feat: Add sppl (#5)

* feat: add sppl package
* fix: use nixpkgs-compatible versions of numpy etc

The GitHub (rather than PyPi) pinned source can be
removed once it is released as 2.0.5 or greater on Pypi.

.github/workflows/nix.yaml

@@ -14,17 +14,26 @@ jobs:
       with:
         nix_path: nixpkgs=channel:nixos-23.11
     - uses: DeterminateSystems/magic-nix-cache-action@v2
-    - run: |
+    - name:  build sppl
+      run: |
+        nix build \
+          -L \
+          -o ./sppl \
+          '.#sppl'
+    - name:  build base image (not pushed)
+      run: |
         nix build \
           -L \
           -o ./imgBase \
           '.#ociImgBase'
-    - run: |
+    - name:  build Gensql Query image
+      run: |
         nix build \
           -L \
           -o ./imgGensqlQuery \
           '.#ociImgGensqlQuery'
-    - run: |
+    - name:  build Loom image
+      run: |
         nix build \
           -L \
           -o ./imgLoom \

flake.nix

@@ -25,6 +25,8 @@
       # apps, and devshells are per system.
       perSystem = { config, self', inputs', pkgs, system, ... }:
       let
+        sppl = pkgs.callPackage ./pkgs/sppl {};
+
         ociImgBase = pkgs.callPackage ./pkgs/oci/base {
           inherit nixpkgs;
           basicTools = self.lib.basicTools;
@@ -46,14 +48,24 @@
         packages = loom.more_packages // {
           inherit
             loom
+            sppl
+
             ociImgBase
             ociImgGensqlQuery
             ociImgLoom
           ;
         };
       in {
         devShells.default = pkgs.mkShell {
-          buildInputs = [] ++ toolkit;
+          packages = [] ++ toolkit;
+        };
+
+        devShells.sppl = pkgs.mkShell {
+          packages
+            = [sppl]
+            ++ sppl.checkInputs
+            ++ toolkit
+          ;
         };
 
         inherit packages;

pkgs/sppl/default.nix

@@ -0,0 +1,50 @@
+{ pkgs,
+  system,
+  ...
+}: let
+
+  # relies on specific versions of deps that are no longer present in
+  # nixpkgs stable; we must checkout a specific SHA
+  nixpkgs-sppl = import (pkgs.fetchFromGitHub {
+      owner = "nixos";
+      repo = "nixpkgs";
+      rev = "994df04c3c700fe9edb1b69b82ba3c627e5e04ff";
+      sha256 = "sha256-60hLkFqLRI+5XEeacXaVPHdl6m/P8rN2L4luLGxklqs=";
+    }) {inherit system;};
+  pypkgs = nixpkgs-sppl.python39Packages;
+
+  sppl = pypkgs.buildPythonPackage rec { # not in nixpkgs
+    pname = "sppl";
+    version = "2.0.4";
+
+    #  Use a  version of sppl that has Nixpkgs-compatible versions of some packages
+    src = pkgs.fetchFromGitHub {
+      owner = "probsys";
+      repo = "sppl";
+      rev = "ab6435648e56df1603c4d8d27029605c247cb9f5";
+      sha256 = "sha256-hFIR073wDRXyt8EqFkLZNDdGUjPTyWYOfDg5eGTjvz0=";
+    };
+
+    propagatedBuildInputs = with pypkgs; [
+      astunparse
+      numpy
+      scipy
+      sympy
+    ];
+
+    checkInputs = with pypkgs; [
+      coverage
+      pytest
+      pytestCheckHook
+      pytest-timeout
+    ];
+
+    pytestFlagsArray = [ "--pyargs" "sppl" ];
+
+    pipInstallFlags = [ "--no-deps" ];
+
+    passthru.runtimePython = nixpkgs-sppl.python39.withPackages (p: [ sppl ]);
+    passthru.checkInputs = checkInputs;
+  };
+
+in sppl