Command - prepend

- Migrated handlePrepend to CmdPrepend.

src/commands/CmdPrepend.cpp

@@ -0,0 +1,132 @@
+////////////////////////////////////////////////////////////////////////////////
+// taskwarrior - a command line task list manager.
+//
+// Copyright 2006 - 2011, Paul Beckingham, Federico Hernandez.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <sstream>
+#include <Context.h>
+#include <Permission.h>
+#include <main.h>
+#include <CmdPrepend.h>
+
+extern Context context;
+
+////////////////////////////////////////////////////////////////////////////////
+CmdPrepend::CmdPrepend ()
+{
+  _keyword     = "prepend";
+  _usage       = "task prepend <IDs> [tags] [attrs] desc...";
+  _description = "Prepends more description to an existing task.";
+  _read_only   = false;
+  _displays_id = false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+int CmdPrepend::execute (const std::string& command_line, std::string& output)
+{
+  if (!context.task.has ("description"))
+    throw std::string ("Additional text must be provided.");
+
+  int rc = 0;
+  int count = 0;
+  std::stringstream out;
+
+  std::vector <Task> tasks;
+  context.tdb.lock (context.config.getBoolean ("locking"));
+  Filter filter;
+  context.tdb.loadPending (tasks, filter);
+
+  // Filter sequence.
+  std::vector <Task> all = tasks;
+  context.filter.applySequence (tasks, context.sequence);
+  if (tasks.size () == 0)
+  {
+    context.footnote ("No tasks specified.");
+    return 1;
+  }
+
+  Permission permission;
+  if (context.sequence.size () > (size_t) context.config.getInteger ("bulk"))
+    permission.bigSequence ();
+
+  std::vector <Task>::iterator task;
+  for (task = tasks.begin (); task != tasks.end (); ++task)
+  {
+    std::vector <Task>::iterator other;
+    for (other = all.begin (); other != all.end (); ++other)
+    {
+      if (other->id             == task->id               || // Self
+          (task->has ("parent") &&
+           task->get ("parent") == other->get ("parent")) || // Sibling
+          other->get ("uuid")   == task->get ("parent"))     // Parent
+      {
+        Task before (*other);
+
+        // A non-zero value forces a file write.
+        int changes = 0;
+
+        // Apply other deltas.
+        changes += deltaPrepend (*other);
+        changes += deltaTags (*other);
+        changes += deltaAttributes (*other);
+        changes += deltaSubstitutions (*other);
+
+        if (taskDiff (before, *other))
+        {
+          // Only allow valid tasks.
+          other->validate ();
+
+          if (changes && permission.confirmed (before, taskDifferences (before, *other) + "Are you sure?"))
+          {
+            context.tdb.update (*other);
+
+            if (context.config.getBoolean ("echo.command"))
+              out << "Prepended '"
+                  << context.task.get ("description")
+                  << "' to task "
+                  << other->id
+                  << ".\n";
+
+            if (before.get ("project") != other->get ("project"))
+              context.footnote (onProjectChange (before, *other));
+
+            ++count;
+          }
+        }
+      }
+    }
+  }
+
+  context.tdb.commit ();
+  context.tdb.unlock ();
+
+  if (context.config.getBoolean ("echo.command"))
+    out << "Prepended " << count << " task" << (count == 1 ? ".\n" : "s.\n");
+
+  output = out.str ();
+  return rc;
+}
+
+////////////////////////////////////////////////////////////////////////////////