Optimize the services implementation

Dont construct the selection string when we are merely checking if a
selection exists.

kitty/boss.py

@@ -1985,6 +1985,12 @@ class Boss:
             return w.text_for_selection()
         return None
 
+    def has_active_selection(self) -> bool:
+        w = self.active_window
+        if w is not None and not w.destroyed:
+            return w.has_selection()
+        return False
+
     @ac('cp', '''
         Copy the selection from the active window to the specified buffer
 

kitty/glfw-wrapper.c

@@ -41,6 +41,9 @@ load_glfw(const char* path) {
     *(void **) (&glfwSetCurrentSelectionCallback_impl) = dlsym(handle, "glfwSetCurrentSelectionCallback");
     if (glfwSetCurrentSelectionCallback_impl == NULL) fail("Failed to load glfw function glfwSetCurrentSelectionCallback with error: %s", dlerror());
 
+    *(void **) (&glfwSetHasCurrentSelectionCallback_impl) = dlsym(handle, "glfwSetHasCurrentSelectionCallback");
+    if (glfwSetHasCurrentSelectionCallback_impl == NULL) fail("Failed to load glfw function glfwSetHasCurrentSelectionCallback with error: %s", dlerror());
+
     *(void **) (&glfwTerminate_impl) = dlsym(handle, "glfwTerminate");
     if (glfwTerminate_impl == NULL) fail("Failed to load glfw function glfwTerminate with error: %s", dlerror());
 

kitty/glfw-wrapper.h

@@ -1457,6 +1457,7 @@ typedef void (* GLFWtickcallback)(void*);
 typedef void (* GLFWactivationcallback)(GLFWwindow *window, const char *token, void *data);
 typedef bool (* GLFWdrawtextfun)(GLFWwindow *window, const char *text, uint32_t fg, uint32_t bg, uint8_t *output_buf, size_t width, size_t height, float x_offset, float y_offset, size_t right_margin);
 typedef char* (* GLFWcurrentselectionfun)(void);
+typedef bool (* GLFWhascurrentselectionfun)(void);
 typedef void (* GLFWclipboarddatafreefun)(void* data);
 typedef struct GLFWDataChunk {
     const char *data;
@@ -1662,6 +1663,10 @@ typedef GLFWcurrentselectionfun (*glfwSetCurrentSelectionCallback_func)(GLFWcurr
 GFW_EXTERN glfwSetCurrentSelectionCallback_func glfwSetCurrentSelectionCallback_impl;
 #define glfwSetCurrentSelectionCallback glfwSetCurrentSelectionCallback_impl
 
+typedef GLFWhascurrentselectionfun (*glfwSetHasCurrentSelectionCallback_func)(GLFWhascurrentselectionfun);
+GFW_EXTERN glfwSetHasCurrentSelectionCallback_func glfwSetHasCurrentSelectionCallback_impl;
+#define glfwSetHasCurrentSelectionCallback glfwSetHasCurrentSelectionCallback_impl
+
 typedef void (*glfwTerminate_func)(void);
 GFW_EXTERN glfwTerminate_func glfwTerminate_impl;
 #define glfwTerminate glfwTerminate_impl

kitty/glfw.c

@@ -496,6 +496,16 @@ get_current_selection(void) {
     return ans;
 }
 
+static bool
+has_current_selection(void) {
+    if (!global_state.boss) return false;
+    PyObject *ret = PyObject_CallMethod(global_state.boss, "has_active_selection", NULL);
+    if (!ret) { PyErr_Print(); return false; }
+    bool ans = ret == Py_True;
+    Py_DECREF(ret);
+    return ans;
+}
+
 
 static void get_window_dpi(GLFWwindow *w, double *x, double *y);
 
@@ -800,6 +810,7 @@ create_os_window(PyObject UNUSED *self, PyObject *args, PyObject *kw) {
         if (OPT(hide_window_decorations) & 1) glfwWindowHint(GLFW_DECORATED, false);
         glfwSetApplicationCloseCallback(application_close_requested_callback);
         glfwSetCurrentSelectionCallback(get_current_selection);
+        glfwSetHasCurrentSelectionCallback(has_current_selection);
 #ifdef __APPLE__
         cocoa_set_activation_policy(OPT(macos_hide_from_tasks));
         glfwWindowHint(GLFW_COCOA_GRAPHICS_SWITCHING, true);

kitty/screen.c

@@ -2785,7 +2785,12 @@ screen_detect_url(Screen *screen, unsigned int x, unsigned int y) {
 #define WRAP2B(name) static PyObject* name(Screen *self, PyObject *args) { unsigned int a, b; int p; if(!PyArg_ParseTuple(args, "IIp", &a, &b, &p)) return NULL; screen_##name(self, a, b, (bool)p); Py_RETURN_NONE; }
 
 WRAP0(garbage_collect_hyperlink_pool)
-WRAP0x(has_selection)
+
+static PyObject*
+has_selection(Screen *self, PyObject *a UNUSED) {
+    if (screen_has_selection(self)) Py_RETURN_TRUE;
+    Py_RETURN_FALSE;
+}
 
 static PyObject*
 hyperlinks_as_list(Screen *self, PyObject *args UNUSED) {
@@ -4076,7 +4081,7 @@ static PyMethodDef methods[] = {
     MND(cursor_down1, METH_VARARGS)
     MND(cursor_forward, METH_VARARGS)
     {"index", (PyCFunction)xxx_index, METH_VARARGS, ""},
-    {"has_selection", (PyCFunction)xxx_has_selection, METH_VARARGS, ""},
+    {"has_selection", (PyCFunction)has_selection, METH_VARARGS, ""},
     MND(set_pending_timeout, METH_O)
     MND(as_text, METH_VARARGS)
     MND(as_text_non_visual, METH_VARARGS)

kitty/window.py

@@ -1354,6 +1354,9 @@ class Window:
         lines = self.screen.text_for_selection(as_ansi, strip_trailing_spaces)
         return ''.join(lines)
 
+    def has_selection(self) -> bool:
+        return self.screen.has_selection()
+
     def call_watchers(self, which: Iterable[Watcher], data: Dict[str, Any]) -> None:
         boss = get_boss()
         for w in which: