Export - query

- Output from the query command is now optionally surrounded by [ ... ]
  to make this a syntactically correct JSON document.  This is off by
  default.
- Updated documents.

src/Config.cpp

@@ -97,6 +97,7 @@ std::string Config::defaults =
   "xterm.title=no                                 # Sets xterm title for some commands\n"
   "expressions=on                                 # Support for algebraic expressions\n"
   "patterns=on                                    # Support for regex patterns\n"
+  "json.array=off                                 # Enclose JSON output in [ ]\n"
   "\n"
   "# Dates\n"
   "dateformat=m/d/Y                               # Preferred input and display date format\n"

src/commands/CmdQuery.cpp

@@ -75,7 +75,13 @@ int CmdQuery::execute (std::string& output)
   // Note: "limit:" feature not supported.
   // TODO Why not?
 
+  // Is output contained within a JSON array?
+  bool json_array = context.config.getBoolean ("json.array");
+
   // Compose output.
+  if (json_array)
+    output += "[\n";
+
   for (task = filtered.begin (); task != filtered.end (); ++task)
   {
     if (task != filtered.begin ())
@@ -84,6 +90,9 @@ int CmdQuery::execute (std::string& output)
     output += task->composeJSON (true);
   }
 
+  if (json_array)
+    output += "\n]";
+
   output += "\n";
   return rc;
 }