opentype-features: Add blog post about opentype

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+#+TITLE: Exploring OpenType Font Features
+#+DATE: 2022-01-22T19:10:17-05:00
+#+DRAFT: true
+#+DESCRIPTION: Checking out the OpenType features of a font
+#+TAGS[]: font emacs
+#+KEYWORDS[]:
+#+SLUG:
+#+SUMMARY:
+
+I just bought a new font to use as my primary face in Emacs. It's a
+cool one called [[https://www.monolisa.dev][MonoLisa]], I think it looks great.
+
+It has a nice looking script variant that lets you turn your italics
+into a cursive looking font. Unfortunately it's a fancy OpenType
+feature that most things, including Emacs don't support properly yet.
+
+In their [[https://www.monolisa.dev/faq][FAQ]] they mention that you can use a tool called [[https://github.com/twardoch/fonttools-opentype-feature-freezer][OpenType
+Feature Freezer]] to modify the font so that the optional glyphs become
+the default. They get used all the time without requiring the editor
+to properly support the OpenType feature.
+
+Other than telling you that it's possible they don't actually tell you
+which features are available and what they look like.
+
+Fortunately the Feature Freezer tool can help us here. If you pass it
+the =-r= flag, it will list out the features supported by the font.
+
+#+begin_src shell
+pyftfeatfreeze -r MonoLisa-RegularItalic.otf
+# Scripts and languages:
+-s 'DFLT'
+-s 'cyrl'
+-s 'cyrl' -l 'BGR '
+-s 'cyrl' -l 'SRB '
+-s 'latn'
+-s 'latn' -l 'AZE '
+-s 'latn' -l 'CRT '
+-s 'latn' -l 'KAZ '
+-s 'latn' -l 'MOL '
+-s 'latn' -l 'ROM '
+-s 'latn' -l 'TAT '
+-s 'latn' -l 'TRK '
+# Features:
+-f aalt,calt,case,ccmp,dnom,frac,liga,locl,numr,onum,ordn,salt,sinf,ss01,ss02,ss05,ss06,subs,sups,zero
+#+end_src
+
+
+While it's possible to find a list of what the OpenType features do on
+[[https://en.wikipedia.org/wiki/List_of_typographic_features][Wikipedia]], we're still left not knowing what the Stylistic Sets are.
+
+Once we have a list of features supported by the font, it's possible
+to test these features out on the MonoLisa website by modifying CSS
+variables.
+
+If we load the [[https://www.monolisa.dev/specimen][specimin]] or [[https://www.monolisa.dev/playground][playground]] page and find the CSS rule that
+sets the font for the page, we can add =font-feature-settings:= rules
+to test out the different options.
+
+For example, if we add =font-feature-settings: "ss02";=, this will
+enable the =ss02= feature on all text on the website. We can then go
+through each of the features listed out by the Feature Freezer and try
+them all out.
+
+From there we can figure out which features we want to enable and pass
+them to as arguments to the Feature Freezer and produce a font we with
+those features enabled by default.
+
+If we wanted to produce a font with the =ss01= and =ss02= features
+enabled by default, we could then run this command.
+
+#+begin_src shell
+pyftfeatfreeze -n -v -f ‘ss01,ss02’ source-font.otf output-font.otf
+#+end_src