Windows port: ConPTY via ptyqt, POSIX guards

lib/Session.cpp

@@ -84,7 +84,11 @@ Session::Session(QObject* parent) :
 
     //create teletype for I/O with shell process
     _shellProcess = new Pty();
+#if !defined(Q_OS_WIN)
     ptySlaveFd = _shellProcess->pty()->slaveFd();
+#else
+    ptySlaveFd = -1;
+#endif
 
     //create emulation backend
     _emulation = new Vt102Emulation();
@@ -258,11 +262,15 @@ void Session::run()
      * their computing time on any system - especially with the problem on arch linux beeing there too.
      */
     QString exec = QString::fromLocal8Bit(QFile::encodeName(_program));
+#if defined(Q_OS_WIN)
+    if (exec.isEmpty()) {
+        exec = QString::fromLocal8Bit(qgetenv("COMSPEC"));
+        if (exec.isEmpty())
+            exec = QStringLiteral("cmd.exe");
+    }
+#else
     // if 'exec' is not specified, fall back to default shell.  if that
     // is not set then fall back to /bin/sh
-
-    // here we expect full path. If there is no fullpath let's expect it's
-    // a custom shell (eg. python, etc.) available in the PATH.
     if (exec.startsWith(QLatin1Char('/')) || exec.isEmpty())
     {
         const QString defaultShell{QLatin1String("/bin/sh")};
@@ -278,6 +286,7 @@ void Session::run()
             exec = defaultShell;
         }
     }
+#endif
 
     // _arguments sometimes contain ("") so isEmpty()
     // or count() does not work as expected...