{ lib, runCommand, fetchurl, file, texlive, writeShellScript }:

{

  tlpdbNix = runCommand "texlive-test-tlpdb-nix" {
    nixpkgsTlpdbNix = ../../tools/typesetting/tex/texlive/tlpdb.nix;
    tlpdbNix = texlive.tlpdb.nix;
  }
  ''
    mkdir -p "$out"
    diff -u "''${nixpkgsTlpdbNix}" "''${tlpdbNix}" | tee "$out/tlpdb.nix.patch"
  '';

  opentype-fonts = runCommand "texlive-test-opentype" {
    nativeBuildInputs = [
      (with texlive; combine { inherit scheme-medium libertinus-fonts; })
    ];
    input = builtins.toFile "opentype-testfile.tex" ''
      \documentclass{article}
      \usepackage{fontspec}
      \setmainfont{Libertinus Serif}
      \begin{document}
        \LaTeX{} is great
      \end{document}
    '';
  }
  ''
    export HOME="$(mktemp -d)"
    # We use the same testfile to test two completely different
    # font discovery mechanisms, both of which were once broken:
    #  - lualatex uses its own luaotfload script (#220228)
    #  - xelatex uses fontconfig (#228196)
    # both of the following two commands need to succeed.
    lualatex -halt-on-error "$input"
    xelatex -halt-on-error "$input"
    echo success > $out
  '';

  chktex = runCommand "texlive-test-chktex" {
    nativeBuildInputs = [
      (with texlive; combine { inherit scheme-infraonly chktex; })
    ];
    input = builtins.toFile "chktex-sample.tex" ''
      \documentclass{article}
      \begin{document}
        \LaTeX is great
      \end{document}
    '';
  } ''
    chktex -v -nall -w1 "$input" 2>&1 | tee "$out"
    grep "One warning printed" "$out"
  '';

  dvipng = lib.recurseIntoAttrs {
    # https://github.com/NixOS/nixpkgs/issues/75605
    basic = runCommand "texlive-test-dvipng-basic" {
      nativeBuildInputs = [ file texlive.combined.scheme-medium ];
      input = fetchurl {
        name = "test_dvipng.tex";
        url = "http://git.savannah.nongnu.org/cgit/dvipng.git/plain/test_dvipng.tex?id=b872753590a18605260078f56cbd6f28d39dc035";
        sha256 = "1pjpf1jvwj2pv5crzdgcrzvbmn7kfmgxa39pcvskl4pa0c9hl88n";
      };
    } ''
      cp "$input" ./document.tex

      latex document.tex
      dvipng -T tight -strict -picky document.dvi
      for f in document*.png; do
        file "$f" | tee output
        grep PNG output
      done

      mkdir "$out"
      mv document*.png "$out"/
    '';

    # test dvipng's limited capability to render postscript specials via GS
    ghostscript = runCommand "texlive-test-ghostscript" {
      nativeBuildInputs = [ file (with texlive; combine { inherit scheme-small dvipng; }) ];
      input = builtins.toFile "postscript-sample.tex" ''
        \documentclass{minimal}
        \begin{document}
          Ni
          \special{ps:
            newpath
            0 0 moveto
            7 7 rlineto
            0 7 moveto
            7 -7 rlineto
            stroke
            showpage
          }
        \end{document}
      '';
      gs_trap = writeShellScript "gs_trap.sh" ''
        exit 1
      '';
    } ''
      cp "$gs_trap" ./gs
      export PATH=$PWD:$PATH
      # check that the trap works
      gs && exit 1

      cp "$input" ./document.tex

      latex document.tex
      dvipng -T 1in,1in -strict -picky document.dvi
      for f in document*.png; do
        file "$f" | tee output
        grep PNG output
      done

      mkdir "$out"
      mv document*.png "$out"/
    '';
  };

  # https://github.com/NixOS/nixpkgs/issues/75070
  dvisvgm = runCommand "texlive-test-dvisvgm" {
    nativeBuildInputs = [ file texlive.combined.scheme-medium ];
    input = builtins.toFile "dvisvgm-sample.tex" ''
      \documentclass{article}
      \begin{document}
        mwe
      \end{document}
    '';
  } ''
    cp "$input" ./document.tex

    latex document.tex
    dvisvgm document.dvi -n -o document_dvi.svg
    cat document_dvi.svg
    file document_dvi.svg | grep SVG

    pdflatex document.tex
    dvisvgm -P document.pdf -n -o document_pdf.svg
    cat document_pdf.svg
    file document_pdf.svg | grep SVG

    mkdir "$out"
    mv document*.svg "$out"/
  '';

  texdoc = runCommand "texlive-test-texdoc" {
    nativeBuildInputs = [
      (with texlive; combine {
        inherit scheme-infraonly luatex texdoc;
        pkgFilter = pkg: lib.elem pkg.tlType [ "run" "bin" "doc" ];
      })
    ];
  } ''
    texdoc --version

    texdoc --debug --list texdoc | tee "$out"
    grep texdoc.pdf "$out"
  '';

  # test that language files are generated as expected
  hyphen-base = runCommand "texlive-test-hyphen-base" {
    hyphenBase = lib.head texlive.hyphen-base.pkgs;
    schemeFull = texlive.combined.scheme-full;
    schemeInfraOnly = texlive.combined.scheme-infraonly;
  } ''
    mkdir -p "$out"/{scheme-infraonly,scheme-full}

    # create language files with no hyphenation patterns
    cat "$hyphenBase"/tex/generic/config/language.us >language.dat
    cat "$hyphenBase"/tex/generic/config/language.us.def >language.def
    cat "$hyphenBase"/tex/generic/config/language.us.lua >language.dat.lua

    cat >>language.dat.lua <<EOF
    }
    EOF

    cat >>language.def <<EOF
    %%% No changes may be made beyond this point.

    \uselanguage {USenglish}             %%% This MUST be the last line of the file.
    EOF

    for fname in language.{dat,def,dat.lua} ; do
      diff --ignore-matching-lines='^\(%\|--\) Generated by ' -u \
        {"$hyphenBase","$schemeFull"/share/texmf-var}/tex/generic/config/"$fname" \
        | tee "$out/scheme-full/$fname.patch"
      diff --ignore-matching-lines='^\(%\|--\) Generated by ' -u \
        {,"$schemeInfraOnly"/share/texmf-var/tex/generic/config/}"$fname" \
        | tee "$out/scheme-infraonly/$fname.patch"
    done
  '';

  # test that fmtutil.cnf is fully regenerated on scheme-full
  fmtutilCnf = runCommand "texlive-test-fmtutil.cnf" {
    kpathsea = lib.head texlive.kpathsea.pkgs;
    schemeFull = texlive.combined.scheme-full;
  } ''
    mkdir -p "$out"

    diff --ignore-matching-lines='^# Generated by ' -u \
      {"$kpathsea","$schemeFull"/share/texmf-var}/web2c/fmtutil.cnf \
      | tee "$out/fmtutil.cnf.patch"
  '';

  # verify that the restricted mode gets enabled when
  # needed (detected by checking if it disallows --gscmd)
  repstopdf = runCommand "texlive-test-repstopdf" {
    nativeBuildInputs = [ (texlive.combine { inherit (texlive) scheme-infraonly epstopdf; }) ];
  } ''
    ! (epstopdf --gscmd echo /dev/null 2>&1 || true) | grep forbidden >/dev/null
    (repstopdf --gscmd echo /dev/null 2>&1 || true) | grep forbidden >/dev/null
    mkdir "$out"
  '';

}