lsp/presets: add option to use PATH julia instead of bundling

also changes docs under languages/julia

Author: Soliprem

modules/plugins/languages/julia.nix

@@ -51,12 +51,15 @@ in {
             The entirety of Julia is bundled with nvf, if you enable this
             option, since there is no way to provide only the LSP server.
 
-            If you want to avoid that, you have to change
-            {option}`vim.lsp.servers.julials.cmd` to use
-            the Julia binary in {env}`PATH`, and add the `LanguageServer`
-            package to Julia in your devshells.
+            Since the LSP server is a julia package that needs to be bundled
+            within a Julia binary, there is no way for us to provide only the
+            LSP server. By default, you'll just have to add the `LanguageServer`
+            package to Julia in your devshells (or general environment), and be
+            good to go.
 
-            Check the source file of this option for the full `cmd`.
+            If you want to have the entirety of Julia bundled within nvf, you can
+            change {option}`vim.lsp.servers.presets.julia-languageserver.usePathBin`
+            to `false` to have nvf bundle julia and the lsp.
             :::
           '';
         };

modules/plugins/lsp/presets/julia-languageserver.nix

@@ -7,13 +7,22 @@
   inherit (lib.meta) getExe;
   inherit (lib.modules) mkIf;
   inherit (lib.nvim.types) mkLspPresetEnableOption;
+  inherit (lib.nvim.config) mkBool;
   inherit (lib.generators) mkLuaInline;
   inherit (lib.nvim.dag) entryBefore;
 
   cfg = config.vim.lsp.presets.julia-languageserver;
+  julials_bin =
+    if cfg.usePathBin
+    then "julia"
+    else getExe (pkgs.julia-bin.withPackages ["LanguageServer"]);
 in {
   options.vim.lsp.presets.julia-languageserver = {
     enable = mkLspPresetEnableOption "julia-languageserver" "Julia" [];
+    usePathBin = mkBool false ''
+      use julia taken from PATH, instead of bundling it within nvf.
+      You'll need to add "LanguageServer" to your Julia instance for this to work
+    '';
   };
 
   config = mkIf cfg.enable {
@@ -23,7 +32,7 @@ in {
         root_markers = ["Project.toml" "JuliaProject.toml"];
         cmd = mkLuaInline ''
           {
-            '${getExe (pkgs.julia.withPackages ["LanguageServer"])}',
+            '${julials_bin}',
             '--startup-file=no',
             '--history-file=no',
             '-e',