adhoc-python/flake.nix

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{
description = "Flake utils demo";
inputs = {
nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
flake-utils.url = "github:numtide/flake-utils";
pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
};
outputs = { self, nixpkgs, flake-utils, pre-commit-hooks }:
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flake-utils.lib.eachDefaultSystem
(system:
let
pkgs = nixpkgs.legacyPackages.${system};
minVersion = 8;
maxVersion = 11;
mkPython = version: "python3${toString version}";
pythonVersions = map mkPython (pkgs.lib.lists.range minVersion maxVersion);
mkDevShell = version: pkgs.mkShell {
buildInputs = [ pkgs.${version} pkgs.poetry ];
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};
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addPreCommit = shell: shell.overrideAttrs (old: {
inherit (self.checks.${system}.pre-commit-check) shellHook;
});
devShells = pkgs.lib.genAttrs pythonVersions mkDevShell;
preCommitShells = pkgs.lib.mapAttrs' (name: value: pkgs.lib.nameValuePair (name + "-precommit") (addPreCommit value)) devShells;
allShells = devShells // preCommitShells;
in
{
devShells = allShells // {
default = self.devShells.${system}."${mkPython maxVersion}-precommit";
};
checks.pre-commit-check = pre-commit-hooks.lib."${system}".run {
src = ./.;
hooks = {
nixpkgs-fmt.enable = true;
statix.enable = true;
shellcheck.enable = true;
black.enable = true;
isort.enable = true;
};
};
}) // {
templates.default = {
path = ./.;
description = "A adhoc python environment";
};
};
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}