stapel-calendar

Calendar, recurrence and scheduling for the Stapel framework — composable Django apps that deploy as a monolith or as microservices without changing module code.

A generic calendar core — Event / Participant / RSVP, an RFC 5545 recurrence engine (RRULE via python-dateutil, virtual expansion + on-demand materialization), availability (working windows, free/busy, slots) and ICS export. Two flavors of one domain — meetings and bookings — share this core; everything app-specific lives behind seams.

Install

pip install stapel-calendar

INSTALLED_APPS = [
    # ...
    "stapel_calendar",
]

# urls.py
path("calendar/", include("stapel_calendar.urls"))

Concepts

  • Event — a scheduled thing (meeting/booking/appointment) with tz-aware start/end, an owner and an opaque scope_key. No FK to any host concept (org, room) — scoping and resources are seams.
  • Recurrence — the series master stores a canonical RRULE. Occurrences are virtual until they gain their own state (an RSVP or a resource), at which point they are materialized (persisted) on demand.
  • Availability — recurring working windows minus busy events give open booking slots.
from stapel_calendar import services

series = services.create_event(
    owner=user, title="Standup",
    start=start, end=end,
    recurrence_type="weekdays",            # -> FREQ=DAILY;BYDAY=MO,TU,WE,TH,FR
)
occurrences = services.expand_event(series, range_start, range_end)  # virtual
services.materialize(series, occurrence_start)  # persist one + emit hook
busy = services.free_busy(user, range_start, range_end)
slots = services.compute_slots(user, range_start, range_end, slot_minutes=30)

Settings

All configuration lives in the STAPEL_CALENDAR namespace (dict setting, flat setting, or env var — resolved lazily):

Key Default Meaning
SCOPE_PROVIDER …scope.DefaultScopeProvider Resolve/filter the opaque scope_key
REMINDER_POLICY …reminders.DefaultReminderPolicy When/what to remind
PRESETS {} Custom recurrence presets (merged over built-ins)
REMINDER_OFFSETS [10] Minutes before start to remind
REMINDER_SCAN_WINDOW_SECONDS 60 Reminder cron granularity
DEFAULT_EXPANSION_HORIZON_DAYS 90 Default range end
MAX_EXPANSION_OCCURRENCES 1000 Expansion safety cap
DEFAULT_SLOT_MINUTES 30 Default slot length

comm surface

Kind Name Contract
Emit calendar.occurrence.materialized An occurrence was persisted — subscribe to attach a resource
Emit calendar.event.reminder_due A reminder is due — deliver it
Function calendar.free_busy {user_id, start, end, scope_key?} -> {busy: [...]}

Extension points

See MODULE.md — the agent-facing map of every fork-free seam (the resource hook, reminder policy, scope provider, recurrence presets, serializer seams, settings).

Development

pip install -e . && pip install pytest pytest-django ruff
./setup-hooks.sh
pytest tests/

License

MIT

Project links

Data verified by PyPI on Jul 7, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

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  • Released:
Newer release available (0.5.0)

1 maintainer

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Avatar for ucsoftworks from gravatar.com ucsoftworks

GitHub Statistics

Data verified by PyPI on Jul 7, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT)

Requires

Python >=3.11

Provides Extra

all

Tags

django stapel calendar

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