Add italic text formatting flag

CHANGELOG

@@ -1,3 +1,6 @@
+v1.4.8 (WIP)
+- Add italic text formatting flag
+
 v1.4.7 (2020-06-09)
 - Add Box.SetBackgroundTransparent
 - Add List.SetSelectedAlwaysCentered

doc.go

@@ -126,6 +126,7 @@ terminal):
   l: blink
   b: bold
   d: dim
+  i: italic
   r: reverse (switch foreground and background color)
   u: underline
 

go.mod

@@ -3,10 +3,10 @@ module gitlab.com/tslocum/cview
 go 1.12
 
 require (
-	github.com/gdamore/tcell v1.3.0
+	github.com/gdamore/tcell v1.3.1-0.20200608133353-cb1e5d6fa606
 	github.com/lucasb-eyer/go-colorful v1.0.3
 	github.com/mattn/go-runewidth v0.0.9
 	github.com/rivo/uniseg v0.1.0
 	gitlab.com/tslocum/cbind v0.1.1
-	golang.org/x/sys v0.0.0-20200523222454-059865788121 // indirect
+	golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980 // indirect
 )

go.sum

@@ -4,12 +4,15 @@ 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 v1.3.1-0.20200608133353-cb1e5d6fa606 h1:Y00kKKKYVyn7InlCMRcnZbwcjHFIsgkjU0Bn1F5re4o=
+github.com/gdamore/tcell v1.3.1-0.20200608133353-cb1e5d6fa606/go.mod h1:vxEiSDZdW3L+Uhjii9c3375IlDmR05bzxY404ZVSMo0=
 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 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 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 v0.0.8/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=
@@ -20,8 +23,8 @@ gitlab.com/tslocum/cbind v0.1.1/go.mod h1:rX7vkl0pUSg/yy427MmD1FZAf99S7WwpUlxF/q
 golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756 h1:9nuHUbU8dRnRRfj9KjWUVrJeoexdbeMjttk6Oh1rD10=
 golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200523222454-059865788121 h1:rITEj+UZHYC927n8GT97eC3zrpzXdb/voyeOuVKS46o=
-golang.org/x/sys v0.0.0-20200523222454-059865788121/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980 h1:OjiUf46hAmXblsZdnoSXsEUSKU8r1UEzcL5RVZ4gO9Y=
+golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=

util.go

@@ -20,7 +20,7 @@ const (
 
 // Common regular expressions.
 var (
-	colorPattern     = regexp.MustCompile(`\[([a-zA-Z]+|#[0-9a-zA-Z]{6}|\-)?(:([a-zA-Z]+|#[0-9a-zA-Z]{6}|\-)?(:([lbdru]+|\-)?)?)?\]`)
+	colorPattern     = regexp.MustCompile(`\[([a-zA-Z]+|#[0-9a-zA-Z]{6}|\-)?(:([a-zA-Z]+|#[0-9a-zA-Z]{6}|\-)?(:([lbdiru]+|\-)?)?)?\]`)
 	regionPattern    = regexp.MustCompile(`\["([a-zA-Z0-9_,;: \-\.]*)"\]`)
 	escapePattern    = regexp.MustCompile(`\[([a-zA-Z0-9_,;: \-\."#]+)\[(\[*)\]`)
 	nonEscapePattern = regexp.MustCompile(`(\[[a-zA-Z0-9_,;: \-\."#]+\[*)\]`)
@@ -155,9 +155,10 @@ func overlayStyle(background tcell.Color, defaultStyle tcell.Style, fgColor, bgC
 	if attributes == "-" {
 		style = style.Bold(defAttr&tcell.AttrBold > 0)
 		style = style.Blink(defAttr&tcell.AttrBlink > 0)
+		style = style.Dim(defAttr&tcell.AttrDim > 0)
+		style = style.Italic(defAttr&tcell.AttrItalic > 0)
 		style = style.Reverse(defAttr&tcell.AttrReverse > 0)
 		style = style.Underline(defAttr&tcell.AttrUnderline > 0)
-		style = style.Dim(defAttr&tcell.AttrDim > 0)
 	} else if attributes != "" {
 		style = style.Normal()
 		for _, flag := range attributes {
@@ -168,6 +169,8 @@ func overlayStyle(background tcell.Color, defaultStyle tcell.Style, fgColor, bgC
 				style = style.Bold(true)
 			case 'd':
 				style = style.Dim(true)
+			case 'i':
+				style = style.Italic(true)
 			case 'r':
 				style = style.Reverse(true)
 			case 'u':