Add --border option to draw horizontal lines above and below the finder

Goes well with --height

10 files changed, 127 insertions, 60 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 37ede605..0ea9ee26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+0.16.4
+------
+- Added `--border` option to draw border above and below the finder
+- Bug fixes and improvements
+
 0.16.3
 ------
 - Fixed a bug where fzf incorrectly display the lines when straddling tab
diff --git a/README.md b/README.md
index 303ca4cd..c016de49 100644
--- a/README.md
+++ b/README.md
@@ -141,10 +141,10 @@ vim $(fzf --height 40% --reverse)
 ```
 
 You can add these options to `$FZF_DEFAULT_OPTS` so that they're applied by
-default.
+default. For example,
 
 ```sh
-export FZF_DEFAULT_OPTS='--height 40% --reverse'
+export FZF_DEFAULT_OPTS='--height 40% --reverse --border'
 ```
 
 #### Search syntax
diff --git a/man/man1/fzf.1 b/man/man1/fzf.1
index f7d3a441..74ac2a49 100644
--- a/man/man1/fzf.1
+++ b/man/man1/fzf.1
@@ -156,6 +156,9 @@ Ignored when \fB--height\fR is not specified.
 .B "--reverse"
 Reverse orientation
 .TP
+.B "--border"
+Draw border above and below the finder
+.TP
 .BI "--margin=" MARGIN
 Comma-separated expression for margins around the finder.
 .br
diff --git a/src/options.go b/src/options.go
index 3fadb4eb..30cc7519 100644
--- a/src/options.go
+++ b/src/options.go
@@ -54,6 +54,7 @@ const usage = `usage: fzf [options]
     --min-height=HEIGHT   Minimum height when --height is given in percent
                           (default: 10)
     --reverse             Reverse orientation
+    --border              Draw border above and below the finder
     --margin=MARGIN       Screen margin (TRBL / TB,RL / T,RL,B / T,R,B,L)
     --inline-info         Display finder info inline with the query
     --prompt=STR          Input prompt (default: '> ')
@@ -183,6 +184,7 @@ type Options struct {
 	Header      []string
 	HeaderLines int
 	Margin      [4]sizeSpec
+	Bordered    bool
 	Tabstop     int
 	Version     bool
 }
@@ -1086,6 +1088,10 @@ func parseOptions(opts *Options, allArgs []string) {
 			opts.Height = sizeSpec{}
 		case "--no-margin":
 			opts.Margin = defaultMargin()
+		case "--no-border":
+			opts.Bordered = false
+		case "--border":
+			opts.Bordered = true
 		case "--margin":
 			opts.Margin = parseMargin(
 				nextString(allArgs, &i, "margin required (TRBL / TB,RL / T,RL,B / T,R,B,L)"))
diff --git a/src/terminal.go b/src/terminal.go
index 134462ec..5853022a 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -83,8 +83,10 @@ type Terminal struct {
 	tabstop    int
 	margin     [4]sizeSpec
 	strong     tui.Attr
+	bordered   bool
+	border     tui.Window
 	window     tui.Window
-	bwindow    tui.Window
+	pborder    tui.Window
 	pwindow    tui.Window
 	count      int
 	progress   int
@@ -295,15 +297,22 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		maxHeightFunc := func(termHeight int) int {
 			var maxHeight int
 			if opts.Height.percent {
-				maxHeight = util.Min(termHeight,
-					util.Max(int(opts.Height.size*float64(termHeight)/100.0), opts.MinHeight))
+				maxHeight = util.Max(int(opts.Height.size*float64(termHeight)/100.0), opts.MinHeight)
 			} else {
-				maxHeight = util.Min(termHeight, int(opts.Height.size))
+				maxHeight = int(opts.Height.size)
+			}
+
+			effectiveMinHeight := minHeight
+			if previewBox != nil && (opts.Preview.position == posUp || opts.Preview.position == posDown) {
+				effectiveMinHeight *= 2
 			}
 			if opts.InlineInfo {
-				return util.Max(maxHeight, minHeight-1)
+				effectiveMinHeight -= 1
+			}
+			if opts.Bordered {
+				effectiveMinHeight += 2
 			}
-			return util.Max(maxHeight, minHeight)
+			return util.Min(termHeight, util.Max(maxHeight, effectiveMinHeight))
 		}
 		renderer = tui.NewLightRenderer(opts.Theme, opts.Black, opts.Mouse, opts.Tabstop, maxHeightFunc)
 	} else if tui.HasFullscreenRenderer() {
@@ -343,6 +352,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		printQuery: opts.PrintQuery,
 		history:    opts.History,
 		margin:     opts.Margin,
+		bordered:   opts.Bordered,
 		strong:     strongAttr,
 		cycle:      opts.Cycle,
 		header:     header,
@@ -499,6 +509,9 @@ func (t *Terminal) resizeWindows() {
 		} else {
 			marginInt[idx] = int(sizeSpec.size)
 		}
+		if t.bordered && idx%2 == 0 {
+			marginInt[idx] += 1
+		}
 	}
 	adjust := func(idx1 int, idx2 int, max int, min int) {
 		if max >= min {
@@ -524,19 +537,29 @@ func (t *Terminal) resizeWindows() {
 	}
 	adjust(1, 3, screenWidth, minAreaWidth)
 	adjust(0, 2, screenHeight, minAreaHeight)
+	if t.border != nil {
+		t.border.Close()
+	}
 	if t.window != nil {
 		t.window.Close()
 	}
-	if t.bwindow != nil {
-		t.bwindow.Close()
+	if t.pborder != nil {
+		t.pborder.Close()
 		t.pwindow.Close()
 	}
 
 	width := screenWidth - marginInt[1] - marginInt[3]
 	height := screenHeight - marginInt[0] - marginInt[2]
+	if t.bordered {
+		t.border = t.tui.NewWindow(
+			marginInt[0]-1,
+			marginInt[3],
+			width,
+			height+2, tui.BorderHorizontal)
+	}
 	if previewVisible {
 		createPreviewWindow := func(y int, x int, w int, h int) {
-			t.bwindow = t.tui.NewWindow(y, x, w, h, true)
+			t.pborder = t.tui.NewWindow(y, x, w, h, tui.BorderAround)
 			pwidth := w - 4
 			// ncurses auto-wraps the line when the cursor reaches the right-end of
 			// the window. To prevent unintended line-wraps, we use the width one
@@ -544,28 +567,28 @@ func (t *Terminal) resizeWindows() {
 			if !t.preview.wrap && t.tui.DoesAutoWrap() {
 				pwidth += 1
 			}
-			t.pwindow = t.tui.NewWindow(y+1, x+2, pwidth, h-2, false)
+			t.pwindow = t.tui.NewWindow(y+1, x+2, pwidth, h-2, tui.BorderNone)
 		}
 		switch t.preview.position {
 		case posUp:
 			pheight := calculateSize(height, t.preview.size, minHeight, 3)
 			t.window = t.tui.NewWindow(
-				marginInt[0]+pheight, marginInt[3], width, height-pheight, false)
+				marginInt[0]+pheight, marginInt[3], width, height-pheight, tui.BorderNone)
 			createPreviewWindow(marginInt[0], marginInt[3], width, pheight)
 		case posDown:
 			pheight := calculateSize(height, t.preview.size, minHeight, 3)
 			t.window = t.tui.NewWindow(
-				marginInt[0], marginInt[3], width, height-pheight, false)
+				marginInt[0], marginInt[3], width, height-pheight, tui.BorderNone)
 			createPreviewWindow(marginInt[0]+height-pheight, marginInt[3], width, pheight)
 		case posLeft:
 			pwidth := calculateSize(width, t.preview.size, minWidth, 5)
 			t.window = t.tui.NewWindow(
-				marginInt[0], marginInt[3]+pwidth, width-pwidth, height, false)
+				marginInt[0], marginInt[3]+pwidth, width-pwidth, height, tui.BorderNone)
 			createPreviewWindow(marginInt[0], marginInt[3], pwidth, height)
 		case posRight:
 			pwidth := calculateSize(width, t.preview.size, minWidth, 5)
 			t.window = t.tui.NewWindow(
-				marginInt[0], marginInt[3], width-pwidth, height, false)
+				marginInt[0], marginInt[3], width-pwidth, height, tui.BorderNone)
 			createPreviewWindow(marginInt[0], marginInt[3]+width-pwidth, pwidth, height)
 		}
 	} else {
@@ -573,7 +596,7 @@ func (t *Terminal) resizeWindows() {
 			marginInt[0],
 			marginInt[3],
 			width,
-			height, false)
+			height, tui.BorderNone)
 	}
 	if !t.tui.IsOptimized() && t.theme != nil && t.theme.HasBg() {
 		for i := 0; i < t.window.Height(); i++ {
@@ -978,11 +1001,15 @@ func (t *Terminal) printAll() {
 
 func (t *Terminal) refresh() {
 	if !t.suppress {
+		windows := make([]tui.Window, 0, 4)
+		if t.bordered {
+			windows = append(windows, t.border)
+		}
 		if t.hasPreviewWindow() {
-			t.tui.RefreshWindows([]tui.Window{t.bwindow, t.pwindow, t.window})
-		} else {
-			t.tui.RefreshWindows([]tui.Window{t.window})
+			windows = append(windows, t.pborder, t.pwindow)
 		}
+		windows = append(windows, t.window)
+		t.tui.RefreshWindows(windows)
 	}
 }
 
diff --git a/src/tui/dummy.go b/src/tui/dummy.go
index 01179c89..60a23fb6 100644
--- a/src/tui/dummy.go
+++ b/src/tui/dummy.go
@@ -40,6 +40,6 @@ func (r *FullscreenRenderer) MaxY() int          { return 0 }
 
 func (r *FullscreenRenderer) RefreshWindows(windows []Window) {}
 
-func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, border bool) Window {
+func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, borderStyle BorderStyle) Window {
 	return nil
 }
diff --git a/src/tui/light.go b/src/tui/light.go
index 2ce0d5ff..9465c49a 100644
--- a/src/tui/light.go
+++ b/src/tui/light.go
@@ -95,7 +95,7 @@ type LightRenderer struct {
 type LightWindow struct {
 	renderer *LightRenderer
 	colored  bool
-	border   bool
+	border   BorderStyle
 	top      int
 	left     int
 	width    int
@@ -600,11 +600,11 @@ func (r *LightRenderer) IsOptimized() bool {
 	return false
 }
 
-func (r *LightRenderer) NewWindow(top int, left int, width int, height int, border bool) Window {
+func (r *LightRenderer) NewWindow(top int, left int, width int, height int, borderStyle BorderStyle) Window {
 	w := &LightWindow{
 		renderer: r,
 		colored:  r.theme != nil,
-		border:   border,
+		border:   borderStyle,
 		top:      top,
 		left:     left,
 		width:    width,
@@ -614,13 +614,27 @@ func (r *LightRenderer) NewWindow(top int, left int, width int, height int, bord
 	if r.theme != nil {
 		w.bg = r.theme.Bg
 	}
-	if w.border {
-		w.drawBorder()
-	}
+	w.drawBorder()
 	return w
 }
 
 func (w *LightWindow) drawBorder() {
+	switch w.border {
+	case BorderAround:
+		w.drawBorderAround()
+	case BorderHorizontal:
+		w.drawBorderHorizontal()
+	}
+}
+
+func (w *LightWindow) drawBorderHorizontal() {
+	w.Move(0, 0)
+	w.CPrint(ColBorder, AttrRegular, repeat("─", w.width))
+	w.Move(w.height-1, 0)
+	w.CPrint(ColBorder, AttrRegular, repeat("─", w.width))
+}
+
+func (w *LightWindow) drawBorderAround() {
 	w.Move(0, 0)
 	w.CPrint(ColBorder, AttrRegular, "┌"+repeat("─", w.width-2)+"┐")
 	for y := 1; y < w.height-1; y++ {
@@ -854,9 +868,7 @@ func (w *LightWindow) FinishFill() {
 }
 
 func (w *LightWindow) Erase() {
-	if w.border {
-		w.drawBorder()
-	}
+	w.drawBorder()
 	// We don't erase the window here to avoid flickering during scroll
 	w.Move(0, 0)
 }
diff --git a/src/tui/ncurses.go b/src/tui/ncurses.go
index 978b2e72..4b88b447 100644
--- a/src/tui/ncurses.go
+++ b/src/tui/ncurses.go
@@ -189,12 +189,13 @@ func (r *FullscreenRenderer) Close() {
 	C.delscreen(_screen)
 }
 
-func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, border bool) Window {
+func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, borderStyle BorderStyle) Window {
 	win := C.newwin(C.int(height), C.int(width), C.int(top), C.int(left))
 	if r.theme != nil {
 		C.wbkgd(win, C.chtype(C.COLOR_PAIR(C.int(ColNormal.index()))))
 	}
-	if border {
+	// FIXME Does not implement BorderHorizontal
+	if borderStyle != BorderNone {
 		pair, attr := _colorFn(ColBorder, 0)
 		C.wcolor_set(win, pair, nil)
 		C.wattron(win, attr)
diff --git a/src/tui/tcell.go b/src/tui/tcell.go
index aa67ae1a..964c19e1 100644
--- a/src/tui/tcell.go
+++ b/src/tui/tcell.go
@@ -27,15 +27,15 @@ func (p ColorPair) style() tcell.Style {
 type Attr tcell.Style
 
 type TcellWindow struct {
-	color      bool
-	top        int
-	left       int
-	width      int
-	height     int
-	lastX      int
-	lastY      int
-	moveCursor bool
-	border     bool
+	color       bool
+	top         int
+	left        int
+	width       int
+	height      int
+	lastX       int
+	lastY       int
+	moveCursor  bool
+	borderStyle BorderStyle
 }
 
 func (w *TcellWindow) Top() int {
@@ -61,8 +61,11 @@ func (w *TcellWindow) Refresh() {
 	}
 	w.lastX = 0
 	w.lastY = 0
-	if w.border {
-		w.drawBorder()
+	switch w.borderStyle {
+	case BorderAround:
+		w.drawBorder(true)
+	case BorderHorizontal:
+		w.drawBorder(false)
 	}
 }
 
@@ -377,15 +380,15 @@ func (r *FullscreenRenderer) RefreshWindows(windows []Window) {
 	_screen.Show()
 }
 
-func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, border bool) Window {
+func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, borderStyle BorderStyle) Window {
 	// TODO
 	return &TcellWindow{
-		color:  r.theme != nil,
-		top:    top,
-		left:   left,
-		width:  width,
-		height: height,
-		border: border}
+		color:       r.theme != nil,
+		top:         top,
+		left:        left,
+		width:       width,
+		height:      height,
+		borderStyle: borderStyle}
 }
 
 func (w *TcellWindow) Close() {
@@ -536,7 +539,7 @@ func (w *TcellWindow) CFill(fg Color, bg Color, a Attr, str string) FillReturn {
 	return w.fillString(str, ColorPair{fg, bg, -1}, a)
 }
 
-func (w *TcellWindow) drawBorder() {
+func (w *TcellWindow) drawBorder(around bool) {
 	left := w.left
 	right := left + w.width
 	top := w.top
@@ -554,13 +557,15 @@ func (w *TcellWindow) drawBorder() {
 		_screen.SetContent(x, bot-1, tcell.RuneHLine, nil, style)
 	}
 
-	for y := top; y < bot; y++ {
-		_screen.SetContent(left, y, tcell.RuneVLine, nil, style)
-		_screen.SetContent(right-1, y, tcell.RuneVLine, nil, style)
-	}
+	if around {
+		for y := top; y < bot; y++ {
+			_screen.SetContent(left, y, tcell.RuneVLine, nil, style)
+			_screen.SetContent(right-1, y, tcell.RuneVLine, nil, style)
+		}
 
-	_screen.SetContent(left, top, tcell.RuneULCorner, nil, style)
-	_screen.SetContent(right-1, top, tcell.RuneURCorner, nil, style)
-	_screen.SetContent(left, bot-1, tcell.RuneLLCorner, nil, style)
-	_screen.SetContent(right-1, bot-1, tcell.RuneLRCorner, nil, style)
+		_screen.SetContent(left, top, tcell.RuneULCorner, nil, style)
+		_screen.SetContent(right-1, top, tcell.RuneURCorner, nil, style)
+		_screen.SetContent(left, bot-1, tcell.RuneLLCorner, nil, style)
+		_screen.SetContent(right-1, bot-1, tcell.RuneLRCorner, nil, style)
+	}
 }
diff --git a/src/tui/tui.go b/src/tui/tui.go
index 2508aa68..f8d905ab 100644
--- a/src/tui/tui.go
+++ b/src/tui/tui.go
@@ -195,6 +195,14 @@ type MouseEvent struct {
 	Mod    bool
 }
 
+type BorderStyle int
+
+const (
+	BorderNone BorderStyle = iota
+	BorderAround
+	BorderHorizontal
+)
+
 type Renderer interface {
 	Init()
 	Pause()
@@ -211,7 +219,7 @@ type Renderer interface {
 	DoesAutoWrap() bool
 	IsOptimized() bool
 
-	NewWindow(top int, left int, width int, height int, border bool) Window
+	NewWindow(top int, left int, width int, height int, borderStyle BorderStyle) Window
 }
 
 type Window interface {