Running (main) only shows "... QWidget DELETED"

[vindarel]

Hello, I installed Qtools and its dependencies today, I tried to run the examples both from the documentation and from the repository. (installing and compiling some code can't be easier, that's really nice.) Running for example (qtools-helloworld:main) only shows

#<QTOOLS-HELLOWORLD:MAIN QWidget DELETED> ;; deleted ?

and nothing happens. Same with the other examples and the code snippets from the doc.

I didn't see error messages while compiling, only warnings

Implicitly creating new generic function

Any hints ? Thanks.

[Shinmera]

What OS is this?

[phoe]

What do you see in the *inferior-lisp* buffer?

What you see in the REPL is normal; each window is deleted by the time it reaches the REPL to be printed, because the REPL only takes control when Qt quits. Don't mind the "implicitly creating new generic function" warnings either. I'm more puzzled by why the window does not even show, even though it should.

[vindarel]

Oh, had forgotten *inferior-lisp*. This is all of it:

(progn (load "/home/vince/quicklisp/dists/quicklisp/software/slime-v2.20/swank-loader.lisp" :verbose t) (funcall (read-from-string "swank-loader:init")) (funcall (read-from-string "swank:start-server") "/tmp/slime.25865"))

WARNING: Setting locale failed.
  Check the following variables for correct values:
  LC_CTYPE=en_US.UTF-8
  LANG=fr_FR.UTF-8
This is SBCL 1.3.19, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
* 
; loading #P"/home/vince/quicklisp/dists/quicklisp/software/slime-v2.20/swank-loader.lisp"
WARNING:
   redefining EMACS-INSPECT (#<SB-PCL:SYSTEM-CLASS COMMON-LISP:T>) in DEFMETHOD
;; Swank started at port: 44008.
44008
* WARNING:
   redefining THREAD-FOR-EVALUATION (#<STRUCTURE-CLASS SWANK::MULTITHREADED-CONNECTION>
                                     #<SB-MOP:EQL-SPECIALIZER :FIND-EXISTING>) in DEFMETHOD
QApplication::exec: Must be called from the main thread
QApplication::exec: Must be called from the main thread
QApplication::exec: Must be called from the main thread
QApplication::exec: Must be called from the main thread
QApplication::exec: Must be called from the main thread
QApplication::exec: Must be called from the main thread

On Debian (LMDE).

[Shinmera]

It seems like you were calling exec multiple times from different threads. Try not using C-c C-c to evaluate things, or running on a bare SBCL first before using Slime.

[vindarel]

It works well on a bare SBCL (sbcli is better than rlwrap sbcl :) ).

Do you have recommendations to develop with Slime then ?

[Shinmera]

Not using C-c C-c or anything that spawns background threads to load or run the code.

[vindarel]

That seems a regression of the workflow O_o What commands can we use instead ?

[Shinmera]

Just load the system from the REPL and run it from there too. Using C-c C-c to compile in definition changes after the initial load works just fine.

[vindarel]

Ok thanks !

[phoe]

That seems a regression of the workflow O_o

That is a limitation of Qt itself - you may only spawn the application in the main thread.

[vindarel]

ok. Maybe having a qtools-slime-mode.el that does the right thing with C-c C-c would be possible. I'll get some experience with Qt[ools] first :)

[phoe]

Such a plugin would need to detect that it is about to run Qtools code and would need to send it into the REPL for evaluation instead of spawning a Swank compilation thread. Doable, but tricky.