Use nullptr instead lf C-styled NULL

src/commands/CmdCalendar.cpp

@@ -122,12 +122,12 @@ int CmdCalendar::execute (std::string& output)
 
     // YYYY.
     else if (Lexer::isAllDigits (arg) && arg.length () == 4)
-      argYear = strtol (arg.c_str (), NULL, 10);
+      argYear = strtol (arg.c_str (), nullptr, 10);
 
     // MM.
     else if (Lexer::isAllDigits (arg) && arg.length () <= 2)
     {
-      argMonth = strtol (arg.c_str (), NULL, 10);
+      argMonth = strtol (arg.c_str (), nullptr, 10);
       if (argMonth < 1 || argMonth > 12)
         throw format ("Argument '{1}' is not a valid month.", arg);
     }
@@ -565,7 +565,7 @@ std::string CmdCalendar::renderMonths (
                 task.has ("due"))
             {
               std::string due = task.get ("due");
-              Datetime duedmy (strtol (due.c_str(), NULL, 10));
+              Datetime duedmy (strtol (due.c_str(), nullptr, 10));
 
               if (duedmy.day   () == d           &&
                   duedmy.month () == months[mpl] &&

src/commands/CmdDiagnostics.cpp

@@ -211,9 +211,9 @@ int CmdDiagnostics::execute (std::string& output)
   char* peditor;
   if (Context::getContext ().config.get ("editor") != "")
     out << "  rc.editor: " << Context::getContext ().config.get ("editor") << '\n';
-  else if ((peditor = getenv ("VISUAL")) != NULL)
+  else if ((peditor = getenv ("VISUAL")) != nullptr)
     out << "    $VISUAL: " << peditor << '\n';
-  else if ((peditor = getenv ("EDITOR")) != NULL)
+  else if ((peditor = getenv ("EDITOR")) != nullptr)
     out << "    $EDITOR: " << peditor << '\n';
 
   out << "     Server: "

src/commands/CmdEdit.cpp

@@ -250,7 +250,7 @@ std::string CmdEdit::formatTask (Task task, const std::string& dateformat)
 
   for (auto& anno : task.getAnnotations ())
   {
-    Datetime dt (strtol (anno.first.substr (11).c_str (), NULL, 10));
+    Datetime dt (strtol (anno.first.substr (11).c_str (), nullptr, 10));
     before << "  Annotation:        " << dt.toString (dateformat)
            << " -- "                  << json::encode (anno.second) << '\n';
   }
@@ -653,7 +653,7 @@ void CmdEdit::parseTask (Task& task, const std::string& after, const std::string
     if (dep.length () >= 7)
       task.addDependency (dep);
     else
-      task.addDependency ((int) strtol (dep.c_str (), NULL, 10));
+      task.addDependency ((int) strtol (dep.c_str (), nullptr, 10));
   }
 
   // UDAs

src/commands/CmdInfo.cpp

@@ -244,7 +244,7 @@ int CmdInfo::execute (std::string& output)
     auto created = task.get ("entry");
     if (created.length ())
     {
-      Datetime dt (strtol (created.c_str (), NULL, 10));
+      Datetime dt (strtol (created.c_str (), nullptr, 10));
       age = Duration (now - dt).formatVague ();
     }
 
@@ -560,7 +560,7 @@ int CmdInfo::execute (std::string& output)
           {
             int row = journal.addRow ();
 
-            Datetime timestamp (strtol (undo[when].substr (5).c_str (), NULL, 10));
+            Datetime timestamp (strtol (undo[when].substr (5).c_str (), nullptr, 10));
             journal.set (row, 0, timestamp.toString (dateformat));
 
             Task before (undo[previous].substr (4));

src/commands/CmdModify.h

@@ -37,11 +37,11 @@ public:
   int execute (std::string&);
   void checkConsistency (Task &before, Task &after);
   int modifyAndUpdate (Task &before, Task &after,
-    std::map <std::string, std::string> *projectChanges = NULL);
+    std::map <std::string, std::string> *projectChanges = nullptr);
   int modifyRecurrenceSiblings (Task &task,
-    std::map <std::string, std::string> *projectChanges = NULL);
+    std::map <std::string, std::string> *projectChanges = nullptr);
   int modifyRecurrenceParent (Task &task,
-    std::map <std::string, std::string> *projectChanges = NULL);
+    std::map <std::string, std::string> *projectChanges = nullptr);
 };
 
 #endif

src/commands/CmdStats.cpp

@@ -89,7 +89,7 @@ int CmdStats::execute (std::string& output)
   filter.subset (all, filtered);
 
   Datetime now;
-  time_t earliest   = time (NULL);
+  time_t earliest   = time (nullptr);
   time_t latest     = 1;
   int totalT        = 0;
   int deletedT      = 0;
@@ -123,13 +123,13 @@ int CmdStats::execute (std::string& output)
     if (task.is_blocked)  ++blockedT;
     if (task.is_blocking) ++blockingT;
 
-    time_t entry = strtol (task.get ("entry").c_str (), NULL, 10);
+    time_t entry = strtol (task.get ("entry").c_str (), nullptr, 10);
     if (entry < earliest) earliest = entry;
     if (entry > latest)   latest   = entry;
 
     if (status == Task::completed)
     {
-      time_t end = strtol (task.get ("end").c_str (), NULL, 10);
+      time_t end = strtol (task.get ("end").c_str (), nullptr, 10);
       daysPending += (end - entry) / 86400.0;
     }
 

src/commands/CmdSummary.cpp

@@ -80,7 +80,7 @@ int CmdSummary::execute (std::string& output)
   std::map <std::string, int> countCompleted;
   std::map <std::string, double> sumEntry;
   std::map <std::string, int> counter;
-  time_t now = time (NULL);
+  time_t now = time (nullptr);
 
   // Initialize counters.
   for (auto& project : allProjects)
@@ -108,7 +108,7 @@ int CmdSummary::execute (std::string& output)
       {
         ++countPending[parent];
 
-        time_t entry = strtol (task.get ("entry").c_str (), NULL, 10);
+        time_t entry = strtol (task.get ("entry").c_str (), nullptr, 10);
         if (entry)
           sumEntry[parent] = sumEntry[parent] + (double) (now - entry);
       }
@@ -120,8 +120,8 @@ int CmdSummary::execute (std::string& output)
       {
         ++countCompleted[parent];
 
-        time_t entry = strtol (task.get ("entry").c_str (), NULL, 10);
-        time_t end   = strtol (task.get ("end").c_str (), NULL, 10);
+        time_t entry = strtol (task.get ("entry").c_str (), nullptr, 10);
+        time_t end   = strtol (task.get ("end").c_str (), nullptr, 10);
         if (entry && end)
           sumEntry[parent] = sumEntry[parent] + (double) (end - entry);
       }