{
  lix-docs,
  stdenv,
  vim,
  perl,
  ...
}:
let
  f = "find . -type f -exec";
  s = "${f} sed -i";
in
stdenv.mkDerivation {
  inherit (lix-docs) pname version;

  src = lix-docs.src;

  nativeBuildInputs = [
    vim
    perl
  ];

  installPhase = ''
    defaultFix() {
      sed -i '1,2d' $0
      sed -i '1s/ - /\n\n/' $0
      sed -i '1s/^/# /' $0
      sed -i '3s/\w/\u&/' $0
      sed -i '3s/$/\./' $0
    }
    export -f defaultFix

    mkdir $out
    cp -r ${lix-docs.doc}/manualMD/* $out
    chmod -R +w $out
    pushd $out
    mv introduction.md index.md
    mv advanced-topics/advanced-topics.md advanced-topics/index.md
    mv advanced-topics Advanced-Topics
    mv architecture/architecture.md architecture/index.md
    mv command-ref Command-Reference
    pushd Command-Reference
    mv command-ref.md index.md
    mv files.md files/index.md
    mv nix-env.md nix-env/index.md
    mv nix-store.md nix-store/index.md
    # Fixup all Nix3(aka new cli) commands
    pushd new-cli
    ${s} '6,7d' {} \;
    ${s} '6s/ - /\n\n/' {} \;
    ${s} '6s/^/# /' {} \;
    ${s} '8s/\w/\u&/' {} \;
    ${s} '8s/$/\./' {} \;
    ${f} ex -c '1,5m9' -c w -c q {} \;
    popd
    mv new-cli New-CLI
    # Fixup all non-nix3 commands
    find . -type f -name "nix-*.md" -exec bash -c 'defaultFix "$0"' {} \;
    # Fixup nix-store
    pushd nix-store
    find . -type f -name "*.md" -exec bash -c 'defaultFix "$0"' {} \;
    sed -i 's!\./nix-store!\./!g' index.md
    popd

    # Fixup Nix-env
    pushd nix-env
    find . -type f -name "*.md" -exec bash -c 'defaultFix "$0"' {} \;
    sed -i 's!\./nix-env!\./!g' index.md
    popd
    popd

    # Contributing directory
    pushd contributing
    mv contributing.md index.md
    ex -c '1,9m11' -c w -c q experimental-features.md
    sed -i 's!^## \[\(.*\)\]!## \1 !g' experimental-features.md
    popd

    # Final directories
    mv installation/installation.md installation/index.md
    mv package-management/package-management.md package-management/index.md
    mv package-management Package-Management
    mv protocols/protocols.md protocols/index.md
    mv release-notes/release-notes.md release-notes/index.md

    # Admonitions
    find . -type f -name "*.md" -exec perl -pi -e 's/  <div class="warning">/!!! warning/g' {} \;
    find . -type f -name "*.md" -exec sed -i '/<\/div>/d' {} \;
    find . -type f -name "*.md" -exec perl -pi -e 's/\n\n\n/placeholderstring123/g' -0 {} \;
    find . -type f -name "*.md" -exec sed -i '/^!!! warning/,/placeholderstring123/s/^/\ \ \ \ /' {} \;
    find . -type f -name "*.md" -exec perl -pi -e 's/placeholderstring123/\n\n\n/g' -0 {} \;
    find . -type f -name "*.md" -exec perl -pi -e 's/  > \*\*Warning\*\*/!!! warning2/g' {} \;
    find . -type f -name "*.md" -exec sed -i '/^!!! warning2/,/^$/s/  >/\ \ \ /' {} \;
    find . -type f -name "*.md" -exec sed -i 's/!!! warning2/!!! warning/' {} \;
    find . -type f -name "*.md" -exec sed -i 's/^\ \ \ \ !!! warning/!!! warning/' {} \;
    find . -type f -name "*.md" -exec perl -pi -e 's/!!! warning\n   \n/!!! warning\n/g' -0 {} \;

    # Increase all headings past line 1 by one level
    # Lix docs all have level-1 headings, we need at least level 2
    find . -type f -name "*.md" -exec sed -i '2,$s/# [^#]*/#&/g' {} \;

    # Clean up some local links
    find . -type f -name "*.md" -exec sed -i 's/command-ref/Command-Reference/g' {} \;
    find . -type f -name "*.md" -exec sed -i 's/new-cli/New-CLI/g' {} \;
    find . -type f -name "*.md" -exec sed -i 's/Command-Reference\.(?:html|md)//g' {} \;
    find . -type f -name "*.md" -exec sed -i 's/conf-file\.(?:html|md)/conf-file/g' {} \;
    find . -type f -name "*.md" -exec sed -i 's/values\.(?:html|md)/values/g' {} \;
  '';
}