From cda13fae0370e557c094bffb2df5ee9575e092ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Na=C3=AFm=20Favier?= <n@monade.li>
Date: Fri, 2 Dec 2022 16:21:52 +0100
Subject: [PATCH] vimUtils.packdir: only include python3 if needed

`makeCustomizable` can be called on vim derivations that don't depend on
python, so avoid including python3 in the environment if there are no python3
dependencies.
---
 pkgs/applications/editors/vim/plugins/vim-utils.nix | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pkgs/applications/editors/vim/plugins/vim-utils.nix b/pkgs/applications/editors/vim/plugins/vim-utils.nix
index 09c5527cd0ec..c04176b22c7e 100644
--- a/pkgs/applications/editors/vim/plugins/vim-utils.nix
+++ b/pkgs/applications/editors/vim/plugins/vim-utils.nix
@@ -186,9 +186,9 @@ let
       depsOfOptionalPlugins = lib.subtractLists opt (findDependenciesRecursively opt);
       startWithDeps = findDependenciesRecursively start;
       allPlugins = lib.unique (startWithDeps ++ depsOfOptionalPlugins);
-      python3Env = python3.withPackages (ps:
-        lib.flatten (builtins.map (plugin: (plugin.python3Dependencies or (_: [])) ps) allPlugins)
-      );
+      allPython3Dependencies = ps:
+        lib.flatten (builtins.map (plugin: (plugin.python3Dependencies or (_: [])) ps) allPlugins);
+      python3Env = python3.withPackages allPython3Dependencies;
 
       packdirStart = vimFarm "pack/${packageName}/start" "packdir-start" allPlugins;
       packdirOpt = vimFarm "pack/${packageName}/opt" "packdir-opt" opt;
@@ -201,7 +201,7 @@ let
         ln -s ${python3Env}/${python3Env.sitePackages} $out/pack/${packageName}/start/__python3_dependencies/python3
       '';
     in
-      [ packdirStart packdirOpt python3link ];
+      [ packdirStart packdirOpt ] ++ lib.optional (allPython3Dependencies python3.pkgs != []) python3link;
   in
     buildEnv {
       name = "vim-pack-dir";