71 lines
2.9 KiB
Markdown
71 lines
2.9 KiB
Markdown
# OCaml {#sec-language-ocaml}
|
|
|
|
OCaml libraries should be installed in `$(out)/lib/ocaml/${ocaml.version}/site-lib/`. Such directories are automatically added to the `$OCAMLPATH` environment variable when building another package that depends on them or when opening a `nix-shell`.
|
|
|
|
Given that most of the OCaml ecosystem is now built with dune, nixpkgs includes a convenience build support function called `buildDunePackage` that will build an OCaml package using dune, OCaml and findlib and any additional dependencies provided as `buildInputs` or `propagatedBuildInputs`.
|
|
|
|
Here is a simple package example. It defines an (optional) attribute `minimumOCamlVersion` that will be used to throw a descriptive evaluation error if building with an older OCaml is attempted. It uses the `fetchFromGitHub` fetcher to get its source. It sets the `doCheck` (optional) attribute to `true` which means that tests will be run with `dune runtest -p angstrom` after the build (`dune build -p angstrom`) is complete. It uses `alcotest` as a build input (because it is needed to run the tests) and `bigstringaf` and `result` as propagated build inputs (thus they will also be available to libraries depending on this library). The library will be installed using the `angstrom.install` file that dune generates.
|
|
|
|
```nix
|
|
{ stdenv
|
|
, fetchFromGitHub
|
|
, buildDunePackage
|
|
, alcotest
|
|
, result
|
|
, bigstringaf
|
|
}:
|
|
|
|
buildDunePackage rec {
|
|
pname = "angstrom";
|
|
version = "0.10.0";
|
|
|
|
minimumOCamlVersion = "4.03";
|
|
|
|
src = fetchFromGitHub {
|
|
owner = "inhabitedtype";
|
|
repo = pname;
|
|
rev = version;
|
|
sha256 = "0lh6024yf9ds0nh9i93r9m6p5psi8nvrqxl5x7jwl13zb0r9xfpw";
|
|
};
|
|
|
|
buildInputs = [ alcotest ];
|
|
propagatedBuildInputs = [ bigstringaf result ];
|
|
doCheck = true;
|
|
|
|
meta = {
|
|
homepage = "https://github.com/inhabitedtype/angstrom";
|
|
description = "OCaml parser combinators built for speed and memory efficiency";
|
|
license = stdenv.lib.licenses.bsd3;
|
|
maintainers = with stdenv.lib.maintainers; [ sternenseemann ];
|
|
};
|
|
}
|
|
```
|
|
|
|
Here is a second example, this time using a source archive generated with `dune-release`. It is a good idea to use this archive when it is available as it will usually contain substituted variables such as a `%%VERSION%%` field. This library does not depend on any other OCaml library and no tests are run after building it.
|
|
|
|
```nix
|
|
{ stdenv
|
|
, fetchurl
|
|
, buildDunePackage
|
|
}:
|
|
|
|
buildDunePackage rec {
|
|
pname = "wtf8";
|
|
version = "1.0.1";
|
|
|
|
minimumOCamlVersion = "4.01";
|
|
|
|
src = fetchurl {
|
|
url = "https://github.com/flowtype/ocaml-${pname}/releases/download/v${version}/${pname}-${version}.tbz";
|
|
sha256 = "1msg3vycd3k8qqj61sc23qks541cxpb97vrnrvrhjnqxsqnh6ygq";
|
|
};
|
|
|
|
meta = with stdenv.lib; {
|
|
homepage = "https://github.com/flowtype/ocaml-wtf8";
|
|
description = "WTF-8 is a superset of UTF-8 that allows unpaired surrogates.";
|
|
license = licenses.mit;
|
|
maintainers = [ maintainers.eqyiel ];
|
|
};
|
|
}
|
|
```
|