add font modifier cell options: bold, italic, underline.

cell/cell.go

@@ -25,6 +25,10 @@ type Option interface {
 type Options struct {
 	FgColor       Color
 	BgColor       Color
+	Bold          bool
+	Italic        bool
+	Underline     bool
+	Strikethrough bool
 }
 
 // Set allows existing options to be passed as an option.
@@ -62,3 +66,31 @@ func BgColor(color Color) Option {
 		co.BgColor = color
 	})
 }
+
+// Bold makes cell's text bold.
+func Bold() Option {
+	return option(func(co *Options) {
+		co.Bold = true
+	})
+}
+
+// Italic makes cell's text italic. Only works when using the tcell backend.
+func Italic() Option {
+	return option(func(co *Options) {
+		co.Italic = true
+	})
+}
+
+// Underline makes cell's text underlined.
+func Underline() Option {
+	return option(func(co *Options) {
+		co.Underline = true
+	})
+}
+
+// Strikethrough strikes through the cell's text. Currently a no-op until tcell is updated to >= v2.0.0
+func Strikethrough() Option {
+	return option(func(co *Options) {
+		co.Strikethrough = true
+	})
+}

go.mod

@@ -3,7 +3,7 @@ module github.com/mum4k/termdash
 go 1.14
 
 require (
-	github.com/gdamore/tcell v1.3.0
+	github.com/gdamore/tcell v1.4.0
 	github.com/kylelemons/godebug v1.1.0
 	github.com/mattn/go-runewidth v0.0.9
 	github.com/nsf/termbox-go v0.0.0-20200204031403-4d2b513ad8be

go.sum

@@ -4,11 +4,16 @@ github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdk
 github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
 github.com/gdamore/tcell v1.3.0 h1:r35w0JBADPZCVQijYebl6YMWWtHRqVEGt7kL2eBADRM=
 github.com/gdamore/tcell v1.3.0/go.mod h1:Hjvr+Ofd+gLglo7RYKxxnzCBmev3BzsS67MebKS4zMM=
+github.com/gdamore/tcell v1.4.0 h1:vUnHwJRvcPQa3tzi+0QI4U9JINXYJlOz9yiaiPQ2wMU=
+github.com/gdamore/tcell v1.4.0/go.mod h1:vxEiSDZdW3L+Uhjii9c3375IlDmR05bzxY404ZVSMo0=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/lucasb-eyer/go-colorful v1.0.2 h1:mCMFu6PgSozg9tDNMMK3g18oJBX7oYGrC09mS6CXfO4=
 github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
+github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
+github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/nsf/termbox-go v0.0.0-20200204031403-4d2b513ad8be h1:yzmWtPyxEUIKdZg4RcPq64MfS8NA6A5fNOJgYhpR9EQ=

terminal/tcell/cell_options.go

@@ -57,6 +57,7 @@ func cellOptsToStyle(opts *cell.Options, colorMode terminalapi.ColorMode) tcell.
 	fg = fixColor(fg, colorMode)
 	bg = fixColor(bg, colorMode)
 
-	st = st.Foreground(fg).Background(bg)
+	// FIXME: tcell doesn't have a strikethrough style option
+	st = st.Foreground(fg).Background(bg).Bold(opts.Bold).Italic(opts.Italic).Underline(opts.Underline)
 	return st
 }

terminal/termbox/cell_options.go

@@ -28,7 +28,16 @@ func cellColor(c cell.Color) tbx.Attribute {
 
 // cellOptsToFg converts the cell options to the termbox foreground attribute.
 func cellOptsToFg(opts *cell.Options) tbx.Attribute {
-	return cellColor(opts.FgColor)
+	a := cellColor(opts.FgColor)
+	if opts.Bold {
+		a |= tbx.AttrBold
+	}
+	// FIXME: Termbox doesn't have an italics attribute
+	if opts.Underline {
+		a |= tbx.AttrUnderline
+	}
+	// FIXME: Termbox doesn't have a strikethrough attribute
+	return a
 }
 
 // cellOptsToBg converts the cell options to the termbox background attribute.

widgets/text/textdemo/textdemo.go

@@ -22,11 +22,12 @@ import (
 	"math/rand"
 	"time"
 
+	"github.com/mum4k/termdash/terminal/tcell"
+
 	"github.com/mum4k/termdash"
 	"github.com/mum4k/termdash/cell"
 	"github.com/mum4k/termdash/container"
 	"github.com/mum4k/termdash/linestyle"
-	"github.com/mum4k/termdash/terminal/termbox"
 	"github.com/mum4k/termdash/terminal/terminalapi"
 	"github.com/mum4k/termdash/widgets/text"
 )
@@ -67,7 +68,7 @@ func writeLines(ctx context.Context, t *text.Text, delay time.Duration) {
 }
 
 func main() {
-	t, err := termbox.New()
+	t, err := tcell.New()
 	if err != nil {
 		panic(err)
 	}
@@ -108,6 +109,15 @@ func main() {
 	if err := wrapped.Write(" colors", text.WriteCellOpts(cell.FgColor(cell.ColorBlue))); err != nil {
 		panic(err)
 	}
+	if err := wrapped.Write(" and"); err != nil {
+		panic(err)
+	}
+	if err := wrapped.Write(" font ", text.WriteCellOpts(cell.Bold(), cell.Italic())); err != nil {
+		panic(err)
+	}
+	if err := wrapped.Write("modifiers", text.WriteCellOpts(cell.Underline(), cell.Italic())); err != nil {
+		panic(err)
+	}
 	if err := wrapped.Write(". Wraps long lines at rune boundaries if the WrapAtRunes() option is provided.\nSupports newline character to\ncreate\nnewlines\nmanually.\nTrims the content if it is too long.\n\n\n\nToo long."); err != nil {
 		panic(err)
 	}