add web API or command-line tool

[VladimirAlexiev]

Currently I generate the SHACL path grammar diagram w3c/data-shapes#483
by hand at https://www.bottlecaps.de/rr/ui (check SVG, uncheck Embedded, download).

As per discussions at w3c/data-shapes#483 (comment), one of the main SHACL editor wants me to automate this process (eg for plantuml, I use its command-line version and make).

I could read up on web automation using headless browsers... but the best way is if the website exposes an API, or there is a command-line tool to use.

• I browsed around the webapp source but can't figure out if there's an API that can be used. (Also made a half-hearted attempt to trace in the browser console tools)
• I know that you build a .jar, but I can't find any info about calling it as a command-line tool.

Would it be a lot of work to add one of these options?

[GuntherRademacher]

RR already includes a command-line/batch mode in the executable rr.war. You can either start the GUI

java -jar rr.war -gui

or generate diagrams in batch mode from a grammar file:

java -jar rr.war grammar.ebnf

Running without arguments prints the full list of options:

java -jar rr.war

CLI details are in the README under “Distribution”.

If you need programmatic access, there’s also rr-lib on Maven Central that you can call from Java.