feat(neovim)!: pull flake information from envvar

This makes so we don't have to rely on writing an extra derivation just
for the parsed lsp configuration.

Thus, the `programs.neovim.nixd.hostname` settings has been dropped and
you can migrate your `programs.neovim.nixd.location` to
`programs.neovim.flakePath` if you do not set the `FLAKE` envvar
anywhere.

modules/neovim/README.md

@@ -4,16 +4,14 @@ The module extends `programs.neovim`.
 
 ## Module options
 
-### programs.neovim.nixd.hostname
-
-By default [nixd] is enabled, you **need** to pass the current machine's
-hostname that is used to generate your system.
-
-### programs.neovim.nixd.location
+### programs.neovim.flakePath
 
 The location of your system's flake, [nixd] will execute an expression defined in the LSP's configuration that reads
 the flake's contents to evaluate [NixOS] and [Home Manager] options.
 
+This setting is optional since other programs might force you to set the `FLAKE` environment variable; if this is not
+set by the time you open [neovim] it will spout an error, impeding critical plugins from starting.
+
 ### programs.neovim.ollama.enable
 
 Whether to add an [ollama] package to be used with [ollama.nvim](https://github.com/nomnivore/ollama.nvim).

modules/neovim/default.nix

@@ -25,20 +25,11 @@ let
 in
 {
   options.programs.neovim = {
-    nixd = {
-      hostname = mkOption {
-        default = "wizdesk";
-        description = "Your NixOS hostname, needed for nixd lsp.";
-        example = "nixos";
-        type = types.str;
-      };
-
-      location = mkOption {
-        default = "git+file:///home/wizardlink/.system";
-        description = "Path to your flake location, prepend 'file:///' to it and 'git+' before that if using git.";
-        example = "git+file:///home/wizardlink/.system";
-        type = types.str;
-      };
+    flakePath = mkOption {
+      default = null;
+      description = "The path to your flake, this will be the value of the `FLAKE` environment variable.";
+      example = "~/.config/nix";
+      type = types.nullOr types.str;
     };
 
     ollama = {
@@ -57,10 +48,14 @@ in
   };
 
   config = {
-    home.sessionVariables = {
-      EDITOR = "nvim";
-      MANPAGER = "nvim +Man!";
-    };
+    home.sessionVariables =
+      {
+        EDITOR = "nvim";
+        MANPAGER = "nvim +Man!";
+      }
+      // lib.optionalAttrs (config.programs.neovim.flakePath != null) {
+        FLAKE = config.programs.neovim.flakePath;
+      };
 
     programs.neovim = {
       withNodeJs = true;
@@ -157,14 +152,6 @@ in
       source = ./ftplugin;
     };
 
-    xdg.configFile."nvim/lua/plugins/astrolsp.lua".source = pkgs.runCommand "astrolsp.lua" { } ''
-      cp ${./lsp.lua} $out
-
-      substituteInPlace $out \
-        --replace-fail "{hostname}" "${config.programs.neovim.nixd.hostname}" \
-        --replace-fail "{location}" "${config.programs.neovim.nixd.location}"
-    '';
-
     xdg.dataFile."nvim/lazy/blink.cmp/target/release/libblink_cmp_fuzzy.so" = {
       recursive = true;
       source = "${blink-cmp.packages.${pkgs.system}.blink-fuzzy-lib}/lib/libblink_cmp_fuzzy.so";

modules/neovim/lua/plugins/astrolsp.lua

@@ -9,6 +9,9 @@ return {
   ---@param opts AstroLSPOpts
   ---@return AstroLSPOpts
   opts = function(_, opts)
+    local system_flake_path = vim.fn.getenv "FLAKE" or error "FLAKE environment variable must be set."
+    local hostname = vim.fn.hostname()
+
     ---@type AstroLSPOpts
     local lsp_options = {
       -- Configuration table of features provided by AstroLSP
@@ -84,15 +87,23 @@ return {
           settings = {
             nixd = {
               nixpkgs = {
-                expr = "import (builtins.getFlake ({location})).inputs.nixpkgs { }",
+                expr = "import (builtins.getFlake (" .. system_flake_path .. ")).inputs.nixpkgs { }",
               },
               options = {
                 nixos = {
-                  expr = '(builtins.getFlake ("{location}")).nixosConfigurations.{hostname}.options',
+                  expr = "(builtins.getFlake ("
+                      .. system_flake_path
+                      .. ")).nixosConfigurations."
+                      .. hostname
+                      .. ".options",
                 },
                 home_manager = {
-                  expr =
-                  '(builtins.getFlake ("{location}")).nixosConfigurations.{hostname}.options.home-manager.users.type.getSubOptions []',
+                  expr = "(builtins.getFlake ("
+                      .. system_flake_path
+                      .. ")).nixosConfigurations."
+                      .. hostname
+                      .. ".options"
+                      .. ".home-manager.users.type.getSubOptions []",
                 },
               },
             },

modules/template/home-manager.nix

@@ -85,14 +85,6 @@
   # Let Home Manager install and manage itself.
   programs.home-manager.enable = true;
 
-  programs.neovim = {
-    # Enable Neovim, pre-configured by `linuxware`.
-    enable = true;
-
-    # Configure nixd
-    nixd = {
-      hostname = "your-hostname-here";
-      location = "your-flake-location-here";
-    };
-  };
+  # Enable Neovim, pre-configured by `linuxware`.
+  programs.neovim.enable = true;
 }