Add more --border options; default changed to "rounded"

--border option now takes an optional argument that defines the style

  - rounded (new default)
  - sharp
  - horizontal (previous default)

6 files changed, 150 insertions, 90 deletions

diff --git a/man/man1/fzf.1 b/man/man1/fzf.1
index 0486b033..d9186517 100644
--- a/man/man1/fzf.1
+++ b/man/man1/fzf.1
@@ -21,7 +21,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ..
-.TH fzf 1 "Feb 2020" "fzf 0.21.0" "fzf - a command-line fuzzy finder"
+.TH fzf 1 "Mar 2020" "fzf 0.21.0" "fzf - a command-line fuzzy finder"
 
 .SH NAME
 fzf - a command-line fuzzy finder
@@ -178,8 +178,16 @@ Choose the layout (default: default)
 A synonym for \fB--layout=reverse\fB
 
 .TP
-.B "--border"
-Draw border above and below the finder
+.BI "--border" [=STYLE]
+Draw border around the finder
+
+.br
+.BR rounded "     Border with rounded corners (default)"
+.br
+.BR sharp "       Border with sharp corners"
+.br
+.BR horizontal "  Horizontal lines above and below the finder"
+.br
 
 .TP
 .B "--no-unicode"
diff --git a/src/options.go b/src/options.go
index 69ff7d4c..b87e85c2 100644
--- a/src/options.go
+++ b/src/options.go
@@ -57,7 +57,8 @@ const usage = `usage: fzf [options]
     --min-height=HEIGHT   Minimum height when --height is given in percent
                           (default: 10)
     --layout=LAYOUT       Choose layout: [default|reverse|reverse-list]
-    --border              Draw border above and below the finder
+    --border[=STYLE]      Draw border around the finder
+                          [rounded|sharp|horizontal] (default: rounded)
     --margin=MARGIN       Screen margin (TRBL / TB,RL / T,RL,B / T,R,B,L)
     --info=STYLE          Finder info style [default|inline|hidden]
     --prompt=STR          Input prompt (default: '> ')
@@ -212,7 +213,7 @@ type Options struct {
 	Header      []string
 	HeaderLines int
 	Margin      [4]sizeSpec
-	Bordered    bool
+	BorderShape tui.BorderShape
 	Unicode     bool
 	Tabstop     int
 	ClearOnExit bool
@@ -301,12 +302,12 @@ func nextString(args []string, i *int, message string) string {
 	return args[*i]
 }
 
-func optionalNextString(args []string, i *int) string {
-	if len(args) > *i+1 && !strings.HasPrefix(args[*i+1], "-") {
+func optionalNextString(args []string, i *int) (bool, string) {
+	if len(args) > *i+1 && !strings.HasPrefix(args[*i+1], "-") && !strings.HasPrefix(args[*i+1], "+") {
 		*i++
-		return args[*i]
+		return true, args[*i]
 	}
-	return ""
+	return false, ""
 }
 
 func atoi(str string) int {
@@ -400,6 +401,23 @@ func parseAlgo(str string) algo.Algo {
 	return algo.FuzzyMatchV2
 }
 
+func parseBorder(str string, optional bool) tui.BorderShape {
+	switch str {
+	case "rounded":
+		return tui.BorderRounded
+	case "sharp":
+		return tui.BorderSharp
+	case "horizontal":
+		return tui.BorderHorizontal
+	default:
+		if optional && str == "" {
+			return tui.BorderRounded
+		}
+		errorExit("invalid border style (expected: rounded|sharp|horizontal)")
+	}
+	return tui.BorderNone
+}
+
 func parseKeyChords(str string, message string) map[int]string {
 	if len(str) == 0 {
 		errorExit(message)
@@ -1098,7 +1116,7 @@ func parseOptions(opts *Options, allArgs []string) {
 		case "--bind":
 			parseKeymap(opts.Keymap, nextString(allArgs, &i, "bind expression required"))
 		case "--color":
-			spec := optionalNextString(allArgs, &i)
+			_, spec := optionalNextString(allArgs, &i)
 			if len(spec) == 0 {
 				opts.Theme = tui.EmptyTheme()
 			} else {
@@ -1246,9 +1264,10 @@ func parseOptions(opts *Options, allArgs []string) {
 		case "--no-margin":
 			opts.Margin = defaultMargin()
 		case "--no-border":
-			opts.Bordered = false
+			opts.BorderShape = tui.BorderNone
 		case "--border":
-			opts.Bordered = true
+			hasArg, arg := optionalNextString(allArgs, &i)
+			opts.BorderShape = parseBorder(arg, !hasArg)
 		case "--no-unicode":
 			opts.Unicode = false
 		case "--unicode":
@@ -1273,6 +1292,8 @@ func parseOptions(opts *Options, allArgs []string) {
 				opts.Filter = &value
 			} else if match, value := optString(arg, "-d", "--delimiter="); match {
 				opts.Delimiter = delimiterRegexp(value)
+			} else if match, value := optString(arg, "--border="); match {
+				opts.BorderShape = parseBorder(value, false)
 			} else if match, value := optString(arg, "--prompt="); match {
 				opts.Prompt = value
 			} else if match, value := optString(arg, "--pointer="); match {
diff --git a/src/terminal.go b/src/terminal.go
index bd41bdb8..a6a5c5ba 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -100,7 +100,7 @@ type Terminal struct {
 	margin       [4]sizeSpec
 	strong       tui.Attr
 	unicode      bool
-	bordered     bool
+	borderShape  tui.BorderShape
 	cleanExit    bool
 	border       tui.Window
 	window       tui.Window
@@ -370,9 +370,9 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 				effectiveMinHeight *= 2
 			}
 			if opts.InfoStyle != infoDefault {
-				effectiveMinHeight -= 1
+				effectiveMinHeight--
 			}
-			if opts.Bordered {
+			if opts.BorderShape != tui.BorderNone {
 				effectiveMinHeight += 2
 			}
 			return util.Min(termHeight, util.Max(maxHeight, effectiveMinHeight))
@@ -391,62 +391,62 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		spinner = []string{`-`, `\`, `|`, `/`, `-`, `\`, `|`, `/`}
 	}
 	t := Terminal{
-		initDelay:  delay,
-		infoStyle:  opts.InfoStyle,
-		spinner:    spinner,
-		queryLen:   [2]int{0, 0},
-		layout:     opts.Layout,
-		fullscreen: fullscreen,
-		hscroll:    opts.Hscroll,
-		hscrollOff: opts.HscrollOff,
-		wordRubout: wordRubout,
-		wordNext:   wordNext,
-		cx:         len(input),
-		cy:         0,
-		offset:     0,
-		xoffset:    0,
-		yanked:     []rune{},
-		input:      input,
-		multi:      opts.Multi,
-		sort:       opts.Sort > 0,
-		toggleSort: opts.ToggleSort,
-		delimiter:  opts.Delimiter,
-		expect:     opts.Expect,
-		keymap:     opts.Keymap,
-		pressed:    "",
-		printQuery: opts.PrintQuery,
-		history:    opts.History,
-		margin:     opts.Margin,
-		unicode:    opts.Unicode,
-		bordered:   opts.Bordered,
-		cleanExit:  opts.ClearOnExit,
-		strong:     strongAttr,
-		cycle:      opts.Cycle,
-		header:     header,
-		header0:    header,
-		ansi:       opts.Ansi,
-		tabstop:    opts.Tabstop,
-		reading:    true,
-		failed:     nil,
-		jumping:    jumpDisabled,
-		jumpLabels: opts.JumpLabels,
-		printer:    opts.Printer,
-		printsep:   opts.PrintSep,
-		merger:     EmptyMerger,
-		selected:   make(map[int32]selectedItem),
-		reqBox:     util.NewEventBox(),
-		preview:    opts.Preview,
-		previewer:  previewer{"", 0, 0, previewBox != nil && !opts.Preview.hidden, false},
-		previewBox: previewBox,
-		eventBox:   eventBox,
-		mutex:      sync.Mutex{},
-		suppress:   true,
-		slab:       util.MakeSlab(slab16Size, slab32Size),
-		theme:      opts.Theme,
-		startChan:  make(chan bool, 1),
-		killChan:   make(chan int),
-		tui:        renderer,
-		initFunc:   func() { renderer.Init() }}
+		initDelay:   delay,
+		infoStyle:   opts.InfoStyle,
+		spinner:     spinner,
+		queryLen:    [2]int{0, 0},
+		layout:      opts.Layout,
+		fullscreen:  fullscreen,
+		hscroll:     opts.Hscroll,
+		hscrollOff:  opts.HscrollOff,
+		wordRubout:  wordRubout,
+		wordNext:    wordNext,
+		cx:          len(input),
+		cy:          0,
+		offset:      0,
+		xoffset:     0,
+		yanked:      []rune{},
+		input:       input,
+		multi:       opts.Multi,
+		sort:        opts.Sort > 0,
+		toggleSort:  opts.ToggleSort,
+		delimiter:   opts.Delimiter,
+		expect:      opts.Expect,
+		keymap:      opts.Keymap,
+		pressed:     "",
+		printQuery:  opts.PrintQuery,
+		history:     opts.History,
+		margin:      opts.Margin,
+		unicode:     opts.Unicode,
+		borderShape: opts.BorderShape,
+		cleanExit:   opts.ClearOnExit,
+		strong:      strongAttr,
+		cycle:       opts.Cycle,
+		header:      header,
+		header0:     header,
+		ansi:        opts.Ansi,
+		tabstop:     opts.Tabstop,
+		reading:     true,
+		failed:      nil,
+		jumping:     jumpDisabled,
+		jumpLabels:  opts.JumpLabels,
+		printer:     opts.Printer,
+		printsep:    opts.PrintSep,
+		merger:      EmptyMerger,
+		selected:    make(map[int32]selectedItem),
+		reqBox:      util.NewEventBox(),
+		preview:     opts.Preview,
+		previewer:   previewer{"", 0, 0, previewBox != nil && !opts.Preview.hidden, false},
+		previewBox:  previewBox,
+		eventBox:    eventBox,
+		mutex:       sync.Mutex{},
+		suppress:    true,
+		slab:        util.MakeSlab(slab16Size, slab32Size),
+		theme:       opts.Theme,
+		startChan:   make(chan bool, 1),
+		killChan:    make(chan int),
+		tui:         renderer,
+		initFunc:    func() { renderer.Init() }}
 	t.prompt, t.promptLen = t.processTabs([]rune(opts.Prompt), 0)
 	t.pointer, t.pointerLen = t.processTabs([]rune(opts.Pointer), 0)
 	t.marker, t.markerLen = t.processTabs([]rune(opts.Marker), 0)
@@ -595,8 +595,11 @@ func (t *Terminal) resizeWindows() {
 		} else {
 			marginInt[idx] = int(sizeSpec.size)
 		}
-		if t.bordered && idx%2 == 0 {
-			marginInt[idx] += 1
+		switch t.borderShape {
+		case tui.BorderHorizontal:
+			marginInt[idx] += 1 - idx%2
+		case tui.BorderRounded, tui.BorderSharp:
+			marginInt[idx] += 1 + idx%2
 		}
 	}
 	adjust := func(idx1 int, idx2 int, max int, min int) {
@@ -636,18 +639,26 @@ func (t *Terminal) resizeWindows() {
 
 	width := screenWidth - marginInt[1] - marginInt[3]
 	height := screenHeight - marginInt[0] - marginInt[2]
-	if t.bordered {
+	switch t.borderShape {
+	case tui.BorderHorizontal:
 		t.border = t.tui.NewWindow(
 			marginInt[0]-1,
 			marginInt[3],
 			width,
 			height+2,
 			false, tui.MakeBorderStyle(tui.BorderHorizontal, t.unicode))
+	case tui.BorderRounded, tui.BorderSharp:
+		t.border = t.tui.NewWindow(
+			marginInt[0]-1,
+			marginInt[3]-2,
+			width+4,
+			height+2,
+			false, tui.MakeBorderStyle(t.borderShape, t.unicode))
 	}
 	noBorder := tui.MakeBorderStyle(tui.BorderNone, t.unicode)
 	if previewVisible {
 		createPreviewWindow := func(y int, x int, w int, h int) {
-			previewBorder := tui.MakeBorderStyle(tui.BorderAround, t.unicode)
+			previewBorder := tui.MakeBorderStyle(tui.BorderRounded, t.unicode)
 			if !t.preview.border {
 				previewBorder = tui.MakeTransparentBorder()
 			}
@@ -1146,7 +1157,7 @@ func (t *Terminal) refresh() {
 	t.placeCursor()
 	if !t.suppress {
 		windows := make([]tui.Window, 0, 4)
-		if t.bordered {
+		if t.borderShape != tui.BorderNone {
 			windows = append(windows, t.border)
 		}
 		if t.hasPreviewWindow() {
diff --git a/src/tui/light.go b/src/tui/light.go
index 05f87e6f..fbc76f59 100644
--- a/src/tui/light.go
+++ b/src/tui/light.go
@@ -105,6 +105,7 @@ type LightRenderer struct {
 type LightWindow struct {
 	renderer *LightRenderer
 	colored  bool
+	preview  bool
 	border   BorderStyle
 	top      int
 	left     int
@@ -681,6 +682,7 @@ func (r *LightRenderer) NewWindow(top int, left int, width int, height int, prev
 	w := &LightWindow{
 		renderer: r,
 		colored:  r.theme != nil,
+		preview:  preview,
 		border:   borderStyle,
 		top:      top,
 		left:     left,
@@ -704,7 +706,7 @@ func (r *LightRenderer) NewWindow(top int, left int, width int, height int, prev
 
 func (w *LightWindow) drawBorder() {
 	switch w.border.shape {
-	case BorderAround:
+	case BorderRounded, BorderSharp:
 		w.drawBorderAround()
 	case BorderHorizontal:
 		w.drawBorderHorizontal()
@@ -720,16 +722,20 @@ func (w *LightWindow) drawBorderHorizontal() {
 
 func (w *LightWindow) drawBorderAround() {
 	w.Move(0, 0)
-	w.CPrint(ColPreviewBorder, AttrRegular,
+	color := ColBorder
+	if w.preview {
+		color = ColPreviewBorder
+	}
+	w.CPrint(color, AttrRegular,
 		string(w.border.topLeft)+repeat(w.border.horizontal, w.width-2)+string(w.border.topRight))
 	for y := 1; y < w.height-1; y++ {
 		w.Move(y, 0)
-		w.CPrint(ColPreviewBorder, AttrRegular, string(w.border.vertical))
-		w.CPrint(ColPreviewBorder, AttrRegular, repeat(' ', w.width-2))
-		w.CPrint(ColPreviewBorder, AttrRegular, string(w.border.vertical))
+		w.CPrint(color, AttrRegular, string(w.border.vertical))
+		w.CPrint(color, AttrRegular, repeat(' ', w.width-2))
+		w.CPrint(color, AttrRegular, string(w.border.vertical))
 	}
 	w.Move(w.height-1, 0)
-	w.CPrint(ColPreviewBorder, AttrRegular,
+	w.CPrint(color, AttrRegular,
 		string(w.border.bottomLeft)+repeat(w.border.horizontal, w.width-2)+string(w.border.bottomRight))
 }
 
diff --git a/src/tui/tcell.go b/src/tui/tcell.go
index 79b4944e..db891655 100644
--- a/src/tui/tcell.go
+++ b/src/tui/tcell.go
@@ -28,6 +28,7 @@ type Attr tcell.Style
 
 type TcellWindow struct {
 	color       bool
+	preview     bool
 	top         int
 	left        int
 	width       int
@@ -418,6 +419,7 @@ func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int,
 	}
 	return &TcellWindow{
 		color:       r.theme != nil,
+		preview:     preview,
 		top:         top,
 		left:        left,
 		width:       width,
@@ -591,7 +593,7 @@ func (w *TcellWindow) drawBorder() {
 
 	var style tcell.Style
 	if w.color {
-		if w.borderStyle.shape == BorderAround {
+		if w.preview {
 			style = ColPreviewBorder.style()
 		} else {
 			style = ColBorder.style()
@@ -605,7 +607,7 @@ func (w *TcellWindow) drawBorder() {
 		_screen.SetContent(x, bot-1, w.borderStyle.horizontal, nil, style)
 	}
 
-	if w.borderStyle.shape == BorderAround {
+	if w.borderStyle.shape != BorderHorizontal {
 		for y := top; y < bot; y++ {
 			_screen.SetContent(left, y, w.borderStyle.vertical, nil, style)
 			_screen.SetContent(right-1, y, w.borderStyle.vertical, nil, style)
diff --git a/src/tui/tui.go b/src/tui/tui.go
index 179adfd5..4968b366 100644
--- a/src/tui/tui.go
+++ b/src/tui/tui.go
@@ -210,7 +210,8 @@ type BorderShape int
 
 const (
 	BorderNone BorderShape = iota
-	BorderAround
+	BorderRounded
+	BorderSharp
 	BorderHorizontal
 )
 
@@ -228,14 +229,25 @@ 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: '╯',
+			}
+		}
 		return BorderStyle{
 			shape:       shape,
 			horizontal:  '─',
 			vertical:    '│',
-			topLeft:     '╭',
-			topRight:    '╮',
-			bottomLeft:  '╰',
-			bottomRight: '╯',
+			topLeft:     '┌',
+			topRight:    '┐',
+			bottomLeft:  '└',
+			bottomRight: '┘',
 		}
 	}
 	return BorderStyle{
@@ -251,7 +263,7 @@ func MakeBorderStyle(shape BorderShape, unicode bool) BorderStyle {
 
 func MakeTransparentBorder() BorderStyle {
 	return BorderStyle{
-		shape:       BorderAround,
+		shape:       BorderRounded,
 		horizontal:  ' ',
 		vertical:    ' ',
 		topLeft:     ' ',