Only show love button when either mpdas or mpdscribble channel is

present and use the correct channel to send the message of love

htdocs/js/mpd.js

@@ -29,6 +29,7 @@ var current_song = new Object();
 var MAX_ELEMENTS_PER_PAGE = 512;
 var isTouch = Modernizr.touch ? 1 : 0;
 var filter = '';
+var scrobbler = '';
 
 var app = $.sammy(function () {
     function runBrowse() {
@@ -264,6 +265,7 @@ function webSocketConnect() {
             app.run();
             /* emit initial request for output names */
             socket.send('MPD_API_GET_OUTPUTS');
+            socket.send('MPD_API_GET_CHANNELS');
         };
 
         socket.onmessage = function got_packet(msg) {
@@ -815,6 +817,22 @@ function webSocketConnect() {
                     });
                     last_outputs = obj;
                     break;
+                case 'channels':
+                    scrobbler = '';
+                    $('#love').addClass('hide');
+                    if (Object.keys(obj.data).length) {
+                        $.each(obj.data, function (id, name) {
+                            switch (name) {
+                                case 'mpdas':
+                                case 'mpdscribble':
+                                    scrobbler = name;
+                                    $('#love').removeClass('hide');
+                                default:
+                                    break;
+                            }
+                        });
+                    }
+                    break;
                 case 'disconnected':
                     if ($('.top-right').has('div').length == 0)
                         $('.top-right')
@@ -1082,11 +1100,9 @@ function basename(path) {
 
 function clickLove() {
     socket.send(
-        'MPD_API_SEND_MESSAGE,mpdas,' +
-            ($('#btnlove').hasClass('active') ? 'unlove' : 'love')
-    );
-    socket.send(
-        'MPD_API_SEND_MESSAGE,mpdscribble,' +
+        'MPD_API_SEND_MESSAGE,' +
+            scrobbler +
+            ',' +
             ($('#btnlove').hasClass('active') ? 'unlove' : 'love')
     );
     if ($('#btnlove').hasClass('active')) $('#btnlove').removeClass('active');

src/mpd_client.c

@@ -259,6 +259,11 @@ int callback_mpd(struct mg_connection *c) {
         out_send_message:
             free(p_charbuf);
             break;
+        case MPD_API_GET_CHANNELS:
+            mpd.buf_size = mpd_put_channels(mpd.buf);
+            c->callback_param = NULL;
+            mpd_notify_callback(c, MG_POLL);
+            break;
 #ifdef WITH_MPD_HOST_CHANGE
         /* Commands allowed when disconnected from MPD server */
         case MPD_API_SET_MPDHOST:
@@ -550,6 +555,32 @@ int mpd_put_outputs(char *buffer, int names) {
     return str - buffer;
 }
 
+int mpd_put_channels(char *buffer) {
+    struct mpd_pair *channel;
+    int nchan;
+    char *str, *strend;
+
+    str = buffer;
+    strend = buffer + MAX_SIZE;
+    str += snprintf(str, strend - str, "{\"type\":\"%s\", \"data\":{", "channels");
+
+    mpd_send_channels(mpd.conn);
+    nchan = 0;
+    while ((channel = mpd_recv_channel_pair(mpd.conn)) != NULL) {
+        if (nchan++)
+            *str++ = ',';
+        str += snprintf(str, strend - str, " \"%d\":\"%s\"", nchan, channel->value);
+        mpd_return_pair(mpd.conn, channel);
+    }
+    if (!mpd_response_finish(mpd.conn)) {
+        fprintf(stderr, "MPD outputs: %s\n", mpd_connection_get_error_message(mpd.conn));
+        mpd_connection_clear_error(mpd.conn);
+        return 0;
+    }
+    str += snprintf(str, strend - str, " }}");
+    return str - buffer;
+}
+
 int mpd_put_current_song(char *buffer) {
     char *cur = buffer;
     const char *end = buffer + MAX_SIZE;

src/mpd_client.h

@@ -50,6 +50,7 @@
     X(MPD_API_RM_ALL)           \
     X(MPD_API_MOVE_TRACK)       \
     X(MPD_API_SEARCH)           \
+    X(MPD_API_GET_CHANNELS)     \
     X(MPD_API_SEND_MESSAGE)     \
     X(MPD_API_SET_VOLUME)       \
     X(MPD_API_SET_PAUSE)        \
@@ -109,6 +110,7 @@ int callback_mpd(struct mg_connection *c);
 int mpd_close_handler(struct mg_connection *c);
 int mpd_put_state(char *buffer, int *current_song_id, unsigned *queue_version);
 int mpd_put_outputs(char *buffer, int putnames);
+int mpd_put_channels(char *buffer);
 int mpd_put_current_song(char *buffer);
 int mpd_put_queue(char *buffer, unsigned int offset);
 int mpd_put_browse(char *buffer, char *path, unsigned int offset);