LanguageTool: prevent input of multiple language codes

install/languagetool-install.sh

@@ -27,8 +27,32 @@ mv /opt/LanguageTool-*/ /opt/LanguageTool/
 download_file "https://dl.fbaipublicfiles.com/fasttext/supervised-models/lid.176.bin" /opt/lid.176.bin
 msg_ok ""
 
-read -r -p "${TAB3}Enter language code (en, de, es, fr, nl) to download ngrams or press ENTER to skip: " lang_code
 ngram_dir=""
+lang_code=""
+max_attempts=3
+attempt=0
+
+while [[ $attempt -lt $max_attempts ]]; do
+  read -r -p "${TAB3}Enter language code (en, de, es, fr, nl) to download ngrams or press ENTER to skip: " lang_code
+
+  if [[ -z "$lang_code" ]]; then
+    break
+  fi
+
+  if [[ "$lang_code" =~ [[:space:]] ]]; then
+    ((attempt++))
+    remaining=$((max_attempts - attempt))
+    if [[ $remaining -gt 0 ]]; then
+      msg_error "Please enter only ONE language code. You have $remaining attempt(s) remaining."
+    else
+      msg_error "Maximum attempts reached. Continuing without ngrams."
+      lang_code=""
+    fi
+    continue
+  fi
+  break
+done
+
 if [[ -n "$lang_code" ]]; then
   if [[ "$lang_code" =~ ^(en|de|es|fr|nl)$ ]]; then
     msg_info "Searching for $lang_code ngrams..."