Improve colors' appearance in the editor's print_rich() output

This matches most terminals' behavior which don't use "pure" ANSI
colors anymore, but use modern color palettes instead.

editor/editor_log.cpp

@@ -121,6 +121,14 @@ void EditorLog::_update_theme() {
 	theme_cache.warning_color = get_theme_color(SNAME("warning_color"), EditorStringName(Editor));
 	theme_cache.warning_icon = get_editor_theme_icon(SNAME("Warning"));
 	theme_cache.message_color = get_theme_color(SceneStringName(font_color), EditorStringName(Editor)) * Color(1, 1, 1, 0.6);
+
+	// Used for `print_rich()` coloring.
+	theme_cache.red_color = get_theme_color(SNAME("red_color"), EditorStringName(Editor));
+	theme_cache.green_color = get_theme_color(SNAME("green_color"), EditorStringName(Editor));
+	theme_cache.yellow_color = get_theme_color(SNAME("yellow_color"), EditorStringName(Editor));
+	theme_cache.blue_color = get_theme_color(SNAME("blue_color"), EditorStringName(Editor));
+	theme_cache.magenta_color = get_theme_color(SNAME("magenta_color"), EditorStringName(Editor));
+	theme_cache.cyan_color = get_theme_color(SNAME("cyan_color"), EditorStringName(Editor));
 }
 
 void EditorLog::_editor_settings_changed() {
@@ -243,7 +251,7 @@ void EditorLog::_process_message(const String &p_msg, MessageType p_type, bool p
 
 void EditorLog::add_message(const String &p_msg, MessageType p_type) {
 	// Make text split by new lines their own message.
-	// See #41321 for reasoning. At time of writing, multiple print()'s in running projects
+	// See GH-41321 for reasoning. At time of writing, multiple print()'s in running projects
 	// get grouped together and sent to the editor log as one message. This can mess with the
 	// search functionality (see the comments on the PR above for more details). This behavior
 	// also matches that of other IDE's.
@@ -326,6 +334,58 @@ bool EditorLog::_check_display_message(LogMessage &p_message) {
 	return filter_active && search_match;
 }
 
+String EditorLog::_replace_color(const String &p_color) const {
+	// Replace colors with better-looking colors, which better match most terminal emulators out there.
+	if (p_color == "red") {
+		return theme_cache.red_color.to_html();
+	} else if (p_color == "green") {
+		return theme_cache.green_color.to_html();
+	} else if (p_color == "yellow") {
+		return theme_cache.yellow_color.to_html();
+	} else if (p_color == "blue") {
+		return theme_cache.blue_color.to_html();
+	} else if (p_color == "magenta") {
+		return theme_cache.magenta_color.to_html();
+	} else if (p_color == "cyan") {
+		return theme_cache.cyan_color.to_html();
+	}
+
+	// Return other colors as-is.
+	return p_color;
+}
+
+// Returns the string passed with BBCode colors replaced by better-looking color codes (according to the editor theme).
+String EditorLog::_replace_bbcode_colors(const String &p_string) const {
+	String result;
+	int buffer_start = 0;
+	int from = 0;
+
+	while (true) {
+		const int lb_pos = p_string.find_char('[', from);
+		if (lb_pos < 0) {
+			break;
+		}
+
+		const int rb_pos = p_string.find_char(']', lb_pos + 1);
+		if (rb_pos < 0) {
+			break;
+		}
+
+		const String tag = p_string.substr(lb_pos + 1, rb_pos - lb_pos - 1);
+		if (tag.begins_with("color=") || tag.begins_with("bgcolor=") || tag.begins_with("fgcolor=")) {
+			const int eq_pos = p_string.find_char('=', lb_pos + 1);
+			const String color = p_string.substr(eq_pos + 1, rb_pos - eq_pos - 1);
+			result += p_string.substr(buffer_start, eq_pos - buffer_start + 1) + _replace_color(color);
+			buffer_start = rb_pos;
+		}
+		from = rb_pos + 1;
+	}
+
+	result += p_string.substr(buffer_start);
+
+	return result;
+}
+
 void EditorLog::_add_log_line(LogMessage &p_message, bool p_replace_previous) {
 	if (!is_inside_tree()) {
 		// The log will be built all at once when it enters the tree and has its theme items.
@@ -382,7 +442,10 @@ void EditorLog::_add_log_line(LogMessage &p_message, bool p_replace_previous) {
 	}
 
 	if (p_message.type == MSG_TYPE_STD_RICH) {
-		log->append_text(p_message.text);
+		// Replace basic ANSI colors with more pleasant-looking colors, similar to what most terminals do out of the box.
+		// This also allows the printed colors to adapt to the current editor theme at the time of printing.
+		// Only replace the end of the color tag so that colors in `bgcolor` and `fgcolor` are replaced too.
+		log->append_text(_replace_bbcode_colors(p_message.text));
 	} else {
 		log->add_text(p_message.text);
 	}

editor/editor_log.h

@@ -79,6 +79,13 @@ class EditorLog : public HBoxContainer {
 		Ref<Texture2D> warning_icon;
 
 		Color message_color;
+
+		Color red_color;
+		Color green_color;
+		Color yellow_color;
+		Color blue_color;
+		Color magenta_color;
+		Color cyan_color;
 	} theme_cache;
 
 	// Encapsulates all data and functionality regarding filters.
@@ -162,6 +169,8 @@ class EditorLog : public HBoxContainer {
 	void _rebuild_log();
 	void _add_log_line(LogMessage &p_message, bool p_replace_previous = false);
 	bool _check_display_message(LogMessage &p_message);
+	String _replace_color(const String &p_color) const;
+	String _replace_bbcode_colors(const String &p_string) const;
 
 	void _set_filter_active(bool p_active, MessageType p_message_type);
 	void _set_search_visible(bool p_visible);

editor/themes/editor_theme_manager.cpp

@@ -433,11 +433,17 @@ void EditorThemeManager::_create_shared_styles(const Ref<EditorTheme> &p_theme,
 		p_config.success_color = Color(0.45, 0.95, 0.5);
 		p_config.warning_color = Color(1, 0.87, 0.4);
 		p_config.error_color = Color(1, 0.47, 0.42);
+		p_config.blue_color = Color(0.44, 0.67, 0.98);
+		p_config.magenta_color = Color(0.98, 0.44, 0.98);
+		p_config.cyan_color = Color(0.37, 0.98, 0.98);
 		if (!p_config.dark_theme) {
 			// Darken some colors to be readable on a light background.
 			p_config.success_color = p_config.success_color.lerp(p_config.mono_color, 0.35);
 			p_config.warning_color = Color(0.82, 0.56, 0.1);
 			p_config.error_color = Color(0.8, 0.22, 0.22);
+			p_config.blue_color = p_config.blue_color.lerp(p_config.mono_color, 0.35);
+			p_config.magenta_color = p_config.magenta_color.lerp(p_config.mono_color, 0.3);
+			p_config.cyan_color = p_config.cyan_color.lerp(p_config.mono_color, 0.35);
 		}
 
 		p_theme->set_color("mono_color", EditorStringName(Editor), p_config.mono_color);
@@ -2182,6 +2188,16 @@ void EditorThemeManager::_populate_editor_styles(const Ref<EditorTheme> &p_theme
 		p_theme->set_color("warning_color", "EditorProperty", p_config.warning_color);
 		p_theme->set_color("readonly_warning_color", "EditorProperty", readonly_warning_color);
 
+		// Used to color `print_rich()` usage with basic RichTextLabel colors in the editor log.
+		// NOTE: These color names are non-semantic. Only use these generic colors if no specific
+		// color suits your use case (such as `error_color`).
+		p_theme->set_color("red_color", "Editor", p_config.error_color);
+		p_theme->set_color("green_color", "Editor", p_config.success_color);
+		p_theme->set_color("yellow_color", "Editor", p_config.warning_color);
+		p_theme->set_color("blue_color", "Editor", p_config.blue_color);
+		p_theme->set_color("magenta_color", "Editor", p_config.magenta_color);
+		p_theme->set_color("cyan_color", "Editor", p_config.cyan_color);
+
 		Ref<StyleBoxFlat> style_property_group_note = p_config.base_style->duplicate();
 		Color property_group_note_color = p_config.accent_color;
 		property_group_note_color.a = 0.1;

editor/themes/editor_theme_manager.h

@@ -100,6 +100,9 @@ class EditorThemeManager {
 		Color success_color;
 		Color warning_color;
 		Color error_color;
+		Color blue_color;
+		Color magenta_color;
+		Color cyan_color;
 		Color extra_border_color_1;
 		Color extra_border_color_2;