Fix language tool jar missing in dev warning message

vendor/language_tool/lib/language_tool.ex

@@ -19,14 +19,14 @@ defmodule LanguageTool do
         end
       )
     else
-      empty_matches(lang, text)
+      empty_matches(lang, text, :unsupported_language)
     end
   catch
-    _ -> empty_matches(lang, text)
+    _ -> empty_matches(lang, text, :check_internal_error)
   end
 
-  defp empty_matches(lang, text) do
-    %{"error" => nil, "language" => lang, "matches" => [], "text" => text, "markups" => []}
+  defp empty_matches(lang, text, error) do
+    %{"error" => error, "language" => lang, "matches" => [], "text" => text, "markups" => []}
   end
 
   def available? do

vendor/language_tool/lib/language_tool/backend.ex

@@ -4,31 +4,37 @@ defmodule LanguageTool.Backend do
   require Logger
 
   def start(config) do
-    path = Application.app_dir(:accent, "priv/native")
+    if File.exists?(jar_file()) do
+      args = [
+        executable(),
+        "-cp",
+        jar_file(),
+        "com.mirego.accent.languagetool.AppKt",
+        "--languages",
+        Enum.join(config.languages, ",")
+      ]
 
-    args = [
-      executable(),
-      "-cp",
-      Path.join(path, "language-tool.jar"),
-      "com.mirego.accent.languagetool.AppKt",
-      "--languages",
-      Enum.join(config.languages, ",")
-    ]
+      args =
+        if Enum.any?(config.disabled_rule_ids) do
+          args ++ ["--disabledRuleIds", Enum.join(config.disabled_rule_ids, ",")]
+        else
+          args
+        end
 
-    args =
-      if Enum.any?(config.disabled_rule_ids) do
-        args ++ ["--disabledRuleIds", Enum.join(config.disabled_rule_ids, ",")]
-      else
-        args
-      end
-
-    {:ok, backend} = Exile.Process.start_link(args)
-    receive_ready?(backend)
-    backend
+      {:ok, backend} = Exile.Process.start_link(args)
+      receive_ready?(backend)
+      backend
+    else
+      Logger.warning("LanguageTool could not be started. Install JRE and build the jar in #{jar_file()} to enable it")
+    end
   end
 
   def available? do
-    !!executable()
+    !!executable() and File.exists?(jar_file())
+  end
+
+  defp jar_file do
+    Path.join(Application.app_dir(:accent, "priv/native"), "language-tool.jar")
   end
 
   defp executable do

vendor/language_tool/lib/language_tool/server.ex

@@ -46,12 +46,17 @@ defmodule LanguageTool.Server do
   end
 
   def handle_info(:init_server_process, state) do
-    backend = LanguageTool.Backend.start(state.config)
-    state = %{state | backend: backend}
+    case LanguageTool.Backend.start(state.config) do
+      nil ->
+        :persistent_term.put({:language_tool, :ready}, false)
+        {:noreply, state}
 
-    :persistent_term.put({:language_tool, :ready}, true)
+      backend ->
+        state = %{state | backend: backend}
+        :persistent_term.put({:language_tool, :ready}, true)
 
-    {:noreply, state}
+        {:noreply, state}
+    end
   end
 
   def handle_info(_message, state) do