Re: [Matlab-emacs-discuss] completion and goto-function in matlab-mode (Doom emacs)

[Eric L. <eri...@gm...>]

Hi Jonathan,

I tried using:

M-x matlab-shell RET
M-x company-mode RET

then @ matlab prompt:

 >> fo

M-x company-matlab-shell RET

to simulate what you have in your stack trace below.  I get a yellow 
popup with completions I expect in it.  I can pick one and it then 
inserts the completion correctly.

I tried this in Emacs 26.3 as installed by Ubuntu, and also 28.0.50 as 
downloaded from git yesterday morning.

I tend to run my Emacs as stock as possible so I don't accidentally 
create dependencies on random tools, so I'm not familiar with a more 
complex company mode setup.

Due to the nature of using MATLAB Shell, I recommend looking at the 
value of `comint-prompt-read-only' to see if that might be involved.  It 
is nil by default in my Emacsen, and matlab-shell doesn't set it because 
I do a lot of fiddling with the buffer in the background. If it were t, 
I would imagine a range of other things not working either though.

That's pretty much all I can think of. Sorry I can't be more helpful.  :(
Eric

On 1/6/21 5:50 AM, Jonathan Sahar wrote:
> Hi,
> I'm still getting the same error message with the updated version of 
> the repository...
> the stack trace I get is:
> ```
> Debugger entered--Lisp error: (error "Company: backend 
> company-matlab-shell error \"Text is read-only\" with args (prefix)")
>   signal(error ("Company: backend company-matlab-shell error \"Text is 
> read-only\" with args (prefix)"))
>   error("Company: backend %s error \"%s\" with args %s" 
> company-matlab-shell "Text is read-only" (prefix))
>   company-call-backend-raw(prefix)
>   apply(company-call-backend-raw prefix)
>   company--force-sync(company-call-backend-raw (prefix) 
> company-matlab-shell)
>   company-call-backend(prefix)
>   company--begin-new()
>   company--perform()
>   company-auto-begin()
>   company-manual-begin()
>   #f(compiled-function (backend &optional callback) "Start a 
> completion at point using BACKEND." (interactive #f(compiled-function 
> () #<bytecode 0x27b2831>)) #<bytecode 0x36c7e49>)(company-matlab-shell)
>   apply(#f(compiled-function (backend &optional callback) "Start a 
> completion at point using BACKEND." (interactive #f(compiled-function 
> () #<bytecode 0x29caa1d>)) #<bytecode 0x36c7e49>) company-matlab-shell)
>   company-begin-backend(company-matlab-shell)
>   company-matlab-shell(interactive)
>   funcall-interactively(company-matlab-shell interactive)
> ```
>
> and the output in the console is:
>
> ```
> >> emacsdocomplete('all')
>
> emacs_completions_output =
>
>   java.lang.String[]:
>
>     'all'
>     'allchild'
>     'allElectrodes'
>     'allfeasible'
>     'allMuPADNotebooks'
>
> ```
>
> which is the same output that I get by running  M-x 
> matlab-complete-symbol, if that helps to make sense of things.
>
> Thanks,
> Jonathan