[PATCH 1/2] emacs: Refactor subprocess stderr propagation
Tomi Ollila
tomi.ollila at iki.fi
Sat Aug 19 11:45:37 PDT 2017
On Thu, Aug 17 2017, Vladimir Panteleev wrote:
> Load subprocess error output to a string in the callers, and propagate
> the error messages as a string parameter instead of a path to file
> names.
>
> Required to be able to avoid using temporary files for subprocess
> error output.
>
> * notmuch-lib.el: Update notmuch-check-async-exit-status,
> notmuch-check-exit-status: accept an err parameter instead of
> err-file; shift the responsibility of loading error messages from
> files up the call stack.
both changes Look Good To Me, and works on emacs 25.2
(changed notmuch-command to "git" and saw error buffer populated as
expected, then M-x debug-on-entry make-process to verify that make-process
is actually called)
Tomi
> ---
> emacs/notmuch-lib.el | 47 ++++++++++++++++++++++++++---------------------
> 1 file changed, 26 insertions(+), 21 deletions(-)
>
> diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
> index 337b20ac..1f743eff 100644
> --- a/emacs/notmuch-lib.el
> +++ b/emacs/notmuch-lib.el
> @@ -768,23 +768,23 @@ signaled error. This function does not return."
> (error "%s" (concat msg (when extra
> " (see *Notmuch errors* for more details)"))))
>
> -(defun notmuch-check-async-exit-status (proc msg &optional command err-file)
> +(defun notmuch-check-async-exit-status (proc msg &optional command err)
> "If PROC exited abnormally, pop up an error buffer and signal an error.
>
> This is a wrapper around `notmuch-check-exit-status' for
> asynchronous process sentinels. PROC and MSG must be the
> -arguments passed to the sentinel. COMMAND and ERR-FILE, if
> -provided, are passed to `notmuch-check-exit-status'. If COMMAND
> -is not provided, it is taken from `process-command'."
> +arguments passed to the sentinel. COMMAND and ERR, if provided,
> +are passed to `notmuch-check-exit-status'. If COMMAND is not
> +provided, it is taken from `process-command'."
> (let ((exit-status
> (case (process-status proc)
> ((exit) (process-exit-status proc))
> ((signal) msg))))
> (when exit-status
> (notmuch-check-exit-status exit-status (or command (process-command proc))
> - nil err-file))))
> + nil err))))
>
> -(defun notmuch-check-exit-status (exit-status command &optional output err-file)
> +(defun notmuch-check-exit-status (exit-status command &optional output err)
> "If EXIT-STATUS is non-zero, pop up an error buffer and signal an error.
>
> If EXIT-STATUS is non-zero, pop up a notmuch error buffer
> @@ -793,9 +793,9 @@ be a number indicating the exit status code of a process or a
> string describing the signal that terminated the process (such as
> returned by `call-process'). COMMAND must be a list giving the
> command and its arguments. OUTPUT, if provided, is a string
> -giving the output of command. ERR-FILE, if provided, is the name
> -of a file containing the error output of command. OUTPUT and the
> -contents of ERR-FILE will be included in the error message."
> +giving the output of command. ERR, if provided, is the error
> +output of command. OUTPUT and ERR will be included in the error
> +message."
>
> (cond
> ((eq exit-status 0) t)
> @@ -808,12 +808,7 @@ You may need to restart Emacs or upgrade your notmuch Emacs package."))
> Emacs requested a newer output format than supported by the notmuch CLI.
> You may need to restart Emacs or upgrade your notmuch package."))
> (t
> - (let* ((err (when err-file
> - (with-temp-buffer
> - (insert-file-contents err-file)
> - (unless (eobp)
> - (buffer-string)))))
> - (command-string
> + (let* ((command-string
> (mapconcat (lambda (arg)
> (shell-quote-argument
> (cond ((stringp arg) arg)
> @@ -889,9 +884,13 @@ error."
> (with-temp-buffer
> (let ((err-file (make-temp-file "nmerr")))
> (unwind-protect
> - (let ((status (notmuch-call-notmuch--helper (list t err-file) args)))
> + (let ((status (notmuch-call-notmuch--helper (list t err-file) args))
> + (err (with-temp-buffer
> + (insert-file-contents err-file)
> + (unless (eobp)
> + (buffer-string)))))
> (notmuch-check-exit-status status (cons notmuch-command args)
> - (buffer-string) err-file)
> + (buffer-string) err)
> (goto-char (point-min))
> (read (current-buffer)))
> (delete-file err-file)))))
> @@ -931,9 +930,14 @@ status."
> proc))
>
> (defun notmuch-start-notmuch-sentinel (proc event)
> - (let ((err-file (process-get proc 'err-file))
> - (sub-sentinel (process-get proc 'sub-sentinel))
> - (real-command (process-get proc 'real-command)))
> + "Process sentinel function used by `notmuch-start-notmuch'."
> + (let* ((err-file (process-get proc 'err-file))
> + (err (with-temp-buffer
> + (insert-file-contents err-file)
> + (unless (eobp)
> + (buffer-string))))
> + (sub-sentinel (process-get proc 'sub-sentinel))
> + (real-command (process-get proc 'real-command)))
> (condition-case err
> (progn
> ;; Invoke the sub-sentinel, if any
> @@ -945,12 +949,13 @@ status."
> ;; and there's no point in telling the user that (but we
> ;; still check for and report stderr output below).
> (when (buffer-live-p (process-buffer proc))
> - (notmuch-check-async-exit-status proc event real-command err-file))
> + (notmuch-check-async-exit-status proc event real-command err))
> ;; If that didn't signal an error, then any error output was
> ;; really warning output. Show warnings, if any.
> (let ((warnings
> (with-temp-buffer
> (unless (= (second (insert-file-contents err-file)) 0)
> + (goto-char (point-min))
> (end-of-line)
> ;; Show first line; stuff remaining lines in the
> ;; errors buffer.
> --
> 2.13.3
>
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