[Octave-bug-tracker] [bug #37078] GUI mode should automatically fall back to CLI mode if no X server

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?37078>

                 Summary: GUI mode should automatically fall back to CLI mode
if no X server
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Sat 11 Aug 2012 05:44:27 PM EDT
                Category: GUI
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

The newly unified octave+gui executable exits with an error if it cannot
connect to X or if DISPLAY is unset, e.g. over SSH without X forwarded.


warning: X11 DISPLAY environment variable not set
octave: cannot connect to X server 


The error is internal to Qt and I don't think there's a way to detect the
condition, Qt just exits immediately (*love* it when library code chooses to
exit for me).

Ideally, if the user runs octave without specifying --force-gui or --no-gui,
it should detect whether it can connect to X first, and fall back to CLI mode
if not. Currently, user has to read the error, know what it means, and run
octave --no-gui.




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