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bug#35055: 27.0.50; async-shell-command truncates output lines

From: Michael Albinus
Subject: bug#35055: 27.0.50; async-shell-command truncates output lines
Date: Sun, 07 Apr 2019 09:32:18 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Juri Linkov <address@hidden> writes:

Hi Juri,

> I didn't know that set-process-window-size changes the
> value of COLUMNS.  I thought that COLUMNS is set only by
> comint-term-environment.

comint-term-environment doesn't set anything. It just returns env values
you could add to process-environmont, as in comint-exec-1 or compilation-start.

> One thing I still don't understand is
> how it would be possible to do the same for the remote process?

Well, don't know (yet), this needs more testing. At least, we could set
$COLUMNS directly:

(let ((default-directory "/ssh::")
      (process-environment (cons "COLUMNS=1024" process-environment)))
  (shell-command-to-string "ps aux"))

(let ((default-directory "/ssh::")
      (process-environment (cons "COLUMNS=1024" process-environment)))
  (shell-command-to-string "ps aux &"))

(let ((default-directory "/ssh::")
      (process-environment (cons "COLUMNS=1024" process-environment)))

Tramp could add the $COLUMNS setting by its own. Maybe, there exist a
more general solution, let's see.

If you add "COLUMNS=1024" to tramp-remote-process-environment, you would
get this effect already w/o any change in Tramp. Maybe I shall document
it somewhere in the Tramp manual.

Best regards, Michael.

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