Irreal

Once again, as is occasionally the happens, I’ve stumbled across an Emacs user who discovered that some Emacs keybindings work in macOS. This user, sudeenhux, realized that he could navigate in the Apple Mail app with the normal Emacs bindings. He had no idea what was going on and took to reddit to ask what he had done to enable this. When reddit told him this was built in to macOS and worked with all macOS applications, he was overjoyed.

The thing is, of course, that what sudeenhux discovered is only half the story. As I’ve reported many times before—most recently here—macOS lets you configure your own bindings for its navigation commands. That would be a pain if you had to do it piecemeal but the way it works is that you put the bindings in a file and everything happens automatically. Even better, someone has already done the hard part and produced the file so all you have to do is download it and install it in the proper place. All the details are in the above link.

As a bonus, I recently got tired of not having Ctrl+Delete work in all macOS apps so I added an entry to enable it. That shows how easy it is to add your own bindings, assuming, of course, that macOS has a command that supports it.

I’m always surprised that so many people don’t know this so I like to remind everyone once in a while. Some of you may be tired of hearing about it but to those who don’t already know, it’s a revelation.

Emacs view mode is one of things that might seem superfluous at first glance. After all, you can always just visit a file and use the normal navigation commands to view the file. But there’s a lot to be said for a read-only file viewer—think less, more, or other pager utilities—that let’s you page through the file without worrying about accidentally introducing a change.

The normal view mode protocol is to use Space and Delete to scroll forward and backward like Ctrl+v and Meta+v do. It’s a nice and convenient way of viewing a file that you don’t want to edit.

Charles Choi agrees with all that but wants a richer protocol. For instance, if he’s in an Org file, he’d like the movement to be forward and backward to the next heading. Once you make that leap, you realize that other file types could also benefit from specialized navigation commands. He has a post that explores the idea of file type naviation in view mode.

He presents some code to do this for several file types and it would be no problem to add other file types as well. Even if you don’t know Elisp, it would be easy to follow the cases he presents to add your own.

View mode is an underused feature of Emacs and Choi’s enhancements make it even better. Take a look at his post and see if you don’t agree.

If you’re an even moderately experienced Emacs user, you probably know about batch mode. You can write a file with some Emacs commands and run it either by calling Emacs on the command line with a --script parameter pointing to the file or by adding at #! line to the top of the script and running it by calling the script directly.

Emacs Elements has a short video on batch mode that describes a use case I hadn’t seen before. The video is only 5 minutes, 45 seconds so you can watch it to get the details but the TL;DR is that you can use batch mode to check a changed init.el file for errors.

The idea is that you use batch mode to load the modified init.el file. If there are any errors, you get notified but your active Emacs instance is still operable. It’s preferable to just restarting Emacs because if there’s a disabling error, you still have a working Emacs to correct it. Sure, you could always restart Emacs with a -q or -Q option but then you don’t really have a fully operational Emacs to work with. That happens to me a lot when I have an error in my init.el. I can get by, of course, but it’s a pain. With Emacs Elements’ method you still have your familiar and comfortable working environment available.

It’s often said of Emacs that it includes everything including the kitchen sink. Indeed, there’s even an Emacs logo reflecting this sensibility. I don’t know if it was ever an official logo but its use is widespread. Still, it would be easy to dismiss the notion as a bit of Emacs fanboy hyperbole.

Gopar has a short video that provides compelling evidence that Emacs does, indeed, include the kitchen sink and everything else. The video demonstrates two builtin functions. To say that they are obscure and little used would be an award winning understatement.

The first is a function that translates to and from Morse code. Just in case you want to know what “Emacs is amazing” looks in More code, Emacs has you covered:

./--/.-/-.-./... ../... .-/--/.-/--../../-./--.

The second functionality is to render text in the phonetic alphabet. I’m familiar with this from my pilot days, where it can increase clarity in radio communications, but didn’t expect to find it in Emacs core. If you want to know how to spell Emacs in the phonetic alphabet, here you go:

Echo-Mike-Alfa-Charlie-Sierra

Emacs calls this the “NATO alphabet”. I’ve never heard it called that before but whatever you call it, Emacs can render text into it and, of course, go in the other direction as well.

Again, these functions are builtin, not packages. They make the current agonizing over whether or not to add actually useful functionality to Emacs core look positively silly.

Mike Zamansky has popped in with another Learning Elisp video before he departs on his vacation. He didn’t want to start the next project and leave it hanging while he was away so this video covers some preliminaries. In particular, he covers some Elisp builtin data structures. That includes lists, pairs, vectors, hash tables, and association lists.

Vectors and hash tables have direct analogs in other languages and are probably familiar to all Irreal readers. Lists are simply linked lists and although they don’t have a builtin analog in most other languages, the idea is a common and familiar.

Zamansky explains how lists and pairs (single, unlinked cons cells) are implemented and then goes on to discuss the data structure that he’s planning to use in the next project: association lists. They’re sort of an intermediate structure, a bit like hash tables but lighter weight and not as fast. They’re the ideal key/value lookup method for small tables. It’s \(O(n)\) instead of the \(O(1)\) that hash tables provide but it’s perfect for relatively small lookup tables.

The next project is going to be about inserting emoji into a buffer and Zamansky is planning on using an association list to map the emoji name to the actual symbol. We’ll have to wait until Zamansky gets back from Europe for that but we can consider this video a teaser.

The video is 16 minutes, 16 seconds long so plan accordingly.

As many of you know, I’m very interested in the use of Emacs for non-technical purposes. In particular, I interested in how prose writers and researchers in disciplines other than Computer Science and its close siblings use Emacs for their writing.

Peter Prevos has written a lot about using Emacs for writing and he’s gathered these posts together into an Emacs Writing Studio section on his blog. As Prevos puts it, “The Emacs Writing Studio configuration shows how to use Emacs to conduct research, write your prose and publish your text as an article, (e)book, or website.”

It’s an excellent resource conveniently broken into small easy-to-read articles. There are 28 articles—although some of them are only peripherally about writing. The other aspect of the Emacs Writing Studio is that it includes a downloadable configuration to get the n00b started using Emacs for writing.

In the reddit article about the Emacs Writing Studio, Alphapapa provides a link to his own collection of articles on using Emacs for writing that’s also worth taking a look at.

In his first article, Prevos notes that the right way to approach Emacs is to learn just enough to get started and then learn other details as they become necessary. As even moderately experienced Emacs users know, it’s a fool’s errand to try to learn everything about Emacs up front. Prevos suggests the same incremental approach that Irreal and others have recommended for Org mode.

If your principal activity is writing prose, you should take a look at Prevos’ site. It is, as I say, a nice resource.

UPDATE [2023-09-19 Tue 14:31]: Alphapappa → Alphapapa.