Function wordDiffHighlightBg

src/ui/diff/pierre.ts:304–329

Resolve the inline word-diff background, strengthening theme colors that are too subtle to see.

(kind: SplitLineCell["kind"], theme: AppTheme)

/** Resolve the inline word-diff background, strengthening theme colors that are too subtle to see. */
function wordDiffHighlightBg(kind: SplitLineCell["kind"], theme: AppTheme) {
  const cacheKey = [themeRenderCacheKey(theme), theme.contextContentBg, theme.panelAlt].join(":");
  let cached = wordDiffBackgroundCache.get(cacheKey);
  if (!cached) {
    const addition = resolveWordDiffHighlightBg(
      theme.addedContentBg,
      theme.addedBg,
      theme.addedSignColor,
    );
    const deletion = resolveWordDiffHighlightBg(
      theme.removedContentBg,
      theme.removedBg,
      theme.removedSignColor,
    );

    cached = {
      addition,
      context: theme.contextContentBg,
      deletion,
      empty: theme.panelAlt,
    };
    wordDiffBackgroundCache.set(cacheKey, cached);
  }

  return cached[kind];
}

/** Remap Pierre token hues that collide with diff add/remove semantics into theme-safe syntax colors. */
function normalizeHighlightedColor(color: string | undefined, theme: AppTheme) {