1 files changed, 2 insertions, 28 deletions
diff --git a/gopher/response.go b/gopher/response.go
index 269176f..3651e07 100644
--- a/gopher/response.go
+++ b/gopher/response.go
@@ -5,12 +5,11 @@ import (
 	"fmt"
 	"io"
 	"mime"
-	"os"
 	"path"
 	"strings"
 	"sync"
-	"unicode/utf8"
 
+	"tildegit.org/tjp/sliderule/internal"
 	"tildegit.org/tjp/sliderule/internal/types"
 )
 
@@ -207,34 +206,9 @@ func GuessItemType(filepath string) types.Status {
 		return TextFileType
 	}
 
-	if contentsAreText(filepath) {
+	if internal.ContentsAreText(filepath) {
 		return TextFileType
 	}
 
 	return BinaryFileType
 }
-
-func contentsAreText(filepath string) bool {
-	f, err := os.Open(filepath)
-	if err != nil {
-		return false
-	}
-	defer func() { _ = f.Close() }()
-
-	var buf [1024]byte
-	n, err := f.Read(buf[:])
-	if err != nil {
-		return false
-	}
-
-	for i, c := range string(buf[:n]) {
-		if i+utf8.UTFMax > n {
-			// incomplete last char
-			break
-		}
-		if c == 0xFFFD || c < ' ' && c != '\n' && c != '\t' && c != '\f' {
-			return false
-		}
-	}
-	return true
-}