Merge pull request #24 from Kjeldgaard/AddExtraArguments

"NoPrintConversion" functional option

exiftool.go

@@ -184,4 +184,14 @@ func Charset(charset string) func(*Exiftool) error {
 		e.extraInitArgs = append(e.extraInitArgs, "-charset", charset)
 		return nil
 	}
-}
+}
+
+// NoPrintConversion enables 'No print conversion' mode, see https://exiftool.org/exiftool_pod.html.
+// Sample :
+//   e, err := NewExiftool(NoPrintConversion())
+func NoPrintConversion() func(*Exiftool) error {
+	return func(e *Exiftool) error {
+		e.extraInitArgs = append(e.extraInitArgs, "-n")
+		return nil
+	}
+}

exiftool_test.go

@@ -233,4 +233,23 @@ func TestNewExifTool_WithCharset(t *testing.T) {
 	metas := e.ExtractMetadata("./testdata/20190404_131804.jpg")
 	assert.Equal(t, 1, len(metas))
 	assert.Nil(t, metas[0].Err)
-}
+}
+
+func TestNoPrintConversion(t *testing.T) {
+	e, err := NewExiftool(NoPrintConversion())
+	assert.Nil(t, err)
+	defer e.Close()
+
+	metas := e.ExtractMetadata("./testdata/20190404_131804.jpg")
+	assert.Equal(t, 1, len(metas))
+	assert.Nil(t, metas[0].Err)
+
+	for _, meta := range metas {
+		if meta.Err != nil {
+			continue
+		}
+		expProgram, err := meta.GetInt("ExposureProgram")
+		assert.Nil(t, err)
+		assert.Equal(t, int64(2), expProgram)
+	}
+}