Don't show message "Running <tool> ..." when there is nothing to run

Author: doxygen

src/dot.h

@@ -36,6 +36,7 @@ class DotManager
     static DotManager *instance();
     void addJob(const DotJob &newJob);
     DotFilePatcher *createFilePatcher(const QCString &fileName);
+    bool needToRun() const { return m_jobs.size()+m_filePatchers.size()>0; }
     bool run();
 
   private:

src/doxygen.cpp

@@ -13418,15 +13418,21 @@ void generateOutput()
     g_s.end();
   }
 
-  g_s.begin("Running plantuml with JAVA...\n");
-  PlantumlManager::instance().run();
-  g_s.end();
+  if (PlantumlManager::instance().needToRun())
+  {
+    g_s.begin("Running plantuml with JAVA...\n");
+    PlantumlManager::instance().run();
+    g_s.end();
+  }
 
-  g_s.begin("Running mermaid (mmdc)...\n");
-  MermaidManager::instance().run();
-  g_s.end();
+  if (MermaidManager::instance().needToRun())
+  {
+    g_s.begin("Running mermaid (mmdc)...\n");
+    MermaidManager::instance().run();
+    g_s.end();
+  }
 
-  if (Config_getBool(HAVE_DOT))
+  if (Config_getBool(HAVE_DOT) && DotManager::instance()->needToRun())
   {
     g_s.begin("Running dot...\n");
     DotManager::instance()->run();

src/mermaid.h

@@ -48,6 +48,7 @@ class MermaidManager
 
     void setHasInlineDiagrams();
     bool hasInlineDiagrams() const { return m_hasInlineDiagrams; }
+    bool needToRun() const { return !m_diagrams.empty(); }
 
     /** Run mmdc tool for all collected diagrams */
     void run();

src/plantuml.h

@@ -45,6 +45,13 @@ class PlantumlManager
 
     static PlantumlManager &instance();
 
+    bool needToRun() const
+    {
+      return !m_pngPlantumlContent.empty() ||
+             !m_svgPlantumlContent.empty() ||
+             !m_epsPlantumlContent.empty();
+    }
+
     /** Run plant UML tool for all images */
     void run();