Custom waterway navigation

Hello I am new to Graphhopper and I try to make a custom profile for navigating on waterways only. Where and how exactly do I have to make configurations on the Source Code.
I dont want to ask such general Questions but I didnt found any updated resources here or on GitHub.

Thank you in advance.

@easbar built a great prototyp for this. See this PR Extract WaySegmentParser from OSMReader by easbar · Pull Request #2448 · graphhopper/graphhopper · GitHub and the linked branch: Comparing master...waterway_router · graphhopper/graphhopper · GitHub

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