Add Option to Ignore Minor Writing Errors in Exiftool (-m Flag) (#72)

This pull request introduces a new configuration option, IgnoreMinorErrors, that makes Exiftool ignore minor errors when writing metadata. This is done by passing the -m argument to Exiftool.

More info on the `-m` flag
https://exiftool.org/exiftool_pod.html#Processing-control

Author: xob0t

exiftool.go

@@ -48,6 +48,7 @@ type Exiftool struct {
 	cmd                      *exec.Cmd
 	backupOriginal           bool
 	clearFieldsBeforeWriting bool
+	ignoreMinorErrors        bool
 }
 
 // NewExiftool instanciates a new Exiftool with configuration functions. If anything went
@@ -233,6 +234,13 @@ func (e *Exiftool) WriteMetadata(fileMetadata []FileMetadata) {
 			}
 		}
 
+		if e.ignoreMinorErrors {
+			if _, err := fmt.Fprintln(e.stdin, "-m"); err != nil {
+				fileMetadata[i].Err = err
+				continue
+			}
+		}
+
 		if e.clearFieldsBeforeWriting {
 			if _, err := fmt.Fprintln(e.stdin, "-All="); err != nil {
 				fileMetadata[i].Err = err
@@ -418,6 +426,17 @@ func BackupOriginal() func(*Exiftool) error {
 	}
 }
 
+// IgnoreMinorErrors sets a `-m` arg to ignore minor exiftool errors when writing the file metadata
+// Sample :
+//
+//	e, err := NewExiftool(IgnoreMinorErrors())
+func IgnoreMinorErrors() func(*Exiftool) error {
+	return func(e *Exiftool) error {
+		e.ignoreMinorErrors = true
+		return nil
+	}
+}
+
 // ClearFieldsBeforeWriting will clear existing fields (e.g. tags) in the file before writing any
 // new tags
 // Sample :