# NOTE: This module is temporary. It will soon be upstreamed to a dedicated flake-parts module,
# and replaced with a minimal Nix file, similar to how haskell-flake is used in other repositories.
# For progress and discussion, see: https://github.com/juspay/python-nix-template/issues/2
{ inputs, ... }:
let
inherit (inputs) uv2nix pyproject-nix pyproject-build-systems;
in
{
perSystem = { self', config, pkgs, ... }:
let
inherit (pkgs) lib;
root = ./../.;
pythonVersionFile = "${root}/.python-version";
versionStr =
with builtins;
with lib;
let
raw = if pathExists pythonVersionFile then readFile pythonVersionFile else "";
m = match "([0-9]+)\\.([0-9]+).*" (removeSuffix "\n" raw); # ["3" "13"]
in
if m != null && m != [ ] then concatStringsSep "" m else "313";
python = pkgs."python${versionStr}";
workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = root; };
overlay = workspace.mkPyprojectOverlay { sourcePreference = "wheel"; };
editableOverlay = workspace.mkEditablePyprojectOverlay { root = "$REPO_ROOT"; };
pythonSet =
(pkgs.callPackage pyproject-nix.build.packages {
inherit python;
}).overrideScope
(
lib.composeManyExtensions [
pyproject-build-systems.overlays.default
overlay
]
);
# reuquired to create editable venv
editablePythonSet = pythonSet.overrideScope (
lib.composeManyExtensions [
editableOverlay
(final: prev: {
juspay-mcp = prev.juspay-mcp.overrideAttrs (old: {
src = lib.fileset.toSource {
root = old.src;
fileset = lib.fileset.unions [
(old.src + "/pyproject.toml")
(old.src + "/README.md")
(old.src + "/juspay_mcp")
(old.src + "/juspay_dashboard_mcp")
(old.src + "/juspay_docs_mcp")
];
};
nativeBuildInputs =
old.nativeBuildInputs
++ final.resolveBuildSystem {
editables = [ ];
};
});
})
]
);
venv = editablePythonSet.mkVirtualEnv "juspay-mcp" workspace.deps.all;
in
{
packages = {
default = pythonSet.mkVirtualEnv "juspay-mcp" workspace.deps.all;
test = python.withPackages (ps: with ps; [ pytest ]);
stdio = pkgs.writeShellApplication {
name = "stdio";
runtimeInputs = [ venv ];
text = ''
exec "${lib.getExe' self'.packages.default "python"}" ${inputs.self}/juspay_mcp/stdio.py "$@"
'';
};
};
apps = {
default.program = "${lib.getExe' self'.packages.default "juspay-mcp"}";
test.program = "${lib.getExe' self'.packages.test "pytest"}";
stdio.program = "${lib.getExe' self'.packages.stdio "stdio"}";
};
devShells = {
default = self'.devShells.uv2nix;
uv2nix = pkgs.mkShell {
inputsFrom = [
config.pre-commit.devShell
];
packages = [
venv
pkgs.uv
];
env = {
UV_NO_SYNC = "1";
UV_PYTHON = "${lib.getExe' venv "python"}";
UV_PYTHON_DOWNLOADS = "never";
};
shellHook = # sh
''
# Undo dependency propagation by nixpkgs.
unset PYTHONPATH
# Get repository root using git. This is expanded at runtime by the editable `.pth` machinery.
export REPO_ROOT=$(git rev-parse --show-toplevel)
'';
};
};
};
}
