Patterns for a basic hyphenation style of Finnish.
The current ("old") default Finnish hyphenation in TeX is based on basic Finnish hyphenation rules but it has also many exceptions to help hyphenating some compound words correctly. For example, it hyphenates "vi-deo-pro-jek-to-ri" correctly because it has special rule for "pr" letters. By the basic rules this would be "vi-de-op-ro-jek-to-ri". (Really correct hyphenation requires a spelling checker which knows that there are two words "video" and "projektori".)
However, the many exceptional patterns that help with some compound words come with side effects. For example, "paprika" has "pr" too and the exception made for things like "video-projektori" keeps "pr" together also in words like "papri-ka" (really: "pap-ri-ka"). Word "housut" is not hyphenated at all because there is a pattern which prevents hyphenating between "u" and "s" (in order to help with some compound words). There are many similar situations and the output is sometimes unexpected.
This project develops a new optional hyphenation variant for Finnish. The new variant follows only the basic Finnish hyphenation rules, so it produces all possible hyphenation points. This variant doesn't have special rules for handling some compounds words and hyphenation is allowed between two vowels ("kofe-iini") which is not ideal in typography.
The use of this variant requires a bit more manual hyphenation hints with compound words ("video-projektori") and some other cases. The positive side is that the output is expected because it just follows well-known basic rules. A document author knows in advance when manual help is needed.
From the top-level directory, run
pip3 install -r requirements.txt
python3 src/makelist
The script downloads an XML Finnish word list if needed, generates the patterns and hyphenates the word list with it, generating a hyphenated list.
In the tex directory, compile test-basic-patterns.tex with LuaLaTeX.