feat: add dispatch spawn_on_empty

config.conf

@@ -265,7 +265,9 @@ bind=ALT+SHIFT,Z,incgaps,-1
 bind=ALT+SHIFT,R,togglegaps
 
 #custom app bind example
-# bind=SUPER,Return,spawn,google-chrome
+# spawn_on_empty (if tag 4 is empty , open app in this,otherwise view to tag 4)
+# bind=SUPER,Return,spawn_on_empty,google-chrome,4
+# spawn
 # bind=CTRL+ALT,Return,spawn,st -e ~/tool/ter-multiplexer.sh
 
 # Mouse Button Bindings

dispatch.h

@@ -19,6 +19,7 @@ void togglemaxmizescreen(const Arg *arg);
 void togglegaps(const Arg *arg);
 void tagmon(const Arg *arg);
 void spawn(const Arg *arg);
+void spawn_on_empty(const Arg *arg);
 void setlayout(const Arg *arg);
 void switch_layout(const Arg *arg);
 void setmfact(const Arg *arg);

maomao.c

@@ -5287,6 +5287,25 @@ void spawn(const Arg *arg) {
   }
 }
 
+void spawn_on_empty(const Arg *arg) {
+  bool is_empty = true;
+  Client *c;
+  
+  wl_list_for_each(c, &clients, link) {
+    if (arg->ui & c->tags) {
+      is_empty = false;
+      break;
+    }
+  }
+  if(!is_empty) {
+    view(arg,true);
+    return;
+  } else {
+    view(arg,true);
+    spawn(arg);
+  }
+}
+
 void startdrag(struct wl_listener *listener, void *data) {
   struct wlr_drag *drag = data;
   if (!drag->icon)

parse_config.h

@@ -449,6 +449,15 @@ FuncType parse_func_name(char *func_name, Arg *arg, char *arg_value) {
   } else if (strcmp(func_name, "spawn") == 0) {
     func = spawn;
     (*arg).v = strdup(arg_value);
+  } else if (strcmp(func_name, "spawn_on_empty") == 0) {
+    char cmd[256],tag_num[256];
+    if (sscanf(arg_value, "%255[^,],%255s", cmd, tag_num) == 2) {
+      func = spawn_on_empty;
+      (*arg).v = strdup(cmd); // 注意：之后需要释放这个内存
+      (*arg).ui = 1 << (atoi(tag_num) - 1);
+    } else {
+      fprintf(stderr, "Error: Invalid value format: %s\n", arg_value);      
+    }
   } else if (strcmp(func_name, "quit") == 0) {
     func = quit;
   } else if (strcmp(func_name, "moveresize") == 0) {