To build this forest, you need to have a working installation of the following software:
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LaTeX, preferably the full TeXLive distribution
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forester, which you can install usingopam install forester; at times, you may need to build from source if I haven't released the latest version to opam
Once you have ensured that these programs are installed and in your PATH, simply run ./build.sh. To view the forest, you can open output/index.xml in your favorite browser: for Firefox, you may need to set security.fileuri.strict_origin_policy to false in about:config. Alternatively, you can serve the output directory from a local webserver to avoid this.
If you have fswatch installed, you can run ./watch.sh to watch for changes to the trees directory and rebuild accordingly.
This forest has a small JavaScript component (javascript/forester.js), which creates a keyboard command palette. There is no need to have any of the JavaScript or Node ecosystem installed on your machine; all JavaScript dependencies are kept bundled in source control. If you wish to upgrade this bundle, you will need to have a working installation of npm, and then run ./bundle-js.sh and commit the resulting changes. It is not ordinarily necessary to do this.