feat: add separate neovim config for manpager use

modules/optional/dev/default.nix

@@ -1,9 +1,10 @@
-{...}: {
+{pkgs, ...}: {
   imports = [
     ./documentation.nix
     ./yubikey.nix
   ];
 
+  environment.systemPackages = [pkgs.man-pages pkgs.man-pages-posix];
   environment.enableDebugInfo = true;
   services.nixseparatedebuginfod.enable = true;
 }

users/modules/config/manpager/default.nix

@@ -0,0 +1,14 @@
+{pkgs, ...}: let
+  nvimPager = pkgs.wrapNeovimUnstable pkgs.neovim-unwrapped nvimConfig;
+  nvimConfig =
+    pkgs.neovimUtils.makeNeovimConfig {
+      wrapRc = false;
+      withPython3 = false;
+      withRuby = false;
+    }
+    // {
+      wrapperArgs = ["--add-flags" "--clean -u ${./init.lua}"];
+    };
+in {
+  home.sessionVariables.MANPAGER = "${nvimPager}/bin/nvim '+Man!'";
+}

users/modules/config/manpager/init.lua

@@ -0,0 +1,11 @@
+vim.opt.buftype = "nowrite"
+vim.opt.backup = false
+vim.opt.modeline = false
+vim.opt.shelltemp = false
+vim.opt.swapfile = false
+vim.opt.undofile = false
+vim.opt.writebackup = false
+vim.opt.shadafile = vim.fn.stdpath "state" .. "/shada/man.shada"
+
+-- Make sure to use ANSI colors
+vim.opt.termguicolors = false

users/modules/default.nix

@@ -5,6 +5,7 @@
 
     ./config/htop.nix
     ./config/impermanence.nix
+    ./config/manpager
     ./config/neovim.nix
     ./config/shell
     ./config/utils.nix

users/myuser/dev/default.nix

@@ -5,7 +5,7 @@
   ];
 
   home = {
-    extraOutputsToInstall = ["doc" "devdoc"];
+    extraOutputsToInstall = ["man" "doc" "devdoc"];
     packages = with pkgs; [
       git-lfs
       d2

users/myuser/graphical/default.nix

@@ -37,6 +37,8 @@
       zathura
     ];
 
+    # TODO neovim directtly opening file has different syntax
+    # TODO neovim reopening file should continue at the previous position
     # TODO thunderbird doesn't use passwords from password command
     # TODO rotating wallpaper
     # TODO thunderbird date time format is wrong even though this is C.utf8