Added option to select primary display on tray_output

docs/userguide

@@ -964,7 +964,7 @@ you can turn off the functionality entirely.
 
 *Syntax*:
 -------------------------
-tray_output <none|output>
+tray_output <none|primary|output>
 -------------------------
 
 *Example*:
@@ -974,12 +974,20 @@ bar {
     tray_output none
 }
 
+# show tray icons on the primary monitor
+tray_output primary
+
 # show tray icons on the big monitor
 bar {
     tray_output HDMI2
 }
 -------------------------
 
+Note that you might not have a primary output configured yet. To do so, run:
+-------------------------
+xrandr --output <output> --primary
+-------------------------
+
 === Font
 
 Specifies the font (again, X core font, not Xft, just like in i3) to be used in

i3bar/include/outputs.h

@@ -40,6 +40,7 @@ i3_output* get_output_by_name(char* name);
 struct i3_output {
     char*          name;          /* Name of the output */
     bool           active;        /* If the output is active */
+    bool           primary;       /* If it is the primary output */
     int            ws;            /* The number of the currently visible ws */
     rect           rect;          /* The rect (relative to the root-win) */
 

i3bar/src/outputs.c

@@ -45,15 +45,19 @@ static int outputs_null_cb(void *params_) {
 static int outputs_boolean_cb(void *params_, int val) {
     struct outputs_json_params *params = (struct outputs_json_params*) params_;
 
-    if (strcmp(params->cur_key, "active")) {
-        return 0;
+    if (!strcmp(params->cur_key, "active")) {
+        params->outputs_walk->active = val;
+        FREE(params->cur_key);
+        return 1;
     }
 
-    params->outputs_walk->active = val;
+    if (!strcmp(params->cur_key, "primary")) {
+        params->outputs_walk->primary = val;
+        FREE(params->cur_key);
+        return 1;
+    }
 
-    FREE(params->cur_key);
-
-    return 1;
+    return 0;
 }
 
 /*

i3bar/src/xcb.c

@@ -450,9 +450,12 @@ static void handle_client_message(xcb_client_message_event_t* event) {
             SLIST_FOREACH(walk, outputs, slist) {
                 if (!walk->active)
                     continue;
-                if (config.tray_output &&
-                    strcasecmp(walk->name, config.tray_output) != 0)
-                    continue;
+                if (config.tray_output) {
+                    if ((strcasecmp(walk->name, config.tray_output) != 0) &&
+                        (!walk->primary || strcasecmp("primary", config.tray_output) != 0))
+                        continue;
+                }
+
                 DLOG("using output %s\n", walk->name);
                 output = walk;
             }

src/ipc.c

@@ -443,6 +443,9 @@ IPC_HANDLER(get_outputs) {
         ystr("active");
         y(bool, output->active);
 
+        ystr("primary");
+        y(bool, output->primary);
+
         ystr("rect");
         y(map_open);
         ystr("x");