Added ANSI colors

ansi/Code.go

@@ -0,0 +1,51 @@
+package ansi
+
+import (
+	"fmt"
+	"io"
+
+	"git.akyoto.dev/go/color"
+)
+
+// Code represents an ANSI escape code.
+type Code int
+
+// Fprint writes the text in the given color to the writer.
+func (code Code) Fprint(writer io.Writer, args ...any) {
+	if !color.Terminal {
+		fmt.Fprint(writer, args...)
+		return
+	}
+
+	fmt.Fprintf(writer, "\x1b[%dm%s\x1b[0m", code, fmt.Sprint(args...))
+}
+
+// Print writes the text in the given color to standard output.
+func (code Code) Print(args ...any) {
+	if !color.Terminal {
+		fmt.Print(args...)
+		return
+	}
+
+	fmt.Printf("\x1b[%dm%s\x1b[0m", code, fmt.Sprint(args...))
+}
+
+// Printf formats according to a format specifier and writes the text in the given color to standard output.
+func (code Code) Printf(format string, args ...any) {
+	if !color.Terminal {
+		fmt.Printf(format, args...)
+		return
+	}
+
+	fmt.Printf("\x1b[%dm%s\x1b[0m", code, fmt.Sprintf(format, args...))
+}
+
+// Println writes the text in the given color to standard output and appends a newline.
+func (code Code) Println(args ...any) {
+	if !color.Terminal {
+		fmt.Println(args...)
+		return
+	}
+
+	fmt.Printf("\x1b[%dm%s\n\x1b[0m", code, fmt.Sprint(args...))
+}