- There are all the schemes, collections and a few thousand packages, as defined upstream (perhaps with tiny differences).

- By default you only get executables and files needed during runtime, and a little documentation for the core packages. To change that, you need to add `pkgFilter` function to `combine`.

  ```nix
  texlive.combine {
    # inherit (texlive) whatever-you-want;
    pkgFilter =
      pkg: pkg.tlType == "run" || pkg.tlType == "bin" || pkg.hasManpages || pkg.pname == "cm-super";
    # elem tlType [ "run" "bin" "doc" "source" ]
    # there are also other attributes: version, name
  }
  ```

- You can list packages e.g. by `nix repl`.

  ```ShellSession
  $ nix repl
  nix-repl> :l <nixpkgs>
  nix-repl> texlive.collection-[TAB]
  ```

- Note that the wrapper assumes that the result has a chance to be useful. For example, the core executables should be present, as well as some core data files. The supported way of ensuring this is by including some scheme, for example, `scheme-basic`, into the combination.

- TeX Live packages are also available under `texlive.pkgs` as derivations with outputs `out`, `tex`, `texdoc`, `texsource`, `tlpkg`, `man`, `info`. They cannot be installed outside of `texlive.combine` but are available for other uses. To repackage a font, for instance, use

  ```nix
  stdenvNoCC.mkDerivation (finalAttrs: {
    src = texlive.pkgs.iwona;
    dontUnpack = true;

    inherit (finalAttrs.src) pname version;

    installPhase = ''
      runHook preInstall
      install -Dm644 $src/fonts/opentype/nowacki/iwona/*.otf -t $out/share/fonts/opentype
      runHook postInstall
    '';
  })
  ```

  See `biber`, `iwona` for complete examples.

## Custom packages {#sec-language-texlive-custom-packages}

You may find that you need to use an external TeX package. A derivation for such package has to provide the contents of the "texmf" directory in its `"tex"` output, according to the [TeX Directory Structure](https://tug.ctan.org/tds/tds.html). Dependencies on other TeX packages can be listed in the attribute `tlDeps`.

The functions `texlive.combine` and `texlive.withPackages` recognise the following outputs:

- `"out"`: contents are linked in the TeX Live environment, and binaries in the `$out/bin` folder are wrapped;
- `"tex"`: linked in `$TEXMFDIST`; files should follow the TDS (for instance `$tex/tex/latex/foiltex/foiltex.cls`);
- `"texdoc"`, `"texsource"`: ignored by default, treated as `"tex"`;
- `"tlpkg"`: linked in `$TEXMFROOT/tlpkg`;
- `"man"`, `"info"`, ...: the other outputs are combined into separate outputs.

When using `pkgFilter`, `texlive.combine` will assign `tlType` respectively `"bin"`, `"run"`, `"doc"`, `"source"`, `"tlpkg"` to the above outputs.

Here is a (very verbose) example. See also the packages `auctex`, `eukleides`, `mftrace` for more examples.

```nix
with import <nixpkgs> { };

let
  foiltex = stdenvNoCC.mkDerivation {
    pname = "latex-foiltex";
    version = "2.1.4b";