invalid port names detected and auto-fixed on file load

fixes #14

src/jack-audio-module-widget.cc

@@ -252,12 +252,25 @@ json_t* jack_audio_module_widget_base::toJson() {
 }
 
 void jack_audio_module_widget_base::fromJson(json_t* json) {
+   auto module = reinterpret_cast<JackAudioModule*>(this->module);
    auto port_names = json_object_get(json, "port_names");
    if (json_is_array(port_names)) {
       for (size_t i = 0; i < std::min(json_array_size(port_names), (size_t)8); i++) {
 	 auto item = json_array_get(port_names, i);
 	 if (json_is_string(item)) {
-	    this->port_names[i]->setText(std::string(json_string_value(item), json_string_length(item)));
+	    if (module->jport[i].rename(json_string_value(item))) {
+	       this->port_names[i]->text = std::string(json_string_value(item));
+	    } else {
+	       static const size_t buffer_size = 128;
+	       char port_name[buffer_size];
+	       hashidsxx::Hashids hash(g_hashid_salt);
+	       std::string id = hash.encode(reinterpret_cast<size_t>(module));
+
+	       snprintf(reinterpret_cast<char*>(&port_name),
+			buffer_size,
+			"%s:%d", id.c_str(), (int)i);
+	       this->port_names[i]->setText(std::string(port_name));
+	    }
 	 }
       }
    }

src/jaq.cc

@@ -37,23 +37,36 @@ namespace jaq {
 
       m_output = (flags & JackPortIsOutput) > 0;
 
-      static const size_t buffer_size = 128;
+      static const size_t buffer_size = 256;
       char port_name[buffer_size];
       snprintf
 	 (reinterpret_cast<char*>(&port_name),
 	  buffer_size,
-	  "%s-%s",
-	  name,			  // desired port name
+	  "%s:%s-%s",
+	  jack_get_client_name(mom.handle),
+	  name,			    // desired port name
 	  m_output ? "out" : "in"); // idiomatic suffix
 
-      handle = client::x_jack_port_register(
-	 mom.handle,
-	 name,
-	 JACK_DEFAULT_AUDIO_TYPE,
-	 flags,
-	 0);
+      auto x = client::x_jack_port_by_name(mom.handle, port_name);
+
+      if (x == NULL) {
+	 snprintf
+	    (reinterpret_cast<char*>(&port_name),
+	     buffer_size,
+	     "%s-%s",
+	     name,		       // desired port name
+	     m_output ? "out" : "in"); // idiomatic suffix
+
+	 handle = client::x_jack_port_register(
+	    mom.handle,
+	    name,
+	    JACK_DEFAULT_AUDIO_TYPE,
+	    flags,
+	    0);
+      } else return false;
 
       if (handle) return true;
+
       else {
 	 this->mom = 0;
 	 return false;