table, the layout for small screens
matamata examples/knockout-8.json -o knockout.html

Open the resulting file in a browser to view the schedule. To render your own cup, point the command at any JSON file that follows docs/format.md.

Use it from Python:

from matamata import load_stage, render_svg

svg = render_svg(load_stage("examples/knockout-8.json"))

To use it in your own project instead, install straight from GitHub:

pip install git+https://github.com/anibalpacheco/matamata.git

Examples

Both examples are rendered from the JSON files in examples/.

The Copa Libertadores example above shows two-legged ties — each leg's goals are shown, shootouts appear in parentheses, and the winner of each tie is emphasized. The first quarterfinal is host-resolved: its legs carry only a ref, so its teams and scores come from get_match (see examples/libertadores_host.py) rather than from the document. Played ties take their team names from the legs; the final is a single match — one leg, so just one goal figure per side — with its winnerof links wiring the advancement tree.

Single matches (knockout-8.json) — one goal figure per side, with shootouts in parentheses. Sides that have not been resolved yet fall back to placeholders such as "Winner SF2":

The format

The document is plain JSON, so any system can store and exchange it natively, and the language is designed so a match can evolve from a placeholder (e.g. "winner of QF1") into a reference to a real match entity — each leg can carry a ref to the real game, resolved dynamically by the host — without changing the language. The advancement tree is laid out deterministically: coordinates are computed directly and the SVG is emitted as a string, with no layout engine and no heavy dependencies.

See docs/format.md for the full specification and docs/schema.json for the JSON Schema. Worked examples live in examples/.

Minimal example:

{
  "tournament": "Copa Libertadores",
  "season": "2026",
  "rounds": [
    {
      "name": "Final",
      "matches": [
        {
          "id": "final",
          "legs": [
            { "team1": "Flamengo", "goals1": 1, "team2": "Nacional", "goals2": 2 }
          ],
          "winner": 2
        }
      ]
    }
  ]
}

Documentation

docs/index.md is the manual: rendering from the CLI and from Python (e.g. a Django view), feeding live data from your own database through KnockoutStage, updating the stored document with apply_results — including a before/after walkthrough of one call — and running the test suite.

Status

Working: the language spec, JSON Schema, Python renderer, CLI and tests are in place, and the package is installable from GitHub.