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[Octave-bug-tracker] [bug #37078] GUI mode should automatically fall bac

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #37078] GUI mode should automatically fall back to CLI mode if no X server
Date: Sat, 11 Aug 2012 21:44:27 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.75 Safari/537.1


                 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



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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