Add --border=[bold|double] and --preview-window=border-[bold|double]

src/tui/light.go

@@ -712,7 +712,7 @@ func (r *LightRenderer) NewWindow(top int, left int, width int, height int, prev
 
 func (w *LightWindow) drawBorder() {
 	switch w.border.shape {
-	case BorderRounded, BorderSharp:
+	case BorderRounded, BorderSharp, BorderBold, BorderDouble:
 		w.drawBorderAround()
 	case BorderHorizontal:
 		w.drawBorderHorizontal(true, true)

src/tui/tcell.go

@@ -705,31 +705,31 @@ func (w *TcellWindow) drawBorder() {
 	}
 
 	switch shape {
-	case BorderRounded, BorderSharp, BorderHorizontal, BorderTop:
+	case BorderRounded, BorderSharp, BorderBold, BorderDouble, BorderHorizontal, BorderTop:
 		for x := left; x < right; x++ {
 			_screen.SetContent(x, top, w.borderStyle.horizontal, nil, style)
 		}
 	}
 	switch shape {
-	case BorderRounded, BorderSharp, BorderHorizontal, BorderBottom:
+	case BorderRounded, BorderSharp, BorderBold, BorderDouble, BorderHorizontal, BorderBottom:
 		for x := left; x < right; x++ {
 			_screen.SetContent(x, bot-1, w.borderStyle.horizontal, nil, style)
 		}
 	}
 	switch shape {
-	case BorderRounded, BorderSharp, BorderVertical, BorderLeft:
+	case BorderRounded, BorderSharp, BorderBold, BorderDouble, BorderVertical, BorderLeft:
 		for y := top; y < bot; y++ {
 			_screen.SetContent(left, y, w.borderStyle.vertical, nil, style)
 		}
 	}
 	switch shape {
-	case BorderRounded, BorderSharp, BorderVertical, BorderRight:
+	case BorderRounded, BorderSharp, BorderBold, BorderDouble, BorderVertical, BorderRight:
 		for y := top; y < bot; y++ {
 			_screen.SetContent(right-1, y, w.borderStyle.vertical, nil, style)
 		}
 	}
 	switch shape {
-	case BorderRounded, BorderSharp:
+	case BorderRounded, BorderSharp, BorderBold, BorderDouble:
 		_screen.SetContent(left, top, w.borderStyle.topLeft, nil, style)
 		_screen.SetContent(right-1, top, w.borderStyle.topRight, nil, style)
 		_screen.SetContent(left, bot-1, w.borderStyle.bottomLeft, nil, style)

src/tui/tui.go

@@ -294,6 +294,8 @@ const (
 	BorderNone BorderShape = iota
 	BorderRounded
 	BorderSharp
+	BorderBold
+	BorderDouble
 	BorderHorizontal
 	BorderVertical
 	BorderTop
@@ -315,18 +317,19 @@ type BorderStyle struct {
 type BorderCharacter int
 
 func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
-	if unicode {
-		if shape == BorderRounded {
-			return BorderStyle{
-				shape:       shape,
-				horizontal:  '─',
-				vertical:    '│',
-				topLeft:     '╭',
-				topRight:    '╮',
-				bottomLeft:  '╰',
-				bottomRight: '╯',
-			}
+	if !unicode {
+		return BorderStyle{
+			shape:       shape,
+			horizontal:  '-',
+			vertical:    '|',
+			topLeft:     '+',
+			topRight:    '+',
+			bottomLeft:  '+',
+			bottomRight: '+',
 		}
+	}
+	switch shape {
+	case BorderSharp:
 		return BorderStyle{
 			shape:       shape,
 			horizontal:  '─',
@@ -336,15 +339,35 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 			bottomLeft:  '└',
 			bottomRight: '┘',
 		}
+	case BorderBold:
+		return BorderStyle{
+			shape:       shape,
+			horizontal:  '━',
+			vertical:    '┃',
+			topLeft:     '┏',
+			topRight:    '┓',
+			bottomLeft:  '┗',
+			bottomRight: '┛',
+		}
+	case BorderDouble:
+		return BorderStyle{
+			shape:       shape,
+			horizontal:  '═',
+			vertical:    '║',
+			topLeft:     '╔',
+			topRight:    '╗',
+			bottomLeft:  '╚',
+			bottomRight: '╝',
+		}
 	}
 	return BorderStyle{
 		shape:       shape,
-		horizontal:  '-',
-		vertical:    '|',
-		topLeft:     '+',
-		topRight:    '+',
-		bottomLeft:  '+',
-		bottomRight: '+',
+		horizontal:  '─',
+		vertical:    '│',
+		topLeft:     '╭',
+		topRight:    '╮',
+		bottomLeft:  '╰',
+		bottomRight: '╯',
 	}
 }