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nim-tui-architecture

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Mis à jour7 juillet 2026 à 22:09

Use when working on TaTUÍ's render path: Buffer, Cell, diffing, the terminal tick loop, or backend dispatch. Covers allocation-free steady state, buffer swapping, and the immediate/retained boundary. Triggers: buffer, diff, tick, render path, allocation, swap, double buffering.

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invector-tecnologia

invector-tecnologia/tatui

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Basé sur la classification professionnelle SOC

Développeurs de logicielsProfessions informatiques et mathématiques·SOC 15-1252

SKILL.md

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name	nim-tui-architecture
description	Use when working on TaTUÍ's render path: Buffer, Cell, diffing, the terminal tick loop, or backend dispatch. Covers allocation-free steady state, buffer swapping, and the immediate/retained boundary. Triggers: buffer, diff, tick, render path, allocation, swap, double buffering.

TaTUÍ render-path architecture

The tick (never reorder)

Terminal.draw(render) builds a Frame over nextBuffer.
Layout splits the Rect; widgets render(area, nextBuffer).
Diff nextBuffer vs currentBuffer → minimal cell patches.
Encode patches (minimal cursor moves + coalesced SGR runs) → Backend.draw.
Backend.flush; reconcile cursor; swap(current, next); reset next in place.

Allocation-free rules

Buffers are sized once to the terminal area and reused. Per-frame reallocation is a bug.
No string building or seq growth in diff/encode. Pre-size, index, reuse scratch buffers.
Verify with tests/test_alloc_invariant.nim (0 getOccupiedMem delta across ticks).

Immediate vs retained

Widgets are immediate: reconstructed each tick, no retained render state.
The cell buffer is retained: it is the diff baseline. Do not remove or bypass it.

Backend boundary

Output bytes only in src/tatui/backend/. Core describes what changed via BufferPatch.

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name	nim-tui-architecture
description	Use when working on TaTUÍ's render path: Buffer, Cell, diffing, the terminal tick loop, or backend dispatch. Covers allocation-free steady state, buffer swapping, and the immediate/retained boundary. Triggers: buffer, diff, tick, render path, allocation, swap, double buffering.

TaTUÍ render-path architecture

The tick (never reorder)

Terminal.draw(render) builds a Frame over nextBuffer.
Layout splits the Rect; widgets render(area, nextBuffer).
Diff nextBuffer vs currentBuffer → minimal cell patches.
Encode patches (minimal cursor moves + coalesced SGR runs) → Backend.draw.
Backend.flush; reconcile cursor; swap(current, next); reset next in place.

Allocation-free rules

Buffers are sized once to the terminal area and reused. Per-frame reallocation is a bug.
No string building or seq growth in diff/encode. Pre-size, index, reuse scratch buffers.
Verify with tests/test_alloc_invariant.nim (0 getOccupiedMem delta across ticks).

Immediate vs retained

Widgets are immediate: reconstructed each tick, no retained render state.
The cell buffer is retained: it is the diff baseline. Do not remove or bypass it.

Backend boundary

Output bytes only in src/tatui/backend/. Core describes what changed via BufferPatch.