fix(fish): poetry completions

overlays/fixes.nix

@@ -0,0 +1,16 @@
+{ lib, ... }:
+
+final: prev: {
+  # python-poetry/poetry#5929
+  poetry = final.symlinkJoin {
+    name = "poetry";
+    paths = [ prev.poetry ];
+    postBuild =
+      let
+        regex = "s/'([a-z]*[[:blank:]][a-z]*)''/\1'/g";
+      in
+      ''
+        ${lib.getExe final.gnused} -i -E "${regex}" "$out/share/fish/vendor_completions.d/poetry.fish"
+      '';
+  };
+}