history_payload.go RawHistoryFolder

1package vt
2
3import renderer "github.com/bnema/vev-vt/core"
4
5func (c *HistoryChunk) recordPayloads() {
6	frame := c.frameView()
7	var last map[renderer.CellPayload]int
8	for row := range c.count {
9		for x := range c.width {
10			p := frame.Cell(x, c.start+row).Payload
11			if p.Empty() {
12				continue
13			}
14			if last == nil {
15				last = make(map[renderer.CellPayload]int)
16			}
17			last[p] = c.start + row
18		}
19	}
20	c.payloadBytes = 0
21	c.payloadDrops = nil
22	if len(last) == 0 {
23		return
24	}
25	c.payloadDrops = make([]uint64, frame.Height)
26	for value, row := range last {
27		bytes := value.LogicalBytes()
28		c.payloadBytes += bytes
29		c.payloadDrops[row] += bytes
30	}
31}
32
33func (c *HistoryChunk) withoutFirstRow() *HistoryChunk {
34	next := *c
35	next.dropFirstRow()
36	return &next
37}
38
39// dropFirstRow advances the wrapper past its first row in place. Only a wrapper
40// no view has captured may be mutated; see History.privateHead.
41func (c *HistoryChunk) dropFirstRow() {
42	if len(c.payloadDrops) != 0 {
43		c.payloadBytes -= c.payloadDrops[c.start]
44	}
45	c.styleCount -= c.styleDrops[c.start]
46	c.start++
47	c.count--
48	c.bounds = c.bounds[1:]
49	c.rowIDs = c.rowIDs[1:]
50}
51
52func (h *History) recordPayloadScratch(p renderer.CellPayload) {
53	if p.Empty() {
54		return
55	}
56	if h.payloadScratch == nil {
57		h.payloadScratch = make(map[renderer.CellPayload]struct{})
58	}
59	h.payloadScratch[p] = struct{}{}
60}
61
62func (h *History) rowPayloadBytes() uint64 {
63	var n uint64
64	for p := range h.payloadScratch {
65		n += p.LogicalBytes()
66	}
67	return n
68}