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Highlight changelog row under the mouse cursor #50

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Merged
nedtwigg merged 1 commit into from
May 6, 2026
Merged

Highlight changelog row under the mouse cursor #50

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33 changes: 29 additions & 4 deletions website/src/lib/changelog-runner.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,8 @@ export class ChangelogRunner implements InteractiveProgram {
private selectedIndex = 0;
private listOffset = 0;
private detailOffset = 0;
private hoverIndex: number | null = null;
private lastMousePos: { col: number; row: number } | null = null;
private resizeUnsub: (() => void) | null = null;
private disposed = false;
private detailCache: { index: number; width: number; lines: string[] } | null = null;
Expand Down Expand Up @@ -161,6 +163,7 @@ export class ChangelogRunner implements InteractiveProgram {
}

private handleMouse(button: number, col: number, row: number, finalByte: string): void {
this.lastMousePos = { col, row };
// Wheel scroll routes to whichever column the cursor is over so each
// side scrolls independently.
if (button === WHEEL_UP) {
Expand All @@ -173,11 +176,17 @@ export class ChangelogRunner implements InteractiveProgram {
else this.scrollDetail(1);
return;
}
// Motion (no button held). 1003h reports these as button code 35:
// bit 5 (motion) | code 3 (no button). Highlight the list row under
// the cursor so the user can see where a click would land.
if (button === 35 && finalByte === "M") {
if (this.listIndexAt(col, row) !== this.hoverIndex) this.render();
return;
}
// Left-button press on the version list selects that release.
if (button === 0 && finalByte === "M" && col < LIST_WIDTH) {
const bodyTop = HEADER_ROWS;
const idx = this.listOffset + (row - bodyTop);
if (idx >= 0 && idx < RELEASES.length) {
if (button === 0 && finalByte === "M") {
const idx = this.listIndexAt(col, row);
if (idx !== null) {
this.selectedIndex = idx;
this.detailOffset = 0;
this.ensureSelectionVisible();
Expand All @@ -186,6 +195,14 @@ export class ChangelogRunner implements InteractiveProgram {
}
}

private listIndexAt(col: number, row: number): number | null {
if (col >= LIST_WIDTH) return null;
const r = row - HEADER_ROWS;
if (r < 0 || r >= this.bodyHeight()) return null;
const idx = this.listOffset + r;
return idx >= 0 && idx < RELEASES.length ? idx : null;
}

private moveSelection(delta: number): void {
const next = Math.max(0, Math.min(RELEASES.length - 1, this.selectedIndex + delta));
if (next === this.selectedIndex) return;
Expand Down Expand Up @@ -280,6 +297,12 @@ export class ChangelogRunner implements InteractiveProgram {
private render(): void {
if (this.disposed) return;
this.lastSize = { ...this.size };
// Re-sync hover from the cursor's last position so wheel-scrolls and
// keyboard jumps move the highlight to whatever release is now under
// the mouse.
this.hoverIndex = this.lastMousePos
? this.listIndexAt(this.lastMousePos.col, this.lastMousePos.row)
: null;
const bodyH = this.bodyHeight();
const detailLines = this.getDetailLines();

Expand All @@ -296,6 +319,8 @@ export class ChangelogRunner implements InteractiveProgram {
const padded = label.length > LIST_WIDTH - 2 ? label.slice(0, LIST_WIDTH - 2) : label.padEnd(LIST_WIDTH - 2);
if (idx === this.selectedIndex) {
leftCell = `${fg(36)}❯${RESET} ${BOLD}${padded}${RESET}`;
} else if (idx === this.hoverIndex) {
leftCell = `${fg(36)}›${RESET} ${padded}`;
} else {
leftCell = ` ${padded}`;
}
Expand Down
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