Make jinja default slot rendering opt-in and customizable

[volfpeter]

Closes #114

Summary by CodeRabbit

• New Features
  • Added a use_default_slots option to control whether default slots are rendered in Jinja templates.
  • Default slot selection is now overridable/customizable, while explicitly provided slots still take precedence.
• Tests
  • Expanded the Jinja template rendering test matrix to validate behavior with default slots both enabled and disabled, including recursive templates.
• Chores
  • Bumped the package version to 0.13.0.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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• htmy/__init__.py

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📝 Walkthrough

Walkthrough

JinjaTemplate now makes default-slot rendering opt-in through use_default_slots, delegates slot selection to _get_default_slots(), preserves explicit-slot precedence, and updates tests and the package version.

Changes

Jinja default-slot rendering

Layer / File(s)	Summary
Default-slot configuration and rendering htmy/jinja.py, htmy/__init__.py	Adds the opt-in flag and overridable slot lookup hook, conditionally renders default slots, preserves explicit-slot precedence, and bumps the package version.
Default-slot behavior coverage tests/test_jinja.py	Updates parametrized tests and validates opt-in, opt-out, merging, overriding, and recursion behavior.

Estimated code review effort: 2 (Simple) | ~10 minutes

Sequence Diagram(s)

sequenceDiagram
  participant JinjaTemplate
  participant RenderingContext
  participant JinjaEngine
  JinjaTemplate->>RenderingContext: Look up default slots
  RenderingContext-->>JinjaTemplate: Return slot components
  JinjaTemplate->>JinjaTemplate: Render enabled slots and merge explicit slots
  JinjaTemplate->>JinjaEngine: Render template with slots context

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Possibly related PRs

• volfpeter/htmy#110: Adds the Jinja template and slot infrastructure extended by this change.
• volfpeter/htmy#112: Modifies the same Jinja context and slot-resolution path.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The version bump in htmy/init.py is unrelated to issue #114 and appears outside the requested scope.	Remove the version-only change or include it only if the release bump is intentionally part of this PR.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the main change: making Jinja default slot rendering opt-in and customizable.
Linked Issues check	✅ Passed	The changes add an opt-in flag and a customizable hook, matching issue #114's requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jinja-defaultslots-optin

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@htmy/jinja.py`:
- Around line 173-175: Update the default-slot loop in the rendering method to
skip any name already present in self._slots before calling renderer.render.
Preserve rendering for non-overridden default slots and the existing assignment
behavior for those slots.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5cd49b5c-afc1-40b1-8199-ef6e1fcd0c59

📥 Commits

Reviewing files that changed from the base of the PR and between 08d6ca7 and b5e7b79.

📒 Files selected for processing (2)

• htmy/jinja.py
• tests/test_jinja.py