Print context of string around a point

prctx.go

// Print context of string around a point

func prctx(buf string, point int) {
	if point < 0 || point >= len(buf) {
		log.Printf("context for point: out of bounds (%d/%d)", point, len(buf))
		return
	}

	min := func(a int, b int) int {
		if a < b {
			return a
		}
		return b
	}

	max := func(a int, b int) int {
		if a > b {
			return a
		}
		return b
	}

	bufL := func(i int) int {
		return max(0, i)
	}

	bufR := func(i int) int {
		return min(len(buf), i)
	}

	log.Printf("context (%d, %d) @%d: %s{%s}%s", point-10, point+10, point,
		buf[bufL(point-10):point], buf[point:bufR(point+1)], buf[bufR(point+1):bufR(point+10)])
}