nov-mode, justify-knuth/plass, and visual-fill-column
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I've been trying out nov-mode, an epub-reader for emacs. In the README, the nov-mode author provides a demonstration of using some functions from justify-kp, paragraph justification for emacs using the Knuth/Plass algorithm.
While I can get the nov-mode author's example of using justify-kp to work, I haven't managed to figure out how it can be made compatible with visual-fill-column mode. Do you have any insights? It would be great to be able to properly use emacs to read epub with real paragraph justification.
TBH I'm not entirely sure what you mean by making justify-kp "compatible" with v-f-c-mode, but a quick look at nov-mode and justify-kp suggests to me that if you use the latter, you shouldn't be using v-f-c-mode at all. v-f-c-mode makes sense if Emacs handles text wrapping, while justify-kp's goal is to take text wrapping away from Emacs.
For example, from the relevant (second) screen shot on the nov-mode page, I gather that justify-kp occasionally places text beyond the margin (cf. the word 'window' in the quote at the top), but because v-f-c-mode narrows the text area, this is not possible. Emacs would simply put 'window' on the next line, regardless of what justify-kp does.
IOW justify-kp needs a wide text area, v-f-c-mode narrows it.