static-nix-shell.mkYsh: init

pkgs/by-name/static-nix-shell/package.nix

@@ -3,6 +3,7 @@
   bash,
   lib,
   makeBinaryWrapper,
+  oils-for-unix,
   python3,
   stdenv,
   zsh,
@@ -148,6 +149,18 @@ in rec {
     } // (removeAttrs attrs [ "bash" "pkgs" ])
   );
 
+  # `mkShell` specialization for `nix-shell -i ysh` (oil) scripts.
+  mkYsh = { pkgs ? {}, ...}@attrs:
+    let
+      pkgsAsAttrs = pkgsToAttrs "" pkgs' pkgs;
+      pkgsEnv = [ oils-for-unix ] ++ (builtins.attrValues pkgsAsAttrs);
+      pkgExprs = insertTopo "oils-for-unix" (builtins.attrNames pkgsAsAttrs);
+    in mkShell ({
+      inherit pkgsEnv pkgExprs;
+      interpreter = lib.getExe' oils-for-unix "ysh";
+    } // (removeAttrs attrs [ "oils-for-unix" "pkgs" ])
+  );
+
   # `mkShell` specialization for `nix-shell -i zsh` scripts.
   mkZsh = { pkgs ? {}, ...}@attrs:
     let