switch to tcell from termbox

This is a simple mostly straight forward switch to tcell in favor of
termbox.
It uses the tcell native api (not the compat layer) but does not make
use of most features.

Further changes should include moving to tcell's views.TextArea and the
general built in widget behaviour instead of the current ad hoc
implementation.

Regression: Cursor isn't shown in ex-line

3 files changed, 45 insertions, 58 deletions

diff --git a/widgets/aerc.go b/widgets/aerc.go
index 5563275..19ddfdd 100644
--- a/widgets/aerc.go
+++ b/widgets/aerc.go
@@ -5,7 +5,7 @@ import (
 	"log"
 	"time"
 
-	tb "github.com/nsf/termbox-go"
+	"github.com/gdamore/tcell"
 
 	libui "git.sr.ht/~sircmpwn/aerc2/lib/ui"
 )
@@ -35,7 +35,7 @@ func NewAerc(logger *log.Logger) *Aerc {
 	// TODO: move sidebar into tab content, probably
 	grid.AddChild(libui.NewText("aerc").
 		Strategy(libui.TEXT_CENTER).
-		Color(tb.ColorBlack, tb.ColorWhite))
+		Color(tcell.ColorBlack, tcell.ColorWhite))
 	// sidebar placeholder:
 	grid.AddChild(libui.NewBordered(
 		libui.NewFill('.'), libui.BORDER_RIGHT)).At(1, 0).Span(2, 1)
@@ -75,10 +75,10 @@ func (aerc *Aerc) Draw(ctx *libui.Context) {
 	aerc.grid.Draw(ctx)
 }
 
-func (aerc *Aerc) Event(event tb.Event) bool {
-	switch event.Type {
-	case tb.EventKey:
-		if event.Ch == ':' {
+func (aerc *Aerc) Event(event tcell.Event) bool {
+	switch event := event.(type) {
+	case *tcell.EventKey:
+		if event.Rune() == ':' {
 			exline := NewExLine(func(command string) {
 				aerc.statusline.Push(fmt.Sprintf("TODO: execute %s", command),
 					3 * time.Second)
@@ -92,12 +92,10 @@ func (aerc *Aerc) Event(event tb.Event) bool {
 			aerc.statusbar.Push(exline)
 			return true
 		}
-		fallthrough
-	default:
-		if aerc.interactive != nil {
-			return aerc.interactive.Event(event)
-		} else {
-			return false
-		}
+	}
+	if aerc.interactive != nil {
+		return aerc.interactive.Event(event)
+	} else {
+		return false
 	}
 }
diff --git a/widgets/exline.go b/widgets/exline.go
index 0522371..de652ba 100644
--- a/widgets/exline.go
+++ b/widgets/exline.go
@@ -2,7 +2,7 @@ package widgets
 
 import (
 	"github.com/mattn/go-runewidth"
-	tb "github.com/nsf/termbox-go"
+	"github.com/gdamore/tcell"
 
 	"git.sr.ht/~sircmpwn/aerc2/lib/ui"
 )
@@ -40,15 +40,10 @@ func (ex *ExLine) Invalidate() {
 }
 
 func (ex *ExLine) Draw(ctx *ui.Context) {
-	cell := tb.Cell{
-		Fg: tb.ColorDefault,
-		Bg: tb.ColorDefault,
-		Ch: ' ',
-	}
-	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell)
-	ctx.Printf(0, 0, cell, ":%s", string(ex.command))
+	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
+	ctx.Printf(0, 0, tcell.StyleDefault, ":%s", string(ex.command))
 	cells := runewidth.StringWidth(string(ex.command[:ex.index]))
-	tb.SetCursor(ctx.X()+cells+1, ctx.Y())
+	ctx.SetCursor(cells + 1, 0)
 }
 
 func (ex *ExLine) insert(ch rune) {
@@ -93,43 +88,41 @@ func (ex *ExLine) backspace() {
 	}
 }
 
-func (ex *ExLine) Event(event tb.Event) bool {
-	switch event.Type {
-	case tb.EventKey:
-		switch event.Key {
-		case tb.KeySpace:
-			ex.insert(' ')
-		case tb.KeyBackspace, tb.KeyBackspace2:
+func (ex *ExLine) Event(event tcell.Event) bool {
+	switch event := event.(type) {
+	case *tcell.EventKey:
+		switch event.Key() {
+		case tcell.KeyBackspace, tcell.KeyBackspace2:
 			ex.backspace()
-		case tb.KeyCtrlD, tb.KeyDelete:
+		case tcell.KeyCtrlD, tcell.KeyDelete:
 			ex.deleteChar()
-		case tb.KeyCtrlB, tb.KeyArrowLeft:
+		case tcell.KeyCtrlB, tcell.KeyLeft:
 			if ex.index > 0 {
 				ex.index--
 				ex.Invalidate()
 			}
-		case tb.KeyCtrlF, tb.KeyArrowRight:
+		case tcell.KeyCtrlF, tcell.KeyRight:
 			if ex.index < len(ex.command) {
 				ex.index++
 				ex.Invalidate()
 			}
-		case tb.KeyCtrlA, tb.KeyHome:
+		case tcell.KeyCtrlA, tcell.KeyHome:
 			ex.index = 0
 			ex.Invalidate()
-		case tb.KeyCtrlE, tb.KeyEnd:
+		case tcell.KeyCtrlE, tcell.KeyEnd:
 			ex.index = len(ex.command)
 			ex.Invalidate()
-		case tb.KeyCtrlW:
+		case tcell.KeyCtrlW:
 			ex.deleteWord()
-		case tb.KeyEnter:
-			tb.HideCursor()
+		case tcell.KeyEnter:
+			//ex.ctx.Screen().HideCursor()
 			ex.commit(string(ex.command))
-		case tb.KeyEsc, tb.KeyCtrlC:
-			tb.HideCursor()
+		case tcell.KeyEsc, tcell.KeyCtrlC:
+			//ex.ctx.Screen().HideCursor()
 			ex.cancel()
 		default:
-			if event.Ch != 0 {
-				ex.insert(event.Ch)
+			if event.Rune() != 0 {
+				ex.insert(event.Rune())
 			}
 		}
 	}
diff --git a/widgets/status.go b/widgets/status.go
index bb87d33..3b4dbcc 100644
--- a/widgets/status.go
+++ b/widgets/status.go
@@ -3,7 +3,7 @@ package widgets
 import (
 	"time"
 
-	tb "github.com/nsf/termbox-go"
+	"github.com/gdamore/tcell"
 
 	"git.sr.ht/~sircmpwn/aerc2/lib/ui"
 )
@@ -16,16 +16,16 @@ type StatusLine struct {
 }
 
 type StatusMessage struct {
-	bg      tb.Attribute
-	fg      tb.Attribute
+	bg      tcell.Color
+	fg      tcell.Color
 	message string
 }
 
 func NewStatusLine() *StatusLine {
 	return &StatusLine{
 		fallback: StatusMessage{
-			bg:      tb.ColorWhite,
-			fg:      tb.ColorBlack,
+			bg:      tcell.ColorWhite,
+			fg:      tcell.ColorBlack,
 			message: "Idle",
 		},
 	}
@@ -46,19 +46,15 @@ func (status *StatusLine) Draw(ctx *ui.Context) {
 	if len(status.stack) != 0 {
 		line = status.stack[len(status.stack)-1]
 	}
-	cell := tb.Cell{
-		Fg: line.fg,
-		Bg: line.bg,
-		Ch: ' ',
-	}
-	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell)
-	ctx.Printf(0, 0, cell, "%s", line.message)
+	style := tcell.StyleDefault.Background(line.bg).Foreground(line.fg)
+	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style)
+	ctx.Printf(0, 0, style, "%s", line.message)
 }
 
 func (status *StatusLine) Set(text string) *StatusMessage {
 	status.fallback = StatusMessage{
-		bg:      tb.ColorWhite,
-		fg:      tb.ColorBlack,
+		bg:      tcell.ColorWhite,
+		fg:      tcell.ColorBlack,
 		message: text,
 	}
 	status.Invalidate()
@@ -67,8 +63,8 @@ func (status *StatusLine) Set(text string) *StatusMessage {
 
 func (status *StatusLine) Push(text string, expiry time.Duration) *StatusMessage {
 	msg := &StatusMessage{
-		bg:      tb.ColorWhite,
-		fg:      tb.ColorBlack,
+		bg:      tcell.ColorWhite,
+		fg:      tcell.ColorBlack,
 		message: text,
 	}
 	status.stack = append(status.stack, msg)
@@ -85,7 +81,7 @@ func (status *StatusLine) Push(text string, expiry time.Duration) *StatusMessage
 	return msg
 }
 
-func (msg *StatusMessage) Color(bg tb.Attribute, fg tb.Attribute) {
+func (msg *StatusMessage) Color(bg tcell.Color, fg tcell.Color) {
 	msg.bg = bg
 	msg.fg = fg
 }