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From: Augusto Stoffel <arstoffel@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.1; Deficiencies of the ~/.emacs_SHELLNAME mechanism
X-Debbugs-Cc: Michael Albinus <michael.albinus@HIDDEN>
Date: Fri, 02 Oct 2026 13:21:17 +0200
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Content preview: As discussed in a tangent of bug#81953,
the ~/.emacs_SHELLNAME
mechanism (info "(emacs) Interactive Shell") has some usability issues: -
Each line from that file are added to the command history, each time a shell
is started. - You can't change the first prompt using it. - Generally, it
relies on prompt detection, which is fragile.
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As discussed in a tangent of bug#81953, the ~/.emacs_SHELLNAME mechanism
(info "(emacs) Interactive Shell") has some usability issues:
- Each line from that file are added to the command history, each time a
shell is started.
- You can't change the first prompt using it.
- Generally, it relies on prompt detection, which is fragile.
Perhaps there's a better way to achieve the desired effect.
If we restrict to POSIX shells running over a PTY, then here's an idea:
--8<---------------cut here---------------start------------->8---
(defun shell-source-file (file)
(interactive "fSource file: ")
(when-let ((proc (get-buffer-process (current-buffer))))
(with-temp-buffer
(insert-file-contents file)
(process-send-string proc " printf '\\r' && . /dev/stdin\n")
(accept-process-output proc 1)
(process-send-region proc (point-min) (point-max))
(process-send-eof proc))))
(add-hook 'shell-mode-hook (lambda ()
(accept-process-output proc 1)
(shell-source-file "~/test.sh")))
--8<---------------cut here---------------end--------------->8---
If the above function worked without the two calls to
accept-process-output, then I'd say this would be a very clean trick.
On my machine, with Linux and bash, that actually is the case when bash
is running without readline.
If I enable readline by adding 'set +x emacs' to my ~/.bashrc, then (and
only then) the two calls to accept-process-output become necessary.
Unfortunately it's a race condition, not sure why and whether it can be
avoided.
Augusto Stoffel <arstoffel@HIDDEN>:michael.albinus@HIDDEN, bug-gnu-emacs@HIDDEN.
Full text available.michael.albinus@HIDDEN, bug-gnu-emacs@HIDDEN:bug#81973; Package emacs.
Full text available.
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