From 264855146ce619d73fb422b757fa66a937b4a556 Mon Sep 17 00:00:00 2001
From: Lucas Hoffmann <lucc@posteo.de>
Date: Sun, 4 May 2025 08:36:03 +0200
Subject: [PATCH 1/2] wrapNeovimUnstable: do not generate empty init.vim file

The concatStringsSep function will always return a string so the check
was actually wrong.
---
 pkgs/applications/editors/neovim/wrapper.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/applications/editors/neovim/wrapper.nix b/pkgs/applications/editors/neovim/wrapper.nix
index 97c7409404b6..d3bc6f347081 100644
--- a/pkgs/applications/editors/neovim/wrapper.nix
+++ b/pkgs/applications/editors/neovim/wrapper.nix
@@ -119,7 +119,7 @@ let
           ''
             ${luaRcContent}
           ''
-          + lib.optionalString (neovimRcContent' != null) ''
+          + lib.optionalString (neovimRcContent' != "") ''
             vim.cmd.source "${writeText "init.vim" neovimRcContent'}"
           ''
           + lib.concatStringsSep "\n" luaPluginRC;

From 7102d2f9e2d46e11503547d17a98a9e051e386e1 Mon Sep 17 00:00:00 2001
From: Lucas Hoffmann <lucc@posteo.de>
Date: Thu, 8 May 2025 20:40:17 +0200
Subject: [PATCH 2/2] neovim.tests: add a check that init.vim is not build if
 not needed

---
 .../applications/editors/neovim/tests/default.nix | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/pkgs/applications/editors/neovim/tests/default.nix b/pkgs/applications/editors/neovim/tests/default.nix
index 42ca99ea2aa8..06818b5680b3 100644
--- a/pkgs/applications/editors/neovim/tests/default.nix
+++ b/pkgs/applications/editors/neovim/tests/default.nix
@@ -260,6 +260,21 @@ pkgs.recurseIntoAttrs (rec {
     [ "$result" = 0 ]
   '';
 
+  # Generate a neovim wrapper with only a init.lua and no init.vim file
+  nvim_with_only_init_lua = wrapNeovim2 "-only-lua-init-file" {
+    luaRcContent = "-- some text";
+  };
+
+  # check that we do not generate an init.vim file if it is not needed
+  no_init_vim_file = runTest nvim_with_only_init_lua ''
+    ${nvim_with_only_init_lua}/bin/nvim -i NONE -e --headless -c 'if len(getscriptinfo({"name":"init.vim"})) == 0 | quit | else | cquit | fi'
+    # This does now work because the lua file is sourced via loadfile() which
+    # does not add the file name to :scriptnames and getscriptinfo().
+    #${nvim_with_only_init_lua}/bin/nvim -i NONE -e --headless -c 'if len(getscriptinfo({"name":"init.lua"})) == 1 | quit | else | cquit | fi'
+
+    assertFileRegex ${nvim_with_only_init_lua}/bin/nvim 'VIMINIT=.*init.lua'
+  '';
+
   # check that the vim-doc hook correctly generates the tag
   # we know for a fact packer has a doc folder
   checkForTags = vimPlugins.packer-nvim.overrideAttrs (oldAttrs: {