Use image alt text if available

2 files changed, 14 insertions, 3 deletions

diff --git a/mammoth/conversion.py b/mammoth/conversion.py
index 5580925..635b57c 100644
--- a/mammoth/conversion.py
+++ b/mammoth/conversion.py
@@ -77,10 +77,14 @@ class DocumentConverter(object):
             output = io.BytesIO()
             base64.encode(image_bytes, output)
             encoded_src = output.getvalue().rstrip("\n")
-            
-        html_generator.self_closing("img", {
+        
+        attributes = {
             "src": "data:{0};base64,{1}".format(image.content_type, encoded_src)
-        })
+        }
+        if image.alt_text:
+            attributes["alt"] = image.alt_text
+            
+        html_generator.self_closing("img", attributes)
 
 
     def _convert_elements_to_html(self, elements, html_generator):
diff --git a/tests/conversion_tests.py b/tests/conversion_tests.py
index 8935bb5..5088288 100644
--- a/tests/conversion_tests.py
+++ b/tests/conversion_tests.py
@@ -124,5 +124,12 @@ def images_are_converted_to_img_tags_with_data_uri():
     assert_equal('<img src="data:image/png;base64,YWJj" />', result.value)
 
 
+@istest
+def images_have_alt_tags_if_available():
+    image = documents.image(alt_text="It's a hat", content_type="image/png", open=lambda: io.BytesIO("abc"))
+    result = convert_document_element_to_html(image)
+    assert_equal('<img src="data:image/png;base64,YWJj" alt="It\'s a hat" />', result.value)
+
+
 def _run_with_text(text):
     return documents.run(children=[documents.text(text)])