feat: Vertical Cell Merging In Table Columns

examples/go.mod

@@ -1,6 +1,8 @@
 module examples
 
-go 1.19
+go 1.23.0
+
+toolchain go1.24.1
 
 replace github.com/charmbracelet/lipgloss => ../
 
@@ -21,7 +23,7 @@ require (
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/charmbracelet/bubbletea v0.25.0 // indirect
-	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
+	github.com/charmbracelet/colorprofile v0.3.0 // indirect
 	github.com/charmbracelet/keygen v0.5.0 // indirect
 	github.com/charmbracelet/log v0.4.0 // indirect
 	github.com/charmbracelet/x/ansi v0.8.0 // indirect
@@ -45,6 +47,6 @@ require (
 	golang.org/x/crypto v0.35.0 // indirect
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
 	golang.org/x/sync v0.11.0 // indirect
-	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
 	golang.org/x/text v0.22.0 // indirect
 )

examples/go.sum

@@ -3,10 +3,11 @@ github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuW
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/aymanbagabas/go-udiff v0.2.0 h1:TK0fH4MteXUDspT88n8CKzvK0X9O2xu9yQjWpi6yML8=
+github.com/aymanbagabas/go-udiff v0.2.0/go.mod h1:RE4Ex0qsGkTAJoQdQQCA0uG+nAzJO/pI/QwceO5fgrA=
 github.com/charmbracelet/bubbletea v0.25.0 h1:bAfwk7jRz7FKFl9RzlIULPkStffg5k6pNt5dywy4TcM=
 github.com/charmbracelet/bubbletea v0.25.0/go.mod h1:EN3QDR1T5ZdWmdfDzYcqOCAps45+QIJbLOBxmVNWNNg=
-github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc h1:4pZI35227imm7yK2bGPcfpFEmuY1gc2YSTShr4iJBfs=
-github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc/go.mod h1:X4/0JoqgTIPSFcRA/P6INZzIuyqdFY5rm8tb41s9okk=
+github.com/charmbracelet/colorprofile v0.3.0 h1:KtLh9uuu1RCt+Hml4s6Hz+kB1PfV3wi++1h5ia65yKQ=
+github.com/charmbracelet/colorprofile v0.3.0/go.mod h1:oHJ340RS2nmG1zRGPmhJKJ/jf4FPNNk0P39/wBPA1G0=
 github.com/charmbracelet/keygen v0.5.0 h1:XY0fsoYiCSM9axkrU+2ziE6u6YjJulo/b9Dghnw6MZc=
 github.com/charmbracelet/keygen v0.5.0/go.mod h1:DfvCgLHxZ9rJxdK0DGw3C/LkV4SgdGbnliHcObV3L+8=
 github.com/charmbracelet/log v0.4.0 h1:G9bQAcx8rWA2T3pWvx7YtPTPwgqpk7D68BX21IRW8ZM=
@@ -21,7 +22,8 @@ github.com/charmbracelet/x/cellbuf v0.0.13 h1:/KBBKHuVRbq1lYx5BzEHBAFBP8VcQzJejZ
 github.com/charmbracelet/x/cellbuf v0.0.13/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
 github.com/charmbracelet/x/errors v0.0.0-20240117030013-d31dba354651 h1:3RXpZWGWTOeVXCTv0Dnzxdv/MhNUkBfEcbaTY0zrTQI=
 github.com/charmbracelet/x/errors v0.0.0-20240117030013-d31dba354651/go.mod h1:2P0UgXMEa6TsToMSuFqKFQR+fZTO9CNGUNokkPatT/0=
-github.com/charmbracelet/x/exp/golden v0.0.0-20240806155701-69247e0abc2a h1:G99klV19u0QnhiizODirwVksQB91TJKV/UaTnACcG30=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250416155516-c8c095191e0d h1:CcFJvHqALQYa7qFm8Y5S3yWSwIQEPKD9E0e/iz5O2yw=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250416155516-c8c095191e0d/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
 github.com/charmbracelet/x/exp/term v0.0.0-20240328150354-ab9afc214dfd h1:HqBjkSFXXfW4IgX3TMKipWoPEN08T3Pi4SA/3DLss/U=
 github.com/charmbracelet/x/exp/term v0.0.0-20240328150354-ab9afc214dfd/go.mod h1:6GZ13FjIP6eOCqWU4lqgveGnYxQo9c3qBzHPeFu4HBE=
 github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
@@ -31,6 +33,7 @@ github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81/go.mod h1:Yyn
 github.com/creack/pty v1.1.21 h1:1/QdRyBaHHJP61QkWMXlOIBfsgdDeeKfK8SYVUWJKf0=
 github.com/creack/pty v1.1.21/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-logfmt/logfmt v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
 github.com/go-logfmt/logfmt v0.6.0/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
@@ -59,11 +62,13 @@ github.com/muesli/reflow v0.3.0/go.mod h1:pbwTDkVPibjO2kyvBQRBxTWEEGDGq0FlB1BIKt
 github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc=
 github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/wcharczuk/go-chart/v2 v2.1.0/go.mod h1:yx7MvAVNcP/kN9lKXM/NTce4au4DFN99j6i1OwDclNA=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
@@ -78,11 +83,12 @@ golang.org/x/sync v0.11.0 h1:GGz8+XQP4FvTTrjZPzNKTMFtSXH80RAzG+5ghFPgK9w=
 golang.org/x/sync v0.11.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
+golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
 golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
 golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

go.mod

@@ -4,24 +4,26 @@ retract v0.7.0 // v0.7.0 introduces a bug that causes some apps to freeze.
 
 retract v0.11.1 // v0.11.1 uses a broken version of x/ansi StringWidth that causes some lines to wrap incorrectly.
 
-go 1.18
+go 1.23.0
+
+toolchain go1.24.1
 
 require (
 	github.com/aymanbagabas/go-udiff v0.2.0
 	github.com/charmbracelet/x/ansi v0.8.0
 	github.com/charmbracelet/x/cellbuf v0.0.13
-	github.com/charmbracelet/x/exp/golden v0.0.0-20240806155701-69247e0abc2a
+	github.com/charmbracelet/x/exp/golden v0.0.0-20250416155516-c8c095191e0d
 	github.com/muesli/termenv v0.16.0
 	github.com/rivo/uniseg v0.4.7
 )
 
 require (
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
-	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
+	github.com/charmbracelet/colorprofile v0.3.0 // indirect
 	github.com/charmbracelet/x/term v0.2.1 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
 )

go.sum

@@ -2,14 +2,14 @@ github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiE
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/aymanbagabas/go-udiff v0.2.0 h1:TK0fH4MteXUDspT88n8CKzvK0X9O2xu9yQjWpi6yML8=
 github.com/aymanbagabas/go-udiff v0.2.0/go.mod h1:RE4Ex0qsGkTAJoQdQQCA0uG+nAzJO/pI/QwceO5fgrA=
-github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc h1:4pZI35227imm7yK2bGPcfpFEmuY1gc2YSTShr4iJBfs=
-github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc/go.mod h1:X4/0JoqgTIPSFcRA/P6INZzIuyqdFY5rm8tb41s9okk=
+github.com/charmbracelet/colorprofile v0.3.0 h1:KtLh9uuu1RCt+Hml4s6Hz+kB1PfV3wi++1h5ia65yKQ=
+github.com/charmbracelet/colorprofile v0.3.0/go.mod h1:oHJ340RS2nmG1zRGPmhJKJ/jf4FPNNk0P39/wBPA1G0=
 github.com/charmbracelet/x/ansi v0.8.0 h1:9GTq3xq9caJW8ZrBTe0LIe2fvfLR/bYXKTx2llXn7xE=
 github.com/charmbracelet/x/ansi v0.8.0/go.mod h1:wdYl/ONOLHLIVmQaxbIYEC/cRKOQyjTkowiI4blgS9Q=
 github.com/charmbracelet/x/cellbuf v0.0.13 h1:/KBBKHuVRbq1lYx5BzEHBAFBP8VcQzJejZ/IA3iR28k=
 github.com/charmbracelet/x/cellbuf v0.0.13/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
-github.com/charmbracelet/x/exp/golden v0.0.0-20240806155701-69247e0abc2a h1:G99klV19u0QnhiizODirwVksQB91TJKV/UaTnACcG30=
-github.com/charmbracelet/x/exp/golden v0.0.0-20240806155701-69247e0abc2a/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250416155516-c8c095191e0d h1:CcFJvHqALQYa7qFm8Y5S3yWSwIQEPKD9E0e/iz5O2yw=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250416155516-c8c095191e0d/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
 github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
 github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
@@ -26,6 +26,7 @@ github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUc
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
+golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=

table/table.go

@@ -2,15 +2,24 @@
 package table
 
 import (
+	"slices"
 	"strings"
 
 	"github.com/charmbracelet/lipgloss"
 	"github.com/charmbracelet/x/ansi"
 )
 
-// HeaderRow denotes the header's row index used when rendering headers. Use
-// this value when looking to customize header styles in StyleFunc.
-const HeaderRow int = -1
+const (
+	// HeaderRow denotes the header's row index used when rendering headers. Use
+	// this value when looking to customize header styles in StyleFunc.
+	HeaderRow int = -1
+	// FirstCol stores the index of the first column in a table.
+	FirstCol int = 0
+	// NoBorder is used to fill a gap with repeated spaces instead of drawing a border.
+	NoBorder string = " "
+	// EmptyCell is used to clear a cell value.
+	EmptyCell string = ""
+)
 
 // StyleFunc is the style function that determines the style of a Cell.
 //
@@ -46,13 +55,14 @@ type Table struct {
 	styleFunc StyleFunc
 	border    lipgloss.Border
 
-	borderTop    bool
-	borderBottom bool
-	borderLeft   bool
-	borderRight  bool
-	borderHeader bool
-	borderColumn bool
-	borderRow    bool
+	borderTop          bool
+	borderBottom       bool
+	borderLeft         bool
+	borderRight        bool
+	borderHeader       bool
+	borderColumn       bool
+	borderRow          bool
+	borderMergeColumns []int
 
 	borderStyle lipgloss.Style
 	headers     []string
@@ -190,6 +200,16 @@ func (t *Table) BorderRow(v bool) *Table {
 	return t
 }
 
+// BorderColumnMerge sets the columns where adjacent vertical cells that contain
+// the same data get merged into a single cell.
+// Prerequesite: BorderRow and BorderColumn must be set to true.
+func (t *Table) BorderMergeColumns(cols ...int) *Table {
+	if t.borderRow && t.borderColumn {
+		t.borderMergeColumns = cols
+	}
+	return t
+}
+
 // BorderStyle sets the style for the table border.
 func (t *Table) BorderStyle(style lipgloss.Style) *Table {
 	t.borderStyle = style
@@ -426,14 +446,11 @@ func (t *Table) constructRows(availableLines int) string {
 	return sb.String()
 }
 
-// constructRow constructs the row for the table given an index and row data
-// based on the current configuration. If isOverflow is true, the row is
-// rendered as an overflow row (using ellipsis).
-func (t *Table) constructRow(index int, isOverflow bool) string {
+func (t *Table) constructRow(row int, isOverflow bool) string {
 	var s strings.Builder
 
 	hasHeaders := len(t.headers) > 0
-	height := t.heights[index+btoi(hasHeaders)]
+	height := t.heights[row+btoi(hasHeaders)]
 	if isOverflow {
 		height = 1
 	}
@@ -444,25 +461,33 @@ func (t *Table) constructRow(index int, isOverflow bool) string {
 		cells = append(cells, left)
 	}
 
-	for c := 0; c < t.data.Columns(); c++ {
+	verticalCellsEqual := func(row, col int) bool { return t.data.At(row-1, col) == t.data.At(row, col) }
+	modifyCell := func(col int, cell string) string {
+		if row > 0 && slices.Contains(t.borderMergeColumns, col) && verticalCellsEqual(row, col) {
+			return EmptyCell // if merging column, clear cells with identical data excluding the first occurrence
+		}
+		return cell
+	}
+
+	for col := 0; col < t.data.Columns(); col++ {
 		cell := "…"
 		if !isOverflow {
-			cell = t.data.At(index, c)
+			cell = t.data.At(row, col)
 		}
 
-		cellStyle := t.style(index, c)
+		cellStyle := t.style(row, col)
 		if !t.wrap {
-			cell = t.truncateCell(cell, index, c)
+			cell = t.truncateCell(cell, row, col)
 		}
 		cells = append(cells, cellStyle.
 			// Account for the margins in the cell sizing.
 			Height(height-cellStyle.GetVerticalMargins()).
 			MaxHeight(height).
-			Width(t.widths[c]-cellStyle.GetHorizontalMargins()).
-			MaxWidth(t.widths[c]).
-			Render(cell))
+			Width(t.widths[col]-cellStyle.GetHorizontalMargins()).
+			MaxWidth(t.widths[col]).
+			Render(modifyCell(col, cell)))
 
-		if c < t.data.Columns()-1 && t.borderColumn {
+		if col < t.data.Columns()-1 && t.borderColumn {
 			cells = append(cells, left)
 		}
 	}
@@ -478,18 +503,66 @@ func (t *Table) constructRow(index int, isOverflow bool) string {
 
 	s.WriteString(lipgloss.JoinHorizontal(lipgloss.Top, cells...) + "\n")
 
-	if t.borderRow && index < t.data.Rows()-1 && !isOverflow {
+	t.drawRowBorders(&s, row, isOverflow)
+
+	return s.String()
+}
+
+// Draws the borders separating rows for singular row.
+func (t *Table) drawRowBorders(s *strings.Builder, row int, isOverflow bool) {
+	if t.borderRow && row < t.data.Rows()-1 && !isOverflow {
+		t.drawLeftmostBorder(s, row)
+		t.drawMiddleBorders(s, row)
+		t.drawRightmostBorders(s, row)
+	}
+}
+
+// Draws the leftmost border intersection for a singular row.
+func (t *Table) drawLeftmostBorder(s *strings.Builder, row int) {
+	if slices.Contains(t.borderMergeColumns, FirstCol) && t.verticalCellsEqual(row, FirstCol) {
+		s.WriteString(t.borderStyle.Render(t.border.Left))
+	} else {
 		s.WriteString(t.borderStyle.Render(t.border.MiddleLeft))
-		for i := 0; i < len(t.widths); i++ {
-			s.WriteString(t.borderStyle.Render(strings.Repeat(t.border.Bottom, t.widths[i])))
-			if i < len(t.widths)-1 && t.borderColumn {
-				s.WriteString(t.borderStyle.Render(t.border.Middle))
-			}
+	}
+}
+
+// Draws all the horizontal and intersection borders for a singular row, exluding the last column.
+func (t *Table) drawMiddleBorders(s *strings.Builder, row int) {
+	for col := 0; col < len(t.widths)-1; col++ {
+		if !t.borderColumn {
+			s.WriteString(t.borderStyle.Render(strings.Repeat(t.border.Bottom, t.widths[col])))
+		} else if slices.Contains(t.borderMergeColumns, col) && slices.Contains(t.borderMergeColumns, col+1) &&
+			t.verticalCellsEqual(row, col) && t.verticalCellsEqual(row, col+1) {
+			s.WriteString(t.borderStyle.Render(strings.Repeat(NoBorder, t.widths[col])))
+			s.WriteString(t.borderStyle.Render(t.border.Left)) // |
+		} else if slices.Contains(t.borderMergeColumns, col) && t.verticalCellsEqual(row, col) {
+			s.WriteString(t.borderStyle.Render(strings.Repeat(NoBorder, t.widths[col])))
+			s.WriteString(t.borderStyle.Render(t.border.MiddleLeft)) // |-
+		} else if slices.Contains(t.borderMergeColumns, col+1) && t.verticalCellsEqual(row, col+1) {
+			s.WriteString(t.borderStyle.Render(strings.Repeat(t.border.Bottom, t.widths[col])))
+			s.WriteString(t.borderStyle.Render(t.border.MiddleRight)) // -|
+		} else {
+			s.WriteString(t.borderStyle.Render(strings.Repeat(t.border.Bottom, t.widths[col])))
+			s.WriteString(t.borderStyle.Render(t.border.Middle)) // -|-
 		}
-		s.WriteString(t.borderStyle.Render(t.border.MiddleRight) + "\n")
 	}
+}
 
-	return s.String()
+// Draws the rightmost column's horizontal and intersection border for a singular row.
+func (t *Table) drawRightmostBorders(s *strings.Builder, row int) {
+	lastCol := len(t.widths) - 1
+	if slices.Contains(t.borderMergeColumns, lastCol) && t.verticalCellsEqual(row, lastCol) {
+		s.WriteString(t.borderStyle.Render(strings.Repeat(NoBorder, t.widths[lastCol])))
+		s.WriteString(t.borderStyle.Render(t.border.Right) + "\n") // |
+	} else {
+		s.WriteString(t.borderStyle.Render(strings.Repeat(t.border.Bottom, t.widths[lastCol])))
+		s.WriteString(t.borderStyle.Render(t.border.MiddleRight) + "\n") // -|
+	}
+}
+
+// Returns true if the cell at (row, col) and the cell below it contain the same data.
+func (t *Table) verticalCellsEqual(row, col int) bool {
+	return t.data.At(row, col) == t.data.At(row+1, col)
 }
 
 func (t *Table) truncateCell(cell string, rowIndex, colIndex int) string {