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larsenwork / monoid

Customisable coding font with alternates, ligatures and contextual positioning. Crazy crisp at 12px/9pt. http://larsenwork.com/monoid/
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incorrect rendering of ligatures/code points disappearing #122

Closed smason closed 9 years ago

smason commented 9 years ago

Hi, I've just been playing with Monoid and found that the character sequence <==> (i.e. four UTF code points—<,=,=,>) only gets rendered as the precomposed ligature:

double equals greater

This is under OSX 10.10 and occurs within LightTable and the system program FontBook. I would have expected it to display the non-precomposed code points, or at least not loose the first '<' completely. I've not looked for further examples. This is a bit scary, but otherwise a great typeface! Cheers, Sam

rzlourenco commented 9 years ago

This issue is also present in Atom on Linux.

larsenwork commented 9 years ago

I've thought about this and one way to make the ligatures "safer" would be to "wrap" them in spaces so e.g. only `,<,=,=,>, ` get's recognised

But I don't know enough coding languages to know which ligatures could be "wrapped" in spaces.

screen shot 2015-08-10 at 14 00 13 screen shot 2015-08-10 at 14 00 16

larsenwork commented 9 years ago

https://dl.dropboxusercontent.com/u/3019777/Monoid-Regular.ttf should fix it, please test

smason commented 9 years ago

Thanks for looking into this! I thought that there was some sort of finite state machine described by the font file. I thought that the table definitions could be reordered to "fix" this bug, but this is only my inference from looking at other similar projects. I've also tried using "Fira Code" and this exhibits what I would consider to be correct behaviour without having the operator surrounded by spaces.

smason commented 9 years ago

I've just tried using the updated font and it works as expected…

larsenwork commented 9 years ago

@smason Monoid has a unique approach to ligatures (compared to e.g. Fira Mono and the fonts I've seen so far) in that I don't use ligatures but contextual alternates because I want the font to still be monospaced which e.g. Fira mono isn't.

Details here under "technical issues" : https://medium.com/@larsenwork/ligatures-coding-fonts-5375ab47ef8e

larsenwork commented 9 years ago

*Fira Code

larsenwork commented 9 years ago

fixed in 0.61