Method highlightMatchedChars

kittens/command_palette/main.go:496–520

highlightMatchedChars returns a string with characters at the given rune positions rendered using matchStyle, and the rest rendered using baseStyle (or unstyled if baseStyle is empty).

(text string, positions []int, baseStyle, matchStyle string)

// positions rendered using matchStyle, and the rest rendered using baseStyle
// (or unstyled if baseStyle is empty).
func (h *Handler) highlightMatchedChars(text string, positions []int, baseStyle, matchStyle string) string {
	if len(positions) == 0 {
		if baseStyle != "" {
			return h.lp.SprintStyled(baseStyle, text)
		}
		return text
	}
	posSet := make(map[int]bool, len(positions))
	for _, p := range positions {
		posSet[p] = true
	}
	runes := []rune(text)
	var sb strings.Builder
	for i, r := range runes {
		ch := string(r)
		if posSet[i] {
			sb.WriteString(h.lp.SprintStyled(matchStyle, ch))
		} else if baseStyle != "" {
			sb.WriteString(h.lp.SprintStyled(baseStyle, ch))
		} else {
			sb.WriteString(ch)
		}
	}
	return sb.String()
}

// selectedBinding returns the currently selected binding, or nil if none.
func (h *Handler) selectedBinding() *Binding {