HandlerPageView: Add [cmd:pagetitle] to set custom per-page titles

handlers/handlerpageview.cpp

@@ -167,6 +167,7 @@ Response HandlerPageView::handleRequest(PageDao &pageDao, std::string pagename,
 		}
 	}
 	std::string revisionstr = std::to_string(revision->revision);
+	std::string customtitle = parser.extractCommand("pagetitle", revision->content);
 	page.setVar("content", parsedcontent);
 	page.setVar("index", indexcontent);
 	page.setVar("editedby", revision->author);
@@ -174,6 +175,10 @@ Response HandlerPageView::handleRequest(PageDao &pageDao, std::string pagename,
 	page.setVar("historyurl", this->urlProvider->pageHistory(pagename));
 	page.setVar("revision", revisionstr);
 	setPageVars(page, pagename);
+	if(!customtitle.empty())
+	{
+		page.setVar("title", createPageTitle(customtitle));
+	}
 	std::string body = page.render();
 	if(revisionid == 0 && !this->userSession->loggedIn)
 	{