From aa6b5dbfba94141515f552f8286592b9b969c1a6 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Mon, 10 Apr 2017 19:08:07 -0400
Subject: [PATCH] Recurrence: Added stubbed generateAllDueDates

---
 src/recur2.cpp | 57 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/src/recur2.cpp b/src/recur2.cpp
index 4feeea53f..49c110d61 100644
--- a/src/recur2.cpp
+++ b/src/recur2.cpp
@@ -263,7 +263,62 @@ static Datetime generateNextDueDate (
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-static void synthesizeTasks (const Task&)
+// Calculates the due date for a new instance N.
+static std::vector <Datetime> generateAllDueDates (const Task& templateTask)
+{
+  std::vector <Datetime> dueDates;
+
+  // Determine due date, recur period and until date.
+  Datetime due (templateTask.get_date ("due"));
+  context.debug ("    due " + due.toISOLocalExtended ());
+
+  auto recur = templateTask.get ("recur");
+  context.debug ("    recur " + recur);
+
+  auto lastN = std::max (1, templateTask.get_int ("last"));
+  context.debug (format ("    last {1}", lastN));
+
+  bool end_in_sight = false;
+  Datetime until;
+  if (templateTask.get ("until") != "")
+  {
+    until = Datetime (templateTask.get ("until"));
+    end_in_sight = true;
+    context.debug ("    until " + until.toISOLocalExtended ());
+  }
+
+  auto recurrence_limit = context.config.getInteger ("recurrence.limit");
+  context.debug (format ("    recurrence.limit {1}", recurrence_limit));
+  int recurrence_counter = 0;
+  Datetime now;
+
+  while (1)
+  {
+    Datetime nextDue = generateNextDueDate (due, recur, lastN);
+
+    // TODO Safety.
+    if (dueDates.size () && dueDates.back () == nextDue)
+      break;
+
+    // If nextDue > until, it means there are no more tasks to generate, so
+    // this templateTask is finished.
+    if (end_in_sight && nextDue > until)
+      break;
+
+    if (nextDue > now)
+      ++recurrence_counter;
+
+    if (recurrence_counter >= recurrence_limit)
+      break;
+
+    dueDates.push_back (nextDue);
+  }
+
+  return dueDates;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+static void synthesizeTasks (const Task& templateTask)
 {
   context.debug ("synthesizeTasks start");