If I press CTRL-x CTRL-c and exited the scratch buffer in Emacs, will everything I typed be gone?

Question

My Internet was not working, and while waiting it to go back up, I used Emacs to type some ideas first.

A few minutes later, the Internet was up, and I checked my Chrome browser, and it worked. So I will use Google Docs instead, I thought.

So I came back to Emacs and too quickly pressed CTRL-x CTRL-c, and Emacs exited without asking. Will everything I typed be gone forever?

I saw some way to make scratch persistent if we configure it, but it seems weird if Emacs actually will exit without asking and let the content be gone forever without warning.

Answer 1

@Harald answered your question.

But I would not say "unfortunately". This is by design. Buffer *scratch* is designed for what its name suggests and its initial contents describe: It is a scratchpad, for throwaway content.

If you use it for some other purpose then you are misusing it.

1. But of course you might want a scratchpad that is automatically backed up (autosaved) periodically. If so, then use a buffer that is backed by a file.

For example, edit your Lisp scratch in a new file buffer iii.el or whatever. Then (a) you can more easily save the content, if you want, and (b) Emacs will prompt you about any unsaved changes when you use C-x C-c.

In other words, Emacs does not prompt you about unsaved changes for *scratch* because it is not a buffer that is designed (intended, by default) to be saved. For that, use a file buffer, even for a not-yet-existing file.

With respect to autosaving, be aware that it happens only for an existing file, that is, a file on disk. So if you want autosaving to kick in then you must save the file buffer at least once.

2. If you want C-x C-c to ask for confirmation, that is easy to get. You could even have it let you know about modification of buffers, such as *scratch*.

This is what I use:

(add-hook 'kill-emacs-query-functions
          (lambda () (y-or-n-p "Do you really want to exit Emacs? "))
          'append)

That always prompts me, when I use C-x C-c, regardless of the state of any buffers. You might prefer something more specific, which checks certain buffers etc.

You can also use command customize-customized to check whether you have unsaved customizations.

Answer 2

The short answer is yes, unfortunately. But see this question for hints on avoiding this in the future.

Answer 3

Yes.

However, I would like to recommend an easy way of using emacs more efficiently.

First, you create emacs server: emacs --daemon

This makes emacs run as daemon(server mode), which means that you have one emacs server and you can have multiple clients.

Now when you open emacs(using emacsclient -t or emacsclient -c depending on console/GUI), you create new window(in emacs terminology you refer to it as a Frame). When you C-c C-x, you only close "Frame" - the client. The server is still running, so you can run another emacsclient, and you scratch will be the same as before.

The upside of this solution is that you start server once, and it's there in background; if you have many packages, Emacs can take few seconds to start. This solution makes starting an emacs client instantenous.

Warning

The above solution isn't perfect. It's good, it helps and fixes many problems, but one of Emacs's flaw is its design: it's single-threaded.

This means that some code that is executed might get stuck in an infinite loop. And this means you will be forced to kill the Emacs server and everything running there.