First version with bugs and a button (to be changed to menu) of closing project.

addons/project/kateproject.cpp

@@ -73,6 +73,20 @@ bool KateProject::reload(bool force)
     return load(m_globalProject, force);
 }
 
+void KateProject::close(bool force)
+{
+    QVariantMap map = readProjectFile();
+
+    if (!map.isEmpty()) 
+    {
+        m_plugin->deleteProject(this);
+        m_globalProject.clear();
+        delete this;
+    }
+
+    load(m_globalProject, force);
+}
+
 /**
  * Read a JSON document from file.
  *

addons/project/kateproject.h

@@ -67,6 +67,13 @@ public:
      * @return success
      */
     bool reload(bool force = false);
+    
+    /**
+     * Try to close a project.
+     * @param force will enforce the worker to update files list and co even if the content of the file was not changed!
+     * @return success
+     */
+    void close(bool force = false);
 
     /**
      * Accessor to file name.

addons/project/kateprojectplugin.cpp

@@ -189,6 +189,22 @@ KateProject *KateProjectPlugin::projectForDir(QDir dir)
     return nullptr;
 }
 
+
+void KateProjectPlugin::deleteProject(KateProject *project)
+{
+    m_projects.removeOne(project);
+    for (KateProject *projectIterator : m_projects) 
+    {
+        if(project == projectIterator)
+        {
+            m_fileWatcher.removePath(QFileInfo(projectIterator->fileName()).canonicalPath());
+            delete projectIterator;
+        }
+    }
+}
+
+
+
 KateProject *KateProjectPlugin::projectForUrl(const QUrl &url)
 {
     if (url.isEmpty() || !url.isLocalFile()) {

addons/project/kateprojectplugin.h

@@ -58,6 +58,8 @@ public:
      * @return project or null if not openable
      */
     KateProject *projectForDir(QDir dir);
+    
+    void deleteProject(KateProject *project);
 
     /**
      * Search and open project that contains given url, if possible.

addons/project/kateprojectpluginview.cpp

@@ -75,10 +75,14 @@ KateProjectPluginView::KateProjectPluginView(KateProjectPlugin *plugin, KTextEdi
     m_reloadButton = new QToolButton(m_toolView);
     m_reloadButton->setAutoRaise(true);
     m_reloadButton->setIcon(QIcon::fromTheme(QStringLiteral("view-refresh")));
+    m_closeProjectButton = new QToolButton(m_toolView);
+    m_closeProjectButton->setAutoRaise(true);
+    m_closeProjectButton->setIcon(QIcon::fromTheme(QStringLiteral("window-close")));
     QHBoxLayout *layout = new QHBoxLayout();
     layout->setSpacing(0);
     layout->addWidget(m_projectsCombo);
     layout->addWidget(m_reloadButton);
+    layout->addWidget(m_closeProjectButton);
     m_toolView->layout()->addItem(layout);
     m_toolView->layout()->setSpacing(0);
 
@@ -107,6 +111,9 @@ KateProjectPluginView::KateProjectPluginView(KateProjectPlugin *plugin, KTextEdi
     });
     connect(m_projectsCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &KateProjectPluginView::slotCurrentChanged);
     connect(m_reloadButton, &QToolButton::clicked, this, &KateProjectPluginView::slotProjectReload);
+    //---
+    connect(m_closeProjectButton, &QToolButton::clicked, this, &KateProjectPluginView::slotProjectClose);
+    //---
     connect(m_gitStatusRefreshButton, &QToolButton::clicked, this, [this] {
         if (auto widget = m_stackedgitViews->currentWidget()) {
             qobject_cast<GitWidget *>(widget)->getStatus();
@@ -555,6 +562,28 @@ void KateProjectPluginView::slotProjectReload()
     }
 }
 
+void KateProjectPluginView::slotProjectClose()
+{
+    
+    if (QWidget *current = m_stackedProjectViews->currentWidget())
+    {
+
+        m_project2View.erase(m_project2View.find(static_cast<KateProjectView *>(current)->project()));
+        m_stackedProjectViews->removeWidget(m_stackedProjectViews->currentWidget());
+        m_stackedProjectInfoViews->removeWidget(m_stackedProjectInfoViews->currentWidget());
+        m_stackedgitViews->removeWidget(m_stackedgitViews->currentWidget());
+        m_plugin->projects().removeAt(m_plugin->projects().indexOf(static_cast<KateProjectView *>(current)->project()));
+        
+        m_projectsCombo->removeItem(m_plugin->projects().indexOf(static_cast<KateProjectView *>(current)->project()));
+        m_projectsComboGit->removeItem(m_plugin->projects().indexOf(static_cast<KateProjectView *>(current)->project()));
+        
+        static_cast<KateProjectView *>(current)->project()->close(true);
+        //delete static_cast<KateProjectView *>(current)->project();
+        
+    }
+}
+
+
 QString KateProjectPluginView::currentWord() const
 {
     KTextEditor::View *kv = m_activeTextEditorView;

addons/project/kateprojectpluginview.h

@@ -148,6 +148,11 @@ private Q_SLOTS:
      * This will trigger a reload with force.
      */
     void slotProjectReload();
+    
+    /**
+     * Close current project, if any.
+     */
+    void slotProjectClose();
 
     /**
      * Lookup current word
@@ -272,6 +277,11 @@ private:
      * Reload button
      */
     QToolButton *m_reloadButton;
+    
+    /**
+     * Closeing button
+     */
+    QToolButton *m_closeProjectButton;
 
     /**
      * Git status refresh button