Even in the age of smartphones I still prefer to check the calendar on my computer and I’ve often been disappointed by the horrible default calendars that ship with some operating systems (e.g. macOS’s calendar accessible via its systray).
Fortunately for us, Emacs users, we always have access to a proper calendar regardless of our OS and desktop environment (if any) -
M-x calendar. By default it looks something like this:
Nothing fancy here, just a simple calendar that highlights the current date. You can easily jump to any date by pressing
o(it stands for
other) and go back to the current date by pressing
.. You can also use
>to move back and forward in chunks of 3 months (by default).
You might have noticed that the calendar by default assumes that the week starts on Sunday, although in many countries (Bulgaria included) it actually starts on Monday. You can easily change this:
(setq calendar-week-start-day 1)
0, Monday is
1and so on.
You can go a step further and localize the calendar like this:
;; everything's better in Bulgarian (setq calendar-day-name-array ["Неделя" "Понеделник" "Вторник" "Сряда" "Четвъртък" "Петък" "Събота"] calendar-day-abbrev-array ["Нд" "Пн" "Вт" "Ср" "Чт" "Пт" "Сб"] calendar-day-header-array ["Нд" "Пн" "Вт" "Ср" "Чт" "Пт" "Сб"] calendar-month-name-array ["Януари" "Февруари" "Март" "Април" "Май" "Юни" "Юли" "Август" "Септември" "Октомври" "Ноември" "Декември"])
If you already have the calendar open you’ll have to do
M-x calender-redrawto reflect the new settings.
Did you notice that the configuration uses Emacs Lisp arrays? They are so uncommon that I’m pretty sure most people don’t even know about their existence.
And here’s the final result:
There are many more things that you can with the calendar (e.g. configure there national holidays, leverage integrations with
org-modeand so on), but they are beyond the scope of this short intro. As usual I encourage all of you to share your favorite tips and tricks related to the calendar in the comments.
I hope you learning something useful today. Keep hacking!
Projectile, a popular project navigation and management package, has always supported multiple minibuffer completion frameworks (e.g.
selectrum, etc). A recent change of the default completion configuration caused a bit of confusion for Projectile’s users and inspired me to write this article.
Projectile, like almost all Emacs packages, is extremely minibuffer-centric - you’d typically get a bunch of options in the minibuffer (e.g. a list of project files) and you have to select one of them. Projectile takes care of calculating the things to show, but it delegates the actual job of presenting the things and making it easy to filter them and select something to some generic minibuffer selection/completion framework.1 Historically, Projectile defaulted to
ido-modeas its minibuffer completion framework for a couple of reasons:
- back in the day
idodidn’t have many alternatives
- I somewhat foolishly assumed that everyone preferred
idoover Emacs’s default minibuffer completion
At first this was hardcoded and eventually it was made configurable via the configuration variable
projectile-completion-system. The arrangement worked fine for a very long time, but there was always one big problem with it - the implicit assumption that you’d figure out that Projectile has such configuration and you’d tweak it to match whatever completion framework you’re using (e.g.
selectrum). Of course, it didn’t have to be this way - it would have been much better if Projectile just auto-detected what framework (if any) you’re using by default and used it as well.
That’s why we’ve added
autoas one of the potential values for
projectile-completion-systemand made it the default in Projectile 2.3. This, however, showed an interested problem that we didn’t foresee. Many people complained after the change that the nice minibuffer completion, they were getting for things like finding files, had disappeared, and Projectile was broken for them. As some of you probably realize, it wasn’t that Projectile was broken - what was actually happening was that it had reverted to using Emacs’s default minibuffer completion for them (the one where you have to press
TABto get any results with). I had always assumed that everyone was using something like
selectrum, but clearly this was not the case. Turned out that a lot of people didn’t configure anything at all and for them Projectile was the only package doing “fancy” minibuffer completion. So, if you were affected by the change you can easily revert it by adding something like this to your Emacs config:
(setq projectile-completion-system 'ido)
Still, I think you’d do better if you just enabled some completion framework globally. For
idoyou can add something like this:
(use-package ido :config (setq ido-enable-flex-matching t) (ido-mode 1) (ido-ubiquitous-mode 1))
I, however, favor
selectrumthese days (mostly because I prefer the candidates to listed vertically):
(use-package selectrum :ensure t :config (selectrum-mode +1)) (use-package selectrum-prescient :ensure t :config (selectrum-prescient-mode +1) (prescient-persist-mode +1))
Of course, there’s nothing preventing you from using a different minibuffer completion framework with Projectile and the rest of Emacs, but such a setup seems pretty weird to me. I wonder if any of my reasons are using it and why. Projectile’s completion options are documented here in more details.
That’s all I have for you today. I do hope that the takeaways from this brief articles are clear - be careful with your assumptions, and there’s a configuration option for everything in Projectile. Keep hacking!
I’ll refer to those as “completion frameworks” for short. ↩
- back in the day
Today we’re going back to the basics.
I assume most of you know that you can run a shell within Emacs using
shell-modeor even a terminal (e.g.
vterm). While those are super useful there’s a simpler and faster way to run the occasional shell command via the aptly named command
You can invoke
M-!and you’ll get a minibuffer prompt asking you for the command to run. Type something like
ls -land you’ll the
lscommand’s output straight in your minibuffer. Simple and sweet!
If the command you type ends in
&, it will be executed asynchronously and the output will appear in a dedicated buffer (
*Async Shell Command*). This is useful for commands that are going to take a while to complete. There’s also the command
M-&) that always runs shell command asynchronously.
A cool trick with
shell-commandis to run it with a prefix (
C-u M-!) - when you do this the output from the shell command is going to be inserted at point.
One important thing to keep in mind is that the shell command will be executed in the directory (
default-directory) of the current buffer. If your current buffer has a remote directory (you’re using TRAMP), the shell command is executed on that remote host. Depending on your perspective that’s either a very useful feature or a somewhat undesirable one.
I have to admit that I use these commands quite rarely, but they are still useful from time to time when I want to check something really quick without switching buffers.
As a reminder - you can also evaluate Emacs Lisp code in the minibuffer.
That’s all I have for you today. Keep hacking!
How do most people delete local or remote git branches? Well, it’s quite simple actually:
- Google for “how to delete (remote) git branch”
- Find the wildly popular StackOverflow topic on the subject
- Pick one of the options outlined there
Some people would claim that they actually know how to delete git branches, but I’m convinced they are all liars! Anyways, most people end up doing one of the following:
# delete a local branch $ git branch -d branch_name $ git branch -D branch_name # delete a remote branch $ git push -d origin <branch_name>
This obviously gets the job done, but we’re Emacs users and we have more convenient options at our disposal. With Magit the process is as simple as:
- Open the Magit status buffer (
yto get a listing of all branches and tags in the git repo
- Navigate to the branch you want to delete and press
That’s it! As a bonus you can select multiple branches using a region (press
C-SPCand start moving around to select several branches) and you can remove them all at once! You’ll get prompted to confirm the deletion, so there’s nothing to be afraid of if you want to try this out. Note, however, that Magit does not support marking non-consecutive branches (something that
diredallows you to do for files and directories).
Here’s how this functionality looks:
Notice that I’ve selected 4 branches and I can delete them by pressing
kat this point.
With that newly acquired knowledge you’ve got no excuse to keep around obsolete branches, so get wild and clean up those messy git repos of yours! That’s all I have for you today! Keep hacking!
I hope by now most of you know (and use) the 3 default global Magit keybindings:
Typically you’d add to them
C-c g, as a more convenient alternative of
So far, so good. Now you can invoke a lot of commands with keybindings like
C-x g l lor
C-c g b, which is not bad as far as Emacs keybindings go. Remembering when to use
C-c gtakes a bit of practice, but it’s not very hard.
But what if you wanted to have a lot of Magit commands under a single two-key (super convenient) prefix? Such prefixes are tight in Emacs these days, but only if we’re talking about the commonly used prefixes based on
C-x). If you’re not a traditionalist you can try something different - use a prefix based on the rarely utilized in Emacs
Superkey.3 Here’s one such idea using the
m, of course, stands for Magit4):
;; essentials (global-set-key (kbd "s-m m") 'magit-status) (global-set-key (kbd "s-m j") 'magit-dispatch) (global-set-key (kbd "s-m k") 'magit-file-dispatch) ;; a faster way to invoke very common commands (global-set-key (kbd "s-m l") 'magit-log-buffer-file) (global-set-key (kbd "s-m b") 'magit-blame) ;; or alternatively (use-package magit :ensure t :bind (("s-m m" . magit-status) ("s-m j" . magit-dispatch) ("s-m k" . magit-file-dispatch) ("s-m l" . magit-log-buffer-file) ("s-m b" . magit-blame)))
Not only are all essential Magit commands under a single mnemonic (
s-m) right now, but you can also bind some “internal” commands that you’d normally invoke via
magit-file-dispatchdirectly under this prefix. This makes it slightly more efficient to invoke frequently used commands.
The suggested keys
kare clustered together on a typical QWERTY keyboard which makes it super easy to press them in sequence. Of course, you can find many other comfortable options.
One thing that you should keep in mind is that your mileage with
Superkeybindings will vary based on your operating system/desktop environment. Windows, for instance, uses
Win + letterkeybindings a lot, so
s-mis not an option there (it minimizes the current window). Frankly, I’m not sure if any
Win + letterkeybindings are available there at all.5 On macOS and Linux, however, such keybindings work fairly well, unless you happen to be using a window manager that’s fond of them (e.g. exwm).
I first adopted the use of
Superseveral years ago, but I never promoted it enough, apart from including a few such keybindings in Emacs Prelude. While the examples I gave today are with Magit, you can leverage the super keybindings with any package - e.g. I’ve long favored the use of
s-pfor Projectile and bindings like
That’s all I have for you today. Super-X forever!
In the sense of using the Super key. Although I guess one can argue that they are also super convenient. ↩
Typically this is the
Windowskey on PC keyboards and the
Commandkey on Mac keyboards. ↩
I sometimes wonder how the default keybindings for Magit ended up the letter “g” instead of “m”. It’s either a reference to Git, or that “g” happens to be on the home row. Or both. ↩