Irreal

A perennial problem for Emacs users are the yes/no prompts that require answering “yes” or “no” instead of just “y” or “n”. The usual solution—adopted by almost everyone—is to alias yes-or-no-p to y-or-n-p. Sometime around Emacs 28 or 29 the new variable use-short-answers was introduced as another way of solving the problem.

The last time I wrote about solving the yes-or-no-p problem, I said,

I’ve had my original aliasing code for at least 17 years and see no reason to change it. When use-short-answers was first introduced, I thought I should adopt it but I never did and as far as I can see, it doesn’t make any difference.

That statement was wrong in two ways. First, as related by Bozhidar Batsov, the alias trick doesn’t always work with native compilation because the call to yes-or-no-p may have been compiled before the alias is made. For that reason, use-short-answers is the better solution because it always work.

The second way it was wrong is that when I went to add use-short-answers to my init.el, I discovered that I had already done so, probably back in Emacs 29.

Bozhidar Batsov has a nice post on delete-pair. It’s almost a case of the Baader-Meinhoff Phenomenon. Five months ago—before I wrote about it—I’d never heard of delete-pair and now it’s popping up on Batsov’s blog. Batsov, himself, doesn’t remember hearing about it before either.

For those who came in late, delete-pair does just what it says on the tin: delete the delimiter at point and its matching closing sibling. It’s actually quite flexible and usable in surprising ways as you can see from the_cecep’s original post that inspired mine.

The delete-pair command came to Batsov’s attention because it interacted poorly with his Neocaml package. That turned out to be because delete-pair makes assumptions that might not hold for languages with unusual syntax.

Batsov’s post is mostly a summary of what he found from researching the deletions of pairs in Emacs. For Lisp languages, all you need is paredit which has multiple ways of removing a delimiter pair. Probably the easiest is paredit-splice-sexp.

There’s also smartparens that also has several ways of removing a delimiter pair and has the advantage of working in all languages, not just Lisps. Batsov finds it too heavyweight for his needs but lots of folks swear by it.

Finally, there’s the builtin electric-pair-mode, which keeps delimiters balanced, pairs nicely with delete-pair, and is probably all most people need.

Take a look at Batsov’s post for more details and for a bit of Elisp that recreates Vim’s vim-surround. I was glad to see his post because I was right on the verge of forgetting delete-pair even though I’ve assigned it a keyboard shortcut.

Just a quick post today to note that Protesilaos Stavrou (Prot) has published the video from his FOSS @ Oxford talk that I wrote about yesterday. Actually, he says that it’s a modified version of that talk so I don’t know if a video of the actual talk will appear or not.

In any event, the video tracked very well with the transcript that I wrote about in yesterday’s post. The video is a little easier to follow because you can see the changes to the text that he makes during his talk. If you’re the type of person that gets more out of a video than reading a transcript, be sure to take a look. The video is fairly long at 42 minutes, 40 seconds long so you’ll have to put some time aside for it but it’s definitely worth your while.

Protesilaos Stavrou (Prot) recently gave a talk to the FOSS @ Oxford event on the power of Emacs and why he uses it. The video for the talk is not yet available but he does have the transcript that he used for delivering the presentation.

It was a nice talk that explained why Prot believes Emacs is a tool that everyone using a computer should be familiar with and make use of. The TL;DR is that Emacs is extensible and can integrate all the (text-based) tasks you need to perform on your computer. If, as a trivial example, you develop a color and font style that is pleasing to you, you need only implement it once: Emacs will use it for whatever tasks you like. Non trivially, you can arrange for various tasks to communicate with each other and share information if they need to.

Prot stresses a point that Irreal has often made: You don’t have to be a programmer to make good use of Emacs. Writers, teachers, liberal arts academics, and many others can and do leverage Emacs to make their work easier. Of course, if you know a bit of Elisp it’s even better because you can extend Emacs to do whatever you need. Prot himself is not a programmer but he taught himself Elisp and is now a significant contributor to Emacs.

The takeaway from Prot’s talk is that Emacs is all about freedom. Freedom to make whatever changes you like, freedom to explore the source code and see how Emacs does things, and freedom to share with others and learn from them.

Take a look at the transcript or wait for the video if you prefer visual presentations. In either case, it’s well worth your time.

Code formatters. Many people swear by them and always run their code through a formatter before checking it in. I’ve never seen the need for them. I have strong feelings about code format and I always write my code to that format: no need for a separate formatter. At the same time, I recognize that others have strong feelings about their preferred format so I never want to reformat someone else’s code.

There are, in every organization, control freaks who think it critically important that everyone’s code look the same. I’ve never accepted that premise and have ignored formatting guidelines. Somehow, I’ve always managed to get away with that minor recalcitrance.

Still, some people appear to like code formatters and for those people, Bozhidar Batsov has an interesting post on code formatters and how to use them in Emacs. It turns out that there’s a plethora of formatters with slightly different behavior to choose from

Happily the Lisp languages—which I use almost exclusively these days—don’t really need one since for a Lisp, code formatting is really just a matter of indentation, which Emacs handles on its own. Other languages need more work.

One of the problems with code formatters run from within Emacs is that they can freeze Emacs while they run. This is the case of formatters that run before the file is saved. There are formatters that run after the save by asynchronously reading the saved file, reformatting it, and writing it back to disk. This has the small defect that an unformatted file exists on disk for a short while.

Batsov’s post covers reformatters implementing both methods. Some of them allow extensive configuration of the reformatting rules. Others enforce a fixed format. Take a look at Batsov’s post for a really good rundown of all the possibilities.

Those of you that hang out on Irreal know that I think highly of Charles Choi’s Casual Suite. It’s just what you need for modes that have a lot of seldom used commands or modes that themselves are seldom used. The idea is that rather than having to remember the appropriate key sequences or command names, you merely bring up a transient menu and choose the operation from it.

That’s a bit of a simplification since Casual is actually a bit more nuanced. Back in 2024, Choi produced a video for EmacsConf 2024—which someone has just reposted—that explores some of those nuances.

The use of Casual is not an either or decision. Often times you know many of the commands of a certain mode—Dired or Calc, say—but haven’t memorized the commands for some of the more obscure or little used commands. That’s where Casual really shines. For sequences or commands you don’t remember, you simply bring up the menu with a key sequence that is the same for all casual menus and use it to select the operation you need. If you already know the sequence, you just use it without bothering with Casual at all.

Choi has a user guide for Casual that documents the current state of Casual and shows you what modes are covered. That list has grown since his video.

For those of you who care about such things, Choi has just made the Casual Suite available on NonGnu Elpa as well as Melpa. Watch the video and see if Casual may not be a worthwhile addition to your Emacs packages repertoire.