Add --{header,header-lines,footer}-border=inline

New BorderShape that embeds the section inside the --list-border frame, joined to the list content by a horizontal separator with T-junctions where the list shape has side borders. Requires a list border with both top and bottom segments; falls back to 'line' otherwise. Stacks when multiple sections are inline. Sections inherit --color list-border by default and are colored as a uniform block via their own --color *-border and *-bg. Incompatible with --header-first. --header-border=inline requires --header-lines-border to be inline or unset.
2026-07-19 22:50:35 +08:00 · 2026-04-20 00:47:16 +09:00
parent ef6eba1b89
commit d754cfab87
9 changed files with 906 additions and 242 deletions
@@ -1129,127 +1129,142 @@ func (w *LightWindow) DrawHBorder() {
 	w.drawBorder(true)
 }

+// drawHLine fills row `row` with `line` between optional left/right caps.
+// A zero rune means "no cap"; caps are placed at the very edges of `w`.
+func (w *LightWindow) drawHLine(row int, line, leftCap, rightCap rune, color ColorPair) {
+	w.Move(row, 0)
+	hw := runeWidth(line)
+	width := w.width
+	if leftCap != 0 {
+		w.CPrint(color, string(leftCap))
+		width -= runeWidth(leftCap)
+	}
+	if rightCap != 0 {
+		width -= runeWidth(rightCap)
+	}
+	if width < 0 {
+		width = 0
+	}
+	inner := width / hw
+	rem := width - inner*hw
+	w.CPrint(color, repeat(line, inner)+repeat(' ', rem))
+	if rightCap != 0 {
+		w.CPrint(color, string(rightCap))
+	}
+}
+
+func (w *LightWindow) DrawHSeparator(row int, windowType WindowType, useBottom bool) {
+	if w.height == 0 {
+		return
+	}
+	shape := w.border.shape
+	if shape == BorderNone {
+		return
+	}
+	color := BorderColor(windowType)
+	line := w.border.top
+	if useBottom {
+		line = w.border.bottom
+	}
+	var leftCap, rightCap rune
+	if shape.HasLeft() || shape.HasRight() {
+		leftCap = w.border.leftMid
+		rightCap = w.border.rightMid
+	}
+	w.drawHLine(row, line, leftCap, rightCap, color)
+}
+
+func (w *LightWindow) PaintSectionFrame(topContent, bottomContent int, windowType WindowType, edge SectionEdge) {
+	if w.height == 0 || w.border.shape == BorderNone {
+		return
+	}
+	color := BorderColor(windowType)
+	shape := w.border.shape
+	hasLeft := shape.HasLeft()
+	hasRight := shape.HasRight()
+	rightW := runeWidth(w.border.right)
+	// Content rows: overpaint left/right verticals + their 1-char margin.
+	for row := topContent; row <= bottomContent; row++ {
+		if hasLeft {
+			w.Move(row, 0)
+			w.CPrint(color, string(w.border.left)+" ")
+		}
+		if hasRight {
+			w.Move(row, w.width-rightW-1)
+			w.CPrint(color, " "+string(w.border.right))
+		}
+	}
+	if edge == SectionEdgeTop && shape.HasTop() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.border.topLeft
+		}
+		if hasRight {
+			rightCap = w.border.topRight
+		}
+		w.drawHLine(0, w.border.top, leftCap, rightCap, color)
+	}
+	if edge == SectionEdgeBottom && shape.HasBottom() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.border.bottomLeft
+		}
+		if hasRight {
+			rightCap = w.border.bottomRight
+		}
+		w.drawHLine(w.height-1, w.border.bottom, leftCap, rightCap, color)
+	}
+}
+
 func (w *LightWindow) drawBorder(onlyHorizontal bool) {
 	if w.height == 0 {
 		return
 	}
-	switch w.border.shape {
-	case BorderRounded, BorderSharp, BorderBold, BorderBlock, BorderThinBlock, BorderDouble:
-		w.drawBorderAround(onlyHorizontal)
-	case BorderHorizontal:
-		w.drawBorderHorizontal(true, true)
-	case BorderVertical:
-		if onlyHorizontal {
-			return
-		}
-		w.drawBorderVertical(true, true)
-	case BorderTop:
-		w.drawBorderHorizontal(true, false)
-	case BorderBottom:
-		w.drawBorderHorizontal(false, true)
-	case BorderLeft:
-		if onlyHorizontal {
-			return
-		}
-		w.drawBorderVertical(true, false)
-	case BorderRight:
-		if onlyHorizontal {
-			return
-		}
-		w.drawBorderVertical(false, true)
+	shape := w.border.shape
+	if shape == BorderNone {
+		return
 	}
-}
+	color := BorderColor(w.windowType)
+	hasLeft := shape.HasLeft()
+	hasRight := shape.HasRight()

-func (w *LightWindow) drawBorderHorizontal(top, bottom bool) {
-	color := ColBorder
-	switch w.windowType {
-	case WindowList:
-		color = ColListBorder
-	case WindowInput:
-		color = ColInputBorder
-	case WindowHeader:
-		color = ColHeaderBorder
-	case WindowFooter:
-		color = ColFooterBorder
-	case WindowPreview:
-		color = ColPreviewBorder
-	}
-	hw := runeWidth(w.border.top)
-	if top {
-		w.Move(0, 0)
-		w.CPrint(color, repeat(w.border.top, w.width/hw))
-	}
-
-	if bottom {
-		w.Move(w.height-1, 0)
-		w.CPrint(color, repeat(w.border.bottom, w.width/hw))
-	}
-}
-
-func (w *LightWindow) drawBorderVertical(left, right bool) {
-	vw := runeWidth(w.border.left)
-	color := ColBorder
-	switch w.windowType {
-	case WindowList:
-		color = ColListBorder
-	case WindowInput:
-		color = ColInputBorder
-	case WindowHeader:
-		color = ColHeaderBorder
-	case WindowFooter:
-		color = ColFooterBorder
-	case WindowPreview:
-		color = ColPreviewBorder
-	}
-	for y := 0; y < w.height; y++ {
-		if left {
-			w.Move(y, 0)
-			w.CPrint(color, string(w.border.left))
-			w.CPrint(color, " ") // Margin
+	if shape.HasTop() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.border.topLeft
 		}
-		if right {
-			w.Move(y, w.width-vw-1)
-			w.CPrint(color, " ") // Margin
-			w.CPrint(color, string(w.border.right))
+		if hasRight {
+			rightCap = w.border.topRight
 		}
+		w.drawHLine(0, w.border.top, leftCap, rightCap, color)
 	}
-}
-
-func (w *LightWindow) drawBorderAround(onlyHorizontal bool) {
-	w.Move(0, 0)
-	color := ColBorder
-	switch w.windowType {
-	case WindowList:
-		color = ColListBorder
-	case WindowInput:
-		color = ColInputBorder
-	case WindowHeader:
-		color = ColHeaderBorder
-	case WindowFooter:
-		color = ColFooterBorder
-	case WindowPreview:
-		color = ColPreviewBorder
-	}
-	hw := runeWidth(w.border.top)
-	tcw := runeWidth(w.border.topLeft) + runeWidth(w.border.topRight)
-	bcw := runeWidth(w.border.bottomLeft) + runeWidth(w.border.bottomRight)
-	rem := (w.width - tcw) % hw
-	w.CPrint(color, string(w.border.topLeft)+repeat(w.border.top, (w.width-tcw)/hw)+repeat(' ', rem)+string(w.border.topRight))
-	if !onlyHorizontal {
+	if !onlyHorizontal && (hasLeft || hasRight) {
 		vw := runeWidth(w.border.left)
-		for y := 1; y < w.height-1; y++ {
-			w.Move(y, 0)
-			w.CPrint(color, string(w.border.left))
-			w.CPrint(color, " ") // Margin
-
-			w.Move(y, w.width-vw-1)
-			w.CPrint(color, " ") // Margin
-			w.CPrint(color, string(w.border.right))
+		for y := 0; y < w.height; y++ {
+			// Corner rows are already painted by drawHLine above / below.
+			if (y == 0 && shape.HasTop()) || (y == w.height-1 && shape.HasBottom()) {
+				continue
+			}
+			if hasLeft {
+				w.Move(y, 0)
+				w.CPrint(color, string(w.border.left)+" ")
+			}
+			if hasRight {
+				w.Move(y, w.width-vw-1)
+				w.CPrint(color, " "+string(w.border.right))
+			}
 		}
 	}
-	w.Move(w.height-1, 0)
-	rem = (w.width - bcw) % hw
-	w.CPrint(color, string(w.border.bottomLeft)+repeat(w.border.bottom, (w.width-bcw)/hw)+repeat(' ', rem)+string(w.border.bottomRight))
+	if shape.HasBottom() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.border.bottomLeft
+		}
+		if hasRight {
+			rightCap = w.border.bottomRight
+		}
+		w.drawHLine(w.height-1, w.border.bottom, leftCap, rightCap, color)
+	}
 }

 func (w *LightWindow) csi(code string) string {
@@ -1017,6 +1017,113 @@ func (w *TcellWindow) DrawHBorder() {
 	w.drawBorder(true)
 }

+// borderStyleFor returns the tcell.Style used to draw borders for `wt`, honoring
+// whether the window is rendering with colors.
+func (w *TcellWindow) borderStyleFor(wt WindowType) tcell.Style {
+	if !w.color {
+		return w.normal.style()
+	}
+	return BorderColor(wt).style()
+}
+
+// drawHLine fills row `y` with `line` between optional left/right caps.
+// A zero rune means "no cap"; caps are placed at the very edges of `w`.
+// tcell has an issue displaying two overlapping wide runes, so the line
+// stops before the cap position rather than overpainting.
+func (w *TcellWindow) drawHLine(y int, line, leftCap, rightCap rune, style tcell.Style) {
+	left := w.left
+	right := left + w.width
+	hw := runeWidth(line)
+	lw := 0
+	rw := 0
+	if leftCap != 0 {
+		lw = runeWidth(leftCap)
+	}
+	if rightCap != 0 {
+		rw = runeWidth(rightCap)
+	}
+	for x := left + lw; x <= right-rw-hw; x += hw {
+		_screen.SetContent(x, y, line, nil, style)
+	}
+	if leftCap != 0 {
+		_screen.SetContent(left, y, leftCap, nil, style)
+	}
+	if rightCap != 0 {
+		_screen.SetContent(right-rw, y, rightCap, nil, style)
+	}
+}
+
+func (w *TcellWindow) DrawHSeparator(row int, windowType WindowType, useBottom bool) {
+	if w.height == 0 {
+		return
+	}
+	shape := w.borderStyle.shape
+	if shape == BorderNone {
+		return
+	}
+	style := w.borderStyleFor(windowType)
+	line := w.borderStyle.top
+	if useBottom {
+		line = w.borderStyle.bottom
+	}
+	var leftCap, rightCap rune
+	if shape.HasLeft() || shape.HasRight() {
+		leftCap = w.borderStyle.leftMid
+		rightCap = w.borderStyle.rightMid
+	}
+	w.drawHLine(w.top+row, line, leftCap, rightCap, style)
+}
+
+func (w *TcellWindow) PaintSectionFrame(topContent, bottomContent int, windowType WindowType, edge SectionEdge) {
+	if w.height == 0 {
+		return
+	}
+	shape := w.borderStyle.shape
+	if shape == BorderNone {
+		return
+	}
+	style := w.borderStyleFor(windowType)
+	left := w.left
+	right := left + w.width
+	hasLeft := shape.HasLeft()
+	hasRight := shape.HasRight()
+	leftW := runeWidth(w.borderStyle.left)
+	rightW := runeWidth(w.borderStyle.right)
+	// Content rows: overpaint the left and right verticals (+ their 1-char margin) in
+	// the section's color. Inner margin stays at whatever bg the sub-window set.
+	for row := topContent; row <= bottomContent; row++ {
+		y := w.top + row
+		if hasLeft {
+			_screen.SetContent(left, y, w.borderStyle.left, nil, style)
+			_screen.SetContent(left+leftW, y, ' ', nil, style)
+		}
+		if hasRight {
+			_screen.SetContent(right-rightW-1, y, ' ', nil, style)
+			_screen.SetContent(right-rightW, y, w.borderStyle.right, nil, style)
+		}
+	}
+	if edge == SectionEdgeTop && shape.HasTop() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.borderStyle.topLeft
+		}
+		if hasRight {
+			rightCap = w.borderStyle.topRight
+		}
+		w.drawHLine(w.top, w.borderStyle.top, leftCap, rightCap, style)
+	}
+	if edge == SectionEdgeBottom && shape.HasBottom() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.borderStyle.bottomLeft
+		}
+		if hasRight {
+			rightCap = w.borderStyle.bottomRight
+		}
+		w.drawHLine(w.top+w.height-1, w.borderStyle.bottom, leftCap, rightCap, style)
+	}
+}
+
 func (w *TcellWindow) drawBorder(onlyHorizontal bool) {
 	if w.height == 0 {
 		return
@@ -1031,72 +1138,44 @@ func (w *TcellWindow) drawBorder(onlyHorizontal bool) {
 	top := w.top
 	bot := top + w.height

-	var style tcell.Style
-	if w.color {
-		switch w.windowType {
-		case WindowBase:
-			style = ColBorder.style()
-		case WindowList:
-			style = ColListBorder.style()
-		case WindowHeader:
-			style = ColHeaderBorder.style()
-		case WindowFooter:
-			style = ColFooterBorder.style()
-		case WindowInput:
-			style = ColInputBorder.style()
-		case WindowPreview:
-			style = ColPreviewBorder.style()
-		}
-	} else {
-		style = w.normal.style()
-	}
+	style := w.borderStyleFor(w.windowType)

-	hw := runeWidth(w.borderStyle.top)
-	switch shape {
-	case BorderRounded, BorderSharp, BorderBold, BorderBlock, BorderThinBlock, BorderDouble, BorderHorizontal, BorderTop:
-		max := right - 2*hw
-		if shape == BorderHorizontal || shape == BorderTop {
-			max = right - hw
+	hasLeft := shape.HasLeft()
+	hasRight := shape.HasRight()
+
+	if shape.HasTop() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.borderStyle.topLeft
 		}
-		// tcell has an issue displaying two overlapping wide runes
-		// e.g.  SetContent(  HH  )
-		//       SetContent(   TR )
-		//       ==================
-		//                 (  HH  ) => TR is ignored
-		for x := left; x <= max; x += hw {
-			_screen.SetContent(x, top, w.borderStyle.top, nil, style)
+		if hasRight {
+			rightCap = w.borderStyle.topRight
 		}
+		w.drawHLine(top, w.borderStyle.top, leftCap, rightCap, style)
 	}
-	switch shape {
-	case BorderRounded, BorderSharp, BorderBold, BorderBlock, BorderThinBlock, BorderDouble, BorderHorizontal, BorderBottom:
-		max := right - 2*hw
-		if shape == BorderHorizontal || shape == BorderBottom {
-			max = right - hw
+	if shape.HasBottom() {
+		var leftCap, rightCap rune
+		if hasLeft {
+			leftCap = w.borderStyle.bottomLeft
 		}
-		for x := left; x <= max; x += hw {
-			_screen.SetContent(x, bot-1, w.borderStyle.bottom, nil, style)
+		if hasRight {
+			rightCap = w.borderStyle.bottomRight
 		}
+		w.drawHLine(bot-1, w.borderStyle.bottom, leftCap, rightCap, style)
 	}
 	if !onlyHorizontal {
-		switch shape {
-		case BorderRounded, BorderSharp, BorderBold, BorderBlock, BorderThinBlock, BorderDouble, BorderVertical, BorderLeft:
-			for y := top; y < bot; y++ {
+		vw := runeWidth(w.borderStyle.right)
+		for y := top; y < bot; y++ {
+			// Corner rows are already painted by drawHLine above / below.
+			if (y == top && shape.HasTop()) || (y == bot-1 && shape.HasBottom()) {
+				continue
+			}
+			if hasLeft {
 				_screen.SetContent(left, y, w.borderStyle.left, nil, style)
 			}
-		}
-		switch shape {
-		case BorderRounded, BorderSharp, BorderBold, BorderBlock, BorderThinBlock, BorderDouble, BorderVertical, BorderRight:
-			vw := runeWidth(w.borderStyle.right)
-			for y := top; y < bot; y++ {
+			if hasRight {
 				_screen.SetContent(right-vw, y, w.borderStyle.right, nil, style)
 			}
 		}
 	}
-	switch shape {
-	case BorderRounded, BorderSharp, BorderBold, BorderBlock, BorderThinBlock, BorderDouble:
-		_screen.SetContent(left, top, w.borderStyle.topLeft, nil, style)
-		_screen.SetContent(right-runeWidth(w.borderStyle.topRight), top, w.borderStyle.topRight, nil, style)
-		_screen.SetContent(left, bot-1, w.borderStyle.bottomLeft, nil, style)
-		_screen.SetContent(right-runeWidth(w.borderStyle.bottomRight), bot-1, w.borderStyle.bottomRight, nil, style)
-	}
 }
@@ -595,11 +595,12 @@ const (
 	BorderBottom
 	BorderLeft
 	BorderRight
+	BorderInline
 )

 func (s BorderShape) HasLeft() bool {
 	switch s {
-	case BorderNone, BorderPhantom, BorderLine, BorderRight, BorderTop, BorderBottom, BorderHorizontal: // No Left
+	case BorderNone, BorderPhantom, BorderLine, BorderInline, BorderRight, BorderTop, BorderBottom, BorderHorizontal: // No Left
 		return false
 	}
 	return true
@@ -607,7 +608,7 @@ func (s BorderShape) HasLeft() bool {

 func (s BorderShape) HasRight() bool {
 	switch s {
-	case BorderNone, BorderPhantom, BorderLine, BorderLeft, BorderTop, BorderBottom, BorderHorizontal: // No right
+	case BorderNone, BorderPhantom, BorderLine, BorderInline, BorderLeft, BorderTop, BorderBottom, BorderHorizontal: // No right
 		return false
 	}
 	return true
@@ -615,7 +616,7 @@ func (s BorderShape) HasRight() bool {

 func (s BorderShape) HasTop() bool {
 	switch s {
-	case BorderNone, BorderPhantom, BorderLine, BorderLeft, BorderRight, BorderBottom, BorderVertical: // No top
+	case BorderNone, BorderPhantom, BorderLine, BorderInline, BorderLeft, BorderRight, BorderBottom, BorderVertical: // No top
 		return false
 	}
 	return true
@@ -623,7 +624,7 @@ func (s BorderShape) HasTop() bool {

 func (s BorderShape) HasBottom() bool {
 	switch s {
-	case BorderNone, BorderPhantom, BorderLine, BorderLeft, BorderRight, BorderTop, BorderVertical: // No bottom
+	case BorderNone, BorderPhantom, BorderLine, BorderInline, BorderLeft, BorderRight, BorderTop, BorderVertical: // No bottom
 		return false
 	}
 	return true
@@ -643,6 +644,8 @@ type BorderStyle struct {
 	topRight    rune
 	bottomLeft  rune
 	bottomRight rune
+	leftMid     rune
+	rightMid    rune
 }

 type BorderCharacter int
@@ -658,7 +661,9 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topLeft:     ' ',
 			topRight:    ' ',
 			bottomLeft:  ' ',
-			bottomRight: ' '}
+			bottomRight: ' ',
+			leftMid:     ' ',
+			rightMid:    ' '}
 	}
 	if !unicode {
 		return BorderStyle{
@@ -671,6 +676,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topRight:    '+',
 			bottomLeft:  '+',
 			bottomRight: '+',
+			leftMid:     '+',
+			rightMid:    '+',
 		}
 	}
 	switch shape {
@@ -685,6 +692,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topRight:    '┐',
 			bottomLeft:  '└',
 			bottomRight: '┘',
+			leftMid:     '├',
+			rightMid:    '┤',
 		}
 	case BorderBold:
 		return BorderStyle{
@@ -697,6 +706,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topRight:    '┓',
 			bottomLeft:  '┗',
 			bottomRight: '┛',
+			leftMid:     '┣',
+			rightMid:    '┫',
 		}
 	case BorderBlock:
 		// ▛▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▜
@@ -712,6 +723,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topRight:    '▜',
 			bottomLeft:  '▙',
 			bottomRight: '▟',
+			leftMid:     '▌',
+			rightMid:    '▐',
 		}

 	case BorderThinBlock:
@@ -728,6 +741,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topRight:    '🭾',
 			bottomLeft:  '🭼',
 			bottomRight: '🭿',
+			leftMid:     '▏',
+			rightMid:    '▕',
 		}

 	case BorderDouble:
@@ -741,6 +756,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			topRight:    '╗',
 			bottomLeft:  '╚',
 			bottomRight: '╝',
+			leftMid:     '╠',
+			rightMid:    '╣',
 		}
 	}
 	return BorderStyle{
@@ -753,6 +770,8 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 		topRight:    '╮',
 		bottomLeft:  '╰',
 		bottomRight: '╯',
+		leftMid:     '├',
+		rightMid:    '┤',
 	}
 }

@@ -774,6 +793,35 @@ const (
 	WindowFooter
 )

+// BorderColor returns the ColorPair used to draw borders for the given WindowType.
+func BorderColor(wt WindowType) ColorPair {
+	switch wt {
+	case WindowList:
+		return ColListBorder
+	case WindowInput:
+		return ColInputBorder
+	case WindowHeader:
+		return ColHeaderBorder
+	case WindowFooter:
+		return ColFooterBorder
+	case WindowPreview:
+		return ColPreviewBorder
+	}
+	return ColBorder
+}
+
+// SectionEdge selects which outer edge of the frame an inline section
+// should claim when PaintSectionFrame overpaints its adjacent border.
+// SectionEdgeNone paints only the inner verticals (for sections that
+// don't touch the outer top or bottom).
+type SectionEdge int
+
+const (
+	SectionEdgeNone SectionEdge = iota
+	SectionEdgeTop
+	SectionEdgeBottom
+)
+
 type Renderer interface {
 	DefaultTheme() *ColorTheme
 	Init() error
@@ -811,6 +859,19 @@ type Window interface {

 	DrawBorder()
 	DrawHBorder()
+	// DrawHSeparator draws an inline horizontal separator at `row` (relative to the
+	// window's top) using the color for `windowType`. The separator is conceptually
+	// the section's inner edge (e.g. the bottom border of an inline header), so the
+	// whole row including junctions carries the section's fg + bg. When useBottom is
+	// true the `bottom` horizontal char is used instead of `top`; for thinblock/block
+	// styles this keeps the thin line bonded to the list content on the opposite side.
+	DrawHSeparator(row int, windowType WindowType, useBottom bool)
+	// PaintSectionFrame overpaints the border cells around the rows [topContent,
+	// bottomContent] (inclusive, relative to the window's top) with the color for
+	// `windowType`. When edge is SectionEdgeTop / SectionEdgeBottom, the
+	// corresponding outer horizontal (+ corners) is also painted, letting the
+	// inline section claim that edge of the outer frame.
+	PaintSectionFrame(topContent, bottomContent int, windowType WindowType, edge SectionEdge)
 	Refresh()
 	FinishFill()

@@ -1166,7 +1227,7 @@ func init() {
 	}
 }

-func InitTheme(theme *ColorTheme, baseTheme *ColorTheme, boldify bool, forceBlack bool, hasInputWindow bool, hasHeaderWindow bool) {
+func InitTheme(theme *ColorTheme, baseTheme *ColorTheme, boldify bool, forceBlack bool, hasInputWindow bool, hasHeaderWindow bool, headerInline bool, footerInline bool) {
 	if forceBlack {
 		theme.Bg = ColorAttr{colBlack, AttrUndefined}
 	}
@@ -1300,11 +1361,22 @@ func InitTheme(theme *ColorTheme, baseTheme *ColorTheme, boldify bool, forceBlac
 	} else {
 		theme.HeaderBg = o(theme.Bg, theme.ListBg)
 	}
-	theme.HeaderBorder = o(theme.Border, theme.HeaderBorder)
+	// Inline header/footer borders sit inside the list frame, so default their color
+	// to the list-border color when the user has not explicitly set it. The inline
+	// separator then matches the surrounding frame.
+	headerBorderFallback := theme.Border
+	if headerInline {
+		headerBorderFallback = theme.ListBorder
+	}
+	theme.HeaderBorder = o(headerBorderFallback, theme.HeaderBorder)
 	theme.HeaderLabel = o(theme.BorderLabel, theme.HeaderLabel)

 	theme.FooterBg = o(theme.Bg, theme.FooterBg)
-	theme.FooterBorder = o(theme.Border, theme.FooterBorder)
+	footerBorderFallback := theme.Border
+	if footerInline {
+		footerBorderFallback = theme.ListBorder
+	}
+	theme.FooterBorder = o(footerBorderFallback, theme.FooterBorder)
 	theme.FooterLabel = o(theme.BorderLabel, theme.FooterLabel)

 	if theme.Nomatch.IsUndefined() {