Added comments for clarification, unrelated to other changes.

src/crontablib/ctcron.cpp

@@ -122,6 +122,7 @@ CTCron::CTCron(const QString &crontabBinary, const struct passwd *userInfos, boo
 CTCron::CTCron()
     : d(new CTCronPrivate())
 {
+    // Empty constructor, new CTCronPrivate created.
 }
 
 bool CTCron::initializeFromUserInfos(const struct passwd *userInfos)
@@ -141,6 +142,7 @@ CTCron &CTCron::operator=(const CTCron &source)
         return *this;
     }
 
+    // Not sure when this would tigger.
     if (source.isSystemCron()) {
         qCDebug(KCM_CRON_LOG) << "Affect the system cron";
     }

src/crontablib/ctcron.h

@@ -206,6 +206,7 @@ protected:
 
     bool saveToFile(const QString &fileName);
 
+    // d probably stands for data.
     CTCronPrivate *const d;
 };
 

src/crontablib/cthost.cpp

@@ -77,7 +77,6 @@ CTHost::CTHost(const QString &cronBinary, CTInitializationError &ctInitializatio
 
         // delete currentUserPassword;
     }
-
     // Create the system cron table.
     createSystemCron();
 }
@@ -184,6 +183,7 @@ QString CTHost::createCTCron(const struct passwd *userInfos)
 
 CTCron *CTHost::findCurrentUserCron() const
 {
+    // Because multiple users may exist, return only the currently logged in user's cron in user cron mode.
     for (CTCron *ctCron : std::as_const(mCrons)) {
         if (ctCron->isCurrentUserCron()) {
             return ctCron;
@@ -196,6 +196,7 @@ CTCron *CTHost::findCurrentUserCron() const
 
 CTCron *CTHost::findSystemCron() const
 {
+    // Return the cron belonging to root.
     for (CTCron *ctCron : std::as_const(mCrons)) {
         if (ctCron->isMultiUserCron()) {
             return ctCron;

src/crontablib/cttask.cpp

@@ -59,7 +59,6 @@ CTTask::CTTask(const QString &tokenString, const QString &_comment, const QStrin
     int spacePos(tokStr.indexOf(QRegExp(QLatin1String("[ \t]"))));
     // If reboot bypass initialize functions so no keys selected in modify task
     if (!reboot) {
-        // qCDebug(KCM_CRON_LOG) << "Line : " << tokStr;
         minute.initialize(tokStr.mid(0, spacePos));
 
         while (isSpaceAt(tokStr, spacePos + 1)) {
@@ -91,6 +90,10 @@ CTTask::CTTask(const QString &tokenString, const QString &_comment, const QStrin
         dayOfWeek.initialize(tokStr.mid(0, spacePos));
     }
 
+    // Since it's a multiuser(system) task, the token contains the user login,
+    // and the command, separated by a tab (\t).
+    // The two need to subsequently be separated again.
+    // E.g. "root\tmy_test_script.sh"
     if (mSystemCrontab) {
         while (isSpaceAt(tokStr, spacePos + 1)) {
             spacePos++;
@@ -101,7 +104,6 @@ CTTask::CTTask(const QString &tokenString, const QString &_comment, const QStrin
     } else {
         userLogin = _userLogin;
     }
-
     command = tokStr.mid(spacePos + 1, tokStr.length() - 1);
     // remove leading whitespace
     while (command.indexOf(QRegExp(QLatin1String("[ \t]"))) == 0) {

src/tasksWidget.cpp

@@ -120,12 +120,14 @@ void TasksWidget::runTaskNow() const
 
 void TasksWidget::createTask()
 {
+    // Gather necessary data to combine it into a CTTask, opening the taskEditor dialog.
     auto task =
         new CTTask(QLatin1String(""), QLatin1String(""), crontabWidget()->currentCron()->userLogin(), crontabWidget()->currentCron()->isMultiUserCron());
 
     TaskEditorDialog taskEditorDialog(task, i18n("New Task"), crontabWidget());
     const int result = taskEditorDialog.exec();
 
+    // Signal that changes were made if the task was created, or clean up if not.
     if (result == QDialog::Accepted) {
         addTask(task);
         Q_EMIT taskModified(true);