passExtensions.pass-import: install extension script and completion

The changes added in 40b9f4e meant that running the extension
from within pass, i.e. running `pass import` no longer worked because
the extension script didn't get installed and the completion scripts
for pimport don't get installed. This commit fixes that by manually
copying and wrapping the extension script and completion scripts

pkgs/tools/security/pass/extensions/import.nix

@@ -4,6 +4,7 @@
 , python3Packages
 , gnupg
 , pass
+, makeWrapper
 }:
 
 python3Packages.buildPythonApplication rec {
@@ -50,6 +51,16 @@ python3Packages.buildPythonApplication rec {
     $out/bin/pimport --list-exporters --list-importers
   '';
 
+  postInstall = ''
+    mkdir -p $out/lib/password-store/extensions
+    cp ${src}/scripts/import.bash $out/lib/password-store/extensions/import.bash
+    wrapProgram $out/lib/password-store/extensions/import.bash \
+      --prefix PATH : "${python3Packages.python.withPackages(_: propagatedBuildInputs)}/bin" \
+      --prefix PYTHONPATH : "$out/${python3Packages.python.sitePackages}" \
+      --run "export PREFIX"
+    cp -r ${src}/share $out/
+  '';
+
   meta = with lib; {
     description = "Pass extension for importing data from existing password managers";
     homepage = "https://github.com/roddhjav/pass-import";