improves chronological listing (year, month), adds test

pubs/commands/list_cmd.py

@@ -48,8 +48,8 @@ def command(conf, args):
         papers = [p for p in papers if p.docpath is None]
     if args.alphabetical:
         papers = sorted(papers, key=lambda p: p.citekey)
-    if args.chronological:
+    elif args.chronological:
-        papers = sorted(papers, key=lambda p: p.bibdata['year'])
+        papers = sorted(papers, key=lambda p: ('year' not in p.bibdata, p.bibdata.get('year'), p.bibdata.get('month'), date_added))
     else:
         papers = sorted(papers, key=date_added)
     if len(papers) > 0:

tests/bibexamples/noyear.bib

@@ -0,0 +1,5 @@
+@article{Doe_noyear,
+  title={About Assigning Timestamps to Research Articles},
+  author={Doe, John},
+  journal={Journal Example},
+}

tests/test_usecase.py

@@ -516,6 +516,28 @@ class TestList(DataCommandTestCase):
         self.assertEqual(0, len(outs[3].splitlines()))
         self.assertEqual(1, len(outs[4].splitlines()))
 
+    def test_list_chronological_order(self):
+        cmds = ['pubs init',
+                'pubs import data/',
+                'pubs list --chronological',
+                'pubs import bibexamples/noyear.bib',
+                'pubs list -C',
+
+                ]
+        data_chrono_correct = '[Einstein_1935] Einstein, A. et al. "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?" Physical Review (1935) \n' \
+                   '[Schrodinger_1935] Schrödinger, E. and Born, M. "Discussion of Probability Relations between Separated Systems" Mathematical Proceedings of the Cambridge Philosophical Society (1935) \n' \
+                   '[turing1950computing] Turing, Alan M "Computing machinery and intelligence" Mind (1950) \n' \
+                   '[Bell_1964] Bell, J. S. "On the Einstein Podolsky Rosen paradox" Physics Physique физика (1964) \n' \
+                   '[Page99] Page, Lawrence et al. "The PageRank Citation Ranking: Bringing Order to the Web." (1999) \n' \
+                   '[10.1371_journal.pone.0038236] Saunders, Caroline Lyon AND Chrystopher L. Nehaniv AND Joe "Interactive Language Learning by Robots: The Transition from Babbling to Word Forms" PLoS ONE (2012) \n' \
+                   '[10.1371_journal.pone.0063400] Ay, Georg Martius AND Ralf Der AND Nihat "Information Driven Self-Organization of Complex Robotic Behaviors" PLoS ONE (2013) \n' \
+                   '[Cesar2013] César, Jean "An amazing title" Nice Journal (2013) \n'
+        correct = [ data_chrono_correct,
+                   data_chrono_correct + '[Doe_noyear] Doe, John "About Assigning Timestamps to Research Articles" Journal Example \n'
+                   ]
+        outs = self.execute_cmds(cmds)
+        self.assertEqual(outs[2], correct[0])
+        self.assertEqual(outs[4], correct[1])
 
 class TestTag(DataCommandTestCase):