feat(algorithm): three-column #44

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opened 2026-04-26 00:36:55 +00:00 by barrettruth · 0 comments

barrettruth commented

2026-04-26 00:36:55 +00:00

Add a three-column algorithm — one main column plus two slave columns. This tracks the XMonad ThreeCol family and gives Mosaic a symmetrical multi-column layout that is more capable than today's single-stack master-stack.

Scope

New file scripts/algorithms/three-column.sh
algo_relayout divides panes across three columns
Reuse promote / resize-master semantics around the main column
Define pane distribution between the two slave columns
Decide whether the main column stays on the left by default or can be centered via an option/variant

Acceptance criteria

Setting @mosaic-algorithm three-column applies a stable 3-column layout
promote moves a focused non-main pane into the main column
resize-master ±N resizes the main column
Split/kill hooks preserve the three-column shape
Tests cover 3, 4, 5+ pane cases and uneven slave counts
README documents behavior and naming

Open question

Is this a separate algorithm from centered-master, or should the two share one implementation with a placement option?

Part of #42.

Add a `three-column` algorithm — one main column plus two slave columns. This tracks the XMonad `ThreeCol` family and gives Mosaic a symmetrical multi-column layout that is more capable than today's single-stack `master-stack`. ## Scope - New file `scripts/algorithms/three-column.sh` - `algo_relayout` divides panes across three columns - Reuse `promote` / `resize-master` semantics around the main column - Define pane distribution between the two slave columns - Decide whether the main column stays on the left by default or can be centered via an option/variant ## Acceptance criteria - [ ] Setting `@mosaic-algorithm three-column` applies a stable 3-column layout - [ ] `promote` moves a focused non-main pane into the main column - [ ] `resize-master ±N` resizes the main column - [ ] Split/kill hooks preserve the three-column shape - [ ] Tests cover 3, 4, 5+ pane cases and uneven slave counts - [ ] README documents behavior and naming ## Open question Is this a separate algorithm from `centered-master`, or should the two share one implementation with a placement option? Part of #42.