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ii8
havoc doesn't display alsamixer / ncurses box-drawing characters correctly with RobotoMono font
I'm running havoc git on sway on arch linux.
If I set my font to RobotoMono in havoc.cfg like so:
[font]
path=/usr/share/fonts/TTF/RobotoMono-Regular.ttf
then the box drawing characters aren't displayed correctly when running alsamixer:
If I change my font to JetBrainsMonoNL-Regular.ttf then it's displayed correctly:
If I use sakura with RobotoMono, it's displayed correctly:
Since RobotoMono works with sakura, it appears the problem is with havoc.
So the issue here seems to be that the box drawing glyphs do not exist in that Roboto font, but not only that, the .notdef glyph which represents a character that does not have a glyph in a particular font is also missing(which violates the spec IIRC)
This is why there is just random data in those cells, because there was nothing to render into them.
I will add some code later so havoc can draw it's own .notdef glyph replacement when it is missing from a font.
What this sakura terminal probably does is take the glyph from a different font.
I found a workaround by launching havoc with a custom config file when I want to run alsamixer, like so: $ havoc -c $HOME/.config/havoc.cfg.with_alternate_font alsamixer "havoc.cfg.with_alternate_font" is identical to "havoc.cfg" except it specifies a font which has the box drawing characters. This way I get to use my preferred Roboto font in all cases except for alsamixer, which is fine with me.
Nice. Alternatively you could add the box drawing characters to roboto with font forge. Or we implement a font fallback mechanism in havoc so missing glyphs can be taken from other fonts, but I don't really want to add a fontconfig dependency.
I found that Foot Terminal by default uses it's own internal box drawing characters: https://codeberg.org/dnkl/foot/src/branch/master/doc/foot.ini.5.scd#L130
Since there's a workaround I'm not sure it makes sense to add this to Havoc. I like Havoc because it's simple and light and not weighed down by too many rarely used features.
It's a nice idea but looks like it's not all that trivial, theres 3 thousand lines of code in foot just for box drawing https://codeberg.org/dnkl/foot/src/branch/master/box-drawing.c Thats twice as much as my font renderer and caching mechanism just for some lines. Maybe I can find a simpler way to do it.