fix: usr: fixed error with external plantuml server (fixes #61)

When using an external PlantUML server to render diagrams, if a diagram
has syntax errors and the remote server returns an error code (HTTP >=
400), and exception was thrown immediatly stopping markdown parsing.
Now the error is intercepted and logged, and markdown can continue its
work.

plantuml_markdown.py

@@ -65,6 +65,7 @@
 import logging
 import markdown
 import uuid
+import requests
 from markdown.util import AtomicString
 from xml.etree import ElementTree as etree
 
@@ -314,7 +315,13 @@ def _render_local_uml_map(plantuml_code, img_format):
             return out
 
     def _render_remote_uml_image(self, plantuml_code, img_format):
-        return PlantUML("%s/%s/" % (self.config['server'], img_format)).processes(plantuml_code)
+        image_url = PlantUML("%s/%s/" % (self.config['server'], img_format)).get_url(plantuml_code)
+        # download manually the image to be able to continue in case of errors
+        with requests.get(image_url) as r:
+            if r.status_code >= 400:
+                print('WARNING in "uml" directive: remote server has returned error %d' % r.status_code)
+
+            return r.content
 
 
 # For details see https://pythonhosted.org/Markdown/extensions/api.html#extendmarkdown

requirements.txt

@@ -1,2 +1,3 @@
 Markdown
 plantuml
+requests

setup.py

@@ -15,7 +15,7 @@
 
 setuptools.setup(
     name="plantuml-markdown",
-    version="3.5.1",
+    version="3.5.2",
     author="Michele Tessaro",
     author_email="[email protected]",
     description="A PlantUML plugin for Markdown",