Function nearestIndexed

packages/opencode/src/cli/cmd/run/theme.ts:242–264

(indexed: RGBA[], rgba: RGBA)

}

function nearestIndexed(indexed: RGBA[], rgba: RGBA): RGBA {
  const target = oklab(rgba)
  const hit = indexed.reduce(
    (best, item) => {
      const sample = oklab(item)
      const dl = sample.l - target.l
      const da = sample.a - target.a
      const db = sample.b - target.b
      const dist = dl * dl * 2 + da * da + db * db
      if (dist >= best.dist) return best
      return {
        dist,
        item,
      }
    },
    {
      dist: Number.POSITIVE_INFINITY,
      item: indexed[0]!,
    },
  )

  return RGBA.clone(hit.item)
}

function paletteColor(colors: TerminalColors, index: number): RGBA {
  const value = colors.palette[index]