Apps: re-enable LanguageTool

hosts/Khanda/default.nix

@@ -25,7 +25,13 @@ in
       office.enable = true;
       recording.enable = true;
       social.enable = true;
-      writing.enable = true;
+      writing = {
+        enable = true;
+        languagetool = {
+          enable = true;
+          ngrams.enable = true;
+        };
+      };
     };
 
     # Enable Secure Boot support.

modules/apps/writing.nix

@@ -10,7 +10,17 @@ let
 in
 {
   options = {
-    aux.system.apps.writing.enable = lib.mkEnableOption "Enables writing and editing tools";
+    aux.system.apps.writing = {
+      enable = lib.mkEnableOption "Enables writing and editing tools";
+
+      languagetool = {
+        enable = lib.mkEnableOption (lib.mdDoc "Enables local Language Tool server.");
+        # WARNING: Ngrams package requires a lot of RAM
+        ngrams.enable = lib.mkEnableOption (
+          lib.mdDoc "Enables ngrams for improved grammar detection (warning: results in an 8GB+ download)."
+        );
+      };
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -21,5 +31,17 @@ in
       haskellPackages.pandoc-crossref
       texliveSmall
     ];
+
+    # Spelling and grammer checking: hosted on localhost:8081
+    services.languagetool = lib.mkIf cfg.languagetool.enable {
+      enable = true;
+      port = 8090;
+      public = false;
+      allowOrigin = "*";
+      # Enable Ngrams
+      settings.languageModel = lib.mkIf cfg.languagetool.ngrams.enable "${
+        (pkgs.callPackage ../../packages/languagetool-ngrams.nix { inherit pkgs lib; })
+      }/ngrams";
+    };
   };
 }

modules/users/aires/default.nix

@@ -90,7 +90,7 @@ in
                 theme = "gentoo";
               };
               shellAliases = {
-                nos = lib.mkIf config.aux.system.nixos-upgrade-script.enable "nixos-upgrade-script";
+                nos = "nixos-upgrade-script";
                 z = "zellij";
                 update = "upgrade";
                 upgrade = "nh os boot --update --ask";

packages/languagetool-ngrams.nix

@@ -0,0 +1,33 @@
+# For a packaging example, see https://github.com/Janik-Haag/nix-languagetool-ngram/blob/main/ngram-template.nix
+{
+  pkgs,
+  lib,
+  fetchzip,
+}:
+
+pkgs.stdenv.mkDerivation rec {
+  pname = "languagetool-ngram-en";
+  version = "20150817";
+  language = "en";
+
+  src = fetchzip {
+    url = "https://languagetool.org/download/ngram-data/ngrams-${language}-${version}.zip";
+    sha256 = "10e548731d9f58189fc36a553f7f685703be30da0d9bb42d1f7b5bf5f8bb232c";
+  };
+
+  dontBuild = true;
+  dontConfigure = true;
+  dontFixup = true;
+
+  installPhase = ''
+    mkdir -p $out/share/languagetool/ngrams
+    ln -s $src $out/share/languagetool/ngrams/${language}
+  '';
+
+  meta = with lib; {
+    homepage = "https://dev.languagetool.org/finding-errors-using-n-gram-data.html";
+    description = "LanguageTool can make use of large n-gram data sets to detect errors with words that are often confused, like their and there.";
+    platforms = platforms.linux;
+    license = licenses.cc-by-sa-40;
+  };
+}