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Date: Wed, 27 Jan 2021 11:41:34 +0530
From: k3tu0isui@HIDDEN
To: progscriptclone@HIDDEN
Subject: #46003: should this be a bug?
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Is it a requirement for a buffer in a inferior-mode to always have a
process?
When you call run-prolog or prolog-consult-buffer, if a prolog process
is not running, a *prolog* buffer is created, prolog-inferior-mode is
activated in the buffer and THEN the process itself is run. Relevant code
from prolog-ensure-process function.
(with-current-buffer (get-buffer-create "*prolog*")
(prolog-inferior-mode)
...
(apply 'make-comint-in-buffer "prolog" (current-buffer)
(prolog-program-name) nil (prolog-program-switches)))
I assume this was required because (prolog-inferior-mode) sets up the
variables required for (prolog-program-name) and (prolog-program-switches).
If the relevant variables are inherited from the buffer from which run-prolog is
called then, this bug fix[1] will remove this dependency and prolog-inferior-mode
can be activated after the process is created.
[1]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45795
bug-gnu-emacs@HIDDEN:bug#46003; Package emacs.
Full text available.
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To: bug-gnu-emacs@HIDDEN
From: Tim Lee <progscriptclone@HIDDEN>
Subject: prolog-mode: inferior prolog process not available when
prolog-inferior-mode-hook is run
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I am using prolog-mode in Emacs 25.2. The following code shows that the
inferior prolog process is not available when prolog-inferior-mode-hook
is run:
(add-hook 'prolog-inferior-mode-hook
(lambda ()
(unless (get-buffer-process (current-buffer))
(warn "NO PROCESS!"))))
When I have above in my ~/.emacs, and when I start the Prolog REPL using
M-x run-prolog, the warning "NO PROCESS!" will appear, showing that the
inferior prolog process in not available when the hook is run.
I don't get this problem with the inferior mode hooks of other
programming languages (e.g. inferior-python-mode-hook,
inferior-lisp-mode-hook, inferior-scheme-mode-hook, etc.); their process
is available when their hook is run. I assume that there is problem with
prolog-mode.
Tim Lee <progscriptclone@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#46003; Package emacs.
Full text available.
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