dream2nix/flake.nix
DavHau 60d89f776f improve flake interfaces and apps
- improve exposing apps for other flakes
  - configure overridesDirs via config
2021-11-07 15:18:28 +07:00

160 lines
4.9 KiB
Nix

{
description = "dream2nix: A generic framework for 2nix tools";
inputs = {
nixpkgs.url = "nixpkgs/nixos-unstable";
# required for translator nodejs/pure/package-lock
nix-parsec = { url = "github:nprindle/nix-parsec"; flake = false; };
# required for translator pip
mach-nix = { url = "mach-nix"; flake = false; };
# required for builder nodejs/node2nix
node2nix = { url = "github:svanderburg/node2nix"; flake = false; };
# required for utils.satisfiesSemver
poetry2nix = { url = "github:nix-community/poetry2nix/1.21.0"; flake = false; };
};
outputs = {
self,
mach-nix,
nix-parsec,
nixpkgs,
node2nix,
poetry2nix,
}@inp:
let
b = builtins;
lib = nixpkgs.lib;
supportedSystems = [ "x86_64-linux" "x86_64-darwin" ];
forAllSystems = f: lib.genAttrs supportedSystems (system:
f system (import nixpkgs { inherit system; overlays = [ self.overlay ]; })
);
# To use dream2nix in non-flake + non-IFD enabled repos, the source code of dream2nix
# must be installed into these repos (using nix run dream2nix#install).
# The problem is, all of dream2nix' dependecies need to be installed as well.
# Therefore 'externalPaths' contains all relevant files of external projects
# which dream2nix depends on. Exactly these files will be installed.
externalPaths = {
mach-nix = [
"lib/extractor/default.nix"
"lib/extractor/distutils.patch"
"lib/extractor/setuptools.patch"
"LICENSE"
];
node2nix = [
"nix/node-env.nix"
"LICENSE"
];
nix-parsec = [
"parsec.nix"
"lexer.nix"
"LICENSE"
];
poetry2nix = [
"semver.nix"
"LICENSE"
];
};
# create a directory containing the files listed in externalPaths
makeExternalDir = import ./src/utils/external-dir.nix;
externalDirFor = forAllSystems (system: pkgs: makeExternalDir {
inherit externalPaths externalSources pkgs;
});
# An interface to access files of external projects.
# This implementation aceeses the flake inputs directly,
# but if dream2nix is used without flakes, it defaults
# to another implementation of that function which
# uses the installed external paths instead (see default.nix)
externalSources =
lib.genAttrs
(lib.attrNames externalPaths)
(inputName: inp."${inputName}");
overridesDirs = [ "${./overrides}" ];
# system specific dream2nix api
dream2nixFor = forAllSystems (system: pkgs: import ./src rec {
externalDir = externalDirFor."${system}";
inherit externalSources lib pkgs;
config = {
inherit overridesDirs;
};
});
in
{
# overlay with flakes enabled nix
# (all of dream2nix cli dependends on nix ^2.4)
overlay = final: prev: {
nix = prev.writeScriptBin "nix" ''
${final.nixUnstable}/bin/nix --option experimental-features "nix-command flakes" "$@"
'';
};
# System independent dream2nix api.
# Similar to drem2nixFor but will require 'system(s)' or 'pkgs' as an argument.
# Produces flake-like output schema.
lib = (import ./src/lib.nix {
inherit externalPaths externalSources lib;
nixpkgsSrc = "${nixpkgs}";
})
# system specific dream2nix library
// (forAllSystems (system: pkgs:
import ./src {
inherit
externalSources
lib
overridesDirs
pkgs
;
}
));
# the dream2nix cli to be used with 'nix run dream2nix'
defaultApp =
forAllSystems (system: pkgs: self.apps."${system}".dream2nix);
# all apps including cli, install, etc.
apps = forAllSystems (system: pkgs:
dream2nixFor."${system}".apps.flakeApps
);
# a dev shell for working on dream2nix
# use via 'nix develop . -c $SHELL'
devShell = forAllSystems (system: pkgs: pkgs.mkShell {
buildInputs = with pkgs;
(with pkgs; [
nixUnstable
])
# using linux is highly recommended as cntr is amazing for debugging builds
++ lib.optionals stdenv.isLinux [ cntr ];
shellHook = ''
export NIX_PATH=nixpkgs=${nixpkgs}
export d2nExternalDir=${externalDirFor."${system}"}
export dream2nixWithExternals=${dream2nixFor."${system}".dream2nixWithExternals}
export d2nOverridesDirs=${./overrides}
echo -e "\nManually execute 'export dream2nixWithExternals={path to your dream2nix checkout}'"
'';
});
checks = forAllSystems (system: pkgs: import ./checks.nix {
inherit lib pkgs;
dream2nix = dream2nixFor."${system}";
});
};
}