Added output of number of tasks to be modified in batch mode

src/commands/CmdAnnotate.cpp

@@ -70,6 +70,9 @@ int CmdAnnotate::execute (std::string&)
   // Accumulated project change notifications.
   std::map <std::string, std::string> projectChanges;
 
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdAppend.cpp

@@ -70,6 +70,9 @@ int CmdAppend::execute (std::string&)
   // Accumulated project change notifications.
   std::map <std::string, std::string> projectChanges;
 
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdDelete.cpp

@@ -72,6 +72,9 @@ int CmdDelete::execute (std::string&)
   // Accumulated project change notifications.
   std::map <std::string, std::string> projectChanges;
 
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdDenotate.cpp

@@ -87,6 +87,9 @@ int CmdDenotate::execute (std::string&)
   // Accumulated project change notifications.
   std::map <std::string, std::string> projectChanges;
 
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdDone.cpp

@@ -69,6 +69,10 @@ int CmdDone::execute (std::string&)
   std::map <std::string, std::string> projectChanges;
 
   Task& lowest = filtered.front();
+
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdModify.cpp

@@ -71,6 +71,9 @@ int CmdModify::execute (std::string&)
   std::map <std::string, std::string> projectChanges;
 
   auto count = 0;
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdPrepend.cpp

@@ -70,6 +70,9 @@ int CmdPrepend::execute (std::string&)
   // Accumulated project change notifications.
   std::map <std::string, std::string> projectChanges;
 
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     Task before (task);

src/commands/CmdStart.cpp

@@ -69,6 +69,9 @@ int CmdStart::execute (std::string&)
   std::map <std::string, std::string> projectChanges;
 
   bool nagged = false;
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     if (! task.has ("start"))

src/commands/CmdStop.cpp

@@ -67,6 +67,9 @@ int CmdStop::execute (std::string&)
   // Accumulated project change notifications.
   std::map <std::string, std::string> projectChanges;
 
+  if(filtered.size() > 1) {
+    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+  }
   for (auto& task : filtered)
   {
     if (task.has ("start"))