Implement Capitalization (#118)

ansi/baseelement.go

@@ -3,6 +3,7 @@ package ansi
 import (
 	"bytes"
 	"io"
+	"strings"
 	"text/template"
 
 	"github.com/muesli/termenv"
@@ -38,13 +39,21 @@ func renderText(w io.Writer, p termenv.Profile, rules StylePrimitive, s string)
 
 	out := termenv.String(s)
 
+	if rules.Upper != nil && *rules.Upper {
+		out = termenv.String(strings.ToUpper(s))
+	}
+	if rules.Lower != nil && *rules.Lower {
+		out = termenv.String(strings.ToLower(s))
+	}
+	if rules.Title != nil && *rules.Title {
+		out = termenv.String(strings.Title(s))
+	}
 	if rules.Color != nil {
 		out = out.Foreground(p.Color(*rules.Color))
 	}
 	if rules.BackgroundColor != nil {
 		out = out.Background(p.Color(*rules.BackgroundColor))
 	}
-
 	if rules.Underline != nil && *rules.Underline {
 		out = out.Underline()
 	}

ansi/style.go

@@ -45,6 +45,9 @@ type StylePrimitive struct {
 	BackgroundColor *string `json:"background_color,omitempty"`
 	Underline       *bool   `json:"underline,omitempty"`
 	Bold            *bool   `json:"bold,omitempty"`
+	Upper           *bool   `json:"upper,omitempty"`
+	Lower           *bool   `json:"lower,omitempty"`
+	Title           *bool   `json:"title,omitempty"`
 	Italic          *bool   `json:"italic,omitempty"`
 	CrossedOut      *bool   `json:"crossed_out,omitempty"`
 	Faint           *bool   `json:"faint,omitempty"`
@@ -151,6 +154,9 @@ func cascadeStyle(parent StyleBlock, child StyleBlock, toBlock bool) StyleBlock
 	s.BackgroundColor = parent.BackgroundColor
 	s.Underline = parent.Underline
 	s.Bold = parent.Bold
+	s.Upper = parent.Upper
+	s.Title = parent.Title
+	s.Lower = parent.Lower
 	s.Italic = parent.Italic
 	s.CrossedOut = parent.CrossedOut
 	s.Faint = parent.Faint
@@ -186,6 +192,15 @@ func cascadeStyle(parent StyleBlock, child StyleBlock, toBlock bool) StyleBlock
 	if child.Bold != nil {
 		s.Bold = child.Bold
 	}
+	if child.Upper != nil {
+		s.Upper = child.Upper
+	}
+	if child.Lower != nil {
+		s.Lower = child.Lower
+	}
+	if child.Title != nil {
+		s.Title = child.Title
+	}
 	if child.Italic != nil {
 		s.Italic = child.Italic
 	}