Method Write

internal/tools/bash.go:238–263

(p []byte)

}

func (w *headTailBuffer) Write(p []byte) (int, error) {
	n := len(p)
	if room := bashOutputHead - len(w.head); room > 0 {
		take := min(room, len(p))
		w.head = append(w.head, p[:take]...)
		p = p[take:]
	}
	if len(p) == 0 {
		return n, nil
	}
	if w.ring == nil {
		w.ring = make([]byte, bashOutputTail)
	}
	w.tailBytes += int64(len(p))
	if len(p) >= bashOutputTail {
		copy(w.ring, p[len(p)-bashOutputTail:])
		w.pos = 0
		return n, nil
	}
	k := copy(w.ring[w.pos:], p)
	w.pos = (w.pos + k) % bashOutputTail
	if k < len(p) {
		w.pos = copy(w.ring, p[k:])
	}
	return n, nil
}

// droppedBytes is how many middle bytes the ring discarded; 0 while the whole
// output still fits head+tail.