ProjectExplorer: Replace RunControl::producer

... by two more specialized canRun() / createMainWorker() functions
resulting in somewhat leaner code on the user side and paving the
way for introducing a RunWorkerFactory class intended to follow the
now-canonical way of having factories as members in the plugin pimpl.

Change-Id: Id6fc2043a340203f14ab0b896a8dfa1e298f58a6
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/projectexplorer/projectexplorer.cpp

@@ -2196,15 +2196,13 @@ void ProjectExplorerPluginPrivate::executeRunConfiguration(RunConfiguration *run
         }
     }
 
-    RunControl::WorkerCreator producer = RunControl::producer(runConfiguration, runMode);
 
-    QTC_ASSERT(producer, return);
     auto runControl = new RunControl(runMode);
     runControl->setRunConfiguration(runConfiguration);
 
     // A user needed interaction may have cancelled the run
     // (by example asking for a process pid or server url).
-    if (!producer(runControl)) {
+    if (!runControl->createMainWorker()) {
         delete runControl;
         return;
     }
@@ -2996,8 +2994,7 @@ bool ProjectExplorerPlugin::canRunStartupProject(Core::Id runMode, QString *whyN
     }
 
     // shouldn't actually be shown to the user...
-    RunControl::WorkerCreator producer = RunControl::producer(activeRC, runMode);
-    if (!producer) {
+    if (!RunControl::canRun(activeRC, runMode)) {
         if (whyNot)
             *whyNot = tr("Cannot run \"%1\".").arg(activeRC->displayName());
         return false;

src/plugins/projectexplorer/runcontrol.cpp

@@ -443,19 +443,25 @@ RunWorker *RunControl::createWorker(Core::Id id)
     return nullptr;
 }
 
-RunWorkerFactory::WorkerCreator RunControl::producer(RunConfiguration *runConfig, Core::Id runMode)
+bool RunControl::createMainWorker()
 {
-    const auto canRun = std::bind(&RunWorkerFactory::canRun, std::placeholders::_1, runConfig, runMode);
+    const auto canRun = std::bind(&RunWorkerFactory::canRun, std::placeholders::_1,
+                                  d->runConfiguration, d->runMode);
     const QList<RunWorkerFactory *> candidates = Utils::filtered(g_runWorkerFactories, canRun);
-
-    // This is legit, there might be combinations that cannot run.
-    if (candidates.empty())
-        return {};
+    // There might be combinations that cannot run. But that should have been checked
+    // with canRun below.
+    QTC_ASSERT(!candidates.empty(), return false);
 
     // There should be at most one top-level producer feeling responsible per combination.
     // Breaking a tie should be done by tightening the restrictions on one of them.
     QTC_CHECK(candidates.size() == 1);
-    return candidates.front()->producer();
+    return candidates.front()->producer()(this) != nullptr;
+}
+
+bool RunControl::canRun(RunConfiguration *runConfig, Core::Id runMode)
+{
+    const auto check = std::bind(&RunWorkerFactory::canRun, std::placeholders::_1, runConfig, runMode);
+    return Utils::contains(g_runWorkerFactories, check);
 }
 
 void RunControlPrivate::initiateStart()

src/plugins/projectexplorer/runcontrol.h

@@ -274,7 +274,8 @@ public:
         factory->addConstraint(constraint);
     }
 
-    static WorkerCreator producer(RunConfiguration *runConfiguration, Core::Id runMode);
+    bool createMainWorker();
+    static bool canRun(RunConfiguration *runConfig, Core::Id runMode);
 
 signals:
     void appendMessage(const QString &msg, Utils::OutputFormat format);

src/plugins/valgrind/callgrindtool.cpp

@@ -282,8 +282,7 @@ CallgrindTool::CallgrindTool()
         m_perspective.select();
         auto runControl = new RunControl(CALLGRIND_RUN_MODE);
         runControl->setRunConfiguration(runConfig);
-        if (auto creator = RunControl::producer(runConfig, CALLGRIND_RUN_MODE))
-            creator(runControl);
+        runControl->createMainWorker();
         const auto runnable = dlg.runnable();
         runControl->setRunnable(runnable);
         runControl->setDisplayName(runnable.executable);

src/plugins/valgrind/memchecktool.cpp

@@ -673,8 +673,7 @@ MemcheckTool::MemcheckTool()
         m_perspective.select();
         RunControl *rc = new RunControl(MEMCHECK_RUN_MODE);
         rc->setRunConfiguration(runConfig);
-        if (auto creator = RunControl::producer(runConfig, MEMCHECK_RUN_MODE))
-            creator(rc);
+        rc->createMainWorker();
         const auto runnable = dlg.runnable();
         rc->setRunnable(runnable);
         rc->setDisplayName(runnable.executable);