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Kida 0.2.2

Named call slots, slot-aware analysis, and circular macro import detection

Status: Released February 18, 2026.

This release improves component composition with named slots and strengthens macro import safety with explicit circular-import detection.

Highlights

  • Named slots in{% call %} — Use {% slot name %}...{% end %}inside call blocks and map content to{% slot name %} placeholders in {% def %}.
  • More expressive component APIs —caller()supports default and named slot dispatch (caller("header_actions")).
  • Safer macro imports — Direct and transitive circular imports now raise TemplateRuntimeError with K-TPL-003.
  • Slot-aware compiler/analysis passes — Validation and partial evaluation now walk slot bodies in call blocks.

Added

Named Slots for Call Blocks

Kida now supports named slot blocks within{% call %}for multi-region components:

{% def card(title) %}
  <article>
    <h2>{{ title }}</h2>
    <div class="actions">{% slot header_actions %}</div>
    <div class="body">{% slot %}</div>
  </article>
{% end %}

{% call card("Settings") %}
  {% slot header_actions %}<button>Save</button>{% end %}
  <p>Body content.</p>
{% end %}

Existing default-slot usage remains compatible.

Changed

Slot Dispatch incaller()

Functions invoked via{% call %}can now read:

  • caller()for default slot content
  • caller("slot_name")for named slot content

This makes it easier to build composable template components without custom context plumbing.

Analysis and Optimization Over Slot Bodies

Static analysis and partial-evaluation passes now traverse slot bodies in CallBlock, so slot-contained expressions receive the same checks and transformations as top-level call content.

Fixed

Circular Macro Imports (K-TPL-003)

When using{% from "template.html" import macro_name %}, direct and transitive cycles are now detected and reported as a clearTemplateRuntimeError:

Code: K-TPL-003
Message: Circular import detected

This replaces recursion-driven failures with deterministic, actionable errors.

Upgrade Notes

  1. No breaking template syntax changes — Existing{% call %}+ default slot templates continue to work.
  2. Optional migration path — Adopt named slots incrementally where components need multiple insertion regions.
  3. Error handling — If you catchTemplateRuntimeError, include code checks forK-TPL-003where macro imports are dynamic.