Function normalizeHighlightedColor

src/ui/diff/pierre.ts:332–360

Remap Pierre token hues that collide with diff add/remove semantics into theme-safe syntax colors.

(color: string | undefined, theme: AppTheme)

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

  const themeKey = themeRenderCacheKey(theme);
  let cacheForTheme = normalizedColorCache.get(themeKey);
  if (!cacheForTheme) {
    cacheForTheme = new Map<string, string>();
    normalizedColorCache.set(themeKey, cacheForTheme);
  }

  const cached = cacheForTheme.get(color);
  if (cached) {
    return cached;
  }

  const normalized = color.trim().toLowerCase();
  const reserved =
    RESERVED_PIERRE_TOKEN_COLORS[theme.appearance][
      normalized as keyof (typeof RESERVED_PIERRE_TOKEN_COLORS)[typeof theme.appearance]
    ];
  const resolvedColor = reserved
    ? (theme.syntaxColors[reserved] ??
      (reserved === "operator" ? theme.syntaxColors.punctuation : theme.syntaxColors.default))
    : color;
  cacheForTheme.set(color, resolvedColor);
  return resolvedColor;
}

/** Append a span while coalescing adjacent runs with identical colors. */
function mergeSpan(target: RenderSpan[], next: RenderSpan) {