2021-09-03 14:52:29 +01:00
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# Nim {#nim}
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## Overview {#nim-overview}
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The Nim compiler, a builder function, and some packaged libraries are available
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in Nixpkgs. Until now each compiler release has been effectively backwards
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compatible so only the latest version is available.
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## Nim program packages in Nixpkgs {#nim-program-packages-in-nixpkgs}
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Nim programs can be built using `nimPackages.buildNimPackage`. In the
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case of packages not containing exported library code the attribute
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`nimBinOnly` should be set to `true`.
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The following example shows a Nim program that depends only on Nim libraries:
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```nix
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{ lib, nimPackages, fetchurl }:
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nimPackages.buildNimPackage rec {
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pname = "hottext";
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version = "1.4";
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nimBinOnly = true;
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src = fetchurl {
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url = "https://git.sr.ht/~ehmry/hottext/archive/v${version}.tar.gz";
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doc: use sri hash syntax
The nixpkgs manual contains references to both sri hash and explicit
sha256 attributes. This is at best confusing to new users. Since the
final destination is exclusive use of sri hashes, see nixos/rfcs#131,
might as well push new users in that direction gently.
Notable exceptions to sri hash support are builtins.fetchTarball,
cataclysm-dda, coq, dockerTools.pullimage, elixir.override, and
fetchCrate. None, other than builtins.fetchTarball, are fundamentally
incompatible, but all currently accept explicit sha256 attributes as
input. Because adding backwards compatibility is out of scope for this
change, they have been left intact, but migration to sri format has been
made for any using old hash formats.
All hashes have been manually tested to be accurate, and updates were
only made for missing upstream artefacts or bugs.
2022-12-03 19:49:00 +00:00
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hash = "sha256-hIUofi81zowSMbt1lUsxCnVzfJGN3FEiTtN8CEFpwzY=";
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2021-09-03 14:52:29 +01:00
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};
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buildInputs = with nimPackages; [
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bumpy
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chroma
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flatty
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nimsimd
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pixie
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sdl2
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typography
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vmath
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zippy
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];
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}
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```
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## Nim library packages in Nixpkgs {#nim-library-packages-in-nixpkgs}
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Nim libraries can also be built using `nimPackages.buildNimPackage`, but
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often the product of a fetcher is sufficient to satisfy a dependency.
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The `fetchgit`, `fetchFromGitHub`, and `fetchNimble` functions yield an
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output that can be discovered during the `configurePhase` of `buildNimPackage`.
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Nim library packages are listed in
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[pkgs/top-level/nim-packages.nix](https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/nim-packages.nix) and implemented at
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[pkgs/development/nim-packages](https://github.com/NixOS/nixpkgs/tree/master/pkgs/development/nim-packages).
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The following example shows a Nim library that propagates a dependency on a
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non-Nim package:
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```nix
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{ lib, buildNimPackage, fetchNimble, SDL2 }:
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buildNimPackage rec {
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pname = "sdl2";
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version = "2.0.4";
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src = fetchNimble {
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inherit pname version;
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doc: use sri hash syntax
The nixpkgs manual contains references to both sri hash and explicit
sha256 attributes. This is at best confusing to new users. Since the
final destination is exclusive use of sri hashes, see nixos/rfcs#131,
might as well push new users in that direction gently.
Notable exceptions to sri hash support are builtins.fetchTarball,
cataclysm-dda, coq, dockerTools.pullimage, elixir.override, and
fetchCrate. None, other than builtins.fetchTarball, are fundamentally
incompatible, but all currently accept explicit sha256 attributes as
input. Because adding backwards compatibility is out of scope for this
change, they have been left intact, but migration to sri format has been
made for any using old hash formats.
All hashes have been manually tested to be accurate, and updates were
only made for missing upstream artefacts or bugs.
2022-12-03 19:49:00 +00:00
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hash = "sha256-qDtVSnf+7rTq36WAxgsUZ8XoUk4sKwHyt8EJcY5WP+o=";
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2021-09-03 14:52:29 +01:00
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};
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propagatedBuildInputs = [ SDL2 ];
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}
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```
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## `buildNimPackage` parameters {#buildnimpackage-parameters}
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All parameters from `stdenv.mkDerivation` function are still supported. The
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following are specific to `buildNimPackage`:
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* `nimBinOnly ? false`: If `true` then build only the programs listed in
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the Nimble file in the packages sources.
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* `nimbleFile`: Specify the Nimble file location of the package being built
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rather than discover the file at build-time.
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* `nimRelease ? true`: Build the package in *release* mode.
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* `nimDefines ? []`: A list of Nim defines. Key-value tuples are not supported.
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* `nimFlags ? []`: A list of command line arguments to pass to the Nim compiler.
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Use this to specify defines with arguments in the form of `-d:${name}=${value}`.
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* `nimDoc` ? false`: Build and install HTML documentation.
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* `buildInputs` ? []: The packages listed here will be searched for `*.nimble`
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files which are used to populate the Nim library path. Otherwise the standard
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behavior is in effect.
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