feat: update to go modules

vendor/github.com/alecthomas/chroma/formatter.go

@@ -1,43 +0,0 @@
-package chroma
-
-import (
-	"io"
-)
-
-// A Formatter for Chroma lexers.
-type Formatter interface {
-	// Format returns a formatting function for tokens.
-	//
-	// If the iterator panics, the Formatter should recover.
-	Format(w io.Writer, style *Style, iterator Iterator) error
-}
-
-// A FormatterFunc is a Formatter implemented as a function.
-//
-// Guards against iterator panics.
-type FormatterFunc func(w io.Writer, style *Style, iterator Iterator) error
-
-func (f FormatterFunc) Format(w io.Writer, s *Style, it Iterator) (err error) {
-	defer func() {
-		if perr := recover(); perr != nil {
-			err = perr.(error)
-		}
-	}()
-	return f(w, s, it)
-}
-
-type recoveringFormatter struct {
-	Formatter
-}
-
-func (r recoveringFormatter) Format(w io.Writer, s *Style, it Iterator) (err error) {
-	defer func() {
-		if perr := recover(); perr != nil {
-			err = perr.(error)
-		}
-	}()
-	return r.Formatter.Format(w, s, it)
-}
-
-// RecoveringFormatter wraps a formatter with panic recovery.
-func RecoveringFormatter(formatter Formatter) Formatter { return recoveringFormatter{formatter} }