feat(term): implement copy_selection()

Implements the copy_selection() method, which returns the selected text.

Adds a copy_on_selection property. When this property is enabled, the
selected text will automatically be copied to the primary clipboard
(Linux X11/Wayland only).

addons/godot_xterm/native/src/terminal.cpp

@@ -17,6 +17,10 @@
 #include <libtsm.h>
 #include <xkbcommon/xkbcommon-keysyms.h>
 
+#if defined(__linux)
+#include <godot_cpp/classes/display_server.hpp>
+#endif
+
 #define SHADERS_DIR "res://addons/godot_xterm/shaders/"
 #define FOREGROUND_SHADER_PATH SHADERS_DIR "foreground.gdshader"
 #define BACKGROUND_SHADER_PATH SHADERS_DIR "background.gdshader"
@@ -64,6 +68,12 @@ void Terminal::_bind_methods()
 	ClassDB::bind_method(D_METHOD("set_blink_off_time", "time"), &Terminal::set_blink_off_time);
 	ClassDB::add_property("Terminal", PropertyInfo(Variant::FLOAT, "blink_off_time"), "set_blink_off_time", "get_blink_off_time");
 
+	// Selection copying.
+	ClassDB::bind_method(D_METHOD("copy_selection"), &Terminal::copy_selection);
+	ClassDB::bind_method(D_METHOD("set_copy_on_selection", "enabled"), &Terminal::set_copy_on_selection);
+	ClassDB::bind_method(D_METHOD("get_copy_on_selection"), &Terminal::get_copy_on_selection);
+	ClassDB::add_property("Terminal", PropertyInfo(Variant::BOOL, "copy_on_selection"), "set_copy_on_selection", "get_copy_on_selection");
+
 	// Methods.
 
 	ClassDB::bind_method(D_METHOD("write", "data"), &Terminal::write);
@@ -89,6 +99,8 @@ Terminal::Terminal()
 	bell_timer->set_one_shot(true);
 	add_child(bell_timer, false, INTERNAL_MODE_FRONT);
 
+	copy_on_selection = false;
+
 	inverse_mode = InverseMode::INVERSE_MODE_INVERT;
 
 	if (tsm_screen_new(&screen, NULL, NULL))
@@ -629,6 +641,25 @@ double Terminal::get_blink_off_time() const
 	return blink_off_time;
 }
 
+String Terminal::copy_selection() {
+  char *out;
+  PackedByteArray data;
+
+  data.resize(tsm_screen_selection_copy(screen, &out));
+  memcpy(data.ptrw(), out, data.size());
+  std::free(out);
+
+  return data.get_string_from_utf8();
+}
+
+void Terminal::set_copy_on_selection(const bool p_enabled) {
+	copy_on_selection = p_enabled;
+}
+
+bool Terminal::get_copy_on_selection() const {
+	return copy_on_selection;
+}
+
 void Terminal::set_inverse_mode(const int mode) {
 	inverse_mode = static_cast<InverseMode>(mode);
 
@@ -754,6 +785,12 @@ void Terminal::_handle_selection(Ref<InputEventMouse> event) {
 
 void Terminal::_on_selection_held() {
   if (!(Input::get_singleton()->is_mouse_button_pressed(MOUSE_BUTTON_LEFT)) || selection_mode == SelectionMode::NONE) {
+	#if defined(__linux__)
+	if (copy_on_selection) {
+		DisplayServer::get_singleton()->clipboard_set_primary(copy_selection());
+	}
+	#endif
+
     selection_timer->stop();
     return;
   }

addons/godot_xterm/native/src/terminal.h

@@ -71,6 +71,10 @@ namespace godot
     void set_blink_off_time(const double p_blink_off_time);
     double get_blink_off_time() const;
 
+    String copy_selection();
+    void set_copy_on_selection(const bool p_enable);
+    bool get_copy_on_selection() const;
+
     void set_inverse_mode(const int mode);
     int get_inverse_mode() const;
 
@@ -89,6 +93,8 @@ namespace godot
     double blink_on_time;
     double blink_off_time;
 
+    bool copy_on_selection;
+
     InverseMode inverse_mode;
 
     RenderingServer *rs;

test/test_terminal.gd

@@ -32,8 +32,7 @@ class TestInterface:
 	func test_has_property_blink_off_time():
 		assert_has_property_with_default_value("blink_off_time", 0.3)
 
-	# TODO: Implement copy_on_selection property.
+	func test_has_property_copy_on_selection():
-	func xtest_has_property_copy_on_selection():
 		assert_has_property_with_default_value("copy_on_selection", false)
 
 	# TODO: Implement update_mode property.
@@ -53,8 +52,7 @@ class TestInterface:
 	func xtest_has_method_copy_all():
 		assert_has_method_with_return_type("copy_all", TYPE_STRING)
 
-	# TODO: Implement copy_selection() method.
+	func test_has_method_copy_selection():
-	func xtest_has_method_copy_selection():
 		assert_has_method_with_return_type("copy_selection", TYPE_STRING)
 
 	func test_has_method_get_cols():