make wikilinks for journals all render in iso format

(very inefficient implementation for now)

app/db.py

@@ -57,6 +57,11 @@ class Node:
         # i.e. if two users contribute subnodes titled [[foo]], they both show up when querying node [[foo]].
         self.wikilink = wikilink
         self.uri = wikilink
+        # ensure wikilinks to journal entries are all shown in iso format
+        # (important to do it after self.uri = wikilink to avoid breaking
+        # links)
+        if util.is_journal(wikilink):
+            self.wikilink = util.canonical_wikilink(wikilink)
         self.url = '/node/' + self.uri
         self.subnodes = []
 

app/util.py

@@ -12,8 +12,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import re
+from dateparser import DateDataParser
+from functools import lru_cache
 
+
+@lru_cache(maxsize=None)
 def canonical_wikilink(wikilink):
+
+    if is_journal(wikilink):
+        try:
+            parser = DateDataParser(languages=['en'])
+            date = parser.get_date_data(wikilink).date_obj
+            new_wikilink = date.isoformat().split("T")[0] 
+            if "nov" in wikilink:
+                print(f'>> Journal! "{wikilink}" -> "{new_wikilink}"')
+            wikilink = new_wikilink 
+        except:
+            # TODO: if we add logging, maybe log that we couldn't parse a date here
+            pass
+
     # hack hack
     wikilink = (
         wikilink.lower()
@@ -25,7 +42,10 @@ def canonical_wikilink(wikilink):
     return wikilink
 
 
+
+@lru_cache(maxsize=None)
 def is_journal(wikilink):
+
     date_regexes = [
         # iso format
         '[0-9]{4}-[0-9]{2}-[0-9]{2}',
@@ -36,6 +56,9 @@ def is_journal(wikilink):
     ]
 
     # combine all the date regexes into one super regex
+    # TODO: it'd really be better to compile this regex once rather than on
+    # each request, but as the knuth would say premature optimization is the
+    # root of all evil, etc. etc.
     combined_date_regex = re.compile(f'^({"|".join(date_regexes)})$')
 
     return combined_date_regex.match(wikilink)

requirements.txt

@@ -20,3 +20,5 @@ webencodings==0.5.1
 Werkzeug==1.0.1
 WTForms==2.3.3
 zipp==3.4.0
+dateparser==1.0.0
+