Add new param_list method

README.md

@@ -112,6 +112,10 @@ The commands supported by mod-host are:
         * show the preset information of requested instance / URI
         e.g.: preset_show 0 http://drobilla.net/plugins/mda/presets#EPiano-bright
 
+    param_list <instance_number>
+        * list the available controls for an instance
+        e.g.: param_list 0
+
     param_set <instance_number> <param_symbol> <param_value>
         * set a value to given control
         e.g.: param_set 0 gain 2.50

doc/mod-host.1

@@ -113,6 +113,9 @@ preset_save <instance_number> <preset_name> <dir> <file_name>
 preset_show <instance_number> <preset_uri>
     * show the preset information of requested instance / URI
     e.g.: preset_show 0 http://drobilla.net/plugins/mda/presets#EPiano\-bright
+param_list <instance_number>
+    * list the available controls for an instance
+    e.g.: param_list 0
 param_set <instance_number> <param_symbol> <param_value>
     * set a value to given control
     e.g.: param_set 0 gain 2.50

src/completer.c

@@ -55,6 +55,7 @@ static char *g_commands[] = {
     "connect",
     "disconnect",
     "bypass",
+    "param_list",
     "param_set",
     "param_get",
     "param_monitor",
@@ -256,6 +257,13 @@ static char **completion(const char *text, int start, int end)
                     get_instances = 1;
                 }
             }
+            else if (strcmp(cmd[0], "param_list") == 0)
+            {
+                if (count == 1)
+                {
+                    get_instances = 1;
+                }
+            }
             else if (strcmp(cmd[0], "param_get") == 0)
             {
                 if (count == 1)

src/mod-host.c

@@ -211,6 +211,44 @@ static void effects_bypass_cb(proto_t *proto)
     protocol_response(buffer, proto);
 }
 
+static void effects_list_param_cb(proto_t *proto)
+{
+	char ** symbols = (char **) calloc(128, sizeof(char *));
+
+	int resp = effects_get_parameter_symbols(atoi(proto->list[1]), symbols);
+
+	if (resp != SUCCESS)
+	{
+		char buffer[128];
+		sprintf(buffer, "resp %i ", resp);
+		protocol_response(buffer, proto);
+	}
+	else
+	{
+		int length = 0;
+		char *name = NULL;
+		for (int i = 0; (name = symbols[i]) != NULL; i++)
+		{
+			length += strlen(name) + 1;
+		}
+
+		char buffer[length];
+		char *bufferIndex = &buffer[0];
+		for (int i = 0; (name = symbols[i]) != NULL; i++)
+		{
+			strcpy(bufferIndex, name);
+			bufferIndex += strlen(name);
+
+			*bufferIndex = ' ';
+			bufferIndex++;
+		}
+		*(bufferIndex - 1) = '\0';
+		protocol_response(buffer, proto);
+	}
+
+	free (symbols);
+}
+
 static void effects_set_param_cb(proto_t *proto)
 {
     int resp;
@@ -463,6 +501,7 @@ static int mod_host_init(jack_client_t* client, int socket_port)
     protocol_add_command(EFFECT_CONNECT, effects_connect_cb);
     protocol_add_command(EFFECT_DISCONNECT, effects_disconnect_cb);
     protocol_add_command(EFFECT_BYPASS, effects_bypass_cb);
+    protocol_add_command(EFFECT_PARAM_LIST, effects_list_param_cb);
     protocol_add_command(EFFECT_PARAM_SET, effects_set_param_cb);
     protocol_add_command(EFFECT_PARAM_GET, effects_get_param_cb);
     protocol_add_command(EFFECT_PARAM_MON, effects_monitor_param_cb);

src/mod-host.h

@@ -59,6 +59,7 @@
 #define EFFECT_CONNECT      "connect %s %s"
 #define EFFECT_DISCONNECT   "disconnect %s %s"
 #define EFFECT_BYPASS       "bypass %i %i"
+#define EFFECT_PARAM_LIST   "param_list %i"
 #define EFFECT_PARAM_SET    "param_set %i %s %s"
 #define EFFECT_PARAM_GET    "param_get %i %s"
 #define EFFECT_PARAM_MON    "param_monitor %i %s %s %f"

src/protocol.h

@@ -48,7 +48,7 @@
 ************************************************************************************************************************
 */
 
-#define PROTOCOL_MAX_COMMANDS       24
+#define PROTOCOL_MAX_COMMANDS       25
 
 // error messages configuration
 #define MESSAGE_COMMAND_NOT_FOUND   "not found"