Make chat web links clickable (#11092)

If enabled in minetest.conf, provides colored, clickable (middle-mouse or ctrl-left-mouse) weblinks in chat output, to open the OS' default web browser.

src/gui/guiChatConsole.cpp

@@ -41,6 +41,10 @@ inline u32 clamp_u8(s32 value)
 	return (u32) MYMIN(MYMAX(value, 0), 255);
 }
 
+inline bool isInCtrlKeys(const irr::EKEY_CODE& kc)
+{
+	return kc == KEY_LCONTROL || kc == KEY_RCONTROL || kc == KEY_CONTROL;
+}
 
 GUIChatConsole::GUIChatConsole(
 		gui::IGUIEnvironment* env,
@@ -91,6 +95,10 @@ GUIChatConsole::GUIChatConsole(
 
 	// set default cursor options
 	setCursor(true, true, 2.0, 0.1);
+
+	// track ctrl keys for mouse event
+	m_is_ctrl_down = false;
+	m_cache_clickable_chat_weblinks = g_settings->getBool("clickable_chat_weblinks");
 }
 
 GUIChatConsole::~GUIChatConsole()
@@ -405,8 +413,21 @@ bool GUIChatConsole::OnEvent(const SEvent& event)
 
 	ChatPrompt &prompt = m_chat_backend->getPrompt();
 
-	if(event.EventType == EET_KEY_INPUT_EVENT && event.KeyInput.PressedDown)
+	if (event.EventType == EET_KEY_INPUT_EVENT && !event.KeyInput.PressedDown)
 	{
+		// CTRL up
+		if (isInCtrlKeys(event.KeyInput.Key))
+		{
+			m_is_ctrl_down = false;
+		}
+	}
+	else if(event.EventType == EET_KEY_INPUT_EVENT && event.KeyInput.PressedDown)
+	{
+		// CTRL down
+		if (isInCtrlKeys(event.KeyInput.Key)) {
+			m_is_ctrl_down = true;
+		}
+
 		// Key input
 		if (KeyPress(event.KeyInput) == getKeySetting("keymap_console")) {
 			closeConsole();
@@ -613,11 +634,24 @@ bool GUIChatConsole::OnEvent(const SEvent& event)
 	}
 	else if(event.EventType == EET_MOUSE_INPUT_EVENT)
 	{
-		if(event.MouseInput.Event == EMIE_MOUSE_WHEEL)
+		if (event.MouseInput.Event == EMIE_MOUSE_WHEEL)
 		{
 			s32 rows = myround(-3.0 * event.MouseInput.Wheel);
 			m_chat_backend->scroll(rows);
 		}
+		// Middle click or ctrl-click opens weblink, if enabled in config
+		else if(m_cache_clickable_chat_weblinks && (
+				event.MouseInput.Event == EMIE_MMOUSE_PRESSED_DOWN ||
+				(event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN && m_is_ctrl_down)
+				))
+		{
+			// If clicked within console output region
+			if (event.MouseInput.Y / m_fontsize.Y < (m_height / m_fontsize.Y) - 1 )
+			{
+				// Translate pixel position to font position
+				middleClick(event.MouseInput.X / m_fontsize.X, event.MouseInput.Y / m_fontsize.Y);
+			}
+		}
 	}
 #if (IRRLICHT_VERSION_MT_REVISION >= 2)
 	else if(event.EventType == EET_STRING_INPUT_EVENT)
@@ -640,3 +674,63 @@ void GUIChatConsole::setVisible(bool visible)
 	}
 }
 
+void GUIChatConsole::middleClick(s32 col, s32 row)
+{
+	// Prevent accidental rapid clicking
+	static u64 s_oldtime = 0;
+	u64 newtime = porting::getTimeMs();
+
+	// 0.6 seconds should suffice
+	if (newtime - s_oldtime < 600)
+		return;
+	s_oldtime = newtime;
+
+	const std::vector<ChatFormattedFragment> &
+			frags = m_chat_backend->getConsoleBuffer().getFormattedLine(row).fragments;
+	std::string weblink = ""; // from frag meta
+
+	// Identify targetted fragment, if exists
+	int indx = frags.size() - 1;
+	if (indx < 0) {
+		// Invalid row, frags is empty
+		return;
+	}
+	// Scan from right to left, offset by 1 font space because left margin
+	while (indx > -1 && (u32)col < frags[indx].column + 1) {
+		--indx;
+	}
+	if (indx > -1) {
+		weblink = frags[indx].weblink;
+		// Note if(indx < 0) then a frag somehow had a corrupt column field
+	}
+
+	/*
+	// Debug help. Please keep this in case adjustments are made later.
+	std::string ws;
+	ws = "Middleclick: (" + std::to_string(col) + ',' + std::to_string(row) + ')' + " frags:";
+	// show all frags <position>(<length>) for the clicked row
+	for (u32 i=0;i<frags.size();++i) {
+		if (indx == int(i))
+			// tag the actual clicked frag
+			ws += '*';
+		ws += std::to_string(frags.at(i).column) + '('
+			+ std::to_string(frags.at(i).text.size()) + "),";
+	}
+	actionstream << ws << std::endl;
+	*/
+
+	// User notification
+	if (weblink.size() != 0) {
+		std::ostringstream msg;
+		msg << " * ";
+		if (porting::open_url(weblink)) {
+			msg << gettext("Opening webpage");
+		}
+		else {
+			msg << gettext("Failed to open webpage");
+		}
+		msg << " '" << weblink << "'";
+		msg.flush();
+		m_chat_backend->addUnparsedMessage(utf8_to_wide(msg.str()));
+	}
+}