How to use

getIndentSize

method

in

com.intellij.psi.codeStyle.CodeStyleSettings

CodeStyleSettings settings = proj == null ? CodeStyle.getDefaultSettings() : CodeStyle.getSettings(proj);
tabSize = settings.getTabSize(type);
indentSize = settings.getIndentSize(type);
useTabs = settings.useTabCharacter(type);

 private static LookupElement createKeywordLookupItem(String keyword) {
  LookupElementBuilder builder = LookupElementBuilder.create(keyword.toLowerCase()).withCaseSensitivity(false).bold();
  boolean braces = keyword.endsWith("{") || keyword.endsWith("}");
  if (!braces) {
   return keyword.startsWith("%") ? TailTypeDecorator.withTail(builder, TailType.SPACE) : builder;
  }
  else {
   final String closing = keyword.endsWith("{") ? keyword.substring(0, keyword.length()-1) + "}" : null;
   return PrioritizedLookupElement.withPriority(builder.withInsertHandler((context, item) -> {
    int caret = context.getTailOffset();
    Document document = context.getDocument();
    StringBuilder sb = new StringBuilder("\n");
    caret += sb.length();
    if (closing != null) {
     int indentSize = CodeStyleSettingsManager.getInstance(context.getProject()).
      getCurrentSettings().getIndentSize(JFlexFileType.INSTANCE);
     sb.append(StringUtil.repeat(" ", indentSize));
     caret += indentSize;
     sb.append("\n").append(closing).append("\n");
    }
    document.insertString(context.getTailOffset(), sb);
    context.getEditor().getCaretModel().moveToOffset(caret);
   }), 1.d / keyword.length());
  }
 }
}