Enhancements

- Fixed word wrapping problem on "help" page.
- Writes errors to std::cout because std::cerr confuses tests.
  Presumably no users will care.  I don't.
- Added listDiff template function.

src/task.cpp

@@ -226,9 +226,9 @@ static std::string longUsage (Config& conf)
 {
   std::stringstream out;
   out << shortUsage (conf)
-      << "ID is the numeric identifier displayed by the 'task list' command." << "\n"
+      << "ID is the numeric identifier displayed by the 'task list' command. "
-      << "You can specify multiple IDs for task commands, and multiple tasks" << "\n"
+      << "You can specify multiple IDs for task commands, and multiple tasks "
-      << "will be affected.  To specify multiple IDs make sure you use one"   << "\n"
+      << "will be affected.  To specify multiple IDs make sure you use one "
       << "of these forms:"                                                    << "\n"
       << "  task delete 1,2,3"                                                << "\n"
       << "  task info 1-3"                                                    << "\n"
@@ -341,7 +341,7 @@ int main (int argc, char** argv)
 
   catch (std::string& error)
   {
-    std::cerr << error << std::endl;
+    std::cout << error << std::endl;
     return -1;
   }
 

src/task.h

@@ -90,8 +90,14 @@ std::string handleUndo (TDB&, T&, Config&);
 std::string handleColor (Config&);
 std::string handleAnnotate (TDB&, T&, Config&);
 T findT (int, const std::vector <T>&);
+int deltaAppend (T&, T&);
+int deltaDescription (T&, T&);
+int deltaTags (T&, T&);
+int deltaAttributes (T&, T&);
+int deltaSubstitutions (T&, T&);
 
 // report.cpp
+void filterSequence (std::vector<T>&, T&);
 void filter (std::vector<T>&, T&);
 std::string handleInfo (TDB&, T&, Config&);
 std::string handleCompleted (TDB&, T&, Config&);
@@ -151,4 +157,45 @@ void autoColorize (T&, Text::color&, Text::color&, Config&);
 // import.cpp
 std::string handleImport (TDB&, T&, Config&);
 
+// list template
+///////////////////////////////////////////////////////////////////////////////
+template <class T> void listDiff (
+  const T& left, const T& right, T& leftOnly, T& rightOnly)
+{
+  leftOnly.clear ();
+  rightOnly.clear ();
+
+  for (unsigned int l = 0; l < left.size (); ++l)
+  {
+    bool found = false;
+    for (unsigned int r = 0; r < right.size (); ++r)
+    {
+      if (left[l] == right[r])
+      {
+        found = true;
+        break;
+      }
+    }
+
+    if (!found)
+      leftOnly.push_back (left[l]);
+  }
+
+  for (unsigned int r = 0; r < right.size (); ++r)
+  {
+    bool found = false;
+    for (unsigned int l = 0; l < left.size (); ++l)
+    {
+      if (left[l] == right[r])
+      {
+        found = true;
+        break;
+      }
+    }
+
+    if (!found)
+      rightOnly.push_back (right[r]);
+  }
+}
+
 ////////////////////////////////////////////////////////////////////////////////