very basic eta

anki/sched.py

@@ -95,6 +95,25 @@ order by due""" % self._groupLimit(),
         self.deck.db.execute(
             "update cards set queue = type where queue between -3 and -2")
 
+    def etaStr(self):
+        eta = self.eta()
+        if not eta:
+            return ""
+        return fmtTimeSpan(eta)
+
+    def eta(self):
+        "A very rough estimate of time to review."
+        (cnt, sum) = self.deck.db.first("""
+select count(), sum(taken) from (select * from revlog
+order by time desc limit 100)""")
+        if not cnt:
+            return 0
+        avg = sum / float(cnt)
+        c = self.counts()
+        # Here we just assume new/lrn will require 3x the number of reviews. A
+        # more complex solution can be added in the future.
+        return (avg*c[0]*3 + avg*c[1]*3 + avg*c[2]) / 1000.0
+
     # Counts
     ##########################################################################
 

tests/test_sched.py

@@ -794,3 +794,15 @@ def test_resched():
     c.load()
     assert c.due == d.sched.today+1
     assert c.ivl == +1
+
+def test_eta():
+    d = getEmptyDeck()
+    f = d.newFact()
+    f['Front'] = u"one"
+    d.addFact(f)
+    d.reset()
+    c = d.sched.getCard()
+    time.sleep(0.1)
+    d.sched.answerCard(c, 1)
+    time.sleep(0.1)
+    d.sched.answerCard(c, 1)