The GtkRadiant sources as originally released under the GPL license.

radiant/url.cpp

@@ -0,0 +1,66 @@
+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "url.h"
+
+#include "mainframe.h"
+#include "gtkutil/messagebox.h"
+
+#ifdef WIN32
+#include <gdk/gdkwin32.h>
+#include <shellapi.h>
+bool open_url(const char* url)
+{
+  return ShellExecute( (HWND)GDK_WINDOW_HWND (GTK_WIDGET(MainFrame_getWindow())->window), "open", url, 0, 0, SW_SHOW ) > (HINSTANCE)32;
+}
+#endif
+
+#ifdef __linux__
+#include <stdlib.h>
+bool open_url(const char* url)
+{
+  // \todo FIXME: the way we open URLs on *nix should be improved. A script is good (see how I do on RTCW)
+  char command[2*PATH_MAX];
+  snprintf (command, sizeof(command), 
+            "netscape -remote \"openURL(%s,new-window)\" || netscape \"%s\" &", url, url);
+  return system(command) == 0;
+}
+#endif
+
+#ifdef __APPLE__
+#include <stdlib.h>
+bool open_url(const char* url)
+{
+  char command[2*PATH_MAX];
+  snprintf (command, sizeof(command), "open \"%s\" &", url);
+  return system(command) == 0;
+}
+#endif
+
+void OpenURL(const char *url)
+{
+  // let's put a little comment
+  globalOutputStream() << "OpenURL: " << url << "\n";
+  if(!open_url(url))
+  {
+    gtk_MessageBox(GTK_WIDGET(MainFrame_getWindow()), "Failed to launch browser!");
+  }
+}