Don't warn about --user-words in Tesseract 4.1 or later

src/ocrmypdf/_validation.py

@@ -253,10 +253,13 @@ def check_options_advanced(options):
             "--pdfa-image-compression argument has no effect when "
             "--output-type is not 'pdfa', 'pdfa-1', or 'pdfa-2'"
         )
-    if tesseract.v4(options.tesseract_env) and (
+    if not tesseract.has_user_words(options.tesseract_env) and (
         options.user_words or options.user_patterns
     ):
-        log.warning('Tesseract 4.x ignores --user-words, so this has no effect')
+        log.warning(
+            "Tesseract 4.0 ignores --user-words and --user-patterns, so these "
+            "arguments have no effect."
+        )
 
 
 def check_options_metadata(options):

src/ocrmypdf/exec/tesseract.py

@@ -88,6 +88,15 @@ def has_textonly_pdf(tesseract_env=None):
     return False
 
 
+def has_user_words(tesseract_env=None):
+    """Does Tesseract have --user-words capability?
+
+    Not available in 4.0, but available in 4.1. Also available in 3.x, but
+    we no longer support 3.x.
+    """
+    return version(tesseract_env) >= '4.1'
+
+
 def languages(tesseract_env=None):
     def lang_error(output):
         msg = (

tests/test_validation.py

@@ -81,8 +81,13 @@ def test_optimizing(caplog):
 
 
 def test_user_words(caplog):
-    vd.check_options_advanced(make_opts(user_words='foo'))
-    assert 'ignores --user-words' in caplog.text
+    with patch('ocrmypdf.exec.tesseract.version', return_value='4.0.0'):
+        vd.check_options_advanced(make_opts(user_words='foo'))
+        assert '4.0 ignores --user-words' in caplog.text
+    caplog.clear()
+    with patch('ocrmypdf.exec.tesseract.version', return_value='4.1.0'):
+        vd.check_options_advanced(make_opts(user_patterns='foo'))
+        assert '4.0 ignores --user-words' not in caplog.text
 
 
 def test_pillow_options():