From: Nic Ferrier <nferrier@ferrier.me.uk>
To: ueno@gnu.org
Cc: emacs-devel@gnu.org
Subject: Re: make-subprocess
Date: Fri, 26 Sep 2014 10:38:15 +0100 [thread overview]
Message-ID: <87a95md8mw.fsf@ferrier.me.uk> (raw)
In-Reply-To: <m3h9zupwg7.fsf-ueno@gnu.org> (ueno@gnu.org's message of "Fri, 26 Sep 2014 18:23:04 +0900")
ueno@gnu.org writes:
> Hello,
>
> An Elisp program communicating with a subprocess is typically written
> as:
>
> (let* ((process-connection-type nil)
> (process (start-process "cat" nil "cat" "/etc/motd")))
> (set-process-filter process #'my-filter)
> (set-process-sentinel process #'my-sentinel)
> ...)
>
> It is a bit tricky and error prone. On the other hand, Python and GLib
> provide a simple way to spawn and communicate with subprocess:
>
> http://legacy.python.org/dev/peps/pep-0324/
> https://developer.gnome.org/gio/unstable/GSubprocess.html
>
> So I would like to propose something similar:
>
> * Provide a function 'make-subprocess' similar to 'make-network-process'
> or 'make-serial-process', which can be used as:
>
> (make-subprocess :name "cat" :program "cat" :args '("/etc/motd")
> :filter #'my-filter :sentinel #'my-sentinel
> :coding '(utf-8 . utf-8))
>
> * Rewrite 'start-process' as an Elisp wrapper around 'make-subprocess'.
>
> This also has the following benefits:
>
> * We could collect stderr output naturally. 'make-subprocess' could
> have a keyword, say :error, to prepare a pipe for stderr when spawning
> a process.
>
> * Maybe it could share the same code to handle the standard keywords
> (:coding, :filter, :sentinel, etc.) with 'make-network-process' and
> 'make-serial-process'.
>
> What do people think? I'm attaching a patch as POC.
I like the idea. I've written several wrappers that do this myself.
What about make-network-process? that could be extended to take the same
sentinel and filter arguments.
I think your function should be called:
make-sub-process
to fit in with make-network-process.
I'd also like to have a:
set-default-sentintel
function which would make a particular sentinel the default if one was
not specified. Maybe make-sub-process and make-network-process could
have a default-sentinel variable that they consulted if a sentinel was
not specified?
Nic
next prev parent reply other threads:[~2014-09-26 9:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-26 9:23 make-subprocess Daiki Ueno
2014-09-26 9:38 ` Nic Ferrier [this message]
2014-09-26 12:42 ` make-subprocess Stefan Monnier
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