Enhancement - completion

- Implemented _projects and _tags reports to assist with tab
  completion scripts.

src/Cmd.cpp

@@ -106,6 +106,8 @@ void Cmd::load ()
 {
   if (commands.size () == 0)
   {
+    commands.push_back ("_projects");
+    commands.push_back ("_tags");
     commands.push_back (context.stringtable.get (CMD_ADD,       "add"));
     commands.push_back (context.stringtable.get (CMD_APPEND,    "append"));
     commands.push_back (context.stringtable.get (CMD_ANNOTATE,  "annotate"));
@@ -182,7 +184,9 @@ void Cmd::allCustomReports (std::vector <std::string>& all) const
 // Commands that do not directly modify the data files.
 bool Cmd::isReadOnlyCommand ()
 {
-  if (command == context.stringtable.get (CMD_CALENDAR,  "calendar")  ||
+  if (command == "_projects"                                          ||
+      command == "_tags"                                              ||
+      command == context.stringtable.get (CMD_CALENDAR,  "calendar")  ||
       command == context.stringtable.get (CMD_COLORS,    "colors")    ||
       command == context.stringtable.get (CMD_EXPORT,    "export")    ||
       command == context.stringtable.get (CMD_HELP,      "help")      ||

src/Context.cpp

@@ -196,6 +196,8 @@ std::string Context::dispatch ()
   else if (cmd.command == "shell")         {       handleShell              (); }
 #endif
   else if (cmd.command == "undo")          {       handleUndo               (); }
+  else if (cmd.command == "_projects")     { out = handleCompletionProjects (); }
+  else if (cmd.command == "_tags")         { out = handleCompletionTags     (); }
   else if (cmd.command == "" &&
            sequence.size ())               { out = handleModify             (); }
 

src/command.cpp

@@ -193,6 +193,31 @@ std::string handleProjects ()
   return out.str ();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+std::string handleCompletionProjects ()
+{
+  std::vector <Task> tasks;
+  context.tdb.lock (context.config.get ("locking", true));
+  handleRecurrence ();
+  Filter filter;
+  context.tdb.loadPending (tasks, filter);
+  context.tdb.commit ();
+  context.tdb.unlock ();
+
+  // Scan all the tasks for their project name, building a map using project
+  // names as keys.
+  std::map <std::string, int> unique;
+  foreach (t, tasks)
+    unique[t->get ("project")] = 0;
+
+  std::stringstream out;
+  foreach (project, unique)
+    if (project->first.length ())
+      out << project->first << std::endl;
+
+  return out.str ();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 std::string handleTags ()
 {
@@ -260,6 +285,36 @@ std::string handleTags ()
   return out.str ();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+std::string handleCompletionTags ()
+{
+  std::vector <Task> tasks;
+  context.tdb.lock (context.config.get ("locking", true));
+  handleRecurrence ();
+  Filter filter;
+  context.tdb.loadPending (tasks, filter);
+  context.tdb.commit ();
+  context.tdb.unlock ();
+
+  // Scan all the tasks for their project name, building a map using project
+  // names as keys.
+  std::map <std::string, int> unique;
+  foreach (t, tasks)
+  {
+    std::vector <std::string> tags;
+    t->getTags (tags);
+
+    foreach (tag, tags)
+      unique[*tag] = 0;
+  }
+
+  std::stringstream out;
+  foreach (tag, unique)
+    out << tag->first << std::endl;
+
+  return out.str ();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void handleUndo ()
 {

src/main.h

@@ -60,7 +60,9 @@ std::string handleExport ();
 std::string handleDone ();
 std::string handleModify ();
 std::string handleProjects ();
+std::string handleCompletionProjects ();
 std::string handleTags ();
+std::string handleCompletionTags ();
 std::string handleVersion ();
 std::string handleDelete ();
 std::string handleStart ();