Nerd Fonts
has slowly become a standard for icon fonts on linux systems. If
you’ve ever riced your polybar and wanted to
have the same sick icons as your favorite linux youtuber have, you
have probably realized you have to download a nerd font. Furthermore,
it’s adopted in vim plugins,
and exa using the
--icons flag, and probably other places too.
Nerd Fonts work by patching existing fonts with their font patcher, and they kindly provide a set of pre-patched fonts on their GitHub release page. They use a bunch of different icon sets, like Material Design Icons, Font Awesome, and Devicon, to name the biggest ones. Then they combine these fonts with a font to be patched, and boom, you now have a Nerd Font.
My first experience with Nerd Fonts was when I was when I wanted to
rice my status bar with some sick icons for things like the CPU usage,
temperature, and battery percentage. Specifically, I wanted to have
the battery icon show the state of the battery. Fortunately, Nerd
Fonts have a two different battery series icons to chose from,
nf-fa-battery and nf-mdi-battery:
The obvious winner here would be the
nf-mdi-battery-series, as they have the most diverse
collection. Also, they chose to have their battery in a vertical
orientation, meaning it will take up less space in the status bar.
The problem arose when I got around to the
nf-mdi-battery-charging sub-series of the collection. It
would be kinda sick if I could show that the battery is charging
and what percentage it’s charging at, but with the Nerd Fonts
icons all I get are the 20, 30, 40, 60, 80, 90 and 100 percent
variants. Alas, the 10 and 50 percent are missing. -_-
This is not directly Nerd Fonts’ own fault, as the Material Design Icons icon set didn’t include them either. At least not in the version that Nerd Fonts used to patch with…
After some searching around I found the Material Design Icons Font repo, which included a much more up-to-date version of the icon pack. (The version Nerd Fonts still use is around five years old at this point) This newer version did indeed include the missing charging battery icons. However, as to not break backwards compatibility by reshuffling all the other glyphs, at a much later code point.
Which leads me to the next reason…
In case you aren’t familiar with unicode, it is basically a list of almost any symbol imaginable. To name a few:
I hope you get the picture.
Naturally, unicode even has dedicated sections for “private use”, which is where most icon fonts choose to put their glyphs. These are:
Nerd Fonts store all most of their glyphs in the first
section.
So what’s the problem?
Allow me to explain with some basic napkin math:
That seems to fit doesn’t it? Yes, however, the icon layouting of Nerd Fonts could have been better. In a way to future proof the standard, they added extra space between each icon set to add space for future icons to be added. The problem is that this extra space makes it all not fit inside the section. All Nerd Fonts have some icons inside the “CJK Compability Ideographs”-section. While this isn’t a big problem for anyone who doesn’t speak “CJK” (Chinese, Japanese, and Korean), it’s still something that strictly goes against the philosophy of unicode. An iconic trespassing, if you will. ;)
My biggest issue with this is that they could (and should) have use any of the latter “Supplementary Private Use Areas” instead, as they are both 65.533 glyphs each, more than enough to fit all of Nerd Fonts symbols (including spacing) nine times. Each.
Another fun consequence of this is that some fonts place common font diacritics (like ◌́ and ◌̂) in the Private Use Area, to be imported in other characters. So when Nerd Fonts replaces these diacritics, the font will still import whatever is there, and you’ll end up with gems like this:
Why do you need a patched font? Of course you want to see the icons in your status bar or terminal or whatever, but why should the icons be located in your main font? No, think about it.
I think there is a major misconception when it comes to fonts under
linux. Just because you set a single font in your terminal
configuration doesn’t mean it’s the only font that will be used. As
long as the program you’re using is relatively modern (like,
the-last-couple-decades modern) it should be using font libraries
which support font fallbacks. This means that any character your
primary font can’t draw, will be represented using another font that
does have a code point for that glyph. Like when installing emojies on
your system, all you actually have to do is to make sure the
font is detected by your system. (Run something like
fc-list | grep <font-name> if you wanna see if it’s
detected or not). Imagine if you had to patch your fonts with emojies,
that would be outrageous, no?
So why doesn’t Nerd Fonts just ship a patched font with only symbols? This would allow users to use Nerd Fonts in combination with any font they want. In fact, they shipped a file called Symbols-1000-em Nerd Font Complete.ttf that included all the glyphs, and for a year now I’ve been using it as a complement to my unpatched fonts without problems. But in the latest releases they have removed it for some reason. ¯\_ (ツ)_/¯
When I discovered the discrepancies with Nerd Fonts I wrote about
my findings in a GitHub
issue comment, proposing “a major reshuffle” of the glyphs.
ryanoasis, the owner of the project, commented on that
and understandably stated that the reshuffle wouldn’t happen until
Nerd Fonts version 3.0. And as I have not seen a roadmap to the next
major version, I don’t have high hopes of that ever happening.
My solution to this is downloading the icon sets manually instead. Currently I’m using the following icon sets:
NOTE: Since this isn’t a valid Nerd Font configuration, you will have to configure what glyphs to use manually if the program supports it.
Another conclusion to take away from this post:
If you are designing a standard, please make sure it’s a good standard.