build: go 1.24

We were running behind and there were quite some deprecations to update.
This was mostly in the upstream copy/pasta package but seems quite
minimal.

vendor/github.com/charmbracelet/x/cellbuf/hashmap.go

@@ -0,0 +1,301 @@
+package cellbuf
+
+import (
+	"github.com/charmbracelet/x/ansi"
+)
+
+// hash returns the hash value of a [Line].
+func hash(l Line) (h uint64) {
+	for _, c := range l {
+		var r rune
+		if c == nil {
+			r = ansi.SP
+		} else {
+			r = c.Rune
+		}
+		h += (h << 5) + uint64(r)
+	}
+	return
+}
+
+// hashmap represents a single [Line] hash.
+type hashmap struct {
+	value              uint64
+	oldcount, newcount int
+	oldindex, newindex int
+}
+
+// The value used to indicate lines created by insertions and scrolls.
+const newIndex = -1
+
+// updateHashmap updates the hashmap with the new hash value.
+func (s *Screen) updateHashmap() {
+	height := s.newbuf.Height()
+	if len(s.oldhash) >= height && len(s.newhash) >= height {
+		// rehash changed lines
+		for i := 0; i < height; i++ {
+			_, ok := s.touch[i]
+			if ok {
+				s.oldhash[i] = hash(s.curbuf.Line(i))
+				s.newhash[i] = hash(s.newbuf.Line(i))
+			}
+		}
+	} else {
+		// rehash all
+		if len(s.oldhash) != height {
+			s.oldhash = make([]uint64, height)
+		}
+		if len(s.newhash) != height {
+			s.newhash = make([]uint64, height)
+		}
+		for i := 0; i < height; i++ {
+			s.oldhash[i] = hash(s.curbuf.Line(i))
+			s.newhash[i] = hash(s.newbuf.Line(i))
+		}
+	}
+
+	s.hashtab = make([]hashmap, height*2)
+	for i := 0; i < height; i++ {
+		hashval := s.oldhash[i]
+
+		// Find matching hash or empty slot
+		idx := 0
+		for idx < len(s.hashtab) && s.hashtab[idx].value != 0 {
+			if s.hashtab[idx].value == hashval {
+				break
+			}
+			idx++
+		}
+
+		s.hashtab[idx].value = hashval // in case this is a new hash
+		s.hashtab[idx].oldcount++
+		s.hashtab[idx].oldindex = i
+	}
+	for i := 0; i < height; i++ {
+		hashval := s.newhash[i]
+
+		// Find matching hash or empty slot
+		idx := 0
+		for idx < len(s.hashtab) && s.hashtab[idx].value != 0 {
+			if s.hashtab[idx].value == hashval {
+				break
+			}
+			idx++
+		}
+
+		s.hashtab[idx].value = hashval // in case this is a new hash
+		s.hashtab[idx].newcount++
+		s.hashtab[idx].newindex = i
+
+		s.oldnum[i] = newIndex // init old indices slice
+	}
+
+	// Mark line pair corresponding to unique hash pairs.
+	for i := 0; i < len(s.hashtab) && s.hashtab[i].value != 0; i++ {
+		hsp := &s.hashtab[i]
+		if hsp.oldcount == 1 && hsp.newcount == 1 && hsp.oldindex != hsp.newindex {
+			s.oldnum[hsp.newindex] = hsp.oldindex
+		}
+	}
+
+	s.growHunks()
+
+	// Eliminate bad or impossible shifts. This includes removing those hunks
+	// which could not grow because of conflicts, as well those which are to be
+	// moved too far, they are likely to destroy more than carry.
+	for i := 0; i < height; {
+		var start, shift, size int
+		for i < height && s.oldnum[i] == newIndex {
+			i++
+		}
+		if i >= height {
+			break
+		}
+		start = i
+		shift = s.oldnum[i] - i
+		i++
+		for i < height && s.oldnum[i] != newIndex && s.oldnum[i]-i == shift {
+			i++
+		}
+		size = i - start
+		if size < 3 || size+min(size/8, 2) < abs(shift) {
+			for start < i {
+				s.oldnum[start] = newIndex
+				start++
+			}
+		}
+	}
+
+	// After clearing invalid hunks, try grow the rest.
+	s.growHunks()
+}
+
+// scrollOldhash
+func (s *Screen) scrollOldhash(n, top, bot int) {
+	if len(s.oldhash) == 0 {
+		return
+	}
+
+	size := bot - top + 1 - abs(n)
+	if n > 0 {
+		// Move existing hashes up
+		copy(s.oldhash[top:], s.oldhash[top+n:top+n+size])
+		// Recalculate hashes for newly shifted-in lines
+		for i := bot; i > bot-n; i-- {
+			s.oldhash[i] = hash(s.curbuf.Line(i))
+		}
+	} else {
+		// Move existing hashes down
+		copy(s.oldhash[top-n:], s.oldhash[top:top+size])
+		// Recalculate hashes for newly shifted-in lines
+		for i := top; i < top-n; i++ {
+			s.oldhash[i] = hash(s.curbuf.Line(i))
+		}
+	}
+}
+
+func (s *Screen) growHunks() {
+	var (
+		backLimit    int // limits for cells to fill
+		backRefLimit int // limit for references
+		i            int
+		nextHunk     int
+	)
+
+	height := s.newbuf.Height()
+	for i < height && s.oldnum[i] == newIndex {
+		i++
+	}
+	for ; i < height; i = nextHunk {
+		var (
+			forwardLimit    int
+			forwardRefLimit int
+			end             int
+			start           = i
+			shift           = s.oldnum[i] - i
+		)
+
+		// get forward limit
+		i = start + 1
+		for i < height &&
+			s.oldnum[i] != newIndex &&
+			s.oldnum[i]-i == shift {
+			i++
+		}
+
+		end = i
+		for i < height && s.oldnum[i] == newIndex {
+			i++
+		}
+
+		nextHunk = i
+		forwardLimit = i
+		if i >= height || s.oldnum[i] >= i {
+			forwardRefLimit = i
+		} else {
+			forwardRefLimit = s.oldnum[i]
+		}
+
+		i = start - 1
+
+		// grow back
+		if shift < 0 {
+			backLimit = backRefLimit + (-shift)
+		}
+		for i >= backLimit {
+			if s.newhash[i] == s.oldhash[i+shift] ||
+				s.costEffective(i+shift, i, shift < 0) {
+				s.oldnum[i] = i + shift
+			} else {
+				break
+			}
+			i--
+		}
+
+		i = end
+		// grow forward
+		if shift > 0 {
+			forwardLimit = forwardRefLimit - shift
+		}
+		for i < forwardLimit {
+			if s.newhash[i] == s.oldhash[i+shift] ||
+				s.costEffective(i+shift, i, shift > 0) {
+				s.oldnum[i] = i + shift
+			} else {
+				break
+			}
+			i++
+		}
+
+		backLimit = i
+		backRefLimit = backLimit
+		if shift > 0 {
+			backRefLimit += shift
+		}
+	}
+}
+
+// costEffective returns true if the cost of moving line 'from' to line 'to' seems to be
+// cost effective. 'blank' indicates whether the line 'to' would become blank.
+func (s *Screen) costEffective(from, to int, blank bool) bool {
+	if from == to {
+		return false
+	}
+
+	newFrom := s.oldnum[from]
+	if newFrom == newIndex {
+		newFrom = from
+	}
+
+	// On the left side of >= is the cost before moving. On the right side --
+	// cost after moving.
+
+	// Calculate costs before moving.
+	var costBeforeMove int
+	if blank {
+		// Cost of updating blank line at destination.
+		costBeforeMove = s.updateCostBlank(s.newbuf.Line(to))
+	} else {
+		// Cost of updating exiting line at destination.
+		costBeforeMove = s.updateCost(s.curbuf.Line(to), s.newbuf.Line(to))
+	}
+
+	// Add cost of updating source line
+	costBeforeMove += s.updateCost(s.curbuf.Line(newFrom), s.newbuf.Line(from))
+
+	// Calculate costs after moving.
+	var costAfterMove int
+	if newFrom == from {
+		// Source becomes blank after move
+		costAfterMove = s.updateCostBlank(s.newbuf.Line(from))
+	} else {
+		// Source gets updated from another line
+		costAfterMove = s.updateCost(s.curbuf.Line(newFrom), s.newbuf.Line(from))
+	}
+
+	// Add cost of moving source line to destination
+	costAfterMove += s.updateCost(s.curbuf.Line(from), s.newbuf.Line(to))
+
+	// Return true if moving is cost effective (costs less or equal)
+	return costBeforeMove >= costAfterMove
+}
+
+func (s *Screen) updateCost(from, to Line) (cost int) {
+	var fidx, tidx int
+	for i := s.newbuf.Width() - 1; i > 0; i, fidx, tidx = i-1, fidx+1, tidx+1 {
+		if !cellEqual(from.At(fidx), to.At(tidx)) {
+			cost++
+		}
+	}
+	return
+}
+
+func (s *Screen) updateCostBlank(to Line) (cost int) {
+	var tidx int
+	for i := s.newbuf.Width() - 1; i > 0; i, tidx = i-1, tidx+1 {
+		if !cellEqual(nil, to.At(tidx)) {
+			cost++
+		}
+	}
+	return
+}