feat: add line-number gutter

2026-10-08 11:17:03 +02:00
parent 619c180316
commit a3a0da2586
2 changed files with 163 additions and 29 deletions
@@ -91,6 +91,8 @@ The terminal adapter owns raw mode, alternate-screen state, bracketed paste, and

 The TUI uses Ratatui constraint-based layout for a flexible buffer viewport, a one-row status bar, and a one-row prompt/message area. Scrolling, clipping, highlights, and cursor placement use the allocated regions, not terminal-wide offsets. Below three rows the status bar is hidden; at one row the buffer remains visible unless an active command/search prompt takes priority. Zero-sized terminals render nothing. Layout and terminal-cell text mapping remain frontend-owned.

+The buffer viewport includes a fixed left gutter with right-aligned, one-based absolute line numbers and a highlighted primary cursor line number. Gutter width follows the total line count plus one separator cell, including an empty final row after a trailing newline. Horizontal scrolling affects only text; search/selection highlights and carets never paint over the gutter. Rows beyond the buffer have no number. The gutter is hidden when it would leave no text column.
+
 Built-in Ex commands register as the protected `core` feature in the same command registry used by plugins. External plugins cannot claim core status, replace existing commands, or disable core. User configuration can override any keybinding without replacing the core implementation. `:plugins` lists active features and frontend capabilities.

 A feature declares all capabilities it needs. Registration is atomic: if any requirement is unavailable or any command conflicts, none of its commands are installed. For example, `Vamp.plugin "canvas", requires: ["graphics"]` will be refused by this TUI. Capability names are extensible strings, not a terminal-vs-GUI switch. Capability declarations express compatibility; they are not security permissions.