Remove unused method

files/utils.go

@@ -2,54 +2,8 @@ package files
 
 import (
 	"os"
-	"unicode/utf8"
 )
 
-func isBinary(content []byte) bool {
-	maybeStr := string(content)
-	runeCnt := utf8.RuneCount(content)
-	runeIndex := 0
-	gotRuneErrCnt := 0
-	firstRuneErrIndex := -1
-
-	const (
-		// 8 and below are control chars (e.g. backspace, null, eof, etc)
-		maxControlCharsCode = 8
-		// 0xFFFD(65533) is  the "error" Rune or "Unicode replacement character"
-		// see https://golang.org/pkg/unicode/utf8/#pkg-constants
-		unicodeReplacementChar = 0xFFFD
-	)
-
-	for _, b := range maybeStr {
-		if b <= maxControlCharsCode {
-			return true
-		}
-
-		if b == unicodeReplacementChar {
-			// if it is not the last (utf8.UTFMax - x) rune
-			if runeCnt > utf8.UTFMax && runeIndex < runeCnt-utf8.UTFMax {
-				return true
-			}
-			// else it is the last (utf8.UTFMax - x) rune
-			// there maybe Vxxx, VVxx, VVVx, thus, we may got max 3 0xFFFD rune (assume V is the byte we got)
-			// for Chinese, it can only be Vxx, VVx, we may got max 2 0xFFFD rune
-			gotRuneErrCnt++
-
-			// mark the first time
-			if firstRuneErrIndex == -1 {
-				firstRuneErrIndex = runeIndex
-			}
-		}
-		runeIndex++
-	}
-
-	// if last (utf8.UTFMax - x ) rune has the "error" Rune, but not all
-	if firstRuneErrIndex != -1 && gotRuneErrCnt != runeCnt-firstRuneErrIndex {
-		return true
-	}
-	return false
-}
-
 func IsNamedPipe(mode os.FileMode) bool {
 	return mode&os.ModeNamedPipe != 0
 }