feat(term): implement copy_all()

Implements the copy_all() method which copies all text in the screen
including text in the scrollback buffer.

Includes a fix to an upstream bug in libtsm that resulted in double the
number of '\n' characters being copied for each row.

.gitmodules

@@ -6,7 +6,7 @@
 	url = https://github.com/libuv/libuv
 [submodule "addons/godot_xterm/native/thirdparty/libtsm"]
 	path = addons/godot_xterm/native/thirdparty/libtsm
-	url = https://github.com/Aetf/libtsm
+	url = https://github.com/lihop/libtsm
 [submodule "addons/godot_xterm/native/thirdparty/node-pty"]
 	path = addons/godot_xterm/native/thirdparty/node-pty
 	url = https://github.com/microsoft/node-pty

addons/godot_xterm/native/src/terminal.cpp

@@ -68,7 +68,8 @@ 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.
+	// Copying.
+	ClassDB::bind_method(D_METHOD("copy_all"), &Terminal::copy_all);
 	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);
@@ -641,17 +642,25 @@ double Terminal::get_blink_off_time() const
 	return blink_off_time;
 }
 
-String Terminal::copy_selection() {
+String Terminal::_copy_screen(ScreenCopyFunction func) {
 	char *out;
 	PackedByteArray data;
 
-  data.resize(tsm_screen_selection_copy(screen, &out));
+	data.resize(func(screen, &out));
 	memcpy(data.ptrw(), out, data.size());
 	std::free(out);
 
 	return data.get_string_from_utf8();
 }
 
+String Terminal::copy_all() {
+	return _copy_screen(&tsm_screen_copy_all);
+}
+
+String Terminal::copy_selection() {
+	return _copy_screen(&tsm_screen_selection_copy);
+}
+
 void Terminal::set_copy_on_selection(const bool p_enabled) {
 	copy_on_selection = p_enabled;
 }

addons/godot_xterm/native/src/terminal.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <functional>
 #include <map>
 
 #include <godot_cpp/classes/control.hpp>
@@ -71,6 +72,7 @@ namespace godot
     void set_blink_off_time(const double p_blink_off_time);
     double get_blink_off_time() const;
 
+    String copy_all();
     String copy_selection();
     void set_copy_on_selection(const bool p_enable);
     bool get_copy_on_selection() const;
@@ -170,6 +172,9 @@ namespace godot
     Timer *selection_timer;
     void _handle_selection(Ref<InputEventMouse> event);
     void _on_selection_held();
+
+    typedef std::function<int(struct tsm_screen*, char**)> ScreenCopyFunction;
+    String _copy_screen(ScreenCopyFunction func);
   };
 
 } // namespace godot

addons/godot_xterm/native/thirdparty/libtsm

@@ -1 +1 @@
-Subproject commit 2131b47acdee1088a78ca922ca96361d6182a03f
+Subproject commit fa5021916aa8f4e292ae6dbbf9fc874ae517c3a3

test/test_terminal.gd

@@ -48,8 +48,7 @@ class TestInterface:
 	func xtest_has_method_clear():
 		assert_has_method_with_return_type("clear", TYPE_NIL)
 
-	# TODO: Implement copy_all() method.
-	func xtest_has_method_copy_all():
+	func test_has_method_copy_all():
 		assert_has_method_with_return_type("copy_all", TYPE_STRING)
 
 	func test_has_method_copy_selection():
@@ -192,3 +191,32 @@ class TestWrite:
 	func test_data_sent_not_emitted_when_empty_string_written():
 		subject.write("")
 		assert_signal_emit_count(subject, "data_sent", 0)
+
+
+class TestCopy:
+	extends TerminalTest
+
+	func fill_screen(char: String = "A") -> String:
+		var result = char.repeat(subject.get_cols() * subject.get_rows())
+		subject.write(result)
+		return result
+
+	func test_copy_all_copies_the_entire_screen():
+		var text = fill_screen()
+		# The text will be wrapped over multiple lines and copy_all() preserves
+		# these line wraps, therefore we need to strip them.
+		assert_eq(subject.copy_all().replace("\n", ""), text)
+
+	func test_copy_all_empty_screen():
+		assert_eq(subject.copy_all(), "\n".repeat(subject.get_rows()))
+
+	func test_copy_all_copies_the_scrollback_buffer():
+		var text = fill_screen()
+		text += fill_screen("B")
+		text += fill_screen("C")
+		assert_eq(subject.copy_all().replace("\n", ""), text)
+
+	func test_copy_all_copies_unicode_text():
+		var text = "ｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿ"
+		subject.write(text)
+		assert_string_contains(subject.copy_all(), text)