Reject gapped events

[rsgalloway]

This pull request introduces a new validation function for event data, ensuring that event date sequences are strictly increasing and consecutive, with no gaps. The validation logic is now centralized and reused across the codebase, improving data integrity and maintainability. The release version is also bumped to 0.5.9, and copyright years are updated.

Event validation improvements:

• Added a new validate_events function in drawcal/events.py to check that each event is a list of consecutive, strictly increasing date strings in "M/D/YYYY" format. This function raises descriptive errors for invalid input.
• Updated read_events to use validate_events, removing duplicate validation logic and ensuring consistent checks for events loaded from files.
• Updated draw_calendar in drawcal/drawlib.py to call validate_events when events are provided directly, enforcing validation for all event entry points. [1] [2]

Testing enhancements:

• Added new unit tests in tests/test_events.py and tests/test_render.py to verify that gapped or non-consecutive events are correctly rejected by both file and direct input validation. [1] [2] [3]

Versioning and metadata:

• Bumped the project version to 0.5.9 in pyproject.toml and drawcal/__init__.py. [1] [2]
• Updated copyright years to 2026 in all relevant files. [1] [2] [3] [4] [5] [6]

These changes ensure that event data is consistently validated, preventing subtle bugs and improving user feedback for incorrect input.

[Copilot]

Pull request overview

This PR centralizes event validation so both file-loaded and directly provided events reject non-consecutive date sequences before rendering, while also bumping the package version and updating copyright years.

Changes:

• Adds validate_events for list/date format checks plus strict consecutive ordering.
• Reuses validation from read_events and draw_calendar.
• Adds regression tests for gapped events and updates metadata to 0.5.9 / 2026.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/drawcal/events.py	Adds centralized event validation and applies it to file-loaded events.
lib/drawcal/drawlib.py	Validates directly supplied events before rendering.
tests/test_events.py	Adds tests for rejecting gapped events from files and direct validation.
tests/test_render.py	Adds render-entry validation coverage for gapped events.
pyproject.toml	Bumps project version to 0.5.9.
lib/drawcal/__init__.py	Bumps runtime package version and copyright year.
LICENSE	Updates copyright year.
bin/drawcal	Updates copyright year.
lib/drawcal/cli.py	Updates copyright year.
lib/drawcal/config.py	Updates copyright year.

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