texlive.tlpdb.nix: extract licensing information

        deps = (orig.xdvi.deps or []) ++  [ "metafont" ];

      };

      arabi-add = orig.arabi-add // {

        # tlpdb lists license as "unknown", but the README says lppl13: http://mirrors.ctan.org/language/arabic/arabi-add/README

        license = [  "lppl13c" ];

      };

      # remove dependency-heavy packages from the basic collections

      collection-basic = orig.collection-basic // {

        deps = lib.filter (n: n != "metafont" && n != "xdvi") orig.collection-basic.deps;

  /^catalogue-version/s/[\#,:\(\)]//g

  s/^catalogue-version_(.*)/  version = "\1";/p

  /^catalogue-license/{

    # wrap licenses in quotes

    s/ ([^ ]+)/ "\1"/g

    # adjust naming as in nixpkgs, the full texts of the licenses are available at https://www.ctan.org/license/${licenseName}

    s/"(cc-by(-sa)?-[1-4])"/"\10"/g

    s/"apache2"/"asl20"/g

    s/"artistic"/"artistic1-cl8"/g

    s/"bsd"/"bsd3"/g          # license text does not match exactly, but is pretty close

    s/"bsd4"/"bsdOriginal"/g

    s/"collection"/"free"/g   # used for collections of individual packages with distinct licenses. As TeXlive only contains free software, we can use "free" as a catchall

    s/"fdl"/"fdl13Only"/g

    s/"gpl1?"/"gpl1Only"/g

    s/"gpl2\+"/"gpl2Plus"/g

    s/"gpl3\+"/"gpl3Plus"/g

    s/"lgpl"/"lgpl2"/g

    s/"lgpl2\.1"/"lgpl21"/g

    s/"lppl"/"lppl13c"/g      # not used consistently, sometimes "lppl" refers to an older version of the license

    s/"lppl1\.2"/"lppl12"/g

    s/"lppl1\.3"/"lppl13c"/g  # If a work refers to LPPL 1.3 as its license, this is interpreted as the latest version of the 1.3 license (https://www.latex-project.org/lppl/)

    s/"lppl1\.3a"/"lppl13a"/g

    s/"lppl1\.3c"/"lppl13c"/g

    s/"other-free"/"free"/g

    s/"pd"/"publicDomain"/g

    s/^catalogue-license (.*)/  license = [ \1 ];/p

  }

  # extract deps

  /^depend ([^.]+|texlive\.infra)$/{

    # open a list