From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Get current buffer name from command line?
Date: Wed, 13 Aug 2014 17:40:07 -0400 [thread overview]
Message-ID: <jwvd2c4m693.fsf-monnier+gmane.emacs.help@gnu.org> (raw)
In-Reply-To: 20140813224926.064de008@aga-netbook
> 1. So what exactly is "current-buffer"? Or, more precisely, why
> (progn (kill-buffer) (current-buffer))
> didn't work?
current-buffer is something that changes all the time for
internal reasons. E.g. while processing the request coming from
emacsclient, the current-buffer will be temporarily changed to the
*server* buffer. That has no influence on display.
It's simply that most operations that touch a buffer do it on the
current-buffer, so if you want to look at a buffer's content, or change
it, or consult some of its variables, the way you typically do it is by
temporarily changing current-buffer.
The same holds for manipulating windows, which is why selected-window
may not always return what you think (as a user) as "the selected
window" (e.g. it may get temporarily changed by process-filter handling
a subprocess's output).
> 2. Why "more often"? Is it possible that it won't? To be more
> precise on my requirements: I thought about writing a script (to be
> put into cron) which would gather data on what I'm doing at various
> times so that I can measure time spent on different activities. Since
> most of my computer time is spent in Emacs, this would be an important
> part of it. From the docstring of selected-window, it seems to be
> exactly what I'm looking for. Still, the words "more often" made me a
> bit suspicious;).
I think "emacsclient -e '(window-buffer (selected-window))'" will work
fine for your use case, but if you want to take idle time into account,
you might like to use a post-command-hook which sets a global var to the
"current time after last command" at which point you could also set
a global var to "the selected-window after last command" which should be
more reliable.
Stefan
next prev parent reply other threads:[~2014-08-13 21:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 11:32 Get current buffer name from command line? Marcin Borkowski
2014-08-13 12:23 ` Stefan Monnier
2014-08-13 20:49 ` Marcin Borkowski
2014-08-13 21:40 ` Stefan Monnier [this message]
2014-08-13 22:08 ` Marcin Borkowski
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