Method executeBackground

tools/builtin.go:1497–1529

(command, description, cwd string, timeout time.Duration)

			bestScore = score
			bestIdx = i
		}
	}
	if bestScore < 0.3 {
		return fmt.Sprintf("  No similar lines found. Searched for: '%s'", truncateForMsg(oldFirst, 100))
	}
	start := max(0, bestIdx-2)
	end := min(len(lines), bestIdx+2)
	out := []string{fmt.Sprintf("  Closest match at line %d (%.0f%% similarity):", bestIdx+1, bestScore*100)}
	for i := start; i < end; i++ {
		marker := "   "
		if i == bestIdx {
			marker = ">>>"
		}
		out = append(out, fmt.Sprintf("  %s L%4d  %s", marker, i+1, truncateForMsg(lines[i], 120)))
	}
	return strings.Join(out, "\n")
}

func lineSimilarity(a, b string) float64 {
	if a == b {
		return 1
	}
	aTokens := strings.Fields(a)
	if len(aTokens) == 0 {
		return 0
	}
	bSet := map[string]struct{}{}
	for _, tok := range strings.Fields(b) {
		bSet[tok] = struct{}{}
	}
	intersect := 0
	for _, tok := range aTokens {
		if _, ok := bSet[tok]; ok {
			intersect++
		}
	}