add datacheck for invalid wikilink

fixes #13

acros/utils/checks/checks/acronym.py

@@ -2,6 +2,7 @@ from itertools import chain
 
 from acros.models import Acronym
 from acros.utils.checks import BaseCheck, CheckWarning, registry, CheckInfo
+from acros.utils.wikilinks import invalid_wikilink
 
 greek_codes = chain(range(0x370, 0x3e2), range(0x3f0, 0x400))
 greek_symbols = (chr(c) for c in greek_codes)
@@ -52,3 +53,16 @@ class FullNameCheck(BaseCheck):
 
 
 registry.register(FullNameCheck)
+
+
+class WikiLinkCheck(BaseCheck):
+    def run(self):
+        for acronym in Acronym.objects.all():
+            if invalid_wikilink in acronym.description_html:
+                yield CheckWarning(
+                    "invalid wikilink",
+                    obj=acronym
+                )
+
+
+registry.register(WikiLinkCheck)

acros/utils/wikilinks.py

@@ -18,9 +18,7 @@ from markdown.inlinepatterns import InlineProcessor
 
 from acros.models import Acronym
 
-
-def build_url(label, base, end):
-    return "".join([base, label, end])
+invalid_wikilink = "invalid wikilink"
 
 
 class WikiLinkExtension(Extension):
@@ -52,7 +50,10 @@ class WikiLinksInlineProcessor(InlineProcessor):
             acro = Acronym.objects.get(name=label)
         except Acronym.DoesNotExist:
             # TODO: Notify user of invalid acronym
-            return "", m.start(0), m.end(0)
+            span = etree.Element("span")
+            span.text = invalid_wikilink
+            span.set("style", "display:none")
+            return span, m.start(0), m.end(0)
         url = f"/acronym/{acro.slug}"
         a = etree.Element("a")
         a.text = label