refactor: add a clean termstyle file for styling

internal/output/output.go

@@ -7,12 +7,6 @@ import (
 	"strings"
 )
 
-const (
-	bold   = "\x1b[1m"
-	italic = "\x1b[3m"
-	reset  = "\x1b[0m"
-)
-
 var (
 	palette = struct {
 		miroPrefixGreen uint32
@@ -22,18 +16,14 @@ var (
 		miroChevronTeal: 0x1DD3B0,
 	}
 
-	chevron = ansiColor(palette.miroChevronTeal)
-	prefix  = ansiColor(palette.miroPrefixGreen) + bold + italic + "miro" + reset + " " + chevron + bold + italic + "›" + reset + " "
+	chevron = NewStyle().FG(palette.miroChevronTeal).Bold().Italic().Apply("›")
+	prefix  = NewStyle().FG(palette.miroPrefixGreen).Bold().Italic().Apply("miro") + " " + chevron + " "
 )
 
 func Prefix() string {
 	return prefix
 }
 
-func ansiColor(rgb uint32) string {
-	return fmt.Sprintf("\x1b[38;2;%d;%d;%dm", byte(rgb>>16), byte(rgb>>8), byte(rgb))
-}
-
 func Format(msg string) string {
 	body := strings.TrimRight(msg, "\n")
 	suffix := msg[len(body):]

internal/output/termstyle.go

@@ -0,0 +1,70 @@
+package output
+
+import "fmt"
+
+const (
+	ansiBold   = "\x1b[1m"
+	ansiItalic = "\x1b[3m"
+	ansiReset  = "\x1b[0m"
+)
+
+type Style struct {
+	bold   bool
+	italic bool
+	fg     *uint32
+	bg     *uint32
+}
+
+func NewStyle() Style {
+	return Style{}
+}
+
+func (s Style) Bold() Style {
+	s.bold = true
+	return s
+}
+
+func (s Style) Italic() Style {
+	s.italic = true
+	return s
+}
+
+func (s Style) FG(rgb uint32) Style {
+	s.fg = &rgb
+	return s
+}
+
+func (s Style) BG(rgb uint32) Style {
+	s.bg = &rgb
+	return s
+}
+
+func (s Style) Apply(text string) string {
+	if !s.bold && !s.italic && s.fg == nil && s.bg == nil {
+		return text
+	}
+
+	style := ""
+	if s.bold {
+		style += ansiBold
+	}
+	if s.italic {
+		style += ansiItalic
+	}
+	if s.fg != nil {
+		style += ansiFG(*s.fg)
+	}
+	if s.bg != nil {
+		style += ansiBG(*s.bg)
+	}
+
+	return style + text + ansiReset
+}
+
+func ansiFG(rgb uint32) string {
+	return fmt.Sprintf("\x1b[38;2;%d;%d;%dm", byte(rgb>>16), byte(rgb>>8), byte(rgb))
+}
+
+func ansiBG(rgb uint32) string {
+	return fmt.Sprintf("\x1b[48;2;%d;%d;%dm", byte(rgb>>16), byte(rgb>>8), byte(rgb))
+}