KOreader is a bit extensive. Depending on what you want you really only need to take a look at some of the drawing stuff:
(probably not exhaustive; just some quick links)
https://github.com/koreader/koreader...i/einkfb_h.lua
https://github.com/koreader/koreader...fer_einkfb.lua
https://github.com/koreader/koreader.../einkfb_decl.c
https://github.com/koreader/koreader...clude/einkfb.h
Relevant stuff for Plato:
https://github.com/baskerville/plato...rc/framebuffer
okreader doesn't include any GUI stuff afaik
But what do you mean by fancy calendar? You can easily display image and HTML files with what's included in KSM and a little scripting.
Quote:
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Also, how much of the default system can I delete? I mean I have a backup of anything, but is there a tutorial on how to just throw everything away (I don't need any of the default GUI stuff, I want it to boot right into my app).
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Just set starting your app as the default in KSM and leave the rest alone. Well, unless you just really, really,
really want to get rid of Nickel for some reason but I generally wouldn't. In that case you could replace it all with okreader.
Edit: but if you like Lua, you could also take KSM + KOReader as a base, whether to display generated images or to create your own widgets.
http://koreader.rocks/doc/modules/ui.widget.widget.html
In that case you could create a plugin, see some examples here:
https://github.com/koreader/koreader...033cfb/plugins
You could do something similar with Plato if you like Rust, I suppose. :P