Use shell to execute filters, fix non-determinism

config/config.go

@@ -158,7 +158,8 @@ func LoadConfig(root *string) (*AercConfig, error) {
 	}
 	if filters, err := file.GetSection("filters"); err == nil {
 		// TODO: Parse the filter more finely, e.g. parse the regex
-		for match, cmd := range filters.KeysHash() {
+		for _, match := range filters.KeyStrings() {
+			cmd := filters.KeysHash()[match]
 			filter := FilterConfig{
 				Command: cmd,
 				Filter:  match,

widgets/msgviewer.go

@@ -107,16 +107,13 @@ func NewMessageViewer(conf *config.AercConfig, store *lib.MessageStore,
 	}
 	pager = exec.Command(cmd[0], cmd[1:]...)
 
+	fmt.Printf("%v\n", conf.Filters)
 	for _, f := range conf.Filters {
-		cmd, err = shlex.Split(f.Command)
-		if err != nil {
-			goto handle_error
-		}
 		mime := msg.BodyStructure.MIMEType + "/" + msg.BodyStructure.MIMESubType
 		switch f.FilterType {
 		case config.FILTER_MIMETYPE:
 			if fnmatch.Match(f.Filter, mime, 0) {
-				filter = exec.Command(cmd[0], cmd[1:]...)
+				filter = exec.Command("sh", "-c", f.Command)
 			}
 		case config.FILTER_HEADER:
 			var header string
@@ -131,7 +128,7 @@ func NewMessageViewer(conf *config.AercConfig, store *lib.MessageStore,
 				header = formatAddresses(msg.Envelope.Cc)
 			}
 			if f.Regex.Match([]byte(header)) {
-				filter = exec.Command(cmd[0], cmd[1:]...)
+				filter = exec.Command("sh", "-c", f.Command)
 			}
 		}
 		if filter != nil {