Fix lineWrap issues

gui.go

@@ -335,7 +335,7 @@ func (g *Gui) SetView(name string, x0, y0, x1, y1 int, overlaps byte) (*View, er
 
 	g.Mutexes.ViewsMutex.Lock()
 
-	v := newView(name, x0, y0, x1, y1, g.outputMode)
+	v := NewView(name, x0, y0, x1, y1, g.outputMode)
 	v.BgColor, v.FgColor = g.BgColor, g.FgColor
 	v.SelBgColor, v.SelFgColor = g.SelBgColor, g.SelFgColor
 	v.Overlaps = overlaps

view.go

@@ -402,8 +402,8 @@ func (l lineType) String() string {
 	return str
 }
 
-// newView returns a new View object.
-func newView(name string, x0, y0, x1, y1 int, mode OutputMode) *View {
+// NewView returns a new View object.
+func NewView(name string, x0, y0, x1, y1 int, mode OutputMode) *View {
 	v := &View{
 		name:              name,
 		x0:                x0,
@@ -494,31 +494,15 @@ func (v *View) setRune(x, y int, ch rune, fgColor, bgColor Attribute) {
 		bgColor = v.BgColor
 		ch = v.Mask
 	} else if v.Highlight {
-		var ry, rcy int
-
-		_, ry, ok := v.realPosition(x, y)
-		if !ok {
-			return
-		}
-		_, rrcy, ok := v.realPosition(v.cx, v.cy)
-		// out of bounds is fine
-		if ok {
-			rcy = rrcy
-		}
-
-		rangeSelectStart := rcy
-		rangeSelectEnd := rcy
+		rangeSelectStart := v.cy
+		rangeSelectEnd := v.cy
 		if v.rangeSelectStartY != -1 {
-			_, realRangeSelectStart, ok := v.realPosition(0, v.rangeSelectStartY-v.oy)
-			if !ok {
-				return
-			}
-
-			rangeSelectStart = min(realRangeSelectStart, rcy)
-			rangeSelectEnd = max(realRangeSelectStart, rcy)
+			relativeRangeSelectStart := v.rangeSelectStartY - v.oy
+			rangeSelectStart = min(relativeRangeSelectStart, v.cy)
+			rangeSelectEnd = max(relativeRangeSelectStart, v.cy)
 		}
 
-		if ry >= rangeSelectStart && ry <= rangeSelectEnd {
+		if y >= rangeSelectStart && y <= rangeSelectEnd {
 			// this ensures we use the bright variant of a colour upon highlight
 			fgColorComponent := fgColor & ^AttrAll
 			if fgColorComponent >= AttrIsValidColor && fgColorComponent < AttrIsValidColor+8 {
@@ -1103,6 +1087,8 @@ func (v *View) updateSearchPositions() {
 
 		if v.searcher.modelSearchResults != nil {
 			for _, result := range v.searcher.modelSearchResults {
+				// This code only works when v.Wrap is false.
+
 				if result.Y >= len(v.lines) {
 					break
 				}
@@ -1131,8 +1117,9 @@ func (v *View) updateSearchPositions() {
 				}
 			}
 		} else {
-			for y, line := range v.lines {
-				v.searcher.searchPositions = append(v.searcher.searchPositions, searchPositionsForLine(line, y)...)
+			v.refreshViewLinesIfNeeded()
+			for y, line := range v.viewLines {
+				v.searcher.searchPositions = append(v.searcher.searchPositions, searchPositionsForLine(line.line, y)...)
 			}
 		}
 	}
@@ -1373,6 +1360,8 @@ func (v *View) ViewBufferLines() []string {
 	v.writeMutex.Lock()
 	defer v.writeMutex.Unlock()
 
+	v.refreshViewLinesIfNeeded()
+
 	lines := make([]string, len(v.viewLines))
 	for i, l := range v.viewLines {
 		str := lineType(l.line).String()
@@ -1512,18 +1501,20 @@ func lineWrap(line []cell, columns int) [][]cell {
 				lines = append(lines, line[offset:i])
 				offset = i
 				n = rw
-			} else if lastWhitespaceIndex != -1 && lastWhitespaceIndex+1 != i {
+			} else if lastWhitespaceIndex != -1 {
 				// if there is a space in the line and the line is not breaking at a space/hyphen
 				if line[lastWhitespaceIndex].chr == '-' {
 					// if break occurs at hyphen, we'll retain the hyphen
 					lines = append(lines, line[offset:lastWhitespaceIndex+1])
-					offset = lastWhitespaceIndex + 1
-					n = i - offset
 				} else {
 					// if break occurs at space, we'll omit the space
 					lines = append(lines, line[offset:lastWhitespaceIndex])
-					offset = lastWhitespaceIndex + 1
-					n = i - offset + 1
+				}
+				// Either way, continue *after* the break
+				offset = lastWhitespaceIndex + 1
+				n = 0
+				for _, c := range line[offset : i+1] {
+					n += runewidth.RuneWidth(c.chr)
 				}
 			} else {
 				// in this case we're breaking mid-word

view_test.go

@@ -221,7 +221,48 @@ func TestLineWrap(t *testing.T) {
 			expected: []string{
 				"one-two-",
 				"three-",
-				"four-five",
+				"four-",
+				"five",
+			},
+		},
+		{
+			name:    "Several lines using all the available width",
+			line:    "aaa bb cc ddd-ee ff",
+			columns: 5,
+			expected: []string{
+				"aaa",
+				"bb cc",
+				"ddd-",
+				"ee ff",
+			},
+		},
+		{
+			name:    "Multi-cell runes",
+			line:    "🐤🐤🐤 🐝🐝 🙉 🦊🦊🦊-🐬🐬 🦢🦢",
+			columns: 9,
+			expected: []string{
+				"🐤🐤🐤",
+				"🐝🐝 🙉",
+				"🦊🦊🦊-",
+				"🐬🐬 🦢🦢",
+			},
+		},
+		{
+			name:    "Space in last column",
+			line:    "hello world",
+			columns: 6,
+			expected: []string{
+				"hello",
+				"world",
+			},
+		},
+		{
+			name:    "Hyphen in last column",
+			line:    "hello-world",
+			columns: 6,
+			expected: []string{
+				"hello-",
+				"world",
 			},
 		},
 		{