[stacked] Preserve rail style in generated buffers and reloads #157

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opened 2026-09-21 18:12:36 +00:00 by barrettruth · 0 comments

barrettruth commented

2026-09-21 18:12:36 +00:00

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Original issue: barrettruth/diffs.nvim#363
Original author: barrettruth
Original date: 2026-05-28T02:57:37Z

Part of #358.

Goal

Persist generated-buffer rail style so stacked buffers remain stacked across refresh and :edit reloads.

Scope

Store a generated buffer rail style, for example b:diffs_rail_style = 'dual'|'single', alongside existing rail width vars.
Add a helper to read the buffer rail style with dual as the compatibility default.
Extend generated buffer creation to accept a rail style and pass it to rail annotation.
Extend generated buffer replacement/reload to preserve the existing buffer rail style when no explicit override is supplied.
Ensure generated hunk action metadata is still parsed from raw diff lines, not rail-prefixed display lines.

Non-goals

Do not introduce a public config option.
Do not store rail style in source metadata unless the implementation needs it for reliable reloads.
Do not alter default unified buffers.

Acceptance criteria

Generated buffers carry rail width, separator width, and style metadata.
Replacing generated diff lines preserves single rail style when the buffer was created as single rail.
commands.read_buffer() / :edit reload does not revert stacked buffers back to dual rails.
Raw hunk metadata remains rail-free and usable for hunk actions.

> Original issue: barrettruth/diffs.nvim#363 > Original author: `barrettruth` > Original date: 2026-05-28T02:57:37Z Part of #358. ## Goal Persist generated-buffer rail style so stacked buffers remain stacked across refresh and `:edit` reloads. ## Scope - Store a generated buffer rail style, for example `b:diffs_rail_style = 'dual'|'single'`, alongside existing rail width vars. - Add a helper to read the buffer rail style with `dual` as the compatibility default. - Extend generated buffer creation to accept a rail style and pass it to rail annotation. - Extend generated buffer replacement/reload to preserve the existing buffer rail style when no explicit override is supplied. - Ensure generated hunk action metadata is still parsed from raw diff lines, not rail-prefixed display lines. ## Non-goals - Do not introduce a public config option. - Do not store rail style in source metadata unless the implementation needs it for reliable reloads. - Do not alter default unified buffers. ## Acceptance criteria - Generated buffers carry rail width, separator width, and style metadata. - Replacing generated diff lines preserves single rail style when the buffer was created as single rail. - `commands.read_buffer()` / `:edit` reload does not revert stacked buffers back to dual rails. - Raw hunk metadata remains rail-free and usable for hunk actions.

barrettruth

2026-09-21 18:12:36 +00:00