added text indexing

pkg/scan/scanner.go

@@ -108,11 +108,23 @@ func (s *Scanner) Scan(file string) (filename, text string, err error) {
 	file = fs.Clean(file)
 	scanfile := filepath.Join(s.base, file)
 	var pdffile string
-	pdf := isPDF(scanfile)
-	if !pdf {
-		if !isImage(scanfile) {
-			err = errors.New("error: input file is not an image")
-			return
+	ft := s.newFileType(scanfile)
+	if !ft.pdf {
+		if !ft.image {
+			if ft.text {
+				log.V(2).Info("indexing plaintext file", "file", scanfile)
+				var buf []byte
+				buf, err = os.ReadFile(scanfile)
+				if err != nil {
+					return
+				}
+				filename = file
+				text = string(nlr.ReplaceAll(wsr.ReplaceAll(buf, ws), nl))
+				return
+			} else {
+				err = errors.New("error: input: no image, pdf or text file")
+				return
+			}
 		}
 		var (
 			pdf []byte
@@ -154,7 +166,7 @@ func (s *Scanner) Scan(file string) (filename, text string, err error) {
 		return
 	}
 	text = string(nlr.ReplaceAll(wsr.ReplaceAll(txt, ws), nl))
-	if !pdf {
+	if !ft.pdf {
 		err = os.Remove(scanfile)
 	}
 	return