autodep env variables

autodeps/default.nix

@@ -0,0 +1,47 @@
+{ lib, src, config }:
+let
+  inherit (builtins) readFile pathExists attrNames hasAttr;
+  inherit (lib) map intersectLists foldl splitString getAttrFromPath;
+
+  cargoLockDeps =
+    if pathExists (src + /Cargo.lock) then
+      let
+        cargoLock = fromTOML (readFile (src + /Cargo.lock));
+      in
+      map (package: package.name) cargoLock.package
+    else [ ];
+  availableAutoDeps = import ./deps.nix;
+  detectedDeps = intersectLists cargoLockDeps (attrNames availableAutoDeps);
+  mergedDetectedDeps =
+    if config.autodeps then
+      foldl
+        (merged: dep: {
+          build = merged.build ++ (availableAutoDeps.${dep}.build or [ ]);
+          native = merged.native ++ (availableAutoDeps.${dep}.native or [ ]);
+          env =
+            if (hasAttr "env" availableAutoDeps.${dep}) then
+              pkgs: (merged.env pkgs) // (availableAutoDeps.${dep}.env pkgs)
+            else merged.env;
+        })
+        {
+          build = [ ];
+          native = [ ];
+          env = pkgs: { };
+        }
+        detectedDeps else {
+      build = [ ];
+      native = [ ];
+      env = pkgs: { };
+    };
+  getPkgs = pkgs: deps:
+    let
+      depPaths = map (splitString ".") deps;
+    in
+    map (path: getAttrFromPath path pkgs) depPaths;
+  autoDeps = pkgs: {
+    buildInputs = getPkgs pkgs mergedDetectedDeps.build;
+    nativeBuildInputs = with pkgs; [ pkg-config ] ++ (getPkgs pkgs mergedDetectedDeps.native);
+    env = mergedDetectedDeps.env pkgs;
+  };
+in
+autoDeps